US1019521A - Pump. - Google Patents

Description

o. R. PRATT.

PUMP.'

APPLIUATION FILED Anda, 19104 Patented Mar. 5, 1912.

3 SHEETS-SHEET 1.

- Ammer. y

C.R.PRATT.

PUMP.

APPLIOATION FILED 113.18.191m

Patented Mar. 5, 1912.

3 SHEETS-SHEET Z.

INVENTOR WITNEssEs H y m M m M -hzmh m Mm C. R. PRATT.

PUMP.

APPLICATION FILED APB..18, 1910.

Patnted Maf. 5, 1912.

W/TNESSES To vall 'whom it fmay concern:

, UNITED sTATEs PATENT oEEIoE.

CHARLES R. PRATT, F MONTCIJAIR, NEW JERSEY, ASSIGrNOlRa BY DIRECT AND HESNIE ASSIGNMENTS, T0 THE UNIVERSAL-,SPEED'CONTROL COMPANY, A CORPORATION 0F NEW YORK.

PUMP.

Be it known that I, CHARLES R. PEA'1"1 a citizen of the Unitedv States, resldmg at Montclair, in the county of Essex andtate of New Jersey, have invented certain Improvements in Pumps, of which the follo-wi ing-is a Specification.

'The objects of this invention are to provide improved means for transmitting motion from one fluid under pressure to another; to` thisend to provide for each luid a rotary barrel with annular series of pistons and means for co-nnecting the pistons of one barrel to those of the other; to so connect said pistons that they reciprocate rel; tolprovide means for rotating the barrels in unison; to provide means for restricting the motion of said pistons resulting from their reciprocation and the rota-- .tion ofthe barrels to an elliptical path; to

enable such path to be varied on either' side of .a middle plane in which there is no reciprocation of the pistons; to cause the pumped fluids to move in continually forward directions and reduce loss of power from inert-ia yand friction; to avoid corners and obstructions such as break up a current of fluid being pumped'; to avoid the use of numerous valves; to obtain maximum efficiency; to secure a simple and compact construction, and to obtain other advantages and results as may be brought out in the following description.

Referring to the accompanying drawings,

' in which like numerals o-f reference indicate y which the end portion and body of certain barrels are secured together, Fig. 3 is a View of the power end of my lmproved pump j with the end plate in section on line C-C of Fig. 1.; Fig. 4 is a view of thel work end of my improved the end plate being in section on line D-D of Fig. 1; Fig. 5 is a side view of a certain controlling disk, and Fig. 6 is a view Ysimilar to the middle part of Fig. 1, illustrating a modified construction which -enables the angle of inclination of the controlling disk to be varied.

vSpecification of Letters atent. I i Application mea Apm 1s, 1910. serial No. 556,096.

In said drawings, 1 indicates the casing Patented Mar. 5, 1912'.

of my improved-pump, said casing being substantially cylindrical as shown and di-v bearings 8 and 9 provided therefor inthe end plates 5 and 6, respectively, and' upon drical casing l with its opposite ends in l this shaft are mounted barrels 10' and 11 I each having an annular series of piston cylinders which are open at their ends toward the other barrel and have inlet and outlet ports at their opposite ends next the adjacent end plate of the casing. The -cylinders of the barrel 10 at the power end of the pump are marked with reference numerals 12, while those of the lother barrel 11 at thelworkend of the pump are marked' with reference numeral 13, and in the cylinders 12 are pistons 14, while the pistons in the cylinders 13 are marked 15. The said barrels 10 and 11 are keyed upon the shaft .7 with their cylinders in alinement with each other, that is to say each cylinder 12 being in central longitudinal alinement with a cylinder 13. The pistons 14 and 15 in each pair of alined cylinders are furthermor`e connected,l which connection I `have shown in the drawings effected by rods 16 and 17 having their adjacent .ends secured to a transverse disk 184 arranged across the chamber of the cylinder casing 1 between the barrels 10 and 11.

The ends of the cylinders k12 away from the disk 18 bear against the end plate 5 and have ports 19 opening out throughv said bearing surface. The end plate 5 has in its face next the cylinders 12 inlet and outlet ports 20 and 21 which extend alongarcs ofthe circle in which the ports 19 of the cylinders 12 are disposed, being long enough to communicate with two or three cylinders at the same time, as shown'in Fig. 3. The

inlet port 20 of theend plate 5 isin communication with a pipe 22 for supplying pressure fluid, and the other port 21 has through gear teeth 24 at its center meshing with other gear teeth 25 on a hub 26 fast upon the shaft 7, to said shaft, and said shaft being keyed tothe barrels 10 and 11` as before stated, said barrels and disk all rotate in unison.l Such rotation 'brings the port 19 of each cylinder 12 into alternate communication with t-he inlet 20 and outlet 21 of the pressure fluid supply, as will be understood. I

The ends ofthe cylinders 13 away from the disk'18 bear against the end plate 6 of the. casing and have ports 27 opening out through said bearing surface. The end plate 6 has in its face next the cylinders 13 inlet and outlet ports 28 and 29 which ex-I tend along arcs of the circle in which the ports 27 of the cylinders 13 are disposed, being long enough to communicate with 4'two or three cylinders at the same time, as shown 1n` Fig. 3. The inlet port 28 is in connection with a supply pipe 30, and the other port 29 has leading from itself a discharge pipe 31. This is the working or pump end of the casing, and as the barrel 11 turns its pistons 15 will draw in a fluid through the supplyv pipe 30 to force the same under pressure into the discharge pipe 31. A fpressure' fluid,y as steam. applied at the power end of my improved pump will therefore enable another iuid, such` as water, to be pumped at the 4other end of the device.

It will be understood that the two barrels -1() andvll seat at their opposite ends or ends having ports, against the end plates 5 and 6, and said barrels are suitably spaced .upon the center shaft 7 to secure the requisite contact for such seating.- This is done by having a nut 32 upon a threaded portion 33 of the shaft 7, said nut being located in a cavity 34 of one of the barrels as 11 and adapted to 'abut against a shoulder of said barrel to hold it away from the other barrel, as clearly shown in Fig. 1. This nut 32 can be adjusted by taking out the llister head screws 35, shown in detail Fig. `2 so that the end portion 36 of the barrel can 'be slid away from the portion .37. Furthermore, the nut 32 has an annular series of holes 38 any one of which ma receive a pin 39 -on the end portion 36 o the barrel when the latter is in place, to serve asa nut-lock. v

The casin v1 can obviously be supported in any suita le mannen desired, but I have shown it provided with feet 40 for purposes of illustration. In the operation of the device said casing is preferably filled with oil. For convenience, the cylindrical casing 1 may be divided transversely on the slanting vpiston rods 55 and 56 each alined l. 1, and said disk preferably rotates in ba bearings 4'1 and thrust bearings 42 to reduce friction. At the center of the disk are the gear teeth 24, -above described, and between said center and Jthe periphery of the disk .is an annular series 4of seats for the pis- ,im in which the disk is lies', as Shown in ton rods, as shown in Fig. 5. Each of these seats comprises vbushings 43, 44, which form a concave seat for the outside surface of the cuplike ends 45, and 46 of the pistons 16 and 17. These cup-like ends inclose a solid steel ball47 surrounded by Babbitt metal 48 orV the like, and said cup-shape en form outwardly as pherical surface bro en only by the projectlng pistons and b the encirclin crevice 49 which allows a'sllght bendin o the piston rods with respect to each ot er."

This bending is caused by each point of connection of piston rods to the disk 18 traveling in an ellipse and not a true circle, because of the incline of the disk.

The purpose of the disk 18 is to cause the pistons to travel regularly in the same elliptical ath in afixed plane, when the controlling isk is in oblique relation to the axial shaft, and obviously if it were not employed each iston as soon as it received the pressure uid would move longitudinally its entire stroke, then turn ina plane at right an' gles to the shaft 7 until it reached the pointv of exhaust when itiwould moveoutward for its entire stroke. VFurthermore, the disk 18 serves as a convenient means for rotating the barrels l0 and 11 in lmison, which rotation is essential to the operation of the device, and wouldnot be sov easily or accurately obtained in any other way.

Obviouslythe angle of inclination of the disk 18 to the shaft 7 determines the length of stroke of the pistons, and by arranging said disk so that it can be tilted to change suchI angle the len h of stroke and consequently the work one by the pump can be varied at will. Furthermore, by tipping the glpiding disk past a point at right angles to t e shaft 7 into an inclined position on the other side of said plane, the direction of pumping would be reversed as well as the umping varied. I have shown asat 50 and 'containing in its chamber barrels 51 and 52'upon a `center shaft 53. These barrels have pistons, one of which in a barrel 52 is shown at 54, and said pistons have air of which connect to the controllin dis 57 in the same manner already described in connection with Figs. 1 to 5 inclusive.V This controlling disk 57 is mounted in a carrier 58 upon .ball bearings 59 and thrust bear- -ings 60, and this carrier is adapted to tip from a vertical position both backward and forward upon horizontally projecting trun nions 61 at its opposite sldes which find bearings upon the casing 49. Said casing 49 is-shown bul ed at and adjacent to the connection 50 o its sections, to permit the controlling disk to tilt, although of course this might be avoided by makmg the c linder larger. n One ofthe trunnionsl of t e: carrier 58 projects through the wall of the casf ing 49 and has fast upon itself a radial arm 62 provided-'at itsA outer end with a rack 63 extending in an arc of the circle of which said arm is the i-adius. A screw 64 mounted in any convenient manner, as upon the outside of the casing 49 to be turned without longitudinal movement by means of 1a han dle 65, engages said rack 63 to swing ,the arm 62 and thus thecontrolling disk. By this means the length of stroke of the pistons can be Varied and also the direction of pumping reversed without changing the vdirection of pressure fluid supplied to the dev1ce.

At its center the controlling disk 57 is mounted upon theshaft 53 by means of a universal joint consisting of a collar 66 fast upon the shaft 53 and having opposite trunnions 67, 67 on which a sleeve 68 is pivoted, said sleeve 68 in turn having trunnions 69 in a diametric line at right angles lto that of the trunnions 6I, which trunnions 69 support the annular controlling disk 57.

Preferably the pressure Yfluid-supply pipe 22 is provided with a throttle valve 70 which is controlled by a pumpgoverning valve 71 which Vis connectedby a pipe 72 with the discharge end of the` device or pump, acheck valve 73 heilig also placed in the pump-discharge beyond the said pipe 72. "Any suit able and well-known construction of governor may be employed, and-I have merely shown for purposes of illustration a cylinder j 74 into which the p-ipe 72 opens so that the pressure thus admitted will force a piston 75 backward against the power of a-spring 76 to hold the valve 70 open, the rod ,'77 of said piston being coniiectedto an arm 78 of the valve stem." .In case the pump should losev its suction, for instance, or pumping.

should cease, the check valve 73 sustains the pressure already pumped up and the spring 76 moves the p-iston 75 to close the throttle valve 70 and shut oil the supply of pressure fluid.

By my improved construction, the pressure of a pressure fluid is transmitted directly through pistons moving in an elliptical path to act directly upon another fluid to be pumped, and there is thus theleast possible loss of energyby transmission.' It

` should be noted in this connection that the in oblique relation to the axial shaft. Fur;

thermore, in my improved pump there is no reciprocating movement ,given to either the pressure fluid or pumped fluid, such as there 1s in a reciprocating pump, nor, any beatingk or churning of the fluid as in centrifugal .pumps and the like, butthe fluid moves in`^ a continuously forward and uninterrupted flow along a path through the pump as free from .friction as a large .radius elbow. Again, I have avoided the use of valves and the consequent loss by wire drawing through them, andA yet at the same time I secure a posit-ive piston action, the result being that I obtain great efficiency and increased output per size, weight and cost of plump units.

The speed of the steam pistons should exceed the speed of the water pist-ons in order to obtain the greater possible efficiency, and

it is also often the case that the Walter presalinement with the water pistons nor con-A nected to the `disk one opposite another, as

in the preferred construction, but such opposite relation is subordinate to the'necessity for steam pistons of required area.

aol

'Having thus described the invention, what I claim is: f, *f

1. In a pump, two barrels in axial alinement each having an annular series of cylinders, lfluid inletand outlet means at one end of each barrel for the cylinders thereof. a controlling disk arranged between said barrels, pistons in the cylinders having rods projecting at the other ends of said barrels from the fluid inletV and outlet means andA connected to said 'controlling disk, means for supplying fluid under pressure to one of .said barrels, and means for holding said control- V ling disk in oblique relation to the axial line of said barrels.

2. In a pump, 'two barrels each having an annular series of cylinders, fluid inletand outlet means for said cylinders at one end of each barrel, a controlling disk arranged between said barrels, pistons in the cylinders having rods projecting from the other ends of said barrels from the said fluid inlet and outlet means and connected to said controlling disk, means for holding said controlling disk in a plane oblique to the axial lines of both barrels, and means for supplying fluid under pressure to one of. said barrels.

3. In a pump, two barrels each having an annular series of cylinders, fluid inlet and outlet means for sa1d cyllnders at one endfof each barrel, a controlling diskl arsaid controlling isk ina plane oblique to the. axial lines of both barrels, means for causing said barrels to rotate in'unison, and

means for supplying to one of said barrels. y

. In a pump, two barrels each having 'fluid under pressure an annular series. of cylinders, iuid inlet and outlet-means for said cylinders 'at one` end of each barrel, a controlling disk arranged between saidbarrels, pistons in the cylinders having rods projecting from the other ends of said barrels from the said iui'd inlet and outlet means and connected to said controlling disk, means for holding said controlling disk yin a plane.) oblique to the axial lines of both barrels, means for rotating said barrels A,from said `controlling disk, and means for su plying iuid under pressure to oneA of said harrels.

5.. In a pump, two barrels infxial alinement each having anannular series of cyl-y inders, fluid inlet and outlet means for said cylinders at one end of each barrel, pistons in the cylinders having rods projecting from the other ends of said barrels from said inletv and outlet means, means for supplying vHuid under pressure to one of said barrels, and means 'connecting the piston rods of one barrel to those of the other and adapted'to guide them in an elliptical path around the axis of rotation of 'said barrels.

6. In a pump, two rotary barrels. each having an annular series ofcylinders, li'uid inlet and outlet means for the cylinders of each barrel at one end thereof, pistons in the cylinders having rods vprojecting from the other ends of said barrels from said inlet andoutlet means, means connecting the piston rods of one'barrel to those.l of the other, means for supplying fluid under pressure to one of said barrels, and means for varying the stroke of all said pistons simul taneously.

7. In a pump, two rotary ,barrels each having an annular series of cylinders, fluid inlet and outlet means for the cylinders of each barrel at one end thereof, pistons in the cylinders having rods projecting from the other ends of said barrels from said Huid inlet and outlet means, means connecting the piston .rodsof one barrel to those of the other, means for rotating said barrels in unison, means for supplying iiuid under pressure to one of said barrels, and means for varying the path'of said pistons aroundv the axis of rotation of the barrels from a circle to an ellipse in either direction, whereby the 8. The combination of two barrels each having an'` annular series of cylinders, fluid inlet and outlet means for the cylinders of /each barrel independent of the other barrel, pistons inthe cylinders, means connecting said pistons in pairs each pair consisting of one piston in each barrel, and means for rotating the barrels'inunison.

9. The combination of two barrels each having an annular series of cylinders, fluid inlet and outlet means for the cylinders of each barrel independent 'of the other jbarrel,

means for supplying fluid under pressure to one of said barrels, pistons inthe cylinders, means connecting sald pistonsin pairs each pair consisting of pistons one in each barrel held end to end, means for rotating the barrels in unison, and means for guiding said pairs. of pistons in elliptical paths as the barrels rotate. A Y

10. The' combination oftwo barrels each having an annular series of cylinders, uid inlet 'and outlet means for the cylinders of each barrel independent of the other barrl, means for supplying fluid under pressure to one of said barrels, pistons in the cylinders, means connecting said pistons in pairs eachapaii,` consisting ofone piston 'in each tbarrel, means for rotating the barrels in unison, and means for varying the stroke of all said pairs ofpistons simultaneously.

11. The combination of two barrels in axial alinement each having'an annular se- -12. The combination of two vbarrels in Y axial alinement each having an annular series of cylinders, luid inlet and outlet means at one end of each barrel independent of the other barrel, pistons in the cylinders, means connecting said pistons in pairs each pair .consisting of one piston in each barrel,

Vmeans for rotating the barrels in unison, and means for varying the path of said pairs of pistons during rotation from a circle to an ellipse in either direction, whereby the direction and velocity of the fluid pumped is varied,

13. The combination oftwo barrels each having an annular series of cylinders, iluid inlet and outlet means for the cylinders of each barrel independent of the other barrel, pistons in the cylinder, means connecting said pistons in pairs each pair-consisting of one piston in each barrel, one piston of each i pair adapted to'lie at one extremity of movement in its cylinder when the other piston.

of the pair lies at the opposite extremity of movement in its cylinder, and means for rotating the barrels in unison. l

14. The combination of two barrels each having an annular series of cylinders, fluid inlet and outlet means for the cylindersof each barrel independent of the other barrel, pistons in the cylinders, means connecting said pistons in pairs each pair consisting of' one piston in each barrel, a guiding member holding said pairsof pistons in fixed relation to etloh other, means for rotating said barrels in unison, and means for holding said guiding member at a `ven angle to the axis of rotation of one of 511e barrels.

l5. The combination of two barrels each having an annular series of cylinders, fluid inlet and outlet means for the cylinders of each barrel-independent ofthe other barrel, pistons in the cylinders, means connecting said pistons in pairs each pair consisting of' one piston in each barrel, a guiding member holding said `pairs of pistons in fixed relation to each other, means for rotating said barrels in unison, means for holding said guiding member in a given position, and means for shifting the angular relation of said guiding member to the axis of rotation of one of the barrels 16. The combination of two barrels each having an annular series of cylinders, fluid inlet and outlet means for the cylinders of each barrel independent of the other barrel, pistons in the cylinders a disk arranged transversely of the path of said pistons and axis of rotation of the barrels, means connecting the pistons to said disk in pairs each pair consisting of'onepiston in each barrel, and means for rotating the barrels in unison. 17. The combination of two barrels each having an annular series of cylinders, fluid inlet and outlet means for the cylinders of each barrel independent of the other barrel, pistons in the cylinders, a disk arranged transversely of 'the path of said pistons and axis of rot-ation of the barrels, means for connecting the pistons to said disk in pairs each pair consisting of one piston in each barrel, and means for transmitting rotation from said disk to-said barrels.

18. The combination of tworotary barrels arranged in axial alinement and each having an annular series of cylinders, fluid inlet ind outlet means for the cylinders of each Darrel at its end opposite the other cylinder, pistons in the cylinders, means connecting said pistons in pairs each pair consisting of )ne piston within each barrel, and means for rotating .the barrels in unison.

v19. The combination of t-worotary barrels irranged in axial alinement and each hav- ,ng an annular series of cylinders, fluid inet and outlet mea s for the cylinders of each barrel at its en opposite the other cylinder, pistons in the cylinders, meanscom necting said pistons in pairs each pair consisting of pistons one in each barrel held ending an annular series of cylinders, fluid inlet and outlet means' for the cylinders of each barrel at its end opposite the other cylinder, pistons in the cylinders, means conrecting said pistons in pairs each pair conysisting of one piston in each barrel, means Tor rotating the barrels in unison and means for varying the stroke of all sad pairs of pistons simultaneously.

21. Thecombination of two rotary barrels arranged in axial alinement and each having an annular series of cylinders, fluid inlet and outlet means for the cylinders of each barrel at its end opposite the other cylinder, pistons in the cylinders, means connecting said pistons in pairs each pair consisting of one piston in each barrel, means for guiding said pairs of pistons in elliptical paths around the axis of rotation of the cylinders, means for rotating the barrels in unison, and means y for'varying the stroke of all of said pairs of pistons simultaneously.

22. The combination of two barrels each having an annular series of cylinders, separate means for admitting and exhaust-ing fluid from successive cylinders of each barrel, pistons in the cylinders, and means connecting said pistons in pairs each pair consisting of one piston in each barrel.

23. The combination of two barrels each having an annular series of cylinders, separate means for admitting and exhausting fluid from the successive cylinders of each barrel, pistons in the cylinders, means connecting said pistons inpairs each pair consisting of one piston 1n each barrel, and means forguiding the pistons-of each cylinder in an elliptical path around the axis of said cylinder. v

24. The combination of two barrels eac-h Ahaving an annular series of cylinders, separate'means for admitting and exhausting fluid from successive cylinders of each barrel, pistons in the cylinders, means connecting said pistons in pairs each pair consisting of one piston in each barrel, a guiding member. holding said pairs of pistons in fixed relation to each other, and means for holding said guiding member at a given angle to the axis of one of the barrels.

25. The combina-tion of two barrels, eachl having an annular series of cylinders, separate means for-admitting and exhausting fluid from successive cylinders lof 'each barrel, pistons in the cylinders, means connecting the said pistons in pairs each pair consisting of one piston in' each barrel, a

guiding'member holdingv said pairs ofv pis Y tons in given relation to each other, means for holding said guiding member 1n given f position, vand means for shiftmg said gulding member. ,A y

26. The combination* of twobarrels each having an annular series of cylindeis`,.pliuid inlet and outlet means for thel cylinders of each barrel independentof the other barrel,

pistons in 'the cylinders, a disk arrangedv transversely of the path of said-pistons and axis of rotation of the barrelsnmeans connecting the-pistons to said disk'inpairs each pair consisting o'f one piston in each`barrel,

lameans for rotating lthe'barrels in unison, and means for shifting the angular relatlon ,of said disk to the axis of rotation of the 27. The combinationof two barrels each having an annular series of cylinders, iuid inlet land outletmeans for the cylinders of each barrel independentof the other barrel,

28. The combination of a shaft, two

' barrels fast on said shaft having cylinders means for transmitting rotation from said arranged in alined pairs, pistons in said` cylinders, iiuid inlet and outlet means for the cylinders of each barrel independent of the other barrel, a disk arranged transversely y of said shaft between the barrels, means connecting the' pistons to said disk, and means for transmitting rotation from said disk to vvsaid shaft. 1

29. The combination of a shaft, twobarrels fast on said shaft having cylinders arranged in alined pairs, pistons in saidl cylinders', uid inlet and outlet means for `with inlet and outlet ports, a shaft extendthe cylinders of each barrel independent of the other barrel, a disk arranged trans- -versely of said shaft between the barrels,

means connecting the pistons to.said disk,

disk to said shaft, and means for shiftingthe angular relation of said ydisk to said shaft.-

30. Thecombination of a shaft, two barrels fast on said shaft having cylinders arran ed in alined pairs, pistons in said cylin ers,fluid inlet and outlet'means for the cylinders of each barrel independent of the other barrel, a disk arranged transversely of said shaft between the barrels, means connecting the pistons to .said disk, and intermeshing gears fast one on said disk and the. other on said shaft.

31. The combination of end plates. each with inlet and outlet ports, separate sets of ducts one for the ports of each end'plate, barrels arranged endwise one against each endplate and having an annular'series of.

cylinders with ports adapted to register with the ports of the end plate, means for holding said barrels to the end plates, pistons in said cylinders, means connecting v said pistonsin pairs each pair Vconsist-ing of a plston 1n each barrel, and means for rotating sald barrels .1n unison.

32. In* a pump, the .combination of a disk, and means for supplying under pressure to one of said barrels.

33. `Inv Aa pump, the combination of a shaft, two barrels fast on said shaft each having an annular series of cylinders, fluid inlet and outlet means for the -cylinders of each barrel independent of the other barrel,

a controlling disk arran ed, transversely of said shaft between the arrels, pistons in said cylinders having rods connected to said disk, means for supplying Huid under pressure to one of said4 barrels, and means for transmitting rotation between said shaft and controlling disk.

34. In a pump, the combination of a shaft, two barrels fast on said shaft each having an annular series of cylinders, uid inlet and outlet means for lthe 'cylinders of each barrel independentof the Iother barrel, a controlling disk arranged transversely of said shaft betwenfthe barrels, pistons in said cylinders-having rods connected- .tosaid disk, means for transmitting rotation beL tween said shaft and disk, means for shiftfing the angular relation of'said disk to said shaft, and means for supplying fluidunder pressure to vone of said,barrels.

35. The combination of 'end plates each ing between said'end plates, barrels on said shaft seated one against each end plate and having an annular series of cylinders with ports adapted to register with the ports of the end plate, means foradjustably holding said barrel seated, pistons in said cylinders, means connecting the pistons of .one barrel to those of the other barrelmeans for supplyin fluid under barre and means or causing said barrels to rotate in unison.

36. The combination of end plates each having inlet and outlet ports, barrels seated endwise one against each end plate and having annular series of cylinders with ports adapted to register with the Aorts of the end plate, a shaft extending` tween said end plates through thebarrels and engaging one of said barrels to seat the same, ad]ust able means upon said shaft for engagin the other barrel to seatit, a controlling beressure to one of said tween said barrel, pistons in said cylinders having piston rods connected-to said oontrolling disk, means for supplying fluid under pressure to one of said barrels, and means for causing said barrels to rotate in unison.

37. The combination of end plates each .having inlet and outlet ports, a shaft extending between said end plates, barrels rotatably fast on said shaft seated one against each` end plate and having an annular series of cylinders With' ports adapted to register 'for transmitting rotation between said disk and shaft, and means for supplying fluid under pressure to one ofsaid barrels.

CHARLES R. PRATT. Vitnesses:

RUSSELL M. EVERETT, FRANCES E. BLoDGn'r'r.

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