US 2477910 A
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Description (OCR text may contain errors)
Au 2, 1949; E TAL 2,477,910
: Emcmoa FOR 1% PROCATING BENDER WITH PIVOTED SIDEARMS Filed Jan. 16, 1947 INVENTOR EDWARD 77 7 64 m-woeuivs III/"L Patented Au 2, 1949 EJECTOR FORIRECIPR'OICATING BENDER WITH PIVOTED SIDEARMS Edward T. Tal, Milwaukee, Wis., assignor to Tals Prestal Bender, Inc., Milwaukee, Wis., a corporation of Wisconsin Application January 16, 1947, Serial No. 722,380
This invention relates to pipe bending apparatus, and it is particularly concerned with a device arranged to disengage a bent section of pipe from a central forming member about which the pipe may have been shaped in providing the bend therein. This application is acompanion to application for U. S. Patent on Pipe bending apparatus, by Henry A. Mueller, Serial Number 722,410, filed January 16, 1947.
In the said companion application of Mueller there is disclosed apparatus useful in providing bends up to 180 insections of pipe, the pipe there being pressed into the channeled, forwardly arced surface ofv a forming member. When bent in this manner, even to an extent considerably less than 180, the pipe tends to become bound in the channel and may be removed therefrom only with difliculty. I I 1 It is a primary object of the present invention to provide an improved device for disengaging a bent pipe section from a forming member over which the pipe has been bent or shaped.
A more particular object is to provide apparatus whereby the forming means to which the pipe has become bound may be anchored and the' force of the forming ram or plunger thereafter utilized to disengage the pipe from the anchored forming means.
Other objects of the present invention will become apparent from a consideration of the following description and appended claims, and of the accompanying drawings, wherein: V
Figure 1 is a plan view of a pipe ejector embodying the features of my invention, and showing the same in association with pipe bending equipment preparatory to an ejecting operation, a fragment of the bending equipment being broken away.
Figure 2 is a fragmentary plan view of the ejector with portions of the bending equipment removed, the plunger retracted, and the ejecting pin inserted for operation by the plunger.
Figure 3 is a view similar to Figure 2, showing the plunger advanced and the pipe ejected to a position where it can bemanually removed from the forming member.
In the drawing, like parts are identified by the same reference numerals in the several views.
The apparatus generally shown in Figure 1 is arranged to provide permanent bends up to 180 in a section of pipe. While the bending apparatus and its method of use are particularly described in the said companion application of Mueller, the same will be briefly described here 6 Claims. (01. 153-33) 2 that the present invention may be the more readily understood- The bending apparatus illustrated includes a cylinder Ia having aplunger II which detachably carries a forming element I2. The leading surface I3 (see Figure 3) of the element I2 is channel shaped and arcuate to provide a pipe engaging portion which mayexce'ed Opposed frame pieces I i are secured to cylinder IIZI,v and mounted betweenthe-frame pieces upon removable spindles I5 are rollers I6 and intermediately fulcrumed levers I'l pivotal coaxially with rollers I6. Levers If, each of which comprises spaced plates I8 andfilii', carry. pipe engaging rollers I9 on their forward arms, and pipe engaging rollers 20 on'the rearward arms.
The apparatus described above will provide any bend up to'180 in a section of pipe 2I, the bend being made as the pipe is pressed into conformity with surface. I3. asthe-forming element isadvanced by plunger II between the rollers I6; As the advancing pipe engages rollers I9, levers H are swung aboutv their axis until rollers 20' engage sections of pipe 2I extending rearwardly of the forming element I3. With continued advance of the pipe, the said rearwardly extending sections are pressed towards each other until an initial bend somewhat in excess of 180 has beenprovided in the, pipe. Once the pipe has been removed from the apparatus it will tend somewhatto assume its original position and the final bend will approximate 180"; 7
After the bendingoperati n is complete, the next step, preparatory to removing the pipe from its position of engagement about forming element I2, is to retract the said element and pipe until spindles I5 and'the rollers I6 and levers I! carried thereby can be removed, as indicated in Figures 2 and 3.
As noted above, pressing the pipe 2| into the channeled surface I3 tends to bind the pipe to forming element I2, and the bent pipe is then hard to remove.
I provide element I2 with an aperture, or bore, 30 which is aligned with the plunger I I, the bore opening at one end adjacent the point of contact with the plunger and at the other end in the center of the channeled surface I3. Frame pieces I4 and the forming element I2 are provided with registering openings 3|, and when these openings are brought into alignment through movement of the forming element I2, anchorage pins 32 may be fitted therein so as to secure the forming element between the frame pieces. After this anchorage has been effected, plunger II is withdrawn from its position of engagement with forming element l2 (Figure 2) and an ejector pin 33 is then fitted within the bore 30, this pin having a length greater than that of the bore. The ejector pin is a plunger extension which is separate from the plunger as herein disclosed only because the-plunger stroke'is short, When plunger :l l is again advanced, it engages pin 33 and forces the same against the inner surface of the formed section of pipe 2|, thereby ejecting:
the pipe from channel l3 (Figure 3). The pipe may then be manually withdrawn the rest for the way from the apparatus.
It only remains to removathe anchoring 'pins 32 and the ejector pin 33 to-preparethe apparatus for use in a subsequent bending operation.
1. In a pipe bending tool, the combination with a set of guiding wings, of a pipe bendingselee. ment movable betweeng said wings into contact with a'pipe to bend the lattensaidaelemer t having an aperture in its line of movement, an =eje ctor pin insertable in the-aperture,- a hydraulic cylin- -der fixed tosaid wings "in line with the aperture in said element-and having a plunger detachably engaged therewith and retractable to a position for insertion :ofisaid pin into andfor forcing said pin through theaperture, and means for holding said elementzagainst movement relative to said wings whilesaid pin is being forced through the aperture.
2. The ,combinationriofclaim l-wherein said holding means comprises locking pins for connecting the element with itsguiding wings.
3. A device of the character described, comprising a cylinder, a plunger projecting from one end 'of the cylinder, .a forming block in dine with the plungerand engageablaby therexposedlendthereof 'said block having a borerextendingtherethrough aligned with said'plunger; pipe1intercepting means connected-with a iwalliof-said cylinder and arranged toshape a i pipe -over anadvancin leading surface of -said formin l block; meanseior anchoring said'block after a pipe b'endingiopera- -tion,: andan' overlength"ejector pin slidably 'mounted within said bore' for disengaging the pipe from said-anchored-block: under pressure applied bysaidpluhger. V
l 4. The -device-'-of-cl'aim- 3 in fu-rther combination with a frame-member connected 'to a wall of saidcylinder, said frame-member serving to support said-pipeintercepting'means and-as an anchorage for'said forming block, and wherein 1 with the .formingelemenlt for reciprocation thereof, means for detachably connecting the forming element with the supports instead of the plunger upon completion of a forming operation, said "element having a bore opening through it into itschannel in the direction of plunger reciprocaxtion, and a plunger extension movable in the bore "for workejectionfrom the channel under plung- '=er actuationwhen the said element is released LAO from the plunger and connected to the supports.
' 6. In a pipe bending machine, a frame, a pressure operated piston in a cylinder connected with the frame, a pipeebending block movable in the :frame- .upon application .thereto -of pressure by the pistongthe block having a passage there.- through to the pipe engaging surfacethereof -;and in the line ,of pressure;;application toflthe block by the piston, .means :for :fixing the position of the blockin theframein spacedrelation .with theend of the piston, and arr ejectoiznpin of greater length than .the lengthlof theblockpassage and insertable intosthe; block; passage through the space between the .end.of.:.the .piston x and.the'block,i.the application ofzpressure toiithe pm" by the piston .acting-zonr a lpipewengagedmin ,the r block for; releasing the. ;pipe.
; EDWARD T. V'DAL.
REFERENCES CITED The 'followingmeferences areiof record inthe file of this patent:
UNITED STATES PATENTS Number Name Date 174,609 *Wright ;Mar; '1, I876 1,775,762 Harvey 'Sept. 16, 1930 1,895,401 -Simonsen Jan.fi24, 1933 2,147,882 Childs L Feb3'21, 1939 2,229,393 *Stefien Jan. '21, 1941 2,246,992 Dickinson June 24,1941 2,382,266 Simonsen A ug. 14;1945
, FOREIGN-V PATENTS Number Country Date 583,954 'Germany "Sept. 12, 1933