US1929420A - Rock drilling apparatus - Google Patents

Description

Oct. 10, 1933. E. G. GARTIN ROCK DRILLING APPARATUS 3 Sheets-Sheet l Filed Dec. 12, 1928 Oct. 10, .1933. E. G. GARTIN 1,929,420

ROCK DRILLING APPARATUS Filed Dec. l2, 1928 3 Sheets-Sheet 2 ,4 mam-rn wgy.

Oct. 10, 1933. E. G. GARTIN 1,929,420

ROCK DRILLING APPARATUS Filed Dec. l2, 1928 3 Sheets-Sheet 3 Eig. 2

@MAW/www' Patented ct. 10, 1933` UNITED .STAT

Roori DRILLiNG APPARATUS Elmer G. Gartin, Claremont, N. assigner-to Sullivan Machinery Company,a corporation of Massachusetts Application December 12, 1928 i Serial No. 325,630

25 claims. (o1. rc1- 19) My invention relates to improvements in rock drilling apparatus.

An object of my invention is to provide an improved streamline design of a rock drilling machine. A further object, is to provide an improved valve mechanism -for a rock drill. Still another object of my inventionV is to provide an improved stopper rock drill of compact streamline design having an 'improved valve mechanism. A still further object of the invention is to provide an improved tubular valve mechanism surrounding the rifle bar in'axial alinement with the hammer cylinder and providing means for 'allowing an unrestricted'flow of motive fluid to the cylinder on its power stroke. Other objects and advantages of the invention will appear dur- Y ing the course of the following specification.

In the accompanying drawings have shown for purposes of illustration two embodiments whichmy invention may assume in practice.

Fig. 1 is a central longitudinal sectional view through a stoper rock drill embodying myrinvention, the ends of the machine being cut away.

Fig. 2 is a view similar to Fig. 1, but showing the moving parts in a diierent position. n

Fig. 3 is a fragmentary sectional view through a Vportion of the valve chest on ,line 3-3 of Fig. 4.

Fig. 4 is a transverse sectional view through vthe valve chest section on line 4-'4 of Fig. 1`.

Fig. 5 is a longitudinal'fsectionalv View of a portion of the mechanism on line 5 5. of Fig. 4 with parts shown in elevation. i

Fig.V 6 is a `fragmentary sectional view through one of the throw passages on line 646 of Fig. 4.

Fig. 'lis a central longitudinal sectional view through a modified form of my invention, showing the same as applied to a drifter type of drill.

Referring to Figs. 1 and 2, there is illustrated a stoper rock drill of generally well known design having a hammer cylinder 1, a feed cylinder 2, an intermediate head member 3,n a valve chest section 4, and a chuck housing, all arranged in longitudinal alinement and held together by suitable side rods which are indicated in section at 6 and 7 in Fig. 4. These side rods are engaged with collars 8 and 9 at their opposite ends, which collars engage shoulders l0 and 11 on the feed cylinder and chuck housing rey spectively. A hammer piston l2 reciprocates in the cylinder l and has a striking bar 13 which is arranged to hammer on a tappet 14 and through this tappet the blows are transmitted to thev shank 15 of the drill steel loosely mounted in the chuck housing. Y

A common type of'automatic rotation mechanism driven by the piston is provided for rotating the drill steel. This rotation mechanism comprises a ratchet and pawl mechanism v16 1,929,420 erica j o mounted' in the head member A3 having a rifle' bar 17 extending forwardly through the valve chest section 4'into a central bore in the piston. A rie nut 18 is threaded into the piston' and has the usual spiral' utes cooperating with spiral lugs on the rifle bar to cause vrelativeloscilla- Y tory movement between the pistonandl rifle bar upon reciprocation of the piston.v The piston is thereby intermittently rotated and this rotative -movementis transmitted by straight cooperating grooves and lugs on the piston extension, 13

and chuck nut 19V secured in a chuck 20 which forms a driving connection withthe drill steel. Instead of,4 the usual reciprocating' valve mounted in arvalve chest projecting laterally from the hammer cylinder, my invention pro.-

Vwith the hammer .cylinder in the section 4 rear"- wardly of the hammer cylinder. This construc- .tion eliminates the large lateral projection neces'- sitated by the usuallateral valve chest and at the same timev provides means permitting a direct axial flow of motive fiuid to the rear end of the hammer cylinder T.on the power stroke of the pis'- ton. The valve chest is provided with a plurality vides a valve chestformed in axial"aline'ment ofbores 21 and 22 in whichare slidably received cylindrical portions or spools 23 and 24 respectively iof the valve. 'At `the forward end ofthe valve chest'the'reare provided two annular inlet `rectly -with the 'rear end of the cylinder through Va large axial'A passage 28, and the forward en d of the cylinder communicates by way of passages 29 and 30, asshown in Fig. 5, withan annular groove `3l in the valve chest, and this groove is adapted to be connected by a groove 32 in the valve to the inlet grooveV 25 when the valve is in the position shown in Fig. 2, the supply motive.

fluid to theforward end of the cylinder. vThe annular groove 311 in'one position ofthe valve is also adapted to be connected to exhaust by the annular groove32 on the valve, which places itl in communication withV theV annular exhaust groove 33 which connects directly to atmosphere through suitable exhaust-ports 34. `A throw lpassage I35, as best Vshown in Fig. 6, leads from the cylinder to the bore 21 inthe valve chest ata L 115 point rearward ofthe flange23. The valve also loo has ashoulder 36 presenting a rearwardly facing area whichis subjected "to constantpressure by means of a constant pressure passage V37 which communicates with the inlet as willbe later-def' scribed. Projecting -rearwardly from `thfejshoulrfa der 36 on lthe Valve is a `tubular extension 33 slidable in a bore 39 so as to guide the end of the valve and seal the constant pressure. chamber. The bore 39 is formed in an intermediate bearing section 40 disposed between the head member 3 andv valve chest section 4. This vrmember forms a suitable support and bearing Afor the ratchet mechanism and rifle bar. The valve is provided with axial bores 41 and 42 in` which the rifle bar is freely rotatable. The valve presents three areas in constant communication with the rear end of the cylinder, namely, the areas on each end of the valve and the area formed by the shoul` der 43 between the bores`41 and 42. One or more central exhaust ports 44 open through the cylin- ,Ld'er wall andform the sole exhaust for the rear end ofthe cylinder and the main exhaust for the front end. Y

Referring now to Fig. 4, motive fluid is suppliedto themachine through a connection 45 at one end of the throttle Valve casing 46 in which is rotatably mounted a conical throttle valve 47. AThis valve is provided with a large axial passage 48 andmean's including a V-shaped groove 49 forconducting motive uid to the large inlet passage 50. This inlet passage is in direct communication with both of the annularinlet grooves 25 and26, a portion of the an'ge 2'7'b'eing cut away adjacent the inlet port. The constant pressure passage 37 communicates directly with the inlet passageV 50 as shown in Fig. 3 and pressure isV thus applied to the shoulder 36 whenever motive fluid is being supplied 'to the drill. Suitable vmeans are also provided to give a constant supvorbuferrmember 55. 4This conducts the live pressure fluid to the straight grooves in lthe striking bar 13 and from this point the iiuid iiows through the grooves to the chamber which is always in communicationwiththe bore in the drillsteel by means of the axial passage 56 in thetappet 14. The usual means. maybe pro-V vided vfor vsupplying also a cleansing liquid to the bore of the drill steel which in this instance comprisesa central liquid conducting tube 5'7 supported inthe back head member and supplied with liquid througha gland member 58 in the usual'rnfanner. The water supply connection is illustrated at 59 and liquid is conducted through the cylinder head member by means of a suitableV passage, a part of which is shown yat 60. Formed on the Valve chest section opposite from the vthrottle valve `is a lateral boss 6l in which is secured the rotation handle 62. This rotation hand le according to common practice is hollow and provided with a lubricant chamber for supplying lubricant-to the machine through a passage 63.

The operation of my improved drilling mechanism will be readily apparent in view of the above description. Motive iiuid is supplied to the linlet passage 50 when the throttle valve is opened and thencgeto the annular inlet grooves 25 and 26. When the parts are in the position illustrated in Fig. .1, iluid under pressureis flowing from the inlet groove 26 to the rear end of the cylinder. The forward-end of the cylinder is at this time yopen to exhaust through passages 29 and Y36, and annular groove 31 and groove 32 in the valve, through annular exhaust groove 33 and exhaust port 34. The hammer piston is driven forwardly and imparts a blow to the hammer drill steel through the tappet 14. On the forward stroke of the piston, when the throw passages 35 are uncovered, pressure uid is transmitted from the cylinder through these passages to the bore 2,1 rearwardly of ange 23 in the valveV chest and since the area thus exposed to pressure is much larger than the opposing areas subjected to pressure, the valve is thrown forwardly to the position shown in Fig. 2. The piston also overruns the exhaust port 44 and most of the pressure uid in the rear end of the cylinder is exhausted through this port. After the pistonA strikes a blow, it will rebound suiiil ciently to uncoverthe supply passages 29 and 30 and pressure fluid is thus admitted to the forward end of the cylinder from the inlet groove 25 around grooves 32 in the valve and 31 in the valve chest to passages 29 and 30. The piston is thus driven rearwardly and during the rearward stroke the ratchet mechanism holds the rifle bar againstrotation anda rotative movement is imparted to the drill steel in a well known manner. After Vthe exhaust port 44 and throw passages 35 are covered on the rearward stroke of the piston, a certain amount of air is trapped in the rear end of the cylinder and this air will be highly compressedrwhen the piston approaches the rear end of its stroke and this compression pressure acting on the forward end of the Valve and shoulder 43 acts to throw the valve rearwardly and again open communication between the supply and the rear end of the cylinder around the end of theY valve. The fluid which has been supplied through the lthrow passages 35 to `bore 21 for throwing the valve forwardly has practically all been exhausted through the exhaust ports 34 as will be readily seen in Fig. 2, and the only opposing pressure' which the compression pressurehas to oppose in throwing the valve is the constant pressure actingon the shoulder 36. The valve is held in its rearward position on the forward stroke ofthe piston by live pressure acting on the end area of the valve and the shoulder 43, and the valve is probably not thrown until this pressure is somewhat relieved by uncovering of the exhaust port 44.

It will be noted that the movement of the valve is limited in both instances by the large annular flange 23 intermediate the ends of the valve. When the valve is thrown rearwardly, this flange abuts against a stop on the member 40, and when it is thrown forwardly abuts against a stop provided by the flange between groove 31 and bore 21. This avoids the necessity of providing end buiers for the Valve and thereby eliminates any obstruction in the axial passage leading to the rear end of theA cylinder.

The general construction and operation of the modication illustrated in Fig. 7 is very similar to that which has just been described in connection with the stopper drill. However, instead of the valve chest being formed in a separate member which abuts against the end of the cylinder, it is formed in a member 64 which is mounted in a counterbore 65 formed in an enlargement of the cylinder. The rifle bar and 'ratchet mechanism are also mounted between iio , pact arrangement.

takes the place of the intermediate head construction and feed cylinderV in the stoper vdrill and the throttle valveis in this instance carriedl partition in the inlet chamber leftout. This shortens the construction to some extent, but

otherwise the operation of the 'valve` mechanism is exactly the same as in thestoper valve construction. The shoulder 36 presenting the rearwardly facing constant pressure area, communicates with the inlet passage '70 by ashort diag- 1 onal passage '73. The other parts of this valve mechanism .and the supply passages are given the samenumbers as in Figs. l to 6 and the operation of the mechanism will not be repeated since it is obviously practically the same asin Figs.

1 to 6. Y

As a result of my invention, vit will be evidentthatI have devised ari-improved streamline design for a rock drilling apparatus employing a tu- `Vbular distribution valve of novel construction surrounding theriebar; that this valve mechanism provides means permitting a direct axial unrestricted flow of motive uid to the-cylinder on its power stroke; -that these desirable features have been incorporated in a novel-stoper construction having a valve chest sectionin axial alinement with the hammer motor in which may be mounted the throttle valve and rotation handle in a com- WhileI have in this application specifically described. two embodiments which vmy invention may assume in practice, it will be understood that these forms ofthe vsame are shown for purposes vof illustration, and that the invention may be modified and embodiedin Various other forms withoutA departing `from its spirit or the scope of the appended claims. Y Y

What I claim .as new and desire to secure by Letters Patent is: l.V In a rock drill, a pressure `fluid actuated percussive motor comprising a cylinder, va piston reciprocable therein, iiuid distribution means for said motor includinga valve chest in longitudinal alinement with said cylinder, a tubular valve reciprocable longitudinally in said valve chest and comprising an imperforate sleeve open from end to end, said valve having an area within-V the interior thereof and facing forwardly and in constant communication with the rear end of the cylinder whereby the valve is thrown in the rearward direction by compression pressure built up in the rearendof the cylinder on thereturn stroke of the piston, means for throwing the valve inthe opposite direction comprising an annular shoulder` on said valve presenting. a rearwardly fac- Aciprocable therein, anduid distribution meansA for said motor including a valve chest in longitudinal alinement with said cylinder and having an annular inlet chamber at one end thereof, ak -longitudinally reciprocable tubular valve in said valve chest having internal bores of different diameter to provide a surface facing forwardly `and constantly communicating with the ,rearward end of said cylinder and a; plurality of ,other radially extending surfaces, said valve chest having a vradially extending partition in said inlet chamber for guiding one-end lof said tubular Valve, and means forfsubjecting said other radiallyextending surfaces to pressurefluid.

:3. In a rock drill, a pres'sureiiuid actuated percussive motor comprising a cylinder, a piston4 reciprocable therein, fluid distribution means for said motor including a valvechest in longitudinal p alinement with said cylinder having an annular inlet chamber at the forward end thereof, said inlet chamber comprising two annular groovesdivided by a'partition, and atubular valve reciprocable longitudinally in said valve chest, said valve tive fluid from said inletchamber to opposite ends of sai-dcylinder, said partition cooperating Awith said end spool toguide the end of said valve. la In a rock dri1l,a pressure fluid actuated percussive motor comprising a cylinder, -a piston reciprocable therein, iiuid distribution means for said motor including a valve chest in longitudinal alinernent with said cylinder having an inlet chamber at the forward end thereof communicating directly with the rear end of said cylinder by a short Aaxialpassage of comparatively large diameter, and a longitudinally reciprocable tubular valve in said valve chestV and comprising an imperforate sleeve open from end to end, said Valve 'having a forward end spool controlling admission of pressure fluid from said inlet chamber to 0pposite ends of thecylinder, said end spool being of Ythe same vdiameter as said passage which leads from the inlet chamber to thejrear endv of said cylinder: andv adapted to be received in said pashaving an end spool controlling admission of rnosage to cutoff supply of motive fluid to the rear end of the cylinder, said valve having at its rear end a sleeve of reduced diameter slidable in a reduced bore Vof said chest and presentinga rearwardly facing area upon which fluid pressure constantly acts. i

, 5. In a rock drill, a pressure fluid actuated percussive motorcomprising a'cylinder, a piston reciprocable therein, means for closing the rear end vof said cylinder including a longitudinally abutting member, fluid distribution means forsaid motor including a Valve chest formed'in said member in longitudinal alinement with said cylinder and having anannular inlet chamber at its kforward end communicating with the rear vend of said cylinder by a relatively large direct axial passage, a fluid actuated tubular valve reciprocable in said vvalve chest, said tubular valve being of greater internal diameter at its forward end than at its `oppositeend whereby a forwardly facizo l surface is provided within the interior of said f valve, and said valve having a forward end spool controlling admission of motive fluid from said Vinlet chamber to opposite ends of the cylinder, meansV for positioning said valve toeifect its different controlling functions, a throttle valve mounted on saidV member adjacent said inlet chamber, anda relatively short direc, radial supsaid inlet chamber. i

In a rock drill, claim 5 wherein there is further provided a radial flangeforming a partition in 4said'ir'ilet chamber forguiding the forward'end of said valve and a portion of said flange being cut away. ,Y g

' 7. A pressure iiuid motor comprising` 'a cylinpli/passage leading from said throttle valve tov Y the construction deiined Vin,

,"der, Va piston reciprocable therein'fluid distribution means for effecting reciprocation of said piston comprising areciprocable differential valve Aarea adapted to be subjected to'intermittent pressure, and means for limitingl the movement of said valve in a forward direction comprising an annular flange disposed intermediate the ends of said valve and a cooperating annular stop flange in said valve chest.

8. A pressure fluid motor comprising a cylinder, a piston reciprocable therein, fluid distribution means for effecting reciprocation of said piston comprising a valve chest in longitudinal alinement with said cylinder, a reciprocable differential valve in said valve chest and comprising an imperforate sleeve open from end to'end, said valve having an area within` the interior thereof and facing forwardly and in constant communication with the rear end of the cylinder whereby the valve may be thrown rearwardly by compression of the fluid which is trapped in the rear end of the cylinder at the time of closing of the eX- haust, and means for throwing the valve in the opposite direction including a rearwardly facing Iarea adapted to be subjected to intermittent pressure and an area disposed rearwardly of said latter area-and subjected to constant fluid pressure. f

9. In a rock drilling apparatus, a pressure fluid motor comprising a cylinder, a piston reciprocable therein, fluid distribution means for effecting reciprocation of said piston comprising a valve chest in longitudinal alinement with said cylinder, a tubular valve reciprocably mounted in saidV valve chest and comprising an imperforate sleeve open from end to endVsaid valve having an end spool for controlling admission of motive fluid to opposite ends of the cylinder, means on said valve presenting a forwardly facing area in communication with the rear end of the cylinder whereby said valve may be thrown by compression of fluid trapped in the rear end of said cylinder, means for throwing said valve in the opposite direction including an annular shoulder adjacent the rear end of said valve, means for subjecting a rearwardly facing area on said shoulder to constant pressure, and a tubular-guiding portion on said valve projecting rearwardly beyond said shoulder.

10. In a pressure fluid motor, a cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect reciprocation of said piston including a valve chest having a valve chamber alined with the cylinder axis, said valve chamber having relatively large and small bores, a fluid supply groove communicating with the smaller bore, a groove communieating with the smaller bore and located between said fluid supply groove and the-larger bore, an automatic fluid distributing valve reciprocably mounted in said valve chamber and having aV large flange fitting the larger bore and a forwardly projecting imperforate sleeve-like portion fltting the smaller bore, said sleeve-like portion having a peripheral groove for connecting said fluid supply' groove and said secondmentioned groove in communication when the valve is in its forward position and for cutting off such communication when the valve is in its rearward position, a passage connecting said smaller bore with the rearr end of the cylinder and communicating with said smaller bore when the valve is in its rearward position to admit fluid from said supply groove to the rear end of the cylinder and Vsaid sleeve-like portion cutting off such communication through said passagewhen the valve is in its forward position, a passage leading from said second mentioned `groove to the forward end of the cylinder for supplying fluid to the forward end of the cylinder when said valve is in its forward position, said valve having a plurality of pressure areas including a pressure area within said valve subjected continuously to the pressure in one end of said cylinder, and means for subjecting others of said pressure areas to pressure fluid to control the positioning of said valve.

11. In a pressure fluid motor, a cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect reciprocation of said piston including a valve chest having a valve chamber alined with the cylinder axis,

said valve chamber having relatively large and small bores, a fluid supply groove communicating with the smaller bore,A a groove communicating with the smaller bore and located between said Vfluid supply groove and the larger bore, an automatic fluid distributing valve reciprocably mounted in said valve chamber and having a large flange fitting the larger bore and a forwardly projecting imperforate sleeve-like vpor- -tionfltting the smallerbore, said sleeve-like portion having a peripheral groove for connecting said fluid supply groove and said second mentioned groove in communicationwhen the valve is'in its forward position and for cutting off such communication when the valve is in its rearward position, a passage connecting said smaller Vbore with the rear end of thecylinder and com'- municating with said smaller bore whenthe valve is in its rearward position to admitfluid from said supply groove to the rear end of the cylinder and said sleeve-like portion cutting off such communication through said passage when the valve is in its forward position, the imperforate sleeve-like portion of said valve surrounding a chamber'having constant communication in allpositions of said valve with said passage, a, passage leading from said second mentioned kgroove to the forward end of the` cylinder for supplying fluid to the forward end of the cylinder when said valve is in its forward position, said valve having va plurality of pressure areas including vthe rear pressure area on said flange, and a pluralityof passages for conducting pressure fluidto said pressure areas for positioning said Vvalve including a piston controlled passage leading from the cylinder to the larger boreat the rear sideV of said flange for admitting fluid from the cylinder to the rear pressure area on said flange to throw said valve into its forward position.

12. In a pressure fluid motor, a cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect reciprocation of said piston including-a valve chest having a valve chamber alined with the cylinder axissaid valve chamber having relatively large and small bores, a fluid supply groove communicating with the smaller bore, a groove communicatingwith the smaller bore and located between said fluid supply groove and the larger bore, an'automatic fluid distributing valve reciprocably mounted in said valve chamber and having a large flange fitting the larger bore and a forwardly projecting imperforate sleeve-like portion fitting the smallsaid smaller bore when the valve is in its rear- 601 is in its forward position and for cutting off such communication when the valve is'in'itsy rearward position, a passage 'connecting said smaller bore with therear end of the cylinder and communicating with said smaller bore when the'valve is in its rearward position to admit fluid from said supply groove to the rear end of the cylinder and said sleeve-like portion cutting off such communication throughlsaid passage when the valve is in its forward position; a passage leading from said second mentioned groove to the forward end of the cylinder'for supplying fluid to the forwardv end of the cylinder when said valve is in its forward position, said valve having a plurality of pressure areas including the rear pressure area on said flange, and a plurality of passages for conducting pressure fluid to said` pressure areas-for positioning said valve including a piston controlled passage leading from the cylinder tothe larger bore at the rear side lof said flange for admitting fluid from the cylinder to the rear pressure area on said flange tothrow said valve into its forward position, said valve being thrown into-'its rearward position` by compression pressure built up in the rear end of the Cylinder during the rearward piston stroke and acting on the forward pressure areas on the forward end ofsaid sleeve-like portion of the valve and within the interior of the latter respectively.

13. In -a pressure fluid motor, a cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect reciprocation of said `piston including a valve chest having' a valve chamber alined with the` cylinder axis, said valve chamber having relatively large and small bores, a fluid supply groove communicating with the smaller bore, a groove Yconnnunicating with the smaller bore and located between said fluid supply groove and the larger bore, an automatic fluid distributing valve reciprocably mounted in said valve chamber and having a large flange fitting the larger bore and a forwardly projecting imperforatef sleeve-like portion fitting Ythe smaller bore,said sleeve-like portion having a peripheral groove for connecting said fluid supply groove land said second mentioned groove' in communication when the valve is vin 'its forward position and for cutting off such'communication when the valve is in its rearward position, a passage connecting said smaller bore with the rear end of the cylinder and communicating with ward position to admit fluid from said supply grcove'tc the rear end of the cylinder and said sleeve-like portion cutting off such communication through said passage when the valve is in its forward position, a passage leading from said second mentioned groove to the forward end of the cylinder for supplying fluid vto the forward end of the cylinder when said valve is in its forward position, a piston Acontrolled passage leading from the cylinder to the larger bore= at kthe rear side of said flange for admitting fluidfrom the cylinder to the rear pressure area on. said flange to throw said valve into its forwardposi tion, and a passage for supplying fluid from the source of fluid supply toa rearward pressure area s 5 on the valve forfconstantly urging the valve toward its forward position. Y

Vlll. Ina pressure'fluid motonacylinder, a piston reciprocable therein, and fluid distribution'k means for said cylinder to effect reciprocationof said piston including a valve chest having a valve .Y

chamber alined with the cylinder axis, said Valve chamber having relatively large and small bores, a .fluid supply groove communicatingwith the smaller bore,V a groove communicating with the smaller ocre and located between said fluid sup'- ply groove and the larger bore, an automatic fluid distributing valve reciprocably mounted'in said valve chamber and having a large flange fitting Vthe larger bore and a forwardly projecting-im-A perforate sleeve-like portion fitting the smaller' bore, said sleeve-.like portionhaving a peripheral groove for connecting said fluid" supply groove and said second mentioned groove in` communication when the valve is in its forward position and for cutting off such communication when the valve is in its rearward position, a passage connecting said smaller bore with the rear end of the cylinder .and communicating 4with said smaller bore when the valve is in'its rearward position toaolmit fluidfrom said supply groove to the rear end of the cylinder and said 'sleevelike portion 'cutting off such communication through saidY passage when the valve is in its forward position, a passage leading from said second mentioned groovetothe forward end of position-by compression pressure built upin the rear end of thepylinderduring the rearward pis-` ton stroke and acting on the forward pressure area on the forward end of said sleeve-likeportion of thevalvefand a passage forfsupply-ing fluid from the source of fluid supplyto Yal rearward pressure area on the valvefor constantly urging the valve toward its forward position.

15. ln apressure fluid motor, aV cylindenla piston reciprocable therein, and fluid. distribution means for said cylinder togeffeotYJ-reciprocation of said'piston including a valve chestA having a Valvechamber alined with the 'cylinder axis, said valve chamber having relatively large and small fluid distributing valvereciprocably *mountedI in said valve chamberA and having a large: flangey fitting the larger bore, and a forwardly projecting sleeve-like' portion'fltting the smaller bore, said. sleeve-like portion. lhaving a peripheral groove for connecting said fluid supply groove and said second mentioned groove in communi-y cation when the kvalve is in its forward position and Vfor cutting off Asuch communication'when the valve is in its rearward position, a 'passage connecting said smaller bore with the rear end of the cylinder and communicating 'with said smaller bore 'when the valveis in its rearward position to admit fluid from saidvsupply groove to the-rear end of the cylinder and said sleevelike` portion cutting off such" coimnunication V through said passage when the'valve -is in its forward position, a passage leading `fromV said second mentioned groove to the forward end of the cylinder for supplying fluid to the forward end of the cylinder when said valve is in its forward position, a piston controlled passage leading from the cylinder to the larger bore at the rear side of said flange for admitting fluid from the cylinder to the rear pressure area on said flange to throw said valve into its forward position, and an exhaust passage connecting the larger bore at the forward side of the flange directly to atmosphere for conducting fluid from i said second mentioned groove to exhaust when said valve is in its rearward position.

16. In a pressure fluid motor, a cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect reciprocation of said piston including a valve chest having a valve chamber alined with the cylinder axis, said valve chamber having relatively large and small bores, a. fluid supply groove communicatdng with the smaller bore, a groove communicating with the smaller bore and located between said fuid'supply groove and the larger bore, an automatic fluid distributing valve reciprooably mounted in said valve chamber and having a large fiange fitting the larger bore and a` forwardly projecting imperforate sleeve-like portion fitting the smaller bore, Vsaid sleeve-like portion providing a forward pressure area and said valve providing another forwardly facing annular pressure area within the interior thereof, said sleeve-like portion having a peripheral groove for connecting said fluid supply groove and salid second mentioned groove in communication when the valve is in its forward position and forcutting off such communication when the valve is in its rearward position, a passage connecting said smaller bore with the rear end of the cylinder and communicating with safid smaller bore when the valve is in its rearward position to admit fiuid from said supply groove tothe rear end of the cylinder and said sleevelike portion cutting off such communication through said passage when the valve is dn, its forward positon, a passage leading from said secondmentioned groove to the forward end of the cylinder for supplying fluid to the forward end of the cylinder when said valve is in its forward position, said valve having a plurality of pressure areas including the rear l pressure area on said flange, a plurality of passages for conducting pressure fluid to said pressure areas for positioning said valve including a l piston controlled passage leading from the cylinder to the larger bore at the rear side of said flange for admitting fluid from the cylinder to the rear pressuresarea on said flange to throw said valve into its forward position, said valve being thrown into its rearward position by compression pressure built up in the rear end of the cylinder during the rearward piston stroke vand acting on the forward pressure areas on the forward end of said sleeve-like portion of the valve and within the interior ofthe latter respectively, and an exhaust passage connecting the larger bore `at theforward sideoffthe flange directly to atmosphere. for conducting fluid from said second mentioned groove to exhaust when said valve is in its` rearward position.

17. In a pressure fluid motor, a. cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect recipro- 'cation of said piston including a valve chest having a valve chamber havingrelatively large and` small bores, a iiuid supplygroove communicating withthe smaller bore, a groove communicating with the smaller bore and located between said fluid supply groove and the larger bore, an automatic fluid rdistributing valve reciprocably mounted in said valve chamber and having a large ange fitting the larger bore anda forwardly projecting imperforate sleeve- Ylike portion fitting the smaller bore, said sleevelike portion having a peripheral groove for connecting said fiuid supply'groove and said second mentioned groove in communication when the valve'is in its forward position and for cutting off such communication when the valve is. in its rearward position, a passage connecting said smaller bore with the rear end of the .cylinder and communicating with sarid smaller bore when the valve is in its rearward position to admit fluid from said supply groove to the rear end of the vcylinder and'said sleeve-like portion cutting off such communication through said passage when the valve is in its forward position, a passage leading from said second mentioned groove to the forward end of the cylinder. for supplying fluid to the forward end of the cylinder when said valve is in its forward position, a piston controlled passage leading from the cylinder to the larger bore at the rear sideof said flange for admitting fluid from the cylinder to the rear pressure area onsaid flange to throw said valve into its forward position, a passage for supplying fluid from the source of fiuid supply to a rearward pressure area on the valve for constantly urging-the valve towardA its forward position, and an exhaust passage connecting the largerbore at the forward-side of 110 thefiange directly to atmosphere for-conducting fluid from said second mentioned groove to exhaust when said Valve is in its rearwardposi tion. Y Y

18. Ina'pressure fiuid motor, a cylinder, a piston reciprocable therein, and fluid distribution means for said cylinder to effect reciprocation of said piston including a valvechest having a valve chamber alined with the cylinder axis, said valve chamber having relatively large and small'bores, a fluid supplygroove communicating vwith the smaller bore, a groove communicating withfthe smaller bore and located between said fluid supply groove and the larger bore, an automatic fluid distributing valve reciprocably mounted in said Valve chamber and having a largeflangeffitting the larger bore and a forwardly projecting imperforate sleeve-like portion fitting the smaller bore, said sleeve-like portion having a peripheral groove for connecting said fluid supply grooveand 130 said second mentioned groove in communication when the valve is in its forward position and for cutting off such communication when the valve is in its rearward position, a passage connecting said smaller bore with the rear end of the cylinder 135 and communicating with said smaller bore when the valve is in its rearward position to'admit fluid from said supply groove to the rear end of the cylinder and said sleeve-like portion cutting off such communication through said pas- 140 sage when vthe valve is in its forward position,A

a passage-leading from said second mentioned groove to the forward end of the cylinder for supplying fluid to the forward end of the cylinder whensaid valve is in its forward position, a 145 piston controlled passagey leading'from the cylinder to the larger here at the rear side of said ange for admitting fluid from the cylinder to the rearpressure area on said flange to'throw said valve -into its'forward'position, said'valve 150 Lega/12o fluid from said second mentioned groove to exhaust when said valve is in its rearward position.

19. In a pressure fluid motor, a cylinder, a piston reciprocable therein, fluid distribution means for said cylinder to effect` reciprocation of said piston including a valve chest'having a valve chamber alined with the cylinder axis, said valve chamber having relatively large and small bores, a fluid supply passage*communicating with the smaller bore at the forward end thereof, a passage communicating with the smaller bore be'-- tween said supply passage and said largerbore for conducting fluid to the forward end yof the cylinder, an exhaust passage communicatingwith the larger bore, a piston controlled passage lead-` ing from the cylinder to thelargervbore atthe rear of said exhaust passage, a passage connecting the smaller bore with the rear end of the cylinder,

and an'automatic fluid-distributing valve reciprocably mounted in said Valve chamber, said Valve comprising a hollow sleeve open from end to end andvhaving an enlarged radial flange adjacent the rear end thereof and a forwardly projectingV` sleeve-like portion, said flange fitting the Vlarger bore and said sleeve-like portiongtting the smaller bore, said valve being thrown into 4its rearward position by compression pressure'built up within the rear end ofthe cylinder during the rearward piston stroke and transmitted tothe forward pressure area on said sleeve-like portion through said fifth mentioned passage and when in said rearward position cutting off corn- `munication of said second passage with said fluid supply passage, opening communication between said second passage and said exhaust passage and opening communication between the rear end of the cylinder and the fluid supply passage through-,said fifth passage, said valve being.

thrown into ils forward position by pressure conducted from said cylinder through said fourth mentioned passage to the rear pressure area on said flangeand when in said forward position opening' communication between said supply pascylinder through said fifthY mentioned passage.

20. In a pressure fluid motor, a cylinder, a,

piston reciprocable therein, fluid distribution means for said cylinder to effect reciprocation of l said piston including a valve chest having a valve chamber alined with the cylinder axis, said valve chamber having relatively large Vand small bores,

afluid supply passage communieating with theY smaller bore at the forward Vend thereof, a passage communicating with the Asmaller bore between said supply passage and said larger bore for conducting fluid to the forward end of the cylinder, an .exhaust passage communicating with'the larger bore, a piston controlled passage leading from the cylinder' to the larger bore at the rear of said exhaust passage, la passage connecting the smaller bore with Vthe rear end of the cylinder, and anfautomatic fluid 'distributingr valve reciprocably mountedin said valve chamber, said valve comprising a hollow sleeve openA from endto end and having an enlarged `.radial flange adjacent the rear end thereof and a forwardly projecting sleeve-like portion, said flange tting the larger bore 'and saidsleeve-like portion fitting the Ysmaller bore, said valve being thrown into Yits rearward position by compression pressure built up kwithin the rear end of the cylinder'during the rearward Vpiston stroke and vtransmitted to the forward pressure area on said sleeve-like portiontlnough said ilfth mentioned passage and when in said rearward position cut-V ting off communication of said second passage with said luidfsupply passage, opening Vcornmunication between said second passage andv said exhaust passage and opening communication between ythe rearend ofthe cylinder and the" fluid supply passage through said fifth passage,

said'valve being thrown into its forward posi'- l tion by pressure' conducted froin'saiolv cylinder .through said'fourth mentioned passage to thel reali' pressure area on said flange and'when in fifth mentioned passage, and a rearward pres-g sure Yarea on said valve. atthe rear of 'said flange and a passage connecting the fluid supply passage with said pressure area for constantly urgingsaid valve toward its' forward position.

2l. In a pressure fluid motor, a cylinder, ak piston' reoiprocable therein, and fluid distribution means for effecting reciprocationrof said piston including a valve chesthaving relatively large and small bores, a fluid supply passage communicating with the smaller bore, a passage communicating with the smaller bore between said fluid supply passagean'd said larger bore for supplying fluid to the forward end of the cylinder, an exhaust-passage communicating with the larger'bore, a passage communicating with the smaller bore for supplying fluid to the rearv end of the cylinder, and an automatic fluid distributing valve eciprocably mounted inthe Valve chestvand comprising a -hollowimperforate sleeve open from end'to end andr having an enlarged flan'ge'iitting the larger boreand a forwardly extending sleeve-like por-- said forwardposition opening communication be-` tion fitting the smaller bore, said` sleeve having Y boreslof Vdifferent diameters to provide a radially extending surface and said bores having constant communication with one end of the motor cylinder, said valve when in itsV forward position cutl ting o Ycorriinunication between said supply passage and said fourth mentioned passage, openl ing communication between said supplyzpassage and said second mentioned passage `andcutting l off communication between said Ysecond mentioned passage and said third mentionedV passage, and said valveY when in itsrearward position opening, communication between Vsaid sup-*- ply passage and the rear end of the cylinder through said fourth mentioned passage, cutting off communication between said supply passage and said secondv mentioned passage and connecting said second mentioned 'passage with said: exhaustpassage, said valve having a plurality of pressure areas, and a plurality of passagers for conducting pressure fluid to said pressure areas 'for positioning said valve.V f Y 22. In a pressure fluid motor, a cylinder, a piston reciprocable therein and fluid Vdistribution means for effecting reciprocation of said piston including a valve chest having relatively large 5 and small bores, a fluid supply passage communicating with the smaller bore, a passage communicating with the smaller bore between said supply passage and said larger bore for supplying fluid .to the forward end of the cylinder, an eX- 10 haust passage communicating with the larger bore, a passage communicating with the smaller bore for supplying fluid to the rear end of the cylinder, a piston controlled passage for supplying pressure fluid from the cylinder to the larger bore, and an automatic fluid distributing valve reciprocably mounted in said valve chest and comprising a hollow imperforate sleeve open from end. to end and having an enlarged flange fitting the larger bore and a forwardly extending sleevelike portion tting the smaller bore, said valve having yin the'same transverse zone with said enlarged flange an internal forwardly facing surface, said valve being thrown into its forward position by pressure fluid conducted from the A cylinder through said fifthmentioned passage` to the larger bore to act on the rear pressure area of saidflange, said valve having a second rear pressure'area, a passage for conductingA pressure fluid tosaid last mentioned pressure'Y area for r.holdingfsaid valve in its forward position, said 'valve being thrown intoV its rearward position by compression built up in the rear end of the cylinder during the rearward stroke of the pistonV `mentioned passage, cutting off communication between said supply passage and said second mers tioned passage and opening Vvcommunication between said second mentioned passage and sai-:ly

exhaust passage.

' 23. I n a pressure uid motor, a cylinder, apiston reciprocablertherein, and fluid distribution means for effecting reciprocation of said piston including a valve chest having relatively large and small bores, a fluid supply passage communicating with the smaller bore, a passage cornmunicating with the smaller bore between said supply passage and the larger bore for supplying fluid to the forward end of the cylinder, an exhhaust 'passage communicating with the larger bore, a passage connecting the smaller bore with the rear end of the cylinder for supplying fluid to the rear end of the cylinder, a'piston controlled passage leading fromfthe cylinder to said larger `hbore, an automatic fluid distributing valve recip- -rocably `mounted in the valvechest and comprising a hollow imperforate sleeve open from end to end and having an enlarged flange fitting the Vlarger bore, a forwardly extendingl sleeve-like portion'tting the smaller bore and a rearwardly -Yextending guide sleeve, a passage for supplying fluid from said fluid supply passage to the rear pressure area on said rearwardly extending guide lchsfnnlcerY and having portions cooperating with sleeve for constantly urging said valve toward itsl forward position, said valve being thrown into its forward position by said constant pressure andV the pressure of the fluid supplied through said fth mentioned passage to said larger bore to act on the rear pressure area of said flange, and said valve beingrthrown into its rearward position by compression pressure built up in the rear end of the cylinder during the rearward piston stroke and acting on the forward pressure area of said sleeve-like portion, said Valve when in its forward position cutting off communication between said smaller bore and the rear end` of the cylinder through said fourth mentioned passage, opening communication between said supply passage and said second mentioned passage and cutting o communication between said second mentioned passage and said exhaust passage, and said valve when in its rearward position opening communication between said smaller bore and the rear end of the cylinder for supplying fluid from said supply passage through` said fourth mentioned'passage to the rear end of. the cylinder, cutting off communication between said supply passage and said second mentioned 100 passage and opening communication between said second mentioned passage and said exhaust passage.

24. A pressure fluid motor including a cylinder,V a piston reciprocable in the cylinder, and fluid distribution means for effecting reciprocation 0f said piston including means forming a' Valve chamber having a y'plurality of bores of different sizes, a hollowvalve reciprocable in said valve said different bores, means for conducting live pressure fluid to said valve chamber, means for kconnecting longitudinally spaced portions of said i,

valve. chamber with an end of the cylinder and an intermediate point in the latter, and a valve having a surface on which line pressure acts continuously, a larger opposed surface formed at least in part within the interior of said valve and on which line pressure acts during admission to the above mentioned end of the cylinder to effect strokesof said piston in one direction, and a still larger surface facing similarly to the first mentioned surface to which pressure is admitted when saidpiston reaches in said strokes said'intermediate point in the cylinder.

25. A pressure fluid motor including a cylinder, a piston reciprocable in the cylinder,v and fluid distribution means for. effecting reciprocation of said piston including means forming a valve chamber having a plurality of bores of different sizes, a hollow valvev reciprocable insaid Valve chamber and having portions .cooperating with said different bores, means for conducting live pressure fluid to said valve chamber, means for connecting the valve chamber to opposite ends of the cylinder and to a point intermediate the endsof the cylinder, and means for connecting the valve chamber to atmosphere, said valve having an outer surface on which live pressure actsr continuously, a larger opposed surface formed at least in part within the interior of said valve and on which live pressure acts at the beginning and' ELMER G. GARTIN.

CERTIFICATE OF CORRECTION.

Patent No. 1,929,420. October 10, 1933.

ELMER G. GARTIN.

1t is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 8, for "stop per" read stoper; and line 105, for "the" second occurrence read to; page 2, line 142, for "stopper" read stoper; page 4, line 1, claim 7, after "valve" insert the words comprising an imperforate sleeve open from end to end and; and page 6, line 45, claim 16, for "positon" read position; and that the said Letters Patent should be read Wi th these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 30th day of October, A. D. 1934.

Leslie Frazer (Seal) Acting Commissioner of Patents.

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