US1032344A - Hydraulic motor. - Google Patents

Hydraulic motor. Download PDF

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US1032344A
US1032344A US64901511A US1911649015A US1032344A US 1032344 A US1032344 A US 1032344A US 64901511 A US64901511 A US 64901511A US 1911649015 A US1911649015 A US 1911649015A US 1032344 A US1032344 A US 1032344A
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valve
port
piston
ports
motive fluid
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US64901511A
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Liborio Purpura
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Liborio Purpura
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/02Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K1/00Housing animals; Equipment therefor
    • A01K1/0005Stable partitions
    • A01K1/0017Gates, doors

Description

L. PURPURA.
HYDRAULIC MOTOR.
APPLICATION FILED SEPT.13, 1911.
Patented July 9, 1912.
4 SHEETS-SHEET 1.
L. PURPURA.
HYDRAULIC MOTOR.
APPLICATION FILED SEPT. 13, 1911.
Patented Jul 9, 1912.
4 SHEETSSHEET 2.
llllllllllllllllllllllllll:
171501-50 Pwpw'w G de mugs L. PURPURA.
HYDRAULIC MDTOR.
' APPLICATION FILED SEPT. 13, 1911. 1,032,344 Patented July 9, 1912.
4 SHEETS-SHEET 3.
s W M L. PURPURA.
HYDRAULIC MOTOR.
APPLICATION FILED SEPT.13,1911.
Patented July 9, 1912.
4 SHEETSSHEET 4.
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'LIIBORIO PURPURA, or WHEELING, w-Es'rvmemm;
' HYDRAULIC MOTOR.
To all whom it may concern:
Be it known that I,-L1B0RI0 PURPURA, a citizen' of the United States, residing at Wheeling, in the'county of Ohio and State of West Virginia, have invented certain new and useful Improvements in Hydraulic Motors, of-which the following. is=a specificat-ion.
This invention relates generally to hydraulic motors, being directed specifically .to that type of motordesigned to be used in conjunction with and deriving-its motive force from the pressure of a-city; water main or the like.
While the invention is adapted primarily to utilize Water'under pressure, as before mentioned, as the motive fluid, other mediums, such as air, steam and the like. may be employed to Operate the motor.
Salient features of the invention reside in cooperating oscillating valves, embracing a plurality of passages alternately serving as induction and eduction ports, and in a system of specially disposed motive fluid conduits.
While the invention is shown and described as in connection with the operation of a washing machine it is obvious that it is equally well adapted to be employed in the operation of other classes of machines, particularly those wherein the work to be performed is consistent with the use of power equal to that of water under the ordinary city pressure.
One object ofthe invention is the production of a motor primarily adapted for the operation of a washing-machine and which can be readily attached to and disconnected from any ordinary water spigot by inexperienced persons and which, when so attached and the motor initially started will require no further attention until the Washing operation is thoroughly'and effectively accom lished.
Another 0 ject is to produce a motor as simply constructed as is possible with the result gained, wherein, due to the-disposition and construction-of the'operating parts and the material of which theyare formed, friction, and incident-ally wear, is reduced to a minimum, thus insuring long. life to the apparatus under hard use.
Another object is the production of a motor wherein is avoided positioning valves Specification of- Letters Patent.
Application filed September 18, 1911. Serial No. 649,015.
contemplated that the Patented July9, 1912.
within a piston cylinder, a construction disadvanta'geouslycommon to a large class of washlngmachine motors and the occasion of much trouble and necessitating experiencedattention and care at the frequent perlods of their disarrangement from operative vention beingso constructed, irrespective of their positions, that they are at all times 1n; readiness to be immediately and operat vely. acted on by the pressur medium belng. introduced into the motor, no dead center in the operative movement of the valves being possible.
Another object is to provide a motor which can be effectually and easily connected for operation with any ordinary type of washing machine agitator, it being motor, through the medium of the ordinary gear or pinion, be espedially adapted for use in conjunction with the oscillating. type of agitator embracing a plurality of downwardly-extend ing stirring elements.
With these as the main objects of the invention the latter will now be described in the following specification, taken in connection with the accompanying drawings.
wherein is disclosed the details of the preferred form of the invention, and then more particularly pointed out-in the appended claims.
Referring to the drawings, Figure 1 is a perspective of the motor shown in operative relation with the agitator shaft of a washing machine. Fig. 2 is a vertical central section through the main valve and piston cylinder. Fig. 3 is a vertical section, partly in' elevation through the pilot valve. Fig. 4 is a transverse section through the main and pilot valves and the piston cylinder. Fig. 5 is a section similar to Fig. 4 taken on a lower plane. Fig. 6 is a transverse section through the'valve casing and cylinder showing the valves disposed to receive initial intake of the motive fluid. Fig. 7 is'a transverse vertical section, partly in elevation taken through the main and pilot valves. Fig. 8 is a vertical central section, partly in elevation showing the mechanism for operating the pilot valve. Fig. 9 is a perspective of the pilot valve. Fig. 10 is a perspective of the main valve. Fig. 11 is a perspective view, partly in section, illusparts throughout several views, the inven-.
tion comprises a valve casing 1', the plan contour of which is shown in Figs. 4, 5, and 6, and within which are disposed valve chambers 2 and 3 designed to receive respectively main and pilot valves 4 and 5. The body of the valve casing inclos'ing the two valve chambers is preferably cast integral, of any suitable material, and in the instance of main valve 4 said material extends below seat 6 solidly, as at 8 with the exception of a space later to be described, to within a distance of the lower edge of the casing appropriate to permit the seating of a removable screw-threaded cap 9 as shown in Fig. 2. In the instance of valve 5 a cavity 10 is'provided to permit the movement of parts controlling the oscillation of said valve and to be later explained. Valves 4 and 5 are provided res ectively with integral downwardly-exten ing shafts 11 and 12 projecting through apertures 13 and 14 formed respectively in valve seats 6 and 7 shaft 11, formed hollow for a portion of its length, projecting entirely through portion 8 of the valve caslng, as shown in Fig. 7 and ing provided with a longitudinal slot 15 coextensive in length with the hollow portion of said shaft, a shutter or wing 15, formed terminally throughout its vertical dimens'ion with enlarged retaining head 16 adapted, when said wing is operatively positioned with relation to shaft 11 to lie within the hollow portion. thereof and prevent disengagement of said shaft and wing, the latter being adapted for limited oscillation within a chamber 17 formed in portion 8 of the easing and radially disposed with relation to the bearing of shaft 11 in said portion.
To the lower terminal of shaft 12 of valve 5, extending downward into cavity 10 an appropriate distance, is rigidly connected by any suitable method, either permanently or removably, an operating finger 18 the free terminal of which extends between the forks of the bifurcated head 19 of rod 20, the latter adapted for longitudinal reciprocation through cylinder head 21, the construction ermitting necessary play of finger 18 within the forks of said rod in the reciprocation of the latter. Shaft 20 is attached by connecting arm 21' to a sleeve 22 adapted for reciprocating movement on a fixed guide pin 23 formed integral with or rigidly secured to cylinder head 21 and centrally extending therefrom within the cylinder 24 an appropriate distance, as shown in Fig. 4, said sleeve being provided adjacent its free terminal with shoulder 25 for a purpose hereinafter to be set forth.
26 denotes a piston rod formed hollow for a pottion of its length and carrying piston head27, adapted for reciprocation on sleeve 22 through bearing 28 of cylinder head 29, cylinder heads 21 and 29 being provided with "the usual cylinder seats and held to operative relative by means of tie-rods 30, asusual. Securely attached, in a removable manner is desired, to. the face of iston head 27 is a trip member 31 as shown in Fig. 8, and formed with a sleeve extension 32 disposed within said piston head, designed at a certain time in the forward travel of .the piston rod to contact with shoulder 25 of sleeve 22 and move the latter in the same direction of travel, thereby exerting a pull on rod 20, and, through the medium of finger 18, produce a partial oscillation of valve 5 on its seat 6 as clearly understood from Figs. 4 and 6.
33 denotes a motive fluid conduit connecting the valve casing 1 and cylinder head 29 as shown in Figs. 4, 5 and 6 and providing communication with the piston cylinder through channel 33' and 33 in said head in the rear of the piston head for functional reasons to be subsequently specified.
Detachably connected to piston rod 26 is toothed rack 34 designed of course to mesh with pinion 35 as shown in Fig. 1 and, in reciprocation of said rack, oscillate shaft 36 of said pinion and impart desired movement to parts connected thereto, as for instance the dasher of washing machine or the like.
37 denotes an inlet conduit and 38 an outlet conduit preferably adapted for screwthreaded connection with casing 1 and terminally provided if desired with hosethreads for ready connection with the usual hose coupling, conduit 37 being designed of course for attachment to the source of motive fluid, as for instance an ordinary spigot dium of a section of hose or the like (not shown).
Valve 4 is formed with a main inlet port 39 provided with a superposed communicating deflecting groove 40 formed in the valve body as shown in Fig. 10 and communicating with each of ports 41 and 42 through the valve, said ports and connecting channels being disposed in the same horizontal plane,
" ports 41 and 42 bein with each other. V alve 4 is also provided with communicating ports 43, 44, 45 and 46, the channels connecting said ports being disposed for clearance purposes in a horizontal plane above that of the channel con necting ports 39, 41, and 42 and coincident with the plane in which the guide groove 40 is disposed. Valve chamber v2 is provided with ports 47, 48, 49, and 50 port 49 communicating directly with the piston cylinder through cylinder head 21, ports 47 48 and 50 being disposed in a plane coinciding with the plane of ports 43, 44 and 46 and of the city water system, through the mealso in communication the deflecting groove 40, when the valve is seated in operative position, while port 49 is disposed in the same plane as ports 39,.
horizontal plane within the valve body.
Valve 5 is also formed with communicating ports 57, 58, .59 and 60, all of said ports lying in the same horizontal plane disposed, for clearance purposes, above the plane 'of ports 51, 53 and 54 and in a plane coincident with that of guide-grooves 52, 55 and 56. I
Valve chamber 3 is provided with ports 61, 62, 63 and 64, ports 62 and 64 lying in the same horizontal plane coincident with that of ports 57, 58, 59 and 60 of valve 5 when the latter is operatively seated, while ports 61 and 63 are disposed in the same horizontal plane coincident with the plane of guide-grooves 55 and 56 under similar conditions. port formed in the bottom of inlet pipe 37 and connected, by means of pilot channels 66, passing through the casing, to valve chamber inlet port 61, 67 denoting an outlet or exhaust port formed in eduction pipe 38 and connected by means of channels 68 with port 64 of valve chamber 3.
69 denotes a port formed in one wall of wing chamber 17, connected by means of channel 70 to port 62 of valve chamber 3, while 71 denotes a port formed in the opposite wall of wing chamber 17 and disposed in similar relative position as port 69,-and connected by means of channel 72 to port 63 of valve chamber 3.
The operation is as follows: Assuming the parts positioned as disclosed in Fig. 6, wherein piston head 27 is at the limit of its rearward travel guide-groove 40 and port 41 of valve 4 are respectively registering with inlet port 47 and port 49 of valve chamber 2, while ports 44 and 46 of valve 4 are registering with ports 48 and exhaust port 50 of said chamber. Simultaneously with the above described registration of ports of valve 4 ports 57 and 59 of valve 5 are registering with inlet port 61 and 62 respectively, while guide-groove 56 is registering with valve chamber port 63, in which relative position of the valves, and piston head, ports 42, 43, and 45 of valve 4 and ports 53, 58 and 60 of valve 5 are blocked and incidentally idle, wing 15 be- 65 denotes an intake or inlet.
ing disposed at the limit of its movement in one direction in wing chamber 17, as shown in Fig. 6. At the stage of operation represented by Fig. 6 the course of the motive fluid is as follows: Connection having been established with the source of power the motive fluid enters induction pipe 37, passing into guide-groove 40 and being deflected thereby into inlet port 39, as clearly shown in Fig. 2, then throu h valve 4 to communicating port 41 of sai valve, thence through port 49 of valve chamber 2 and through cylinder head 21 into the piston cylinder and impinges against piston head 27, said motive fluid simultaneously with the above described movement, entering port 65, passing through pilot channel 66, through port 61 of valve chamber 3 into port 57 of valve 5, through the valve to port 59 and thence into port 62 registered therewith, and into channel 70, emerging therefrom through port 69 in wing chamber 17 and impinging against Wing 15' and forcing the latter to the position disclosed by Fig. 6, said wing, in this movement, under impulse of said motive fluid, exhausting that portion of wing chamber 17 in the path of its movement, through port 71 of said chamber, through channel 72, through port 63. of valve chamber 3, into guide-groove 56 of valve 5, being deflected downward there- 'by into port 54, through said valve, thence,
through port 51, up through communicating guide-groove 52, now registered with port 64 of valve chamber 3, through the latter port into channel 68, thence out of port 67 and through exhaust pipe 38 from which the exhaust may of course be directed by means of suitable hose connection to any convenient drainage.
lVhen the valves are disposed in the abovedescribed relation the motive fluid is acting through port 49 on piston head 27 which of course is being forced and imparting a throw to rack 34, exhaust from the piston cylinder being provided for through port 33", channel 33, conduit 33, port 48 of valve chamber 2, port 44 of valve 2, through said valve, out of port 46 of the latter, through port 50 of valve chamber 2 and into exhaust pipe 38 and thence to drainage. During the forward movement of the piston up to the point immediately previous to contact of sleeve extension 32 of trip member 31 with shoulder 25 of sleeve 22 no change has occurred in the disposition ofvalve 5 as disclosed by Fig. 6. Immediatelyon contact of extension 32 with shoulder 25 and during and up to the limit of the remaining forward movement of the'piston, pull is exerted on sleeve 22, which, moving forward on guide-pin 23 under the influence of said pull, occasions, through arm 21, a forward throw of rod 20 which in turn, through the medium of bifurcated head 19 thereof and coiiperating finger 18 imparts a partial oscillation to valve 5 (in the direction of the arrow in Fig. 6) and disposes said valve in accordance with the disclosure in Fig. 4, at the limit of said forward movement. Previous to the limit of the above described partial oscillation of valve 5, no change has taken place in the position of valve 4. Simultaneously with piston head 27 reaching the limit of its forward stroke and valve 5 reaching the limit ofits described partial oscillation under the influence of said stroke, provision is made for the return stroke of said piston and the necessary exhaust of the dead fluid through the following described arrangement of ports and channels, occasioned by the above described disposition of valve 5 under the influence of piston rod 26, as shown in Fig. 4, valve 4 being partially oscillated from position shown in Fig. 6 to that indicated by Fig. 4 immediately subsequent to the attainment of the position disclosed by said figure of valve 5 and iston head 27, and previous, of course, to initial return stroke of piston rod 26, and providing for the piston return stroke and the exhaust. Referring to said Fig. 4 it will be seen that as valve 5 reaches the limit of its partial oscillation, guide-groove 52, port 58, port 53 and port 60 of valve 5 register respectively with ports 61, 62, 63 and 64 of valve chamber 3 while ports 57, 59 and 54 are blocked and idle, the above described registration of said ports permitting the entrance of motive fluid through port 65, channel 66, port 61 of valve chamber 3, into deflecting groove 52 down into port 51, as clearly shown in Fig. 3, through the valve to port 53, thence into port 63, through channel 72, out of wing chamber port 71 and impinging on wing 15 and forcing the latter to the opposite side of said chamber in position as illustrated in Fig. 4,the exhaust from said chamber being provided for through the registration occasioned in the movement of valve 5 to position shown in Fi 4, of communicating ports 58 and (30 of sa1d valve with ports 62 and 64 respectively of valve chamber 3, providing unobstructed passage for the motive fluid exhausting from wing chamber 17 through channel port 69, channel 70, port 62 of valve chamber 3, port- 58 to communicating valve port 60, thence through valve chamber port 64, channel 68 and port (37 whence it passes through exhaust pipe 38 to atmosphere or-drainage in accordance with the nature of the motive fluid being employed.
The movement just described of wing 15, through its connect-ion with shaft 11 of valve 4 produces a partial oscillation of the latter in the direction indicated by the arrow and causes registration of ports 43, 45, 42 and deflecting groove 40, communicating with port 39, of valve 4 with ports 47, 48, 49
and 50 of valve chamber 2 respectively, all other ports of said valve being meanwhile blocked and idle, and providing for passage of motive fluid through inlet pipe 37, port 47 of valve chamber 2, ports 43 and 45 of valve 4, port 48 of valve chamber 2, thence through conduit 33, through channel 33 and port 33 whence it impinges upon the front face of piston head 27 which, under the pressure of said motive fluid thus introduced, will begin to move in its return stroke and of course cause the return stroke in the reciprocation of rack 34, exhaust from the piston cylinder before the travel of piston head being provided through port 49, ports 42 and 39 of valve 4, thence upward'through deflecting groove 40 of port 39, through exhaust port 50 and out of exhaust pipe 38.
Fig. 5 illustrates the position of the valves and course of the motive fluid during the partially completed return stroke of the piston, said position and ports being similar to that disclosed by Fig. 4 and remaining unchanged until the piston head contacts with arm 21, operating rod 20, and, through the medium of finger 18, producing a partial oscillation of valve 5 to position shown in Fig. 6, valve 4 meanwhile remaining in position shown in Fig. 4 until valve 5 has reached the limit of its movement in said partial oscillation, piston head 27 having simultaneously reached the limit of its return stroke, when the motive fluid will take the course as before described in connection with Fig. 6, producing, through movement of wing 15 a partial oscillation of valve 4 to position illustrated by Fig. 6, when the piston head will receive impact of the motive fluid and begin another forward stroke, exhaust being accomplished as described in connection with the position of the parts as illustrated in said figure.
73 denotes a plurality of leakage chan nels, extending in parallel relation verti cally through valve 4, practice having demonstrated the advisability of including said channels in the structure to eliminate any tendency of said valve to bind in its chamber in operation or be slightly displaced from operative relation, in order to insure accurate and correctly-timed registration of the various ports at a predetermined moment in said operation.
74 indicates a bottom plate adapted for screw-threaded connection with the lower edge of that part of the casing inclosing controlling valve 5, and permitting, in conjunction with cap 9, and caps 75 and 76 coming inv contact with the motive fluid in operation are provided with suitable packing to establish tight connections.
7 7 denotes a bed plate to which the motor is removably connected in any preferred manner, said plate being detachably fixed to the usual hinged tub cover and being formed adjacent one end with an upwardly projecting guide lug 7 8 designed, when motor and bed plate are assembled, to extend through slot 79 of rack 34 and insure reciprocation of the latter in a desired permanent plane for accurate cotiperation with pinion 35, 80 indicating a series of drip-grooves adapted to receive, in the instance when water is employed as the motive fluid, any leakage from the operation of the motor, from which grooves said leakage may be readily and conveniently removed by the use of a sponge or the like.
Referring to Figs.4, 5 and 6 it will be observed that in each of said figures that those ports of both the main and pilot valves which are disposed in one plane are shown in dotted lines while the ports disposed in the other plane are shown in full lines.
Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is
1. In a hydraulic motor, a piston, a main valve for controlling the flow of the motive fluid to opposite sides of the piston, a wing carried by the main valve, and an independent automatically-actuated pilot valve to direct the motive fluid into contact with the wing to operate the main valve.
2. In a hydraulic motor, a piston, a main valve for controlling the flow of the motive fluid to opposite sides of the piston, a wing carried by the main valve, and an independent piston-operated pilot valve to direct the motive fluid into contact with the wing to operate the main valve.
3. In a hydraulic motor, a piston, a main valve to control the flow of the motive fluid to opposite sides of the piston,.a wing removably connected to the main valve, an independent pilot valve to control the flow of the motive fluid to opposite sides of the wing, and operating connections between the piston and pilot valve.
4. In a hydraulic motor, a piston, a main valve to control the flow of the motive flu d to opposite sides of the piston, a wing removably connected to the main valve, an independent pilot valve to control the flow of the motive fluid to opposite sides of the wing, and operating connections between the piston and pilot valve serving to operate said pilot valve during a portion of the movement of the piston at its respective extremes of stroke.
5. In a hydraulic motor, a piston, a main rotary valve for controlling the flow of the motive fluid to opposite sides of the piston,
said valve being formed with two main superimposed channels each adapted for service as supply and exhaust channels in accordance with the position of the valve, and means controlled by the piston for utilizing the motive fluid for directly actuating the main rotary valve.
6. In a hydraulic motor, a casing, a piston operating therein, a main rotary valve for controlling the flow of the motive fluid to the piston, an independent pilot valve operated by the piston and directing the motive fluid, and a wing carried by and .arranged below the main rotary valve to directly receivethe impact of the motive fluid through the pilot valve whereby to position said main rotary valve.
7. In a hydraulic motor, a casing, a piston operating therein, a main rotary valve for controlling the flow of motive fluid to the plston, said casing being formed with inlet and exhaust channels, said main rotary valve being formed with two horizontally offset channels opening wholly through the valve, each of said channels successively cotiperating with the inlet and exhaust channels of the casing, a wing carried by the main rotary valve, and means actuated by the piston to direct the motive fluid against the wing to position the main rotary valve.
8. In a hydraulic motor, a casing, a piston operating therein, a main rotary valve for controlling the flow of motive fluid to the piston, said casing being formed with inlet and exhaust channels, said main rotary valve being formed with two horizontally oflset channels opening wholly through the valve, each of said channels successively cooperating with the inlet and exhaust channels of the casing, a wing carried by the main rotary valve, and an auxiliary rotary valve controlled by the piston and directing the motive fluid into contact with the wing to position the main rotary valve.
9. In a hydraulic motor, a piston, and a valve for directing the motive fluid to opposite sides of said piston, said valve being formed with two horizontally-offset channels opening wholly through the valve, each of said channels serving successively as inlet and exhaust ports for the piston control, one of said channels communicating at one end with a verticallyarranged groove formed in the valve body to provide for the coiiperation of said channel with either of two vertically-spaced feed conduits.
10. A hydraulic motor including a casing, a piston therein, a main valve. a wing carried by the main valve, a pilot valve for controlling the flow of the motive fluid to the wing, said pilot valve having superimposed ports opening therethrough and each successively serving as inlet and exhaust ports for the wing-operating fluid.
11. A hydraulic motor including a casing,
successively serving as inlet and exhaust orts for the win -operatin fluid, said casmgbeing forme with m et and exhaust passages arranged on difierent planes, and
10 said pilot valve being formed with a groove in communication with one of said ports whereby to permit said port to communicate with both of said passages alternately.
In testimon whereof, I aflix my signature in presence -0 two witnesses.
LIBORIO PURPURA.
Witnesses:
HARRY L. GOULD, BENNEI'I S. J omus.
US64901511A 1911-09-13 1911-09-13 Hydraulic motor. Expired - Lifetime US1032344A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422901A (en) * 1941-07-05 1947-06-24 George D Hunter Rotary pump
US2608183A (en) * 1949-01-06 1952-08-26 Littleford Bros Inc Hydraulic oscillator for the shaft of an agitator
US2608994A (en) * 1941-07-05 1952-09-02 George D Hunter Control valve for power transmissions
US2866441A (en) * 1954-03-05 1958-12-30 Prep Ind Combustibles Hydraulic motor for a jig
US3176593A (en) * 1962-06-21 1965-04-06 Robert J Bernstein Pressure responsive servo valve
US6007310A (en) * 1993-11-23 1999-12-28 Sarcos, Lc Volumetric pump with sterility seal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422901A (en) * 1941-07-05 1947-06-24 George D Hunter Rotary pump
US2608994A (en) * 1941-07-05 1952-09-02 George D Hunter Control valve for power transmissions
US2608183A (en) * 1949-01-06 1952-08-26 Littleford Bros Inc Hydraulic oscillator for the shaft of an agitator
US2866441A (en) * 1954-03-05 1958-12-30 Prep Ind Combustibles Hydraulic motor for a jig
US3176593A (en) * 1962-06-21 1965-04-06 Robert J Bernstein Pressure responsive servo valve
US6007310A (en) * 1993-11-23 1999-12-28 Sarcos, Lc Volumetric pump with sterility seal

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