US1473046A - Portable drilling machine - Google Patents

Description

C. L. RAGOT ET AL PORTABLE DRILLING MACHINE Nov. 6 1923.

Filed July 26,

1919 2 Sheets-Sheet 1 INV NTORS. flz W ATTORNEY.

Patented him. 5, 1%23;

UNHTEZQ erases CHARLES L. BAGO'I, 0F NEW YORK, N. L, AND LOUISE. BAGOT, OF MILEQRD, PENN- SYLVANIA, ASSIGNOBS-TO RAGOT MOTOR CORPORATION, A CORPORATION 01 NEW YORK.

Application filed July 26, 1919.

To all whom it may concern Be it known that we, CHARLES L. RAGo'r,

a citizen of the United States, and a resident of Kingsbridge, New. York city, in the :5- county of New York and State of New York, and LOUIS F. RAGO'L, also a citizen oi the United States, and a resident of lllilford, in the county-of- Pike and State of Pennsylvania, have invented certain new and useful Improvements in Portable Drilling Machines, of which the following is a specification.

This invention is an improved portable, drilling machine of that type in which a fluid operated motor is employed for imparting'rotation to the drill or other tool and with which the tool may be fed endwise in respect to the WOli.

Our invention resides primarily in the as construction and arrangement of the tool rotating and feeding means. The main ob ject ot' our invention is to arrange the oper-- ating mechanism co-axial with the tool and with all important. moving as well as stationary partsboth. concentric with the axis and evenly balanced. in all operating positions. As one important feature of our invention, we provide a motor having a plurality of rigidly connected. motive fluid cylinders radially arranged in respect to the axis of the tool and rotatable about said with a feeding means arranged (go-axial with and projecting through the center of the motor whereby symmetry and balance are maintained and the over all length is reduced to the minimum. As a further important feature, we provide an axially dis posed stationary motive fluid distributor which is so designed, when constructed, that it serves as a housing. for or receives a part of'the drill feeding mechanism which is preferably a feed" screw projecting through The locat1on of said tubularthe motor. member inrelation to: the cylinder bases is sucli thata very-small dead space is ob tained, adding tothe efiicien'cy of-the motor. As a further important feature we provide a manuallycontrolled rotatable v sleeve en circling; theqdist ributor, bymeans of which thespeed and-"direction otrotation of the motor may be: controlled. in: its preferred embodiment, speed reducing gearingis em ployed between the-rotorof the motor and thedfirili socket a nd-in our improved connineties: tin-cs earing' as as; the thrust:

PORTABLE DRILLING rancrrrnn.

Serial Ho. 3 13,464.

ball bearings, the feed screw mechanism,

and the drill ejector, are concentrically ara roller carrying spindle disclosed and claimed in our prior l ate'nt 1,302,709 issued May 6th, 1919. As an important feature of our present construction, each spindle carries not only the central roller which engages with an inwardly facin g track but also car. ies two auxiliary rollers, one at each end for engagement with a pair of stationary outwardly facing tracks located on either side of the rotor and constituting means for preventing any piston reciprocation except when accompanied by a corresponding rotation of the rotor. Each cylinder is provided with diametrically opposed longitudinally extending slots through which the corresponding roller spindle extends, said slots also serving to permit or a freer lubrication of the pistons.

Our improved construction als embodies various other features of importance, useful either in connection with motors of the same general type or as important features of drilling or other portable tool operating machines, and which will be pointed out more particularly in connection with a de tailed description 01" one form which our invention may assume.

the accom anying drawings, to whic. rcie once is to he hail:

l a i 1" are sections on ti"; and 5-5, rcs} Jc'tivcly.

v and i igure .1] [it the centerportion oi' the motor in plane indicated by the line tl-fiot Figiced screw mechanisiei being ill) paralusincludes a portable casii hrec superposed 31L illy connected cassections, '10; ii and 12. The upper cas- A .rom the center." in inc specific form 1111 r ted. the ap com-entr-i'c projection-or boss 13', to which ml sectidi.

6 lon ijudinal' section ltlhc an upwardly extending made up.

rigidly secured flange l l'of tubular member extending co-axially intoand substam tially through the casing and serving both as a motive fluid distributor andas a casing for chamber for the feeding mechanism as will be'described more in detail'later.

The casin section 10 is also provided with terior of the'casin'g, access to which may be efi'ecte'd by unscrewing the blind or dead;

handle (not shown) in orde'rto drain or re plenish the lubricant within the casin'g. Socket 17 constitutes .a part of the motive fluid supply passages and is adapted to receive a similar hole through which motive fluid is supplied to feed the motor.-

The, opposite or lower casing section 12 is illustrated as provided here a defending projection or hub 19, concentric therewith,

serving as a guide or bearingforthe ro-- tatable spindle 20 having a socket 21" and m lts upperor inner end a slot 22, shown in'its narrowest dimension in this View, said slot being adapted to receive the tang of the drill or, other tools; A separate bearing sleeve 23 may be, and preferably is employed V-a-nd packingnut 24 retains packing 25 to exclude foreign matter'and retain the oil in the casing.

1 .V\Fitliintlie casing and rotatablyunounted onthe "tubular member '15 is; a rotor illus- 'tra-ted as including a central sleeve or hub portion 26, and a pluralityof radiallydis posed cylinders 27 arranged intwo rows or sets and; rigidly connected thereto. 'There arethe' same number ofcylinders in each row and each cylinder of one row is arranged V parallel with a'corresponding cylinder-of "the other row. Within the cylinders are 7 pistons 28, the pistonsflof adjacent parallel. cylinders being connected by a spindle 29; Eachspindle extendsdiametrically through both cylinders, there being provided oppo-.

sitely disposed "longitudinally extending slots 30-for this'purpose in each cylinder; Each.

1 spindle between the two cylinders carries a somewhat smaller diameter;

"roller 31 preferablymounted on ball bearingsj32and each spindle at eachend carries an auxiliary roller 33 which is -The casing of the motor has three tracks or annular guides with which these rollers the rotor .turns about its axis, thepistons are caused to reciprocate in their respective cyltrolled by the shape and size ofthe annular. tracks or guides. "As shown, these are elliptical and co-axial with the rotor so that each piston is caused to make -four complete Socket 16 is provided working engagement with their respective constituting outlet passages. Either set may 7 serve as inletoroutletpassages, according to the directioninwhich the motortrevolves, V V aswill'be explained 'Each'longitudinalipas preferably of V 7 p r of. ports ell-located sothattheyinay comp. 7

into and out of registry with ea-chZofithe e I ports 38 i of: the two sets of cylinders 27. engage. These tracks are so shapedfthat as;

inultaneorsly; [.Furtlrerm ore, asft-he" two strokes during each rotation of the rotor.

stroke cycle engine, each piston'gives a sin gle power stroke per revolution; The 1no- 'tive fluid operatesat the inner ends of the pistons as will belaterdesc'ribed andItherefore the outer or larger track, that is, theone facingrinwardly is the niost-liablelto wear.

Preferably-there is. provideda mainjtrack or guidefi l'formed asa'separate piece of hardened steelfclampedin place between the two motor casing sect ons l0 and illlwhiclr elliptical asshown"particularly in Figure'llf is V and the rollers iil are maintainedconstantly in'e'ngagementtherewith. The upper casing a section lOris "provided with an inwardly extending rim presenting anelliptical peripheral surfaceserving as a track 35 forthe rollers 33 at one end of each spindle 29- while the'casingisection 11 has an inwardly eX- teiiding'flange 36 presenting an ellipticalperipl'ieralsurface constitutinga track: 37 for therollers 33 at the other end of the spindles. 29. The elliptical t'acks. 35ifand '37 are of 7 such shape and size in respectto, the elliptieal track 33 that the pistons are positively guided in andout as the rotor turns, all lost motion orpounding is prevented and all of the rollers heldatl all times in proper tracks, although a clearance-maybepro rvided so that while the motorisin operation only the rollers 31 will be 'in engagement with their'trackB L i 1 .f j Each cylinder, at its: inner en d, has a port 38 serving alternately as an inlet and nn exhaust-port. =The-,itubular member 15 servesas a motivefluid' distributorto all of: I

the cylinders: Asshown'sit has four longitudinal passages gro'upedginto; two gdiamet 1 rically oppos'ed; sets 39 andflt), QIlQ SG lZ fCGH-T 'stitutnig supply passagesfand theotherset sagef'of the'wtwosetsf39 and 40,;has air throughthe other-portsil of theidistributor -f- 1 so thatTt-he same eyclesfof operationftake.

place. inrthetwoqcylinders-yof each" pair silongitudinalpassagesv of each ,setr are 1' nit-f so latter may be of aluini uim or otherlight material The Inner surface of this track'is V tea-arse ranged 180 apart whenever a passageof one of. the sets comes intor'egistry through its ports 41 with one pair of cylinders, the opposite passage of the same set will come into registry with the opposed pair of Gylijnders and the same step in the cycle of operations will take, place simultaneously at points diametrically opposed in respect to the of rotation.

For controlling the direction of rotation and speed of the motor, there is provided an oscillatory throttle sleeve 42 rotatably mounted on the distributor above the rotor sleeve 26 and within the cylindrical extension 13 oi. the casing 10. Thisexten sion 13 is provided with an annular supply passage 43 surrounding throttle sleeve 42 and connecting with live handle socket 17 through communicating passages 44 and 45, and an annular outlet passage 46 communieating with the atmosphere through openings 47. Throttle sleeve 42- is provided with one pair of diametrically opposed ports 48 registering continuously with annular supply passage 43 and a second pair of diametrically opposed ports 49 registering continuously with annular outlet passage 44, said ports 48 and 49 being situated 90 apart.

The distributor has a set of four radial openings 50 connecting with the two sets of longitudinal distributor passages 39 and 40 and in line with annular supply passage 43. The distributor has also another set of four radial openings 51 connecting with the two sets of longitudinal passages 39 and 40 and in linewith annular exhaust passage 46. The ports 48 are arranged intermediate of the ports 49 and axially spaced from them so that when ports 48 are connecting the annular supply passage 43 with the pair of longitudinal passages 39. through radial openings 50, ports 49 will connect annular outlet passage 46 with the pair of longitudinal passages 40 through radial passages 51.

111 normal operation the motor fluid may enter from the live handle socket- 17 through the passages 44 and 45 to the annular supply chamber 43 and through the ports 48 of the throttle sleeve and two of the radial openings to the two longitudinal passages 39. its the rotor turns the ports 38 of the several cy ders will come into registry with the port. 1 of the longitudinal.passages 39 and thus each cylinder will receive motor fluid twice dining each complete rotation of" theurotor. At the same time, theother two longitudinal passages 40 will be in open com munication through radial openings 51" and throttle ports 49 to the annular ezihaust passage46 and from the latter to the atmosphere to openings 47. Thus-with each complete rotation of eachcylinder it will twice come into registry with the exhaust passages and the; motor. thud-an I The ports.

. ate or rest position as shown in Figure 2, the

of the distributor and ports 38; oi the c 1 der's are, made of such size as to; give tl endesired duration of intake a'ndduration of exhaust. For anon-expansible motivefluid this might, be nearly :for each, but with an expansive fluid any desired cut-ott may be. secured. As shown in Figure 3 the port 38 o l the cylinder which is in a horizontal position. is not in registry with either of the two vports 41 of the distributor and theretor has to rotate approximately through an angle of 8 in either direction in order that ports 38 and 41 will come into registry. This has the efiect of not only having a point of cut-01f at 8 of rotation, but also provides for a motion through 8 of rotation at the beginning of the power stroke before admission of motive fluid is e'flect-ive. This is done in order that the cut-off will be equal no matter in which direction the rotor rotates.

The throttle sleeve 42 may be oscillated through approximately 90, any suitable mechanism being provided for this purpose. As shown, the throttle has an operating handie 52 projecting througha slot in the flange 13 of the casing section 10. lVhenin one extreme position, the motive fluid will enter each cylinder just after it passes the minor axis 01 the ellipse when the exhaust port will open at or about the time the cylinder passes the major axis. By rotating the throttle sleeve to the opposite limiting position, the motive fluid will be admitted to each cylinder at the other side of the minor axis and rotation in the opposite direction will be assured. By bringing the parts to an intermediate position, as for instance as shown in Figure 2, the ports48 and 49 will be brought out of registry with 15353 the radial passages 50 and 51 in the distributor and thus the motive fluid cannot be admitted to or escape from the latter and the motor will be at rest. From the intermedihandle may be moved in either direction and the rotor will turn in the direction toward which the handle is moved at a speed corre sponding to the amount of movement of said handle.

From the foregoing it will be thought that the operation of the motor per so will be sufficiently fully understood, although a more detailed description oi? the operation of a somewhat similarcoi'istruction willbo found in our prior Patent 1,302,709 issued May 6th, 1919.

"For transmitting1motionand power from the rotor to the spindle 20,'and for se' the desired relative speeds, we 1" planetarygearing. 1he loweren po 7 s of .the'rotor isprovided with a dri ing pinion. As shown, the, hub portion .26 is exd -below the lower end-i t the st; W t- 5 'an wiacutt an annular member cut to form an internal gear 55' in the same transverse plane with the pinion'54. The spindle is provided with a lateral flange orhead '56 below the plane of these two gears and this flange or .head' carries a plurality of intermediate gears v57-;mounted in any suitable manner, as for-instance, on hearing pins 58 threaded into the head'56. These intermediate gears '57 mesh with both the pinion 54 or" the rotor and th e stationary internalgear55 of the casing; The rotation of the rotor will cause these intermediate gears to rotate about their own axes and travel along the stationary gear 5 5, thereby efi'ecting thefdesired positive rotation of the spindle 20 at. the desired lower speed than that or the rotor.

Inorder to'take-the'end thrust of thctoo-l,

a thrust ball bearing is mounted between' tlie upper surface of the toolholder head and This is the inner end of the distributor 15: 7 shown as including a pan otrace rings 59 and 60 disposed within the rotor sleeve 26.

The lower race ring may be carried by the p 2 with the inner end of the drill or tool'shank sleeve 20 and the upper race ring by the distributor 15. Both race. rings should clear the rotor sleeve in order not to makeco t with the latter.

For feeding the tool into the work, there I stituting feed post 61 is disposed entirely within the distributor and at its inner or' lower end, has an outwardly extending flange 62 rigidly secured to the inner end of the distributor '15 and if desired disposed between the'latter andthe thrust bearing race ring 60. Feed postGl is, externally threaded so that the outer member or sleeve-63 which is internally threaded may be-screwed on to noted, constituted" a casing for the feed mechanism. The out-er end of the feed sleeve 63 may be constructed in any suitable manner for engagement with a stationary support and may be provided with any, suitable means to facilitate the rotation of said mem-.

ber. As shown, feed sleeve 63 has a pointed outerend 6a which maybea separate hardenedinserted piece and is provided with a suitable handle 65 to facilitate its rotation.

it will be "noted that" the} entire I end thrust 'otthe drill or toolis transmitted from the spindle 2O throu'ghthe thrust'be'a'ring to the fiangej62bt the feedpost I61 and'from the latter-tothe feed sleeve (Bend the station m support (not shown) 2;: Thu's none of .the, thrusts directly sustained-by the distr1bu-' tor. or the? motor casing, and therei'ore "the casing anddistributor may be madeof coma paratively light material, 'altho'u ghthedisf e .tributor itself should be of such material'as 'willprovide a suitable bearing for the rotors It-will be noted that one of the two-threaded members constituting the screw'flfeedis rigid and dintfand'areconcealed from view. It

willfbe evident that if desired it may be the 7 inner of the two threaded members which is to. be movable into and out of the casing,

and in that event, the distributor itself may beinternally threadedand serve not only as the distributor but also as one of the two threaded members of the feed screw.

* For removing the drill or 'tool'i'rom the.

socket '21'there is provided a pin 66. slidably mounted within and coaxial with the .ieed post 61. -The lower end of this pin may project through the ball thrust bean.

ing tosuch a position that it may engage and force the latter out of the socket ot the spindle 20. ,Forforcing this pin'fendwise and for normally preventing the pm; from falling out when the tool is removed,

the upper or inner end'of the; pin may. be 1 provided with a head '67 above the upper end of the feed post 61 and withinthe' feed When the latter'is screwed in,

sleeve :63. nearly to ts limlting position, a transverse wall or stop' will engage with the head of the pin and force the latter downwardly a su'lficientdistance to dislodge the tool. The feed sleeve 68 must be screwed outagain to a slight extent: topermit the proper reinsertionof the tang of the tool. Owing to more, if the device is used to drive atool not requiring ejection the distributor may,

be left with a solid center.

It" will be noted that in our improvedconstruction, 'therotor of the motor is coaxial -with the toolsocket'an'd that the entire 'niechanism is balanced and; symmetrical.

The radial movement of each piston is accompanied by acorrespondmg but opposite movement of a'diametrically opposed piston and the'samestep in the cycle of operation takes place simultaneously in diametrically opposed cylinders Themotor is so coo structe'd'that .the feed; mechanism operated directly through the center of the motor and the casing; or housingof the vfeed screw mechanism 'se'rjves as a motive-"fluid "distrib utor and "has ajournal or bearing for the rotor. The parts most liable to Wear, such as the elliptical guide 34 and the annular gear are formed separately from'th casing'and are ri'gidly secured position upon the-assembling 'ot the casing so-that they cannot become displaced or loosened. The rp'arts are sol'designed that they may be very readily removed or replaced and the moving parts'may be readily lubricated.

The mechanism may be employed for .opcrating any kind of rotary tool :tor'use on any'variety'otwork, suchas wood, or metal. In designating the invention a portable drilling machine, it will 10f course be evident'that such 'termis used in its broadest :meaning and includes reaming, tapping, counter-sinking, and other operations performed by a-rotary tool, the character of the operation depending upon the particular toolzselccted. Any suitable motive-fluid may be employed, such as compressed air, steam, water or explosive 'mixture. It will of course be evident that the arrangement and sizes ofthe portsmust be properly designed in accordance with the motive fluid to be employed.

Having thus described our invention, what we claim as new, and desire to secure byLetters Patent, is:

1 Ina port-able drilling machine, a tool holde1', -a fiuidoperated .rotorcoaxial there- 'with and having a plurality .ot' cylinders with their-axes disposed radially in respect .tosaid .tool holder, speed reducing gearing connecting said rotor and said tool holder, and screw feed mechanism extending axially through said rotor.

f2. 1n aportable drilling machine a rotary .fiuid operated motor,.a tool holder coaxial therewith, speed reducing v-gearing connecting said motor and said tool holder, a stationary motive fiuid distributor extending axially through said rotor, and screw feed mechanism disposed within said distributer.

A. portable drilling machine including a'rotarj fluid operated motor, tool holder coaxial therewith, speed reducing gearing 'connec'tingsaid"motor and said tool holder, a: stationary motive fluid 'distributer extend ingiaxially through said rotor, and a sleeve mounted for oscillation on said distributer for controlling thetlow of motive iiuid to the latter.

A portable drilling machine including a casing having a cylindrical extension at one end thereof, a tubular-motive fluid distributing member coaxial with said casing and secured tosaid extension, an oscillatory throttle sleeve within said extension and encircling :said distributer, and a motive fluid operatedrotor mounted for rotation on said distributor.

'5. A portable dri'lling machine including a casing having-a cylindrical extension at oneend thereof, a tubular motivefluid distributing member coaxial with said "casing and-secured to said extension, and oscillatory throttle sleeve within said "eXtension and encircling said distributer, "a motive fluid operated rotor mounted for rotation on said distributer, a tool holder coaxial with said distributor and a tool ejector movable axially through said distributer.

6. A portable drilling machine'including a casing having a cylindricalextension at one end thereot,a tubular motive fluid distributing member coaxial with said casing and secured to said-extension, and'oscilla't'ory throttle sleeve *ithin said extension and encircling said distributor, a motive tluid operated .rotor mounted for rotation on said distributerg-and iced screw mechanism disposedwithin andaxially movable in respect to said distri'buter.

'7. In combination, a rotary fluid operated motor, comprising a plurality of radially disposed cylinders, a tool holder co-axial therewith, speed reducing -'gearing connecting said motor and said tool holder, a stationary motive fluid distributor extending axially through said rotor and screivfccd mechanism disposed within said distributor.

8. In combination a rotary fluid operated motor having a stationary tubular motice fluid distributor and arotor comprising a plurality of radially disposed cylinders mounted thereon, a tool holder coaxial with said distributor, and planetary gearing connecting said rotor and said tool holder, and screw feed mechanism disposed within said distributor and extending axially 'beyond the ends thereof.

9. A portable drilling machine, including a rotary fluid operated motor having a stationary tubular motive'tluid distributor and a rotor comprising a plurality of radially disposed cylinders mounted thereon, a tool holder coaxial with said. distributor, planetary gearing connecting" said rotor and said tool holder, and mechanism "operating within saiddistributor for feeding said' rotor and 'said'tool holder axially, said mechanismextending axially tfromendto end ot'said distributor. v

10. In a portable drilling machine, astationary tubular motive fluid distributing memberya tool holder-coaxial therewith, a thrust bearing between said member and said tool holder, a fluid operated rotor having a plurality of cylinders -'11l0l1l1t8l on and radial in respect to said tubular member, and a casing enclosing said rotor-and secured to said member and providing a-bearingtor said toolholder.

11. A portable drilling machine including a stationary tubular motive fluid distribut-. ing member, a tool holder "coaxial therewith, a thrust bearing between said member and 'saidtool holder, a'tlui'd operated rotor financier comprising a plurality of radially disposed cylinders rotatably mounted on said ll-U131 lar member, and a; casingenclosing said rotor and seoured'to said member and providmg a bearmg for sald tool holder, said tubular member having two diametrically (opposed pairs of axially disposed passages therethrough, one of said pairs being for the deliveryjof and-the other oisaid pairs being forthe j collecting of motive fluid to and fromsaid rotor respectively.

a 12. A portable drillingmachine including 1 a stationary tubular motor fluid distributing member, a tool holder co-axial therei'vith, a

thrustlbearin'g between said'member and sa-id tool holder, a fluid" operated rotor comprising-a plurality of radially disposed cyl inders 'rotatably' mounted on said tubular member, acasing enelosingsaid rotor and secured to said member and provid'inga bearing forsaidtool holder, and escrow member extending axially through said rtubular imember for engaging a stationary support and rotatable to axially'feed the rotor andtool'holder; I i a 13'. A portable drilling machine, havinga stationary tubular motive fluid' distributing member, 7 a fluidoperated rotor mounted thereon, a tool holder coaxial with said member, a thrust bearing between said tubular member and said tool holder, a casing enclosing saidrotor and providing a bearing V for said tool holder, and a] threaded. mechanism operatively' 'connected'to and axially extending through said tubularmember and telescoping therewith, and rotatable to effect the teeding'ot said. casing and tool axially. MIA portable drilling machine, including a tool'hol'der, av member co-axial therewith, a thrust bearing between said tool holder and said member, a second member having threaded engagementwithsaid first mentionedmember for feeding said tool holder and'said first mentioned member axially, a stationary tubular motive fluid distributor surrounding said members and rigid with said first mentioned member, a fluid operated motor rotatably mounted on said distributor and encircling said memrigid with said first mentioned" member, a

fluid operating motor rotatably mounted on said distributorand encircling said members said motor having radially disposed cylinsaid distributor ders, a casing rigid with said distributor and onclrcling said motor, and-speed reduc ing gearing connecting" said rotor andj said tool holder; V V 7 V 169A portable drilling machine, includ; ing a stationary 'tubular motive fluid dis holder, speed reducing gearing, connecting said rotor and said, tool holder, and feed screw mechanism for said tool holder within and extending axially there through.

.tributor, a rotor mounted thereon, a tool 1 .17. 'In a ortable 'drillin machine, a as tubular motive fluid distributor, a rotary b fluid operated motor rotatably mounted thereon, a tool holdermountedaxiallytherea with and connected to said motor by speed reduclng gear1ng,:'a-screw operated feeding mechanism extending therethrough, said mechanism havingla stationary memberse-.

cured to the inner end and a rotary telescop ing member emerging from the outer end of said distributor andmeans extending axially through said stationary member for-engagement witlrsaidtelescoping member for ejecting tools from said toolholder';

18-. In combination, a casing-having a cylindricalextension atone end thereof," a j 'tubularmember co-axial with saidcasing and secured to said, -cylindrlcal' XtGIlSlOIl,

an oscillatory throttle sleeve Within; said extens on and encircling said tubular meme her, a motive fluid'operated rotor mounted on sa d tubular member, supply 'andexhaust passages extending lengthwise through the walls of I said tubular im'ember, annular supply and exhaust'passages within'said cylindrical extension, and ports 1n said throttle sleeve for establishifn'gg, communica tion between either of said firstlmentioned passages and either of said second mentioned passages tocontrolthe rotation ofsaid rotor;

' 19; Axportable drilling machine, includa ing a casing having motive fluidsupplyg-and 1 exhaust passages, afltubular member co-axial and rigid therewith andjhaving four l0ngi- V tudlnally extendlng motive fluid passages within the'wallsathereot arranged in. two

sets o-f'diametrically opposed pairs, 'arotor and an OSCJllMZOI'y SlQGVG mounted. on said I member and axially spaced from eachfother,

radial ports in saidtubular member, rotor and sleeve, the ports-in said sleeve being disposed to connect the. casing sup ply passage with either of said pairs of tubular member passages, and said casing exhaust j zo passage with the remaining pairof tubular member passages: when saidsleeve is manually. oscillated 1n elther direction,

j 20, .A portable ,.dri ling machine, includ ing a casing having motivefluid supply 7 and exhaust passages, a tubular member c0- axial and rigid therewith, a fluid pressure operated rotor and --an oscillatory throttle tubular member passage to the source of supply and the remaining tubular member passages to the atmosphere, said throttle W being manually oscillated through an arc of suffieient magnitude to reverse the relation of the throttle ports to the tubular member passages in order toreverse the flow of motive fluid through said rotor.

Signed at New York, in the county of New York and State of New York, this 24th day of July, A. D. 1919.

CHAS. L. RAGOT. LOUIS F. RAGOT.

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