CA2103643A1 - Coupling and method for folding back a pipe end using for it and its apparatus - Google Patents
Coupling and method for folding back a pipe end using for it and its apparatusInfo
- Publication number
- CA2103643A1 CA2103643A1 CA002103643A CA2103643A CA2103643A1 CA 2103643 A1 CA2103643 A1 CA 2103643A1 CA 002103643 A CA002103643 A CA 002103643A CA 2103643 A CA2103643 A CA 2103643A CA 2103643 A1 CA2103643 A1 CA 2103643A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- opening end
- folding back
- guiding portion
- coupling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
- F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
- F16L19/0286—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall and being formed as a flange
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe
- F16L47/041—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe the plastic pipe end being flared either before or during the making of the connection
Abstract
ABSTRACT
The invention related to this application is:
a method for folding back an opening end of resin pipe comprising following processes, (a) a process for mounting an annular body to a circumference of a pipe, (b) a process for inserting a conically protruded portion of a guiding portion including said conically protruded portion and a curved surface groove formed around this circumference to an opening end of the pipe and simultaneously advancing with rotating the guiding portion, and (c) a process for continuing the advancement with rotating said guiding portion whereby folding back the opening end of the pipe, and inserting the folded back pipe opening end to the circumference of said annular body; and an apparatus for folding back an opening end of resin pipe comprising a clamping means for holding the pipe and a bending means, and said clamping means including a tightening mechanism for pushing the pipe to radial direction, and said bending means including a guiding portion for advancing by rotating with abutting to the pipe opening end, a rotational driving mechanism for rotating the guiding portion, and a reciprocating mechanism for advancing/retreating the guiding portion toward the pipe axis direction, so as to make the pipe opening end to be outwardly expanded and simultaneously folded back to axial direction.
The invention related to this application is:
a method for folding back an opening end of resin pipe comprising following processes, (a) a process for mounting an annular body to a circumference of a pipe, (b) a process for inserting a conically protruded portion of a guiding portion including said conically protruded portion and a curved surface groove formed around this circumference to an opening end of the pipe and simultaneously advancing with rotating the guiding portion, and (c) a process for continuing the advancement with rotating said guiding portion whereby folding back the opening end of the pipe, and inserting the folded back pipe opening end to the circumference of said annular body; and an apparatus for folding back an opening end of resin pipe comprising a clamping means for holding the pipe and a bending means, and said clamping means including a tightening mechanism for pushing the pipe to radial direction, and said bending means including a guiding portion for advancing by rotating with abutting to the pipe opening end, a rotational driving mechanism for rotating the guiding portion, and a reciprocating mechanism for advancing/retreating the guiding portion toward the pipe axis direction, so as to make the pipe opening end to be outwardly expanded and simultaneously folded back to axial direction.
Description
~ t~ ~ fi,~
SPECIFI~ATION
~I~LE OF INVE~InN
5A coupling and ~,ethod ~or folding back a pipe end using for it and its apparatus 10The present invention relates to a coupling ~ade of synthetîc resin used for piping system transferrin~
poisonous fluid of hi~h temperature and high pressure in a Pield of so-called high technology such as mainly semiconductor production, and ~ethod for manufacturing a pipe used ~or this coupling and its manufac-turing apparatus.
As a coupling's mechanis~ of plastic pipe, various tight sealing structures using of a tight sealing taper screw and ferule and others are known.
20However, for instance, in fluoric resins such as TFE(polytetra~luoroethylene), PFA(copolymer of polytetrafluoroethylene and perfluoroalkylvinylether), FEP~copolymer of polytetrafluoropropylene) and the like, in accordance with their characteristlcs, poisonous materials and the like of high temperature and high pressure are manr in fluid used for that~ and a leahage of fluid are produced which occurs ~y causes '.
. , ~
, . , , . . , - .
'' ' '' . , : . . . :
.. .. . .
: . ' ' '' ' ~ '. '' ~ : .
' .' ' . ' '. - ' ~ ' . ' :' of repeating of expansion and contraction due to heat cycle and generation of creeping and the like.
This is because ~ainly fine gaps are produced ca~lsing fron~ above factors to a joinirlg portion, And a prevention fox this is verY difficult. ~herefore, in conv~ntional couplings and in those k:inds, a using in condition at belo~ about temperature of 120 degrees in Centigrade and pressure of 2K~/c of fluid is inevitably done.
In accordance with the coupling of the present invention, front end portion of resin pipe folded bac~s and ormed in U-shape is coupled to an inner annular portion of tightenin~ means, a folded portion of -the resin pipe positioned at concave portion of inner annular portion, îts U-shaped botto~ is closely contacted and fixed by an end edge of the inner annular portion and a curved groove of stopper portion according to the screw-coupling of the tightening ~eans and a coupling's main body, and a protruded strip band ~0 strengthens a close contaGt of couplin~'s maill ~odY
inner sur~ace and a concave outer circu~Eerential surface of resin pipe folded back portion and at the sa~e ti~le, a lip seal ~akes a close contacting degree oE inner surface of the coupling ~ain bGdy and an inner circu~ferential surface of the inner annular portion to be fir~ and secure, so that a coupling for a pipe of resin of very high in reliability esp~cially flu~rine ''' resin can be realized without producing any proble~ of leakage and the like even in allowable li~it range further above the te~perature condition and pressure condition of fluid in conventional coupling.
And yet, one which ~ay be citecl as a requisite condition for above described couplin~ is a structure which folded back a pipe opening end to outer side.
However~ to ~ake a front end of fluorine resin pipe and the like to be si~ply, exactly and rapidly folded back ~ith ~eeting to joining condition is very difficult.
Hereto~ore) although it ~ight have been thought that to fold back a front end of resin pipe toward outside at nor~al te~perature at-ld the like was i~possibleJ a technique Eor folding back an end portion lS of resin pipe was almost nothing.
Therefore, an inventor of this application has researched and developed a method for foldin~ back an end of opening of resin pipe and apparatus used for this folding back ~ethod co~prising a process or making an annular body to outer circu~ference of a pipe having a core ~aterial at inner hollow in compliance with require~ent, and a process for continuing to press the pipe opening end to axial direction of the pipe with expanding to out~ard, and with outwardly expandin~
~5 the front end by skillfully utilizin~ a characteristic~
particularly elasticity of the resin and simultaneously folding back the pipe opening end naturally at certain .
- : ' , '.
. ~
. . : . ' . -J ~
ti~e point, and inserting the pipe openin~ end folded back to outer circu~ference o aforesaid annular body, in a process of peripheral technigLle development of afore~entioned joining str~cture.
~UM~ARY OF THE XNVE~TIQN
The coupling in accordance with the present invention comprises a nut shaped tightening means having an outer annular portion and an inner annular portion, and a coupling's nain body which has a stopper portion at inner circumferential surface and si~ultaneously sorew-coupled ~etween said ou-ter annular portion of the tightening means and the inner annular portion, and holding by pressing a folded back portion of a resin pipe between the stopper portion and an end edge of said inner annular portion; and said tightening means for~ing a threaded portion at inner circumferential surface of the outer annular portion and at the same time providing a lip seal closely oontactin~ to inner surface of the coupling's nain bod~
around this concave portion end, and said coupling's main body forming a threaded portion sorew-coupling to the threadcd portion of said outer annular portion a-t the outer circumferential surface and on the other hand9. for~ing a taper portion gradually decreasing a diameter from the openin~ portion and a straight , ~ .
~,3t~ 3 portion continuing to this at inner circu~fe~ential sur~ace and simultaneously for~ing a groove portion at a portion abutting with ~olded back apex portion of the resill pipe in said stopper portion, and urther a protruded strip band for coupling ~ore fir~ly ~ith this by abutting to the folded back portion of the resin pipe is provided around the circu~ferential surface of said concave portion in the inner annular portion of nut.
The ~ethod ~or ~olding back a pipe openin~ end disclosed in this invention comprises:
~ a~ a process for ~ixing an annular body to outer circumference of pipe having a core material at inner hollow in ccmpliance with the requirement, ~b) a process ~or outwardly expanding the pipe opening end and simultaneously pressing to axial direction of the pipe, and (c) a process for folding back a pipe opening end ~ade oP material having an elasticit~ by c~ntinuing said pressing, and inserting the folded ~ack pipe opening end to the outer circuloference of sa:id annular body.
And, the apparatus used ~or aforementioned folding back ~ethod co~prises:
a clamping ~eans of pipe, a bending means, and a driving ~eans o~ these; and said cla~ping means includlng a oore materi~1 to be inserted into interior . : . , ' ~ . : , of the pipe in co~pliance with the requirement and a tightening ~echanis~ for pressing the pipe to radial direction, and said bending means for pressing the opening end of the pipe to axial direction of the pipe by the driving means including a ~ain body portion, and a guiding portion for folding back the pipe opening end with outwardly expandi.ng to axial direction accompanying with a pressing action toward the pipe axis direction of the ~ain body portion with contacting to entire circumference of the pipe opening end. And~
in this apparatus, said guidin~ portion includes a conically protruded portion and a curved surface groove formed around this, and -further it is characteriæed by co~prising a position determining means ~or deter~ining each correlative position of folded portion in the core material and the annular body and the pipe.
Moreover, in this invention, ~ollowing method for folding back a pipe opening end is also disclosed.
A method ~or folding back an opening end of resin pipe co~prising processes of :
(A) a process for inserting the conically protruded portion of the guiding portion provided with the conically protruded portion and a curved surface groove for~ed around this and simultaneously advancing with rotating the ~uiding portion, and (B) a process for folding back the pipe opening end by continuing the advancement and rotation of sald J 3 ~
guiding portion, and a ~ethod for foldin~ back an openin~ end of resin pipe comprising: :
~ C) a pro~ess Por fixing an annular body to a circu~ference of the pipe, (D) a process for inserting said conically protruded portion of a guiding portion provided ~ith the conically protruded portion and a curved surface groove formed with this and si~ultaneously advanoing with rotating the guiding portion, and (E~ a process Eor folding back the pipe opening end by cont.inuing the advancing with rotating o~ said guiding portion, and inserting the pipe opening end folded back to a circu~erence o~ said annular body.
And, the apparatus used for this folding back ~ethod co~prises a cla~ping ~eans ~or supporting the pipe and a bending means~ and saià cla~ping ~eans includes a tightening mechanis~ for pressing the pipe to radial direction, and said bending means includes a guiding portion ~or advancing with rotating by abutting to the pipe opening end, a rotational driving mechanism for rotating the guiding portion, and a reciprocating ~ecbanis~ for advancing and retreating the guiding portion to a pipe axis direction, and it is ~5 characterized in -that it is made to fold ~ack the pipe opening end to axial direction with outwardly expandlng i-. And in this apparatus, said guidin~ portlon l~ay .
~e provided with a conically protruded portion alld curved surfaGe groove for~ed around this.
~.IEE D~SCRIPTIQN OF T~E DRAWIN~S
FIG.1 i5 a cro~s sectional view showing a ~'irst embodi~ent in,accordance with clai~ 1 and claim 2 o~
the invention, FIG.2 is a ~agnified vi.ew of an end surface of cut . ' lO portion o~ a tightening ~eans in FIG.1, ,'' FIG.3 is a ~agni~ied view o~ an end sur~a~e o~ cut portion of a coupling's ~ain body'in FIG.1~
FIG.4 is cross sectional view showing a second e~bodlment of the invention in accordance with clailn 1 to 2, FIG.S is a side view showing an e~bodi~ent in accordance ~ith clai~ 5, FIG.6 is a cross sectional view showing a relation of position o~ annular bocly and the pipe in clai~ 3, FIG.7 is a cross sectional view showing an action of position deter~ining ~eans(inserting means) in clai~
7, FIG.8 is a cross sectional view showing an operation of a'bending means in claim 5, : ,25 FIG.9 is a cross sectional view showing an operat,ion of a bendin~ ~eans in clai~ 5, FIG.lQ is a cross sectional view showing an -- ~ _ .. . . .
. .: . , : . , :
.:
~ c3 operation Oe a bending means in clai~ 5, FIG.11 is a cross sectional view showing another embodi~ent o~ annular body in clai~ 5, FIG.12 and FIG.13 are a cross sectional views respectively showing a case folded bacls the opening end of the pipe. without annular body, FIG.14 is a cross sectional view showing another embodi~enk of the bending means, FIG.15 is a side cross sectional view showing a ~irst e~bodiment of claim 10, FIG.16 is a side cross sectional view showing a second embodiment o~` claim 10, FIG.17 and FIG.18(A),(B) are diagra~s showing exa~ples o~ ~olding back process of the pipe opening end in accordance with claim 8 or clai~ 9.
5~ b~RIe~ T~ Y~E~m ~
The enbodiments o~ the present invention will be described in more detail with reference to the acco~panying drawings. FIG.l to FIG.3 are diagrams showing a ~irst e~bodilrlent of the invention in accordance ~ith clai~ 1 to clai~ 2.
In the drawings, a re~erence nu~eral symbol 1 is a ~5 cap-like nut or bag-like nut as a tightening means made of ~luoric resin ~or~ing a cylindrical shape having an outer annular portion la and an inner annular portion .: ' - .
.. . .
.
.. . .. . . . . . .
.
~ ' ' " "' " ' ~" " ' ' ' .
~ ~J~3$-~
lb, and a threaded portion lc is for~ed to an inner circu~ferential surface of the outer annular portion.
A reference numeral symbol 2 is a coupling's ~ain body m~d~ of ~luoric resin for~ing a cylindrical shape coupling in screwing ~anner to the tightening ~eans, and which has a t.aper portion 2a gradually deereasing in diameter from the openin~ portion and a straight portion 2b continuing to this in the inner surface, and formed with a stopper portion 7 at adjacent of ter~inal end o~ this straight portion 2b and on the other hand, a thrèaded portion 2c to be screw-coupled with said threaded portion lc is for~ed at the outer surface. A
re~erence nu~eral sy~bol 4 is a fluoric resin pipe, and a U-shaped folded hack portion 4a is formed at its ~ront endJ and an apex portion 4b of the folded back portion 4a is inserted tc a hereinafter described curved surface groove 7a in the coupling's main body ~.
Further, a reference numeral sy~bol 3 is a pu~p fixed by screw-coupling the coupling's ~ain bodY 2.
20FIG.3 is a magnified view of an end surface of cut portion of the coupling's Inain ~ody 2, and as sho~n in the drawings, a curved surface groove 7a is ~ormed at bottom of the stopper portion 7 and which is made to be coupled with said apex portion 4~.
25Next, asse~bling sequence o~ the coupling in accordanGe with this em~odi~ent will be described hereinafter. Firstly, the fluoric resin pipe 4 folded - lU -.
~.'' i J ~
back in U-shape with front end is passed to the tightening ~eans 1, and the apex portion 4~ of the ~olded back portion ~la of the 2iPe 4 is insçrted to the curved surface groove 7a in the coupling s main body 2.
Successively, a nut 1 is scre~-coupled to the coupling's main body 2. The nut 1 descends down in response to the advance~ent of the screw-col}pling, but since a lip seal 5 protruded a little to sideward is Eortned with a taper portion 2a, and it descends gradually without being caught to the inner surface o~
the coupling's ~ain body.
On the other hand, as the descending of the tightening ~eans 1, the inner annular portion lb advances to a gap o~ the U-shaped folded back portion o~ the pipe 4, and completely cuts off a leakage of ~luid fro~ interior of the pipe 4.
The folded back portion 4a o~ the pipe 4 is positioned at a concave portion 8 o~ the inner annular portion lb, and the ~olded back portion 4a is fir~ly 2~ contacted to wall surface of the concave portion 8 and the inner sur~ace o~ the coupling's ~a~n bodY 2. And, said lip seal 5 is also ~ir~l~ contacted to the inncr circu~ferential sur~ace o~ the coupling's ~ain body 2J
and ~.he leakage to an outside o~ this coupling becomes co~pletely prevented even iE supposing that there would be any leakage between the apex portion 4h and the curved sur~ace groova 7a.
, . :. . .
. . .
.
Moreover, the ~olding back of fron-t end of the fluoric resin pipe 4 is done by using an exclusive usin~ tool, but in case that thiclsness of the pipe is large, c>r i~ Gil:ie that the folding ba~}. i5 cli-E:Ficul~ a:~:
in ~ultiple layer pipe which is ~or~ed ~ith PFA in the inner side and PE in the outer side or a suspended bridge polyethylene in the inner sicle and a eo~mon polyethylene in the outer side~ the ~olding back is readily possible when ~or~ing two layers or a plurality layer3 by making deep Cll~ notches(not sho~n~ o:f circu~erenti~l shape to ~ront end surface.
FIG.4 is a diagra~ showin~ a second embodi~ent o~
this invention in accordance with clai~ 1 to 2 In this embodiment, the front end portion of the pipe 4 is folded back in a state to roll up to outside as shown in the ~ra~ing. ~ndJ this circularly shaped Po'lded ba~k portion is made to be held by pressin~ b~
an end portion o~ the inner annular porti~n lb and the apex portion ~b. '~he other structures are sam~ ~5 a~orementioned embodi~ent.
The present invention, by the construction and op~ration as de~cribed ~boveJ can completely prevent a leakage by a creeping pheno~enon which is a great shortco~ing included uith conventional resin couplin~
~S and further a connection o~ the ~'luoric resin pipe which has not been found out in si~ple and effective joining means hereto~'ore can be ver~ si~ply exec~l-ted.
.' ~ ' ' :
1~ ~ S~ LA?L ~
FIG.5 is a cliagram shc,wing a struct.ure c,P the folding back apparatus in accordance ~i.th claim 5 and ~. In the drawin~, a reference nunJera.l symbol 21 is a hending means, and a reference numeral s~bol 22 is a driving source for pressing the bencling means 21 to axial direction of the resin pipe ~6 through a reciprocating piston rod 2~a. The bendin~ neans 21 consists of a cylindrically shaped ~ain body 21a and a guiclin~ portion provided at bottom side q~ this as shown in FIG.8, and this guiding portion consists of a conically protrucled portion 21h formed at cel1ter of s~id hottom surface ancl a curved sur:eace groove ~lc aro~nd this cir~umference. A diameter of circular apex portion of the conically protr-lded portion Zlb is nade slightlY smaller than a diameter o~ the pipe 2G, and a side surface of the conically protruded portion 21b and t.he curved sorface groove 21c Eorm a continuous surface, and an openlng end of the pipe ~6 is outwardly expanded as being ~uided to aforementioned continuous surface as described hereinaPter and simultaneously, at a time point that an angle for an axial direction of the pipe of a portion becoming outwardly expanding has 'c)eGome biggerJ a phenomenon bec:omes produced in which it is left from surface of the curved surface groove 2~ 21c by an elasticity of pipe ~ formin~ resin and just as a contraction i.s started to radial direction and naturally folded back. Further, a connection o~ main - . : : ~ , - , . ., , ~ , - : . : :: : .
. ~ . . . ..
SPECIFI~ATION
~I~LE OF INVE~InN
5A coupling and ~,ethod ~or folding back a pipe end using for it and its apparatus 10The present invention relates to a coupling ~ade of synthetîc resin used for piping system transferrin~
poisonous fluid of hi~h temperature and high pressure in a Pield of so-called high technology such as mainly semiconductor production, and ~ethod for manufacturing a pipe used ~or this coupling and its manufac-turing apparatus.
As a coupling's mechanis~ of plastic pipe, various tight sealing structures using of a tight sealing taper screw and ferule and others are known.
20However, for instance, in fluoric resins such as TFE(polytetra~luoroethylene), PFA(copolymer of polytetrafluoroethylene and perfluoroalkylvinylether), FEP~copolymer of polytetrafluoropropylene) and the like, in accordance with their characteristlcs, poisonous materials and the like of high temperature and high pressure are manr in fluid used for that~ and a leahage of fluid are produced which occurs ~y causes '.
. , ~
, . , , . . , - .
'' ' '' . , : . . . :
.. .. . .
: . ' ' '' ' ~ '. '' ~ : .
' .' ' . ' '. - ' ~ ' . ' :' of repeating of expansion and contraction due to heat cycle and generation of creeping and the like.
This is because ~ainly fine gaps are produced ca~lsing fron~ above factors to a joinirlg portion, And a prevention fox this is verY difficult. ~herefore, in conv~ntional couplings and in those k:inds, a using in condition at belo~ about temperature of 120 degrees in Centigrade and pressure of 2K~/c of fluid is inevitably done.
In accordance with the coupling of the present invention, front end portion of resin pipe folded bac~s and ormed in U-shape is coupled to an inner annular portion of tightenin~ means, a folded portion of -the resin pipe positioned at concave portion of inner annular portion, îts U-shaped botto~ is closely contacted and fixed by an end edge of the inner annular portion and a curved groove of stopper portion according to the screw-coupling of the tightening ~eans and a coupling's main body, and a protruded strip band ~0 strengthens a close contaGt of couplin~'s maill ~odY
inner sur~ace and a concave outer circu~Eerential surface of resin pipe folded back portion and at the sa~e ti~le, a lip seal ~akes a close contacting degree oE inner surface of the coupling ~ain bGdy and an inner circu~ferential surface of the inner annular portion to be fir~ and secure, so that a coupling for a pipe of resin of very high in reliability esp~cially flu~rine ''' resin can be realized without producing any proble~ of leakage and the like even in allowable li~it range further above the te~perature condition and pressure condition of fluid in conventional coupling.
And yet, one which ~ay be citecl as a requisite condition for above described couplin~ is a structure which folded back a pipe opening end to outer side.
However~ to ~ake a front end of fluorine resin pipe and the like to be si~ply, exactly and rapidly folded back ~ith ~eeting to joining condition is very difficult.
Hereto~ore) although it ~ight have been thought that to fold back a front end of resin pipe toward outside at nor~al te~perature at-ld the like was i~possibleJ a technique Eor folding back an end portion lS of resin pipe was almost nothing.
Therefore, an inventor of this application has researched and developed a method for foldin~ back an end of opening of resin pipe and apparatus used for this folding back ~ethod co~prising a process or making an annular body to outer circu~ference of a pipe having a core ~aterial at inner hollow in compliance with require~ent, and a process for continuing to press the pipe opening end to axial direction of the pipe with expanding to out~ard, and with outwardly expandin~
~5 the front end by skillfully utilizin~ a characteristic~
particularly elasticity of the resin and simultaneously folding back the pipe opening end naturally at certain .
- : ' , '.
. ~
. . : . ' . -J ~
ti~e point, and inserting the pipe openin~ end folded back to outer circu~ference o aforesaid annular body, in a process of peripheral technigLle development of afore~entioned joining str~cture.
~UM~ARY OF THE XNVE~TIQN
The coupling in accordance with the present invention comprises a nut shaped tightening means having an outer annular portion and an inner annular portion, and a coupling's nain body which has a stopper portion at inner circumferential surface and si~ultaneously sorew-coupled ~etween said ou-ter annular portion of the tightening means and the inner annular portion, and holding by pressing a folded back portion of a resin pipe between the stopper portion and an end edge of said inner annular portion; and said tightening means for~ing a threaded portion at inner circumferential surface of the outer annular portion and at the same time providing a lip seal closely oontactin~ to inner surface of the coupling's nain bod~
around this concave portion end, and said coupling's main body forming a threaded portion sorew-coupling to the threadcd portion of said outer annular portion a-t the outer circumferential surface and on the other hand9. for~ing a taper portion gradually decreasing a diameter from the openin~ portion and a straight , ~ .
~,3t~ 3 portion continuing to this at inner circu~fe~ential sur~ace and simultaneously for~ing a groove portion at a portion abutting with ~olded back apex portion of the resill pipe in said stopper portion, and urther a protruded strip band for coupling ~ore fir~ly ~ith this by abutting to the folded back portion of the resin pipe is provided around the circu~ferential surface of said concave portion in the inner annular portion of nut.
The ~ethod ~or ~olding back a pipe openin~ end disclosed in this invention comprises:
~ a~ a process for ~ixing an annular body to outer circumference of pipe having a core material at inner hollow in ccmpliance with the requirement, ~b) a process ~or outwardly expanding the pipe opening end and simultaneously pressing to axial direction of the pipe, and (c) a process for folding back a pipe opening end ~ade oP material having an elasticit~ by c~ntinuing said pressing, and inserting the folded ~ack pipe opening end to the outer circuloference of sa:id annular body.
And, the apparatus used ~or aforementioned folding back ~ethod co~prises:
a clamping ~eans of pipe, a bending means, and a driving ~eans o~ these; and said cla~ping means includlng a oore materi~1 to be inserted into interior . : . , ' ~ . : , of the pipe in co~pliance with the requirement and a tightening ~echanis~ for pressing the pipe to radial direction, and said bending means for pressing the opening end of the pipe to axial direction of the pipe by the driving means including a ~ain body portion, and a guiding portion for folding back the pipe opening end with outwardly expandi.ng to axial direction accompanying with a pressing action toward the pipe axis direction of the ~ain body portion with contacting to entire circumference of the pipe opening end. And~
in this apparatus, said guidin~ portion includes a conically protruded portion and a curved surface groove formed around this, and -further it is characteriæed by co~prising a position determining means ~or deter~ining each correlative position of folded portion in the core material and the annular body and the pipe.
Moreover, in this invention, ~ollowing method for folding back a pipe opening end is also disclosed.
A method ~or folding back an opening end of resin pipe co~prising processes of :
(A) a process for inserting the conically protruded portion of the guiding portion provided with the conically protruded portion and a curved surface groove for~ed around this and simultaneously advancing with rotating the ~uiding portion, and (B) a process for folding back the pipe opening end by continuing the advancement and rotation of sald J 3 ~
guiding portion, and a ~ethod for foldin~ back an openin~ end of resin pipe comprising: :
~ C) a pro~ess Por fixing an annular body to a circu~ference of the pipe, (D) a process for inserting said conically protruded portion of a guiding portion provided ~ith the conically protruded portion and a curved surface groove formed with this and si~ultaneously advanoing with rotating the guiding portion, and (E~ a process Eor folding back the pipe opening end by cont.inuing the advancing with rotating o~ said guiding portion, and inserting the pipe opening end folded back to a circu~erence o~ said annular body.
And, the apparatus used for this folding back ~ethod co~prises a cla~ping ~eans ~or supporting the pipe and a bending means~ and saià cla~ping ~eans includes a tightening mechanis~ for pressing the pipe to radial direction, and said bending means includes a guiding portion ~or advancing with rotating by abutting to the pipe opening end, a rotational driving mechanism for rotating the guiding portion, and a reciprocating ~ecbanis~ for advancing and retreating the guiding portion to a pipe axis direction, and it is ~5 characterized in -that it is made to fold ~ack the pipe opening end to axial direction with outwardly expandlng i-. And in this apparatus, said guidin~ portlon l~ay .
~e provided with a conically protruded portion alld curved surfaGe groove for~ed around this.
~.IEE D~SCRIPTIQN OF T~E DRAWIN~S
FIG.1 i5 a cro~s sectional view showing a ~'irst embodi~ent in,accordance with clai~ 1 and claim 2 o~
the invention, FIG.2 is a ~agnified vi.ew of an end surface of cut . ' lO portion o~ a tightening ~eans in FIG.1, ,'' FIG.3 is a ~agni~ied view o~ an end sur~a~e o~ cut portion of a coupling's ~ain body'in FIG.1~
FIG.4 is cross sectional view showing a second e~bodlment of the invention in accordance with clailn 1 to 2, FIG.S is a side view showing an e~bodi~ent in accordance ~ith clai~ 5, FIG.6 is a cross sectional view showing a relation of position o~ annular bocly and the pipe in clai~ 3, FIG.7 is a cross sectional view showing an action of position deter~ining ~eans(inserting means) in clai~
7, FIG.8 is a cross sectional view showing an operation of a'bending means in claim 5, : ,25 FIG.9 is a cross sectional view showing an operat,ion of a bendin~ ~eans in clai~ 5, FIG.lQ is a cross sectional view showing an -- ~ _ .. . . .
. .: . , : . , :
.:
~ c3 operation Oe a bending means in clai~ 5, FIG.11 is a cross sectional view showing another embodi~ent o~ annular body in clai~ 5, FIG.12 and FIG.13 are a cross sectional views respectively showing a case folded bacls the opening end of the pipe. without annular body, FIG.14 is a cross sectional view showing another embodi~enk of the bending means, FIG.15 is a side cross sectional view showing a ~irst e~bodiment of claim 10, FIG.16 is a side cross sectional view showing a second embodiment o~` claim 10, FIG.17 and FIG.18(A),(B) are diagra~s showing exa~ples o~ ~olding back process of the pipe opening end in accordance with claim 8 or clai~ 9.
5~ b~RIe~ T~ Y~E~m ~
The enbodiments o~ the present invention will be described in more detail with reference to the acco~panying drawings. FIG.l to FIG.3 are diagrams showing a ~irst e~bodilrlent of the invention in accordance ~ith clai~ 1 to clai~ 2.
In the drawings, a re~erence nu~eral symbol 1 is a ~5 cap-like nut or bag-like nut as a tightening means made of ~luoric resin ~or~ing a cylindrical shape having an outer annular portion la and an inner annular portion .: ' - .
.. . .
.
.. . .. . . . . . .
.
~ ' ' " "' " ' ~" " ' ' ' .
~ ~J~3$-~
lb, and a threaded portion lc is for~ed to an inner circu~ferential surface of the outer annular portion.
A reference numeral symbol 2 is a coupling's ~ain body m~d~ of ~luoric resin for~ing a cylindrical shape coupling in screwing ~anner to the tightening ~eans, and which has a t.aper portion 2a gradually deereasing in diameter from the openin~ portion and a straight portion 2b continuing to this in the inner surface, and formed with a stopper portion 7 at adjacent of ter~inal end o~ this straight portion 2b and on the other hand, a thrèaded portion 2c to be screw-coupled with said threaded portion lc is for~ed at the outer surface. A
re~erence nu~eral sy~bol 4 is a fluoric resin pipe, and a U-shaped folded hack portion 4a is formed at its ~ront endJ and an apex portion 4b of the folded back portion 4a is inserted tc a hereinafter described curved surface groove 7a in the coupling's main body ~.
Further, a reference numeral sy~bol 3 is a pu~p fixed by screw-coupling the coupling's ~ain bodY 2.
20FIG.3 is a magnified view of an end surface of cut portion of the coupling's Inain ~ody 2, and as sho~n in the drawings, a curved surface groove 7a is ~ormed at bottom of the stopper portion 7 and which is made to be coupled with said apex portion 4~.
25Next, asse~bling sequence o~ the coupling in accordanGe with this em~odi~ent will be described hereinafter. Firstly, the fluoric resin pipe 4 folded - lU -.
~.'' i J ~
back in U-shape with front end is passed to the tightening ~eans 1, and the apex portion 4~ of the ~olded back portion ~la of the 2iPe 4 is insçrted to the curved surface groove 7a in the coupling s main body 2.
Successively, a nut 1 is scre~-coupled to the coupling's main body 2. The nut 1 descends down in response to the advance~ent of the screw-col}pling, but since a lip seal 5 protruded a little to sideward is Eortned with a taper portion 2a, and it descends gradually without being caught to the inner surface o~
the coupling's ~ain body.
On the other hand, as the descending of the tightening ~eans 1, the inner annular portion lb advances to a gap o~ the U-shaped folded back portion o~ the pipe 4, and completely cuts off a leakage of ~luid fro~ interior of the pipe 4.
The folded back portion 4a o~ the pipe 4 is positioned at a concave portion 8 o~ the inner annular portion lb, and the ~olded back portion 4a is fir~ly 2~ contacted to wall surface of the concave portion 8 and the inner sur~ace o~ the coupling's ~a~n bodY 2. And, said lip seal 5 is also ~ir~l~ contacted to the inncr circu~ferential sur~ace o~ the coupling's ~ain body 2J
and ~.he leakage to an outside o~ this coupling becomes co~pletely prevented even iE supposing that there would be any leakage between the apex portion 4h and the curved sur~ace groova 7a.
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Moreover, the ~olding back of fron-t end of the fluoric resin pipe 4 is done by using an exclusive usin~ tool, but in case that thiclsness of the pipe is large, c>r i~ Gil:ie that the folding ba~}. i5 cli-E:Ficul~ a:~:
in ~ultiple layer pipe which is ~or~ed ~ith PFA in the inner side and PE in the outer side or a suspended bridge polyethylene in the inner sicle and a eo~mon polyethylene in the outer side~ the ~olding back is readily possible when ~or~ing two layers or a plurality layer3 by making deep Cll~ notches(not sho~n~ o:f circu~erenti~l shape to ~ront end surface.
FIG.4 is a diagra~ showin~ a second embodi~ent o~
this invention in accordance with clai~ 1 to 2 In this embodiment, the front end portion of the pipe 4 is folded back in a state to roll up to outside as shown in the ~ra~ing. ~ndJ this circularly shaped Po'lded ba~k portion is made to be held by pressin~ b~
an end portion o~ the inner annular porti~n lb and the apex portion ~b. '~he other structures are sam~ ~5 a~orementioned embodi~ent.
The present invention, by the construction and op~ration as de~cribed ~boveJ can completely prevent a leakage by a creeping pheno~enon which is a great shortco~ing included uith conventional resin couplin~
~S and further a connection o~ the ~'luoric resin pipe which has not been found out in si~ple and effective joining means hereto~'ore can be ver~ si~ply exec~l-ted.
.' ~ ' ' :
1~ ~ S~ LA?L ~
FIG.5 is a cliagram shc,wing a struct.ure c,P the folding back apparatus in accordance ~i.th claim 5 and ~. In the drawin~, a reference nunJera.l symbol 21 is a hending means, and a reference numeral s~bol 22 is a driving source for pressing the bencling means 21 to axial direction of the resin pipe ~6 through a reciprocating piston rod 2~a. The bendin~ neans 21 consists of a cylindrically shaped ~ain body 21a and a guiclin~ portion provided at bottom side q~ this as shown in FIG.8, and this guiding portion consists of a conically protrucled portion 21h formed at cel1ter of s~id hottom surface ancl a curved sur:eace groove ~lc aro~nd this cir~umference. A diameter of circular apex portion of the conically protr-lded portion Zlb is nade slightlY smaller than a diameter o~ the pipe 2G, and a side surface of the conically protruded portion 21b and t.he curved sorface groove 21c Eorm a continuous surface, and an openlng end of the pipe ~6 is outwardly expanded as being ~uided to aforementioned continuous surface as described hereinaPter and simultaneously, at a time point that an angle for an axial direction of the pipe of a portion becoming outwardly expanding has 'c)eGome biggerJ a phenomenon bec:omes produced in which it is left from surface of the curved surface groove 2~ 21c by an elasticity of pipe ~ formin~ resin and just as a contraction i.s started to radial direction and naturally folded back. Further, a connection o~ main - . : : ~ , - , . ., , ~ , - : . : :: : .
. ~ . . . ..
3 ~
body portion 21a of the bending ~eans 21 and the piston rod 22a is done by a sorew-coupling ~eans. Moreover, the resin pipe 26 made of materials of large in elasticity memory such as polytetrafluoroethylene) copolymer with perfluoroalkylvinylether(PFA)J for exa~ple, polyethylene(P~ polyprop~rene(PE?, polybuten~PB)J polyamide(PA) and the like, is most suitable for applying this invention.
The driving source 22 is a solenoid, an air cYlinder and other well known article. A re~`erence numeral sy~hol 23 is a core material inserted to a predeter~ined Position within the pipe 26, and a reference numeral symbol 24 is a ti~htenin~ mechanis for fixing the pipe 26 to a predeter~ined position, and a clamping means is made by these core material ~3 and the tightening mechanis~ 24.
And, a reference numeral sy~bol 25 is an annular body to be inserted to circu~ferential surface of the pipe 26.
~0 Mext, the foldin~ back method of the op~ning end of the resin pipe 26 together with an operation of the apparatus based on the above-described construction will be described with reference to FIG.6 and 7. As shown in FIG.6, ~irstly the annular body 15 is inserted to front end of the pipe 26. Since a settle~ent of this depth a needs a time. an insertin~ means 27 shown in FIG.7 was used. This inserting ~eans 27 having a ' ' ' ' :- ' 2 ~ Y~, 3 .~ ~ 3 function as a position de-termining means consists of a cylindrical portion 27a having an inner diameter sa~e as an outer dia~eter of the pipe 2~ a connecting portion 27b standin~ within this cylind~ical porti~n 27a, and ~ rotating bar 27c. Further, materials such as sa~e material as the pipe, or ~etal or h~rd plastic may be used for the annular body ~5.
The height of side wall of the cylindrical portion 27a is ~ade to be same as afore3nentioned depth ~, and the connectin~ portion 27b and the. eore material 23 are serew-coupled. Accordingly, after inserti.ng the annular bodY 25 to the pipe 26, when the cylindrical portion 27a i5 pushed Up until the front end oE the pipe 26 abuts to bottom of the cylindrical portion 27a with rotating the rotating bar 27c by inserting the core material 23 screw-coupled to the ccnnecting portion 27b to the opening portion of the pipe 26, the core material 23 and the annular body 25 are respeetively set up to a predeternined position, and simultaneously a foldin~ baok amount ~ becomes to be set at the front end of the pipe 26 as well. After these work, when the rotating bar 27c is reversely rotatecl) t.he screw-coupling of the core ~aterial 23 with the connecting body ~7b i5 released and the inserting ~eans 27 becomes left away from the pipe ~6.
FIG.8 to FIG.10 are diagrams showing the folding baek process of the front end of the piPe.
- lS -. : . - - , . :
. ..
- , .
.~
.
~ 3~
As shown in FIG.8, the pipe 26 is Eirmly held by the t.ightening mechanism 24. At this moment, since the core ~aterial 23 is inserted illtO the pipe 26, a de~or~ation and the like of the pipe 26 will not he occurred. And, the bendin~ ~eans 21 is abutted to the opening end o~ the pipe 26 by operatin~ the driving source 22 and at the same ti~e pushed to axial direction. Further, since the use of core ~aterial is for preventing its defor~ation at a ~oment of holding the pipe 26, it is used in a case of thin in thickness of the pipe and the like, and the core material is not necessaril~ required in case when the thickness of the pipe is relatively thick, or in case when engraved notches are formed to the holding portion of the pipe ~hereby a gripping ability is raised.
The conically protruded portion 21b advances also by outwardly expanding the opening end of the pipe 26 along with the advance~ent of the bending ~echanism ~1.
To this end~ the opening end of the pipe 26 ~loves alongside the side surace of the conically protruded portion 21b. And, the opening encl o~ the pipe 26 reaches the curved surface groove 21c by a fur-ther advancement oE the main body portion 21a of the bending means 21. SinGe this curved surfaGe groove ~1c is ~ormed with approxl~atel~ U-shape in cross section, the front end portion oE the pipe ~6 passes a botto~
: portion of U~shape by acco~panying with the further .
' aclvance~le.nt ,~ t.he main bcldy 21a, ancl becc,mes tc be folded back with char-lging the direction. (re~er to FIG.9) And, when the opelling end of the pip~ 26 i~
co~pletely folded back alon~side the annular body ~5~
the advancemellt o~ the bendill~ means ~ stopped, and successively moved back to reverse direction different from the direction up to now. (re~er to FIG.10) And, after screw-coupling the core ~naterial 23 within the ln pipe 26 by using the a~ore~lerltionecl inserting meallci 27J
it is pulled out to outside of the pipe 26, and the work is finished. Further, the height o~ the ~olded back portion is macle to be lower in compliance with the re~uirement, and it ~ay he used so as not.~ to cover the annular body 25.
FI~.11 is a diagram showing another e~lbodiment o~A
the a~orementioned annular ~ody. In this e~bodi~nent, the annular ~od~ 51 and the nut N are inte~rally ~ormed.
FIG.12 and FIG.13 show a case that the opening end is ~olded back without ~ixing the anrlular body 25 to the pipe, and a Elange portion is ~'ormecl to the pipe end.
FIG.14 is a dia~ram sho~ing a oase o ~'orn~ing a ; 25 ~lange portion to the~pipe end. In this embodi~nent, the bending .~eans 21 includes an annular convex strip portion 21d other than the main body portion ~1aJ the . .
- ' . ;' : ~ . ' .
,, ; ' ' ' '. ". ' . . ' :. ' , .
conically protruded portion 21b, an~ the curved sur~ace groove 21c. An inner dia~eter of this convex strip portion 21d is ~ad~ to be slightly bigger than an outer diamcter 01 tll~ rolded back portion o~ 1;he pipe 2~;
closely contacted to the curved surface groove 21c To this end, when a folding work of the pipe 26 is ~inished and the bending ~eans Z1 is retreated, a small sxpanded portion produced at the ~olded back portion of the pipe 26 receives a pressure of the convex strip portion 21d and then co~pensated J and the folded b~ck portion is closely contacted -to an out~r circu~ferential sur~ace of the annular body 25 in a s~ooth state The embodiment of the invention in accorclance with the above-described clai~ 3 to 7 can exactly and rapidl~ manufacture a resin pipe ~olcled back the ~ront opening end to outer circu~ferential surface side.
MoreoverJ in case o~ connectlng the conventional pipe by a coupling and the likè, a troubleso~e process to cut so as to nake the end sur~ace of the pipe to be a right angle in axial direction ~as required, but in accordance with the technique by this applicationJ
since an end surface of the opening portion of the folded back pipe ~orms a exact right angle a~ainst the axial direction, a conventional troubleso~e process as afore~entioned is not necessary.
FIG.15 is a diagra~ sho~ing a str~cture of the .
. 3 folding back apparatus in accordance with an em~odilllentof this clai~ ln. In accordance with this drawi.n~, it will be described by going abreast of the embodila~nts o~ the ~olding back ~rlethod 01 claim ~3 and the foldin~ back apparatus o~ clai~ 10.
In the drawings, a re~erence numeral sy~bol 31 i~
a ti.ghtening ~echanism for holding by pressing the resin pipe P in radial direction, and a reference nu~eral sy~bol 32 is a bending means, and which are ~ade of a guiding portion 33 for rotating by contacting to the opening end of the resin pipe P, a rotational driving mechanis~ A for rotating this guiding portion 33, a reciprocating ~echanis~ B for advanoing and retreating the afore~entioned guidin~ porti.on 33 to axial direction o~ the pipe P, and an enclosure body C
including these.
And, said guiding portion 33 includes a conically protruded portion 33b to be inserted to an opening portion of the pipe P and a curued surface groove 33a 20' whiGh is ~or~ed around this and its cross section is approximately U-shape.
And, the rotational drivin~ ~echanis~ A co~prises a rotary shaft 34 rotatably supporte,d to the enclosure body Cl a wide teeth gear 35 fixed to this rotary shaft .
25 4, a thin teeth gear 36 ~ixed to a ~otor so as to be "' ~eshed to thls wide teeth eear 35, and a ~otor 37 for rotating this gear 36 freely to right and left.
.
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In addition, the reciprocating mechanis~ Bcomprises an advancing/retreating shaft 38 in which a housing 39 rotatably coupling a flange portion ~or~ed a-t rear end Or ~aid rota~y ~ha~`t 3 is ~ d at. on~ end and having a rotating handle 311 at another end~ and a bearing portion 310 fixed ~et~een said ~lange portion .and bottom surface of the housing 39 within the housing 39~
A threaded portion is formed at an outer circu~erence of th~ advancing/retreating shaft 38, ~nd it is screw-coupled to a bearing Cl o~ the enclosure body C, and the advancing/retreati.n~ shaft 3a is made to be advanced and retreated in axial direction ln response to the rotation of the handle 311~ Further, a reference numeral symbol 313 is a bearing portion pro~ided to the bearing of said rotary shaft 34 and the enclosure body C~ In accordanee with the a~ore~entioned construction, an operation of -this e~bodi~ent will be described~
Firstly, a ring R is inserted to the outer cirGumference o~ the resin pipe P, and it is fixed to a predetermined position by the ti~htening mechanis~ 31~
The conically protruded portion 33a of the guiding portion 33 is inserted to the opening portion of the ~5 pipe P and at the sa~e ti~e, the opening end of the pipe P is contacted to the curved sur~ace groove 33b.
In this state, the rotarY shaEt 4 is rotated by the -- ~0 --,; . ' ; , ' :
.. ~ . . ................ .
... . . . . . . .
2 ~
~otor M and the guiding portion 33 is :rotated to either direction of right or left.
At this ~o~ent, the rotation of the rotary shaft 34 is trans~erred to the guiding porti~n 33, but i-t is S not transEerred to said advancin~/retreating shaft 38.
At a time point that the guiding portion 33 is abutted to the~ opening end o~ the pipe P and star-ted a sliding, the rotary sha~t 38 is advanced in a direction of arrow ~ bY rotating the advancing/retreatin~ sha~t 38 to a predeter~ined direction b~ the handle 3:ll. By the advancement of the advancing/ret:reating shaEt 38 toward arro~ ~, the housin~ oP the end portion of the advancing/retreatin~ shaft 38 pushes the rot~ry sha~'t 34 to arrow a direction through the bearin~ portion 15 310.
When the rotary shaft 34 is pushed, the wide teeth gear 35 moves to arrow A direction by re~oving the meshing portion of the gear 36 in axial direction.
Thus, when pushing it to p,ipe P by rotating the 2Q guiding portion 33, despite it is a very litkle Pressing power, the openin~ end of the pipe P is guided to the curved surface ~roove 33b of the guiding portiQn 33 and led to outside and eventually the : advancing/retreatin~ shaft 3~ is ~rloved t~ opposite direGtion of arrow ~, and the rotary shaft 34 coupling to the housing at its one end is also ~oved by following the retreat o~ the advancing~retreat~ng sha~t '.`; :'.
: .: ' . . . . . . . .
: ' : , .:
.. . .. . . . . .
3 ~
38, and the cylindriGal gea~ 35 and the ~ear 36 are nteshed and it is returned to original position.
By the way, in this method, a Inatter i.n which the pushing pressure to direction of pipe P of the guiding portion 33 is all right even if it is very s~lall, is as like as afore~entioned, but a result tested by co~paring this to the technique disclosed in clai~n 3 to claim 7 is as follows.
That is, in case where an opening end of PFA pipe of 1~.5 mm in outer diameter, 9.5 snrn in inner diameter, and l.S mm in thickness is folded back and formed to 7 mm in length o~ the fold.ed back porti.on and 4 m~n in thickness o~ the Poldecl back apex portion, the pushing pressure required for the advancement of the guiding portion was approximately 230 Kg.
In contrast with this, in this embodiment) a folding back of same condition with aforesnentioned uas made by a pushing pressure of approximately 5~ Kg in presumption.
~IG.16 is a diagram showing an embocliment of the ~'olding back apparatus in accorclance with claim l:L. In an apparatus related to this embodiment, different fro~
a~orementioned embodimentJ the rotational driving mechanism rotating the guiding portion and the reciprocating mechanism -Eor advancing and retreating the guiding portion are integrally struct~red. That is, in the drawin~s, a reference nu~eral symbol 31 is a ~ - 22 - .
,, . . , ., . , : .
. - ~ , . . ~
.. . . .
~ . - . ' .
tightening mechanis~ for holding by pushing the resin pi.pe P in radial direction, a reference nu~eral symbol 32 is a bending means, and which consists of a guiding portion 33 ~or ~ontacting to thc opening end o~ the resin pipe P and rotating thereof J a rotational driving n~echanis~ for rotating this guiding portion 33, and a reciprocating mechanism ~or advancing/retreating said guiding portion 33 to axial direction of the pipe, and these rotational drivi.ng ~echanisln and the reciprocating ~echanism co~prise a rotary pressing sha~t 313 and a bearing 313a for bearing this by screw-coupli.ng to the thread of this rotary pressing shaft 313, and a handle 311 fixed to ter~ninal end portion of the rotary pressing shaft 313, and the rotary pressing shaft 313 advances to or retreats fro~
~he pipe P by doing ~ helical movement by the rotation of the handle 311, and accordingly the guiding portion 33 fixed to front end of this rotary pressing shaft 313 becomes also advances to or retreats Erom the opening end of the pipe P wi.-th rotatin~.
Further, the guiding portion 33 as in aforesaid e~bodi~ent includes a conically protruded portion to be inserted to the opening end of the pipe P and a curved surface groove 33b of approximately U-shape in cross ~5 section and for~ed around this.
Qperation of this embodiment will be described in accordance with the afore~entioned structure.
- ~3 -,, ' ' '" .. ' ` '~ . : ' ', ' , ,- :. . , -: ,. . ... ., . : , . ~ .
, , , : :
, ~
~'t ~
Firstly, a ring R is inserted to the outer circu~ference of the resin pipe P, and fixed to a predetermined position by a tightening ~echanisrn 31, and the rotary ~ressin~ sh~t 31~ i~ advanoed to a direction of the pipe P by rotating the handle 311 where~y the conically protruded portion 33a of the guiding po~tion 33 is inserted to the opening portion of the pipe P and at the sa~e ti~e, the opening end of the pipe P is contacted to the curved sur~ace ~roove 33b.
At a time point that the ~uiding portion 33 has started a sliding move~ent by abuttin~ to the opening end of the pipe P, when the handle 311 is further rotated, the rotary pressing shaft 313 adYances to the direction o~ the pipe P by doing a helic~l ~ovement, and acco~panying with this, the guiding portion 33 is also rotated and presses this with contactin~ by sliding to the opening end of the pipe P.
Thus, when the guiding portion 33 is ro-tated and gradually pressed to the pipe P, despite it is a very s~all pressing power J the opening.end o the pipe P is guided to the curved surface groove 33 of the guiding portlon 33 and led to outside and eventually ~olded as shown in drawing whereby beco~les to a state being . 25 inserted to the outer circu~ference of said ring ~.
At a ti~e point that the olding back of the pipe is finished, when the handle 311 is reversel~ rot~ted, .' '. : .. :- - .
: . . . ~ .
the rotary pressing shaf-t 313 moves to opposite direction different fro~ the direction up to now, and the guiding port.ion 33 is left away fro~n the pipe P~ :
In t;his embodiment also, a matter that a suitable rolding back is done despite the pressing p~er against the openin~ end of the pipe of the guiding portion is very s~all, is clear ~y following test as well.
That is, this test is done in a state that the folding back work of the pipe providin~ an opening roll portion to a ter~inal end of the pipe of 17 ~m in ou ter diameter, 13 ~ in inner diameter, and 2 ~m in thickness o~ polybuten ~ade is not mounted with annular ring at its circu~Eerence, and its result is co~pared with technigue of clai~ 3 to 7 and technique in accordance with this e~bodimellt. In the drawing, a reference nu~eral symbol 31 i5 a tightening ~echanismJ
a nu~eral 33 is a guiding portion, a nu~eral 33a is a conica-ly protruded portion, numeral 33~ is a cur~ed surface groove, and P is a pipe.
~nIn contrast with this, in case of technigue related to clain 3 to 7, the guidin~ portion 33 is not rotated and the opening end of the pipe P is pressed, but in case where the ~artial of the pipe i.s a little hard material such as polybuten and the like, the opening end edge of the pipe P is out~ardly expanded with slidin~ within the curved sur~ace groove alongside the curved ~surface ~roove 33b by the pushin~ pressure . .
,. ' .
:: , , .
2 ~ 3 of the guiding portion ~3, but the end ed~e of the PiPe.
beco~es a so-called head pressed state at a time point that the ~ront end of the pipe is aclvanced to a bending point o~ the guiding portion shown in drawing, and big resistance is produced, and there ~ay be a case that energy of thrust makes de~ormation because of opening at a place s~aller in resistance than the thrust o~ the guiding portion side.
In contrast with this, in the invention related to 10 clai~ 8 to 11, thc resistance beco~es very small by a slant sur~ace e~fect and a ~oving friction, and thereby the ~ront end of the pipe is ~olded back by a weak thrust. And, the tightening ~orce of the cla~lping resistive to this weak thrust is all right even it. is small, and the apparatus is simplified.
Thus, in a case of this e~boditnent, since the guiding portion 33 applies a very ~eak pushing pressure in a direction of the pipe with rotating, a de~ornation is not produced as shown in FIG. 17J and the opening end of the pipe is folded back and a shape called by so-called opening roll is ~or~ed.
Thus~ in this e~bodi~ent, since the guiding portion is abutted to the openin~ end o~ the pipe with rotating, the opening end can be expanded and ~olded back by a s~all pushing pressure to axial direction, and this is thought that it is caused frotn a principle o~ screw or slant e~fect~ That is, a case of pushing - 2~ -.
~J ~
to opening end of the pipe without ~ivin~ a rotation tothe guidin~ portion corresponds to a case oE inserting a ~ed~e by strikin~ per~endi~ularly, while the. case oE
this invention which gradually inserts the guiding portion to -the opening end of the pipe with rotating is thought that it corresponds to a case of inserting a scre~ which dose not strike in a wedge.
Accordingly. in above-described e~bodiment of the invention, a case of rotating the guiding portion is described, but sa~e e~'fect can be obtained when the guiding portion is ~ixecl and the pipe side is rotated.
Further, in the above~desGribed e~bodiment, since the advancement to the opening end of -the pipe of the guiding portion is done by a screw, an advancing amount lS of the guidin~ portion Gan be finely adiusted and the~e~'ore, the ~olding back process of t,he opening end of the pipe can be freely done as shown in FIG.18.
That is, FIG.18(a) shows a case that the opening end of the pipe is made to a flange shape without fully folding back~ and FIG.18(b) shows a case that the ~olding back amount is stopped to a little extent.
Thus, in accordance ~ith the invention related to claim to 11, since the opening end of the pipe can be s~oothly and easily Eolded back and besides the pushing pressure for folding back can be finely adiusted, various folded back shapes can be obtained.
: ~ .
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body portion 21a of the bending ~eans 21 and the piston rod 22a is done by a sorew-coupling ~eans. Moreover, the resin pipe 26 made of materials of large in elasticity memory such as polytetrafluoroethylene) copolymer with perfluoroalkylvinylether(PFA)J for exa~ple, polyethylene(P~ polyprop~rene(PE?, polybuten~PB)J polyamide(PA) and the like, is most suitable for applying this invention.
The driving source 22 is a solenoid, an air cYlinder and other well known article. A re~`erence numeral sy~hol 23 is a core material inserted to a predeter~ined Position within the pipe 26, and a reference numeral symbol 24 is a ti~htenin~ mechanis for fixing the pipe 26 to a predeter~ined position, and a clamping means is made by these core material ~3 and the tightening mechanis~ 24.
And, a reference numeral sy~bol 25 is an annular body to be inserted to circu~ferential surface of the pipe 26.
~0 Mext, the foldin~ back method of the op~ning end of the resin pipe 26 together with an operation of the apparatus based on the above-described construction will be described with reference to FIG.6 and 7. As shown in FIG.6, ~irstly the annular body 15 is inserted to front end of the pipe 26. Since a settle~ent of this depth a needs a time. an insertin~ means 27 shown in FIG.7 was used. This inserting ~eans 27 having a ' ' ' ' :- ' 2 ~ Y~, 3 .~ ~ 3 function as a position de-termining means consists of a cylindrical portion 27a having an inner diameter sa~e as an outer dia~eter of the pipe 2~ a connecting portion 27b standin~ within this cylind~ical porti~n 27a, and ~ rotating bar 27c. Further, materials such as sa~e material as the pipe, or ~etal or h~rd plastic may be used for the annular body ~5.
The height of side wall of the cylindrical portion 27a is ~ade to be same as afore3nentioned depth ~, and the connectin~ portion 27b and the. eore material 23 are serew-coupled. Accordingly, after inserti.ng the annular bodY 25 to the pipe 26, when the cylindrical portion 27a i5 pushed Up until the front end oE the pipe 26 abuts to bottom of the cylindrical portion 27a with rotating the rotating bar 27c by inserting the core material 23 screw-coupled to the ccnnecting portion 27b to the opening portion of the pipe 26, the core material 23 and the annular body 25 are respeetively set up to a predeternined position, and simultaneously a foldin~ baok amount ~ becomes to be set at the front end of the pipe 26 as well. After these work, when the rotating bar 27c is reversely rotatecl) t.he screw-coupling of the core ~aterial 23 with the connecting body ~7b i5 released and the inserting ~eans 27 becomes left away from the pipe ~6.
FIG.8 to FIG.10 are diagrams showing the folding baek process of the front end of the piPe.
- lS -. : . - - , . :
. ..
- , .
.~
.
~ 3~
As shown in FIG.8, the pipe 26 is Eirmly held by the t.ightening mechanism 24. At this moment, since the core ~aterial 23 is inserted illtO the pipe 26, a de~or~ation and the like of the pipe 26 will not he occurred. And, the bendin~ ~eans 21 is abutted to the opening end o~ the pipe 26 by operatin~ the driving source 22 and at the same ti~e pushed to axial direction. Further, since the use of core ~aterial is for preventing its defor~ation at a ~oment of holding the pipe 26, it is used in a case of thin in thickness of the pipe and the like, and the core material is not necessaril~ required in case when the thickness of the pipe is relatively thick, or in case when engraved notches are formed to the holding portion of the pipe ~hereby a gripping ability is raised.
The conically protruded portion 21b advances also by outwardly expanding the opening end of the pipe 26 along with the advance~ent of the bending ~echanism ~1.
To this end~ the opening end of the pipe 26 ~loves alongside the side surace of the conically protruded portion 21b. And, the opening encl o~ the pipe 26 reaches the curved surface groove 21c by a fur-ther advancement oE the main body portion 21a of the bending means 21. SinGe this curved surfaGe groove ~1c is ~ormed with approxl~atel~ U-shape in cross section, the front end portion oE the pipe ~6 passes a botto~
: portion of U~shape by acco~panying with the further .
' aclvance~le.nt ,~ t.he main bcldy 21a, ancl becc,mes tc be folded back with char-lging the direction. (re~er to FIG.9) And, when the opelling end of the pip~ 26 i~
co~pletely folded back alon~side the annular body ~5~
the advancemellt o~ the bendill~ means ~ stopped, and successively moved back to reverse direction different from the direction up to now. (re~er to FIG.10) And, after screw-coupling the core ~naterial 23 within the ln pipe 26 by using the a~ore~lerltionecl inserting meallci 27J
it is pulled out to outside of the pipe 26, and the work is finished. Further, the height o~ the ~olded back portion is macle to be lower in compliance with the re~uirement, and it ~ay he used so as not.~ to cover the annular body 25.
FI~.11 is a diagram showing another e~lbodiment o~A
the a~orementioned annular ~ody. In this e~bodi~nent, the annular ~od~ 51 and the nut N are inte~rally ~ormed.
FIG.12 and FIG.13 show a case that the opening end is ~olded back without ~ixing the anrlular body 25 to the pipe, and a Elange portion is ~'ormecl to the pipe end.
FIG.14 is a dia~ram sho~ing a oase o ~'orn~ing a ; 25 ~lange portion to the~pipe end. In this embodi~nent, the bending .~eans 21 includes an annular convex strip portion 21d other than the main body portion ~1aJ the . .
- ' . ;' : ~ . ' .
,, ; ' ' ' '. ". ' . . ' :. ' , .
conically protruded portion 21b, an~ the curved sur~ace groove 21c. An inner dia~eter of this convex strip portion 21d is ~ad~ to be slightly bigger than an outer diamcter 01 tll~ rolded back portion o~ 1;he pipe 2~;
closely contacted to the curved surface groove 21c To this end, when a folding work of the pipe 26 is ~inished and the bending ~eans Z1 is retreated, a small sxpanded portion produced at the ~olded back portion of the pipe 26 receives a pressure of the convex strip portion 21d and then co~pensated J and the folded b~ck portion is closely contacted -to an out~r circu~ferential sur~ace of the annular body 25 in a s~ooth state The embodiment of the invention in accorclance with the above-described clai~ 3 to 7 can exactly and rapidl~ manufacture a resin pipe ~olcled back the ~ront opening end to outer circu~ferential surface side.
MoreoverJ in case o~ connectlng the conventional pipe by a coupling and the likè, a troubleso~e process to cut so as to nake the end sur~ace of the pipe to be a right angle in axial direction ~as required, but in accordance with the technique by this applicationJ
since an end surface of the opening portion of the folded back pipe ~orms a exact right angle a~ainst the axial direction, a conventional troubleso~e process as afore~entioned is not necessary.
FIG.15 is a diagra~ sho~ing a str~cture of the .
. 3 folding back apparatus in accordance with an em~odilllentof this clai~ ln. In accordance with this drawi.n~, it will be described by going abreast of the embodila~nts o~ the ~olding back ~rlethod 01 claim ~3 and the foldin~ back apparatus o~ clai~ 10.
In the drawings, a re~erence numeral sy~bol 31 i~
a ti.ghtening ~echanism for holding by pressing the resin pipe P in radial direction, and a reference nu~eral sy~bol 32 is a bending means, and which are ~ade of a guiding portion 33 for rotating by contacting to the opening end of the resin pipe P, a rotational driving mechanis~ A for rotating this guiding portion 33, a reciprocating ~echanis~ B for advanoing and retreating the afore~entioned guidin~ porti.on 33 to axial direction o~ the pipe P, and an enclosure body C
including these.
And, said guiding portion 33 includes a conically protruded portion 33b to be inserted to an opening portion of the pipe P and a curued surface groove 33a 20' whiGh is ~or~ed around this and its cross section is approximately U-shape.
And, the rotational drivin~ ~echanis~ A co~prises a rotary shaft 34 rotatably supporte,d to the enclosure body Cl a wide teeth gear 35 fixed to this rotary shaft .
25 4, a thin teeth gear 36 ~ixed to a ~otor so as to be "' ~eshed to thls wide teeth eear 35, and a ~otor 37 for rotating this gear 36 freely to right and left.
.
.. . . : . . : .
In addition, the reciprocating mechanis~ Bcomprises an advancing/retreating shaft 38 in which a housing 39 rotatably coupling a flange portion ~or~ed a-t rear end Or ~aid rota~y ~ha~`t 3 is ~ d at. on~ end and having a rotating handle 311 at another end~ and a bearing portion 310 fixed ~et~een said ~lange portion .and bottom surface of the housing 39 within the housing 39~
A threaded portion is formed at an outer circu~erence of th~ advancing/retreating shaft 38, ~nd it is screw-coupled to a bearing Cl o~ the enclosure body C, and the advancing/retreati.n~ shaft 3a is made to be advanced and retreated in axial direction ln response to the rotation of the handle 311~ Further, a reference numeral symbol 313 is a bearing portion pro~ided to the bearing of said rotary shaft 34 and the enclosure body C~ In accordanee with the a~ore~entioned construction, an operation of -this e~bodi~ent will be described~
Firstly, a ring R is inserted to the outer cirGumference o~ the resin pipe P, and it is fixed to a predetermined position by the ti~htening mechanis~ 31~
The conically protruded portion 33a of the guiding portion 33 is inserted to the opening portion of the ~5 pipe P and at the sa~e ti~e, the opening end of the pipe P is contacted to the curved sur~ace groove 33b.
In this state, the rotarY shaEt 4 is rotated by the -- ~0 --,; . ' ; , ' :
.. ~ . . ................ .
... . . . . . . .
2 ~
~otor M and the guiding portion 33 is :rotated to either direction of right or left.
At this ~o~ent, the rotation of the rotary shaft 34 is trans~erred to the guiding porti~n 33, but i-t is S not transEerred to said advancin~/retreating shaft 38.
At a time point that the guiding portion 33 is abutted to the~ opening end o~ the pipe P and star-ted a sliding, the rotary sha~t 38 is advanced in a direction of arrow ~ bY rotating the advancing/retreatin~ sha~t 38 to a predeter~ined direction b~ the handle 3:ll. By the advancement of the advancing/ret:reating shaEt 38 toward arro~ ~, the housin~ oP the end portion of the advancing/retreatin~ shaft 38 pushes the rot~ry sha~'t 34 to arrow a direction through the bearin~ portion 15 310.
When the rotary shaft 34 is pushed, the wide teeth gear 35 moves to arrow A direction by re~oving the meshing portion of the gear 36 in axial direction.
Thus, when pushing it to p,ipe P by rotating the 2Q guiding portion 33, despite it is a very litkle Pressing power, the openin~ end of the pipe P is guided to the curved surface ~roove 33b of the guiding portiQn 33 and led to outside and eventually the : advancing/retreatin~ shaft 3~ is ~rloved t~ opposite direGtion of arrow ~, and the rotary shaft 34 coupling to the housing at its one end is also ~oved by following the retreat o~ the advancing~retreat~ng sha~t '.`; :'.
: .: ' . . . . . . . .
: ' : , .:
.. . .. . . . . .
3 ~
38, and the cylindriGal gea~ 35 and the ~ear 36 are nteshed and it is returned to original position.
By the way, in this method, a Inatter i.n which the pushing pressure to direction of pipe P of the guiding portion 33 is all right even if it is very s~lall, is as like as afore~entioned, but a result tested by co~paring this to the technique disclosed in clai~n 3 to claim 7 is as follows.
That is, in case where an opening end of PFA pipe of 1~.5 mm in outer diameter, 9.5 snrn in inner diameter, and l.S mm in thickness is folded back and formed to 7 mm in length o~ the fold.ed back porti.on and 4 m~n in thickness o~ the Poldecl back apex portion, the pushing pressure required for the advancement of the guiding portion was approximately 230 Kg.
In contrast with this, in this embodiment) a folding back of same condition with aforesnentioned uas made by a pushing pressure of approximately 5~ Kg in presumption.
~IG.16 is a diagram showing an embocliment of the ~'olding back apparatus in accorclance with claim l:L. In an apparatus related to this embodiment, different fro~
a~orementioned embodimentJ the rotational driving mechanism rotating the guiding portion and the reciprocating mechanism -Eor advancing and retreating the guiding portion are integrally struct~red. That is, in the drawin~s, a reference nu~eral symbol 31 is a ~ - 22 - .
,, . . , ., . , : .
. - ~ , . . ~
.. . . .
~ . - . ' .
tightening mechanis~ for holding by pushing the resin pi.pe P in radial direction, a reference nu~eral symbol 32 is a bending means, and which consists of a guiding portion 33 ~or ~ontacting to thc opening end o~ the resin pipe P and rotating thereof J a rotational driving n~echanis~ for rotating this guiding portion 33, and a reciprocating mechanism ~or advancing/retreating said guiding portion 33 to axial direction of the pipe, and these rotational drivi.ng ~echanisln and the reciprocating ~echanism co~prise a rotary pressing sha~t 313 and a bearing 313a for bearing this by screw-coupli.ng to the thread of this rotary pressing shaft 313, and a handle 311 fixed to ter~ninal end portion of the rotary pressing shaft 313, and the rotary pressing shaft 313 advances to or retreats fro~
~he pipe P by doing ~ helical movement by the rotation of the handle 311, and accordingly the guiding portion 33 fixed to front end of this rotary pressing shaft 313 becomes also advances to or retreats Erom the opening end of the pipe P wi.-th rotatin~.
Further, the guiding portion 33 as in aforesaid e~bodi~ent includes a conically protruded portion to be inserted to the opening end of the pipe P and a curved surface groove 33b of approximately U-shape in cross ~5 section and for~ed around this.
Qperation of this embodiment will be described in accordance with the afore~entioned structure.
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Firstly, a ring R is inserted to the outer circu~ference of the resin pipe P, and fixed to a predetermined position by a tightening ~echanisrn 31, and the rotary ~ressin~ sh~t 31~ i~ advanoed to a direction of the pipe P by rotating the handle 311 where~y the conically protruded portion 33a of the guiding po~tion 33 is inserted to the opening portion of the pipe P and at the sa~e ti~e, the opening end of the pipe P is contacted to the curved sur~ace ~roove 33b.
At a time point that the ~uiding portion 33 has started a sliding move~ent by abuttin~ to the opening end of the pipe P, when the handle 311 is further rotated, the rotary pressing shaft 313 adYances to the direction o~ the pipe P by doing a helic~l ~ovement, and acco~panying with this, the guiding portion 33 is also rotated and presses this with contactin~ by sliding to the opening end of the pipe P.
Thus, when the guiding portion 33 is ro-tated and gradually pressed to the pipe P, despite it is a very s~all pressing power J the opening.end o the pipe P is guided to the curved surface groove 33 of the guiding portlon 33 and led to outside and eventually ~olded as shown in drawing whereby beco~les to a state being . 25 inserted to the outer circu~ference of said ring ~.
At a ti~e point that the olding back of the pipe is finished, when the handle 311 is reversel~ rot~ted, .' '. : .. :- - .
: . . . ~ .
the rotary pressing shaf-t 313 moves to opposite direction different fro~ the direction up to now, and the guiding port.ion 33 is left away fro~n the pipe P~ :
In t;his embodiment also, a matter that a suitable rolding back is done despite the pressing p~er against the openin~ end of the pipe of the guiding portion is very s~all, is clear ~y following test as well.
That is, this test is done in a state that the folding back work of the pipe providin~ an opening roll portion to a ter~inal end of the pipe of 17 ~m in ou ter diameter, 13 ~ in inner diameter, and 2 ~m in thickness o~ polybuten ~ade is not mounted with annular ring at its circu~Eerence, and its result is co~pared with technigue of clai~ 3 to 7 and technique in accordance with this e~bodimellt. In the drawing, a reference nu~eral symbol 31 i5 a tightening ~echanismJ
a nu~eral 33 is a guiding portion, a nu~eral 33a is a conica-ly protruded portion, numeral 33~ is a cur~ed surface groove, and P is a pipe.
~nIn contrast with this, in case of technigue related to clain 3 to 7, the guidin~ portion 33 is not rotated and the opening end of the pipe P is pressed, but in case where the ~artial of the pipe i.s a little hard material such as polybuten and the like, the opening end edge of the pipe P is out~ardly expanded with slidin~ within the curved sur~ace groove alongside the curved ~surface ~roove 33b by the pushin~ pressure . .
,. ' .
:: , , .
2 ~ 3 of the guiding portion ~3, but the end ed~e of the PiPe.
beco~es a so-called head pressed state at a time point that the ~ront end of the pipe is aclvanced to a bending point o~ the guiding portion shown in drawing, and big resistance is produced, and there ~ay be a case that energy of thrust makes de~ormation because of opening at a place s~aller in resistance than the thrust o~ the guiding portion side.
In contrast with this, in the invention related to 10 clai~ 8 to 11, thc resistance beco~es very small by a slant sur~ace e~fect and a ~oving friction, and thereby the ~ront end of the pipe is ~olded back by a weak thrust. And, the tightening ~orce of the cla~lping resistive to this weak thrust is all right even it. is small, and the apparatus is simplified.
Thus, in a case of this e~boditnent, since the guiding portion 33 applies a very ~eak pushing pressure in a direction of the pipe with rotating, a de~ornation is not produced as shown in FIG. 17J and the opening end of the pipe is folded back and a shape called by so-called opening roll is ~or~ed.
Thus~ in this e~bodi~ent, since the guiding portion is abutted to the openin~ end o~ the pipe with rotating, the opening end can be expanded and ~olded back by a s~all pushing pressure to axial direction, and this is thought that it is caused frotn a principle o~ screw or slant e~fect~ That is, a case of pushing - 2~ -.
~J ~
to opening end of the pipe without ~ivin~ a rotation tothe guidin~ portion corresponds to a case oE inserting a ~ed~e by strikin~ per~endi~ularly, while the. case oE
this invention which gradually inserts the guiding portion to -the opening end of the pipe with rotating is thought that it corresponds to a case of inserting a scre~ which dose not strike in a wedge.
Accordingly. in above-described e~bodiment of the invention, a case of rotating the guiding portion is described, but sa~e e~'fect can be obtained when the guiding portion is ~ixecl and the pipe side is rotated.
Further, in the above~desGribed e~bodiment, since the advancement to the opening end of -the pipe of the guiding portion is done by a screw, an advancing amount lS of the guidin~ portion Gan be finely adiusted and the~e~'ore, the ~olding back process of t,he opening end of the pipe can be freely done as shown in FIG.18.
That is, FIG.18(a) shows a case that the opening end of the pipe is made to a flange shape without fully folding back~ and FIG.18(b) shows a case that the ~olding back amount is stopped to a little extent.
Thus, in accordance ~ith the invention related to claim to 11, since the opening end of the pipe can be s~oothly and easily Eolded back and besides the pushing pressure for folding back can be finely adiusted, various folded back shapes can be obtained.
: ~ .
': :
Claims (11)
1. A coupling comprising a nut shaped tightening means 1 having an outer annular portion and an inner annular portion, and a coupling's main body 2 which has a stopper portion 7 at inner circumferential surface and simultaneously screw-coupled between said outer annular portion 1a of the tightening means 1 and the inner annular portion 1b, and holding by pressing a folded back portion 4a of a resin pipe 4 between the stopper portion 7 and an end edge of said inner annular portion 1b; and said tightening means 1 forming a threaded portion at inner circumferential surface of the outer annular portion 1a and at the same time providing a lip seal 5 closely contacting to inner surface of the coupling's main body around this concave portion end, and said coupling's main body 2 forming a threaded portion screw-coupling to the threaded portion of said outer annular portion 1b at the outer circumferential surface and on the other hand, forming a taper portion 2a gradually decreasing a diameter from the opening portion and a straight portion 2b continuing to this at inner circumferential surface and simultaneously forming a groove portion at a portion abutting with folded apex portion 4b of the resin pipe 4 in said stopper portion 7.
2. A coupling as defined in claim 1, wherein a protruded strip band 6 for coupling more firmly with this by abutting to the folded back portion 4a of the resin pipe 4 is provided around the circumferential surface of said concave portion 8 in the inner annular portion 1b of nut 1.
3. A method for folding back an opening end of resin pipe comprising following processes:
(a) a process for mounting an annular body to outer circumference of the pipe, (b) a process for pushing an opening end of the pipe to axial direction of the pipe with outwardly expanding it, (c) a process for continuing said pushing and folding back the opening end of the pipe, and inserting the folded back opening end of the pipe to outer circumference of said annular body.
(a) a process for mounting an annular body to outer circumference of the pipe, (b) a process for pushing an opening end of the pipe to axial direction of the pipe with outwardly expanding it, (c) a process for continuing said pushing and folding back the opening end of the pipe, and inserting the folded back opening end of the pipe to outer circumference of said annular body.
4. A method for folding back an opening end of resin pipe as defined in claim 3, wherein a core material is inserted into the pipe and the pipe is clamped at a position inserted with this core material so that the folding back of the opening and of the pipe is done.
5. An apparatus for folding back an opening end of resin pipe comprising a clamping means of the pipe and a bending means 21 and a driving means 22 of these; and said clamping means consisting of a core material 23 to be inserted into the pipe 26 and a tightening mechanism 24 for pushing the pipe 26 to axial direction; and said bending means 21 for pushing the opening end of the pipe 26 to axial direction of the pipe by the driving means 22 consisting of a main body portion, and a guiding portion which abuts to entire circumference of the opening end of the pipe and outwardly expanding the opening end of the pipe accompanying with the pushing action toward pipe axis direction of the main body portion.
6. An apparatus for folding back an opening end of resin pipe as defined in claim 5, wherein said guiding portion consists of a conically protruded portion 21b and a curved surface groove 21c formed around this circumference.
7. An apparatus for folding back an opening end of resin pipe as defined in claim 5, wherein a position determining means 27 for determining a relative position of the core material and the annular body and the folding back portion in the pipe is provided.
8. A method for folding back an opening end of resin pipe comprising following processes:
(a) a process for inserting said conically protruded portion of the guiding portion including a conically protruded portion and a curved surface groove formed around this circumference to the opening end of the pipe and simultaneously advancing with rotating the guiding portion, (b) a process for continuing an advancement with rotation of said guiding portion and folding back the opening end of the pipe by utilizing a force restoring by elasticity.
(a) a process for inserting said conically protruded portion of the guiding portion including a conically protruded portion and a curved surface groove formed around this circumference to the opening end of the pipe and simultaneously advancing with rotating the guiding portion, (b) a process for continuing an advancement with rotation of said guiding portion and folding back the opening end of the pipe by utilizing a force restoring by elasticity.
9. A method for folding back an opening end of resin pipe comprising following processes:
(a) a process for mounting an annular body to a circumference of the pipe, (b) a process for inserting the conically protruded portion of the guiding portion including a conically protruded portion and a curved surface groove formed around this circumference to the opening end of the pipe and simultaneously advancing with rotating the guiding portion, and (c) a process for continuing the advancement with rotation of said guiding portion and folding back the opening end of the pipe, and inserting the opening end of the pipe folded back around the circumference of said annular body.
(a) a process for mounting an annular body to a circumference of the pipe, (b) a process for inserting the conically protruded portion of the guiding portion including a conically protruded portion and a curved surface groove formed around this circumference to the opening end of the pipe and simultaneously advancing with rotating the guiding portion, and (c) a process for continuing the advancement with rotation of said guiding portion and folding back the opening end of the pipe, and inserting the opening end of the pipe folded back around the circumference of said annular body.
10. An apparatus for folding back an opening end of resin pipe comprising a clamping means for holding a pipe P and a bending means 32, and said clamping means including a tightening mechanism 31 for pushing the pipe to radial direction, and said bending means 32 including a guiding portion 33 abutting to the opening end of the pipe and advancing with rotating, a rotational driving mechanism A rotating the guiding portion 33, and a reciprocating mechanism B for advancing/retreating the guiding portion 33 toward the pipe axis direction, so as to outwardly expand the opening end of the pipe and simultaneously folding back to axial direction.
11. An apparatus for folding back an opening end of resin pipe as defined in claim 10, wherein said guiding portion 33 includes a conically protruded portion 33a and a curved surface groove 33b formed around this circumference.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4237622A JPH0664040A (en) | 1992-08-14 | 1992-08-14 | Method and apparatus for turning reversely opening end of resin pipe |
| JP4-237622 | 1992-08-14 | ||
| US08/104,820 US5439259A (en) | 1992-08-14 | 1993-08-10 | Coupling and method for folding back a pipe and using for it and its apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2103643A1 true CA2103643A1 (en) | 1994-02-15 |
Family
ID=26533287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002103643A Abandoned CA2103643A1 (en) | 1992-08-14 | 1993-08-09 | Coupling and method for folding back a pipe end using for it and its apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5439259A (en) |
| EP (1) | EP0584009A3 (en) |
| JP (1) | JPH0664040A (en) |
| CA (1) | CA2103643A1 (en) |
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| KR200476530Y1 (en) * | 2013-09-23 | 2015-03-18 | 주식회사 케이씨텍 | Nozzle module and cleaning apparatus having the same |
| WO2015171998A2 (en) | 2014-05-09 | 2015-11-12 | Swagelok Company | Conduit fitting with components adapted for facilitating assembly |
| FR3047059B1 (en) * | 2016-01-26 | 2018-01-19 | Saint-Gobain Performance Plastics France | CONNECTION ASSEMBLY FOR TUBE |
| US10584814B2 (en) | 2016-03-23 | 2020-03-10 | Swagelok Company | Conduit fitting with stroke resisting features |
| JP5958848B2 (en) * | 2016-04-14 | 2016-08-02 | 株式会社オンダ製作所 | Pipe covering layer folding jig |
| CN107284094B (en) * | 2017-07-07 | 2022-09-16 | 义乌市鼎邦文体用品有限公司 | Assembling method of rocking handle structure of hand-operated pencil sharpener |
| GB201903367D0 (en) * | 2019-03-12 | 2019-04-24 | Bio Optimal Ltd | Connection System |
| US11504918B2 (en) * | 2020-02-14 | 2022-11-22 | Delta Faucet Company | Cross-linked pex forming after assembly |
| CN115192945B (en) * | 2022-07-06 | 2023-05-23 | 高邮市顺通消防装备有限公司 | Fire control is with fire control interface based on formula installation can be convenient to magnetism |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA627199A (en) * | 1961-09-12 | The Weatherhead Company | Tube nut | |
| US1058542A (en) * | 1912-10-01 | 1913-04-08 | Sydney L Brown | Pipe-coupling. |
| FR547776A (en) * | 1922-01-16 | 1922-12-23 | Westinghouse Freins | Improvements to fittings for pipes and other similar elements |
| GB443040A (en) * | 1934-09-26 | 1936-02-20 | May Hilda Hunt | Improvements in pipe joints |
| FR1238867A (en) * | 1959-07-08 | 1960-08-19 | Conducto | Watertight connection for flexible ducts |
| US3494643A (en) * | 1966-06-03 | 1970-02-10 | Pacific Western Extruded Produ | Beaded plastic tubing joint |
| US3710428A (en) * | 1971-06-09 | 1973-01-16 | Reed Mfg Co | Plastic pipe flaring tool |
| US4072328A (en) * | 1976-05-25 | 1978-02-07 | Hepworth Plastics Limited | Pipe couplings |
| US4127021A (en) * | 1976-12-01 | 1978-11-28 | Johnson Andrew L | Tube flaring set |
| FR2385969A1 (en) * | 1977-03-28 | 1978-10-27 | Chatelain Michel | Two piece coupling for flexible hose end - to secure the end without restricting through flow |
| US4133565A (en) * | 1977-07-25 | 1979-01-09 | Shutt George V | Fitting employing flexible plastic tubing with rolled back end |
| IL64379A (en) * | 1981-11-26 | 1989-01-31 | Plasson Maagan Michael Ind Ltd | Tube connection fittings |
| JPS59122080A (en) * | 1982-12-27 | 1984-07-14 | Leo Giken:Kk | Generating method of dot picture |
| US4538842A (en) * | 1983-09-08 | 1985-09-03 | Imperial Clevite Inc. | High pressure, leakproof, blowout-proof tube fitting |
-
1992
- 1992-08-14 JP JP4237622A patent/JPH0664040A/en active Pending
-
1993
- 1993-08-09 CA CA002103643A patent/CA2103643A1/en not_active Abandoned
- 1993-08-10 US US08/104,820 patent/US5439259A/en not_active Expired - Fee Related
- 1993-08-11 EP EP19930402039 patent/EP0584009A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0584009A2 (en) | 1994-02-23 |
| EP0584009A3 (en) | 1994-05-25 |
| JPH0664040A (en) | 1994-03-08 |
| US5439259A (en) | 1995-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |