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Publication numberUS2195204 A
Publication typeGrant
Publication dateMar 26, 1940
Filing dateJun 14, 1935
Priority dateJun 14, 1935
Publication numberUS 2195204 A, US 2195204A, US-A-2195204, US2195204 A, US2195204A
InventorsGartin Elmer G
Original AssigneeSullivan Machinery Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pressure fluid motor
US 2195204 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

' Massachusetts -Apgliation June-14,

Sullivan Machinery lCompany, 'a vcorporation of Renewed June 5, 1939` My inventionv relates to pressure fluid motors,

and more particularlyr to. improved blow'varying means for a percussive motor of thetype normally usedl forrock drilling vandsimilar'purposeszfy An object of myy invention is` tol provide' an improved pressure iluid hammer motor having incorporated therein vimproved fblow varying means. Another; objectis to provide an improved pressure fluid motor of the impact type especially ,designed for usewith rock drills .or-

other impacttools andhaving .improved means incorporated therein for varying ,the blow struck so .thatv heavy; medium or. lightr blows may be; transmitted to the working-z implement as desired.

Still another objectfof {they invention is to provide an improved'pressure fluid motor of. the

. type mentioned having improvedgblowvarying j from one blow-force-.to ganother, and in* which 2.0

means permitting vextremely simple `changing improved means .is provided for precluding any irregularity in the, operatiOnoifthe-motor duringv drilling `in ground 'Wherefrearward" movements oithepiston are retarded due to resistance4 to'. rotation-1 These' and other .f objects .ofy the inventionwill hereinafter more'fullyappear.`A f In the accompanying- `drawingin-which there is shown for purposes kofillustration' one form which the invention maylfassume `in;practice,

i Fig.v 1 is aviewin longitudinal'section through apercussive motor having `embodied therein 'the illustrative.` embodiment.

varying means. f v section on aplane sponding to the line 2-L2 of Fig. 1.

ofthe improved blow A Fig.3 ista.horizontal.sectionfon"a'plane: corresponding. tothe line 3 3of Figli.

Fig. 4v is affragmentary sectional rview on the plane ofthe section line 4-4`fof Fig. 2.

Fig. 5 is' a. view-similar tothataof F1g. -4 .miv

5 5 of Figiz. 6 is a transversellsectionona plane corresponding to theline-'S-'B of Fig-1*.r

Fig. .7 is a sectional/view through taken on he planet-corresponding ...to theA `line Fig. .8" is'a viewgpartially 'in Eelet'rationandi.

:partially in transverse section o'n'the plane Vcorparts in 'a' different position.

` Fig. 9 isy aseotion onlthel-plane l Referring to thev drawing; it-

be observed that .a pressure fluid .operated percussivermotor l is shownzand .has. a cylinder;v 2y having ,a bore ,(CiLv 121%12) l l thedriu cylinderilon al plane corresponding to the line corresponding 3 in whicha hammer piston ll.A is reciprocable. e The. hammer piston 4 has a striking b ar 5- having'v grooves therein which cooperate 'with a "chuck nut 'l. -to effectfrotation, lj/,h r'oughy any suitable-mechanism, of a percussivetool 8 which is'adapted to be .struck bythestriking bar`5 v vonthe vforward movements of the `hammer piston Intermittent rotation of the hammerpis-y Iton .iseffected ley-means 'of ariebar I IJ, herein lformed integral .with its paWl carrie1;|l supporting. 'pawls rl2f'cooperating withftheratchet ring 3 inounted v4in arear headmember i4' Whichycooperates with the cylinder 'A2 in maintaining in position a rear cylinder head l5.v `A valve mechanism generallyr designated I6 comprisesv a -valve, chest 'l'ljhavingf a lbore *18. in which11a n iulti-spool valve ,|51 is' reciprocably mounted.` @Under the control of amanually'mov- "able throttle valve 2.0, pressure'iiuid isadmitted fromjanysuitable supply connection 2| through v20 a passage 22 to ahcentral supply-groove 23.in zthe valvelchestyand groove 24 in the `valve .19' isadapted to connect the supply groove 23 withthe-pas'sage 25 opening Vinto the "rear end of the cylinder bore 3 tofefect forward motion of the piston. Another groove'v 26 in the valve'V I9 is adapted toconnectthe supply. groove '23,v infa l different position ofthevalve, with a passage `21 leadingv to tl'lef forward end of the `'cylinder looreil;` vExhaust]grooves 28, 29 ar e lformed in 4thevalve chest and are alternatively connectible respectively with the oonnectionsmZE and 21 I to effect exhaust from the rear and forwardends v of the cylinder.` The valve |9.is thrown in opposite directions by lappropriate meansv the means for throwing thevalve tothepo'sition `foreiectvinder including va port 32,; opening `into the'bore unlgzovered.after the piston 4 has traveled .apredetermined-'desired amount in a rearWar'd'direc-i 'f tion, `the port 324 being connectedby a. passage l33 with the space 34 at the rearward endoi the valvechest. v r Y As the force o the -blow struckwill vary with the timewhen the valve yI9 is thrown into its position vfor interrupting fluid supplyvto the rear end vof `the piston,: it will .be seen that by appropriately varying" the instant-of admissionof throwing uid to theforward end of the valve, 50

` v loe 'accpmplishedr For thek purpose of providing v for this result, I have shown herein three throwingpassag'esj extending through the wall oi the 55 ing admission'to, the 'rearward end of the .cyl-

of the cylinder ata position in which'itl will be y -dilerent periods of admission tothe rear end ofv the vcylinder and diieren't forces-of blow can j spectively, these'passages being spaced apart byv .'30

cylinder `radially at a point just forward of thel forward end of the valve chest. The three passages mentioned are respectively designated 36, 31 and 38, and the outer ends of these passages open into -a b'ore 39 in which there isrotatably mounted an annular valve 4U whose structure will be 'shortly described. The passage 31 is providedwith an VV,enlargen'ient 42 at its inner end.;r

and the rearwardend of this enlargement is uncovered bythe piston 4 on the forward strokey of the latter somewhat before the mouth 32 of the port 33 is covered.v The passage-'38 has at `its innerye'nd a still longer enlargement 43,1and

its rearward end is uncovered by the piston 4 on the forward strokes of the-.latter at a stillfearlierv time. The valve 40 is provided with a peripheral notch which opens at thel peripheryA ofV the valve into communication with the outer ends of the passages '36, 31 and 38, selectively, while'V the notch also lopens through the end'face` 46 of the valve,` andl therefore'- is f communicable selectively withthe outer ends of :passages 41,` 48 ,v and 49 extending through the -end of a valve chest bushing 59 `and lying in the` same radial planes respectively with the ports .-36, 31 and 38 in the cylinder wallfl The y,valve member 4G is' also'provided with a-pair of passages extending obliquely thereinand numbered 5I and 52 re- 'agreater angle than the angular Ydistance between` the passages 48 and 49,` the langle between them being so selected that when the notch i 45 is'xin communication with the port* 31 the passage 5l will be in. communication with the port 49. Correspondingly, when'thev notch 45 is in' communication with` the port 38 the passage 52 lwill be in communication `with the port 48. endsnopen into an annular internal recess 53 inthe valve member 40. The valve member. is

4slidablyr supported on a boss 54- formedl integral withthe liner member 5land houses a spring 55 whichabuts a shoulder v5t at the rearward endof the annular recess 53 and at its forward end `abuts a transversepin A5ly secured in the projecting boss; and said spring normally presses the valve `member 46 ,intol its rearward position. For lthe -purpose of holding the valve `member 45 i. in thedesireddiiferentangular relations, it

is provided witha pin 58 whichis-adapted to cooperate withI dilerent 4ones of threenotches 55, 53 `and A6l suitably formed in thev forward face of-the valve chest member sor ythat the notch 45 may come opposite thehdesired on of the several passages 31, 3S` and 38. The mode oi operation` of thel device will be readily understood from what has been said. With the valve 49 in the position shown in Figs. 1 and 2 and held in that position by engagement of the pin 53 with the notch 6D, it will be readily understood that the motor will operate in an entirely normal manner, the `lvalve being'thrown inarearward directionv to interrupt admission to the rearward end of the cylinder and initiate Vadmission to the forward end of the motor cylinder whentn'e rearward end of the piston uncovers the inner end of the port 36. With the valve 40 in', the position just described, the endV of the valve member 4B will blank olf thegports'48 and 4S. When a lighter blowis desired, the valve member 46 will be retracted against the force of the `spring to withdraw the p'in58 fromthe notch `33 and cause its engagement in the notch 53,'`a`s 'in Fig. 8. This will bring the' notch 45 inthe valve 49 opposite the port 31 and will con-` The passages 5I an-d 52 at theirl forwardA 'means 'including a plurality `of passages having communication-= with the Cylinder-bci'e and .re-

s neet, throughthe notch 45, the port 431 with the passage 243.v

. the passage 43 with the atmosphere (see Fig. 9). i It will be observed that the piston 4 on its for- The passage y5! will then connect ward travel willnow uncover the rearward end of' the enlargement 42 at the inner lend of the throwing passage 31 earlier in the forward stroke of the piston, and accordingly will shift the valve I9 to` eiectrcut-off .for the rear end of the cylinder vand admissicn'to the forward end `oi" the cylinder earlier in the' stroke.

The size of the passage 5l will `oe made such as to` prevent its "having any material 'eflect on the rearward throwing of the valve yI9. Its utility will be appreciated'v'zhen it is understood that upon the "rearward strokes of the piston 4 such as might occur-in drilling' invery l sticky ground, ,a retardation of the piston 4 might' give time, after the` passage32 is uncovered `by,` the forward end of the piston and ybefore therearward end of the enlarged mouth-'42v ofthepassage 31 is covered, for forward throwof the valve 'I9 'and some admission '.throughfthe passage 25 to the rear end of `the vcylinder1 and yback through the passage 42 to .the rfront face of the valve, andcause interference with smooth working of the motor.

When a still shorter stroke is desired,fthe valve 48 will be pulled outwardlyv against vthe pressure of the springb and rotatedato bring the notch 45 `opposite, the passage 38.` This'will cause the earliest vadmission tothe `front end of ,the valve chest, and accordingly the lightest blow. The` danger of iuttering of the valve and irregularity ofv motor operationlwill also-be4 precluded inthis case because-the passage `52 will then come` oplposite ther'port 48-andlbleed`away any pressure which mightentertheextreme 'end of the passage-43, and soprevent its tending to throw the valvein lthe opposite direction. v

From the foregoing 4description it ywill-be observed that I have provided an extremely simple andl convenient' arrangement :for effecting a lvariation in the force'of'blow struck. It will be noted thatethe parts are in convenient position, occupyextrem'elylittle space, are readily adjustable, and not onlyprovide for. the Lnecessary prethrowing, as it:were,of the valve'to effect a reduction z in l Aithe. .force of blow, but also guard against' any fluttering-of the valve and any ir- .regularity of `operation due to the `provision of the facilitiesfor valve throwing..

p and throwingmeansffor said valve .including a vpressure area von said valve'effective .on fluid admission thereto,` to shift said 4valve to aposition -for effecting interruption of admission .to the rear end of the `cylinder and admission yto the forward end ofthe latter and means `for conducting pressure fluid from'the'cylinder bore to rsaid pressure area on said .valve at differenttimes during the forwar'dvtravel of the piston, said spectively initially vuncovered by the pistonk at different times in the forward travel of the l piston, and adjustable means including a rotary 2. Infa pressure fluid hammer motor, a cyl-,

inder having a bore, a hammer piston reciprocable in said bore, a fluidactuated distributing valve, and throwing means therefor including a pressure area on said valve effective on fluid admission thereto to shift said valve to a position for effecting .interruption of admission to the rear end of the cylinder and admission to the forward end of the latter and means for conducting pressure fluid from said cylinder bore to' said pressure area on said valve at different times during the forward travel of the piston, said means including a plurality of passages having communication with the cylinder bore and respectively initially uncovered by said pistonat different times in the forward travel of the pisy ton and adjustable means including a rotary valve member arranged coaxially with said fluid distributing valve for selectively rendering said passages effective upon movement of said rotary valve into different positions, and means 'flor providing a restricted vent for said area made effective when said rotary valve member is in any of its positions for effecting earlier distributing valve throw.

3. In a pressure fluid hammer motor, a cylinv der having a bore, a hammer piston reciprocable therein, a fluid actuated distributing valve, and

throwing means for said valve including a pressure area on said valve effective on fluid admission thereto to shift said valve to a position for effecting interruption of admissionI to the rear end of the cylinder and admission to the forward end of the latter and means for conducting pressure fluid from said cylinder bore to said pressure area on said valveat different times during the forward travel of the piston, said means der having a bore, a hammer piston reciprocable in said bore, a fluid actuated distributing valve, and throwing means for said valve including a pressure area on Said valve effective on fluid admission thereto to shift said valve to a position for effecting `interruption of admissiony to the rear end of the cylinder and admission to the forward end of the latter and means for'conducting pressure fluid `from said cylinder bore directly to said pressure area ongsaid valve at dierent ltimes during the forward travel of the piston, said means including aplurality of passages having communication vvith the cylinder boreand respectively initially uncovered by said piston at' different times in the forward travel of the latter and means for controlling said pressure fluid conducting means including la rotary valve member arrangedcoaxially with said distributing valve and having. passages means communicable selectively with the passages communicating with the cylinder bore upon movement of the rotary valve into kdifferent positions,

' and means for providingra restricted vent for said `pressure area also including passage means .on said rotary valve effective tovent said preso sure area when said rotary valve is in at least one o f its positions for effecting earlier throw of said distributing valve. v

5.,In a pressure fluid hammer motor, a cylinder having a' bore, a `hammer piston reciprocable Ain said bore, a uid actuatedv distributing valve,

and throwing means for said valve including a pressure area on said valve effective on fluid admission theretol to lshift said valve to a posi- `tion for effectinginterruption of admission to the rear end of the cylinder and admission to the forwardend ofthe latter and means for conducting pressure vfluid from said cylinder bore directly to `said pressure area .on said valve at different times during the forward `travel of the piston, said means including a plurality of passages having communication with the cylinder bore and respectively initiallyfuncovered by said piston at different times'in the forward travel of the piston-and Ameans for controlling said pressure fluid conducting means including a rotary valve member arranged coaxially with said distributing valve and having passage means communicable selectively with the passages communieating with said cylinder bore upon movement cf said rotary valve into different positions, and

` means for providing a restricted vent for said pressure area including passage means on said rotary valve for venting said pressure area when said rotary valve is in any of its positions for effecting earlier throw of said distributing valve.

6. In al pressure fluid hammer motor, a cylinl.der having a bore, a hammer piston reciprocable in saidbore, a'fluid actuated distributing valve,

and throwing means for said valve including a pressure area on said valve effective on fluid ad'-l mission thereto to shift said valve to a position for effecting interruption of admission to the rear end of thecylinder and admission to the forward end of the latter and means for conducting pressure fluid from said cylinder bore directly to said pressure area at different times during the forward travel'ofv the piston, said means including a pluralityA of passages having communication with the cylinder bore and respectively initially uncovered kby vsaid piston at different times in the forward travel of the piston and means for controlling said pressure fluid conducting means including a passage with which said plurality of passages are selectively communicable, and means for restrictively venting said pressure area when early throwing of said distributing valve is `to be effected including a vent passage included in said controlling means.`

times during the forward travel of the piston,r

said means including a kplurality of passages having communication with the cylinder bore and respectively initially uncovered by said piston at different times in the forward travel of the piston and means for controlling said pressure fluid conducting means and including a movable valve member arrangedA coaxially with said distributing valve for lselectively rendering said plurality of passages effective, and means for providing a restricted vent for said `area made eiective by said movable valve member when the latter is in at leastone position for effecting earlier distributing valve throw.

8. In a pressure fluid hammer motor, a cylinder having a bore, a hammer piston reciprocable in said bore, a fluid actuated distributing valve, v

and throwing means for said valve including a, pressure area on said valve eiective on fluid admission theretovto shift said valve to a position for eiecting interruption of admission to the rear end of the cylinder and admission to the forward end of the latter and means for conducting pressure iiuid from the cylinder bore restricted vent for said pressure area when said valve is in at least one of its positions for effecting earlier throw of said distributing Valve, said last mentioned means including passage means formed in said movable valve member.`

ELMER G. GARTIN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5305835 *Sep 23, 1992Apr 26, 1994Ingersoll-Rand CompanyNonrotary piston for jackhammer and removable splined nut therefor
US5350025 *Oct 12, 1993Sep 27, 1994Ingersoll-Rand CompanyNonrotary piston for jackhammer and removable splined nut therefor
Classifications
U.S. Classification91/278, 91/296, 91/283, 173/97, 173/135
International ClassificationE21B1/30, E21B1/00, B25D9/18, B25D9/00
Cooperative ClassificationB25D9/18
European ClassificationB25D9/18