US2428619A - Rotary pump or the like - Google Patents

Description

Oct. 7, 1947. N. DOUGLAS 2,428,619

ROTARY PUMP OR THE LIKE Filed Nov. 6, 1944 6 Sheets-Sheet 1 Num.

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Oct. 7, 1947. N, DOUGLAS Y 2,428,619

ROTARY PUM1 3 OR THE LIKE mi( IIHI l Q @n 3 I INVENTOR:

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ATTORNEYS.

Oct. 7, 1947. N.` DOUGLAS l vROTARY PUMP OR THE LIKE 6 sheets-sheet s Filed Nov. 6, 1944 Oct. 7, 1947- N. DOUGLAS ROTARY PUMP OR THE LIKE Filed Nov. e, 1944 e sheets-shea 4 Oct. 7, 1947. N. DOUGLAS 2,423,619

ROTARY PUMP OR THE LIKE Filed Nov. 6, 1944 6 Sheets-Sheet 5 Jay Z, 74 172 /67 Clttorneg! 7 N. DOUGLAS k ROTARY PUMP 0R THE LIKE" s sheets-sheet e Filed Nov. e. 1944 IN VEN TOR. /Ya/'e/aqy.:

BY @W7/MJ Patented Oct. 7, 1947 UNITED STATES Plrr:NTl orner:

Norvel Douglas, Dallas, Tex.

Application November 6, 1944, Serial No'. 562,072-

' which is expandedl and contracted progressively along the length thereof by a rotatable eccentric and Which requires no valves, packing, or similar mechanisms to control flow and prevent leakage of fluid.

Other objects of the invention are to provide a pump structure especially adapted to build up relatively high pressures on fluids containing abrasives and similar substances that in ordinaryY pumps as heretofore constructed are destructive to the packings, valves, and sliding surfaces; to

at relatively low speeds; to provide'a pump construction for maintaining a substantially constructure .having long life and trouble-free voperation even' when handling abrasive' fluids.

It is also an object to provide a pump structure which is adapted for construction from materials selected so that they are suited to the character of the fluid being operated on by the pump.

In accomplishing these and other objects of the invention, I have provided improved structure, the preferred form of which is illustrated in the accompanying drawings wherein:

Fig. l is a longitudinal section through a pump embodying the features of the present invention.

Fig, 2 is a lcross section through the pump on the line 2--2 of Fig. l. V

Fig. 3 is a similar section on the line 3-3 of Fig. 1.

Fig. 4 is a perspective view of the subbase of the pump which cooperates with abase'manifold for anchoring the fluid intake and displacement chambers of the pump. l i

Fig. 5 is a perspective View of the base manifold of the pump.

l Fig. 6 is a perspective View partly in section of one of the fluid intake and displacement chambers.

Fig. 7 is a cross sectionthrough the base manifold particularly illustrating the fluid inlet and outlet connections of the pump.

Fig. 8 is a fragmentary section of a liquidcooled gas compressor embodying the features of the present invention.

Fig. 9 is a longitudinal Vertical section through a modified form of the invention wherein the pumping chamber is formed onlone side by a rigid stator and on the other by yan elastic member.

9 Claims. (Cl. 103-149) provide a pump structure having ylarge capacity Atinuous uniform pressure; and to provide a pump Fig. 10 is a crosssection through the pump on the line IU-IU of Fig. 9. 4

Fig. 11 is a cross section on the line II-II of Fig. 9.

Fig. 12 is a perspective view partly in section of one ofthe piston units of' the pump illustrated in Fig. 9.

Fig. 13 isv a perspective view partly broken away of one of the stator units.

Fig. 14 is an enlarged fragmentary section through the elastic member, particularly illustrating arrangement of the reinforcing cords.

Fig. 15 is a perspective View of oneof the piston guides.

Referring more in detail to the drawings:

The pump illustrated includes, a horizontally disposed, substantially cylindrical case l containing one o r more operating units, here shown as twoinnu'mber-and generally designated 2 and 3 andarranged` to operate 180i out of phase whereby substantially continuous uniform pressure vis maintained on the discharge side of the pump.

The case I includes a substantially cylindrical wall 4 closed at one end by a Wall 5 and at the opposite end by a removable plate 6. The lower portion of the case has a depending offset I pro vided with a longitudinal opening 8 terminating short of the ends ofthe case and provided along the sidesthereof with inset shoulders 9 and l0 to seat a subbase member II. The end Wall 5 is preferably formed integrally with the .cylindrical Wall of the case andI has an axial bearing housing I2 facing inwardly of the case to mount the outer race I3 of an anti-friction bearing I4. The removableend plate 6 has a similar axially positioned bearing housing I5 facing inwardly to mount the outer race I6 of ananti-friction bearing I1, which bearings have inner races I8 and IBfmountingthe journals 20 and 2.I of 'a shaft 22 as later described. The'end plate S'has arcuately spaced openings 23 in the periphery through which fastening devices such as studs 24 are projected into threaded sockets 25 formed in the wall 4 at the open end thereof as best shown in Fig.v

1, the studs being provided with nuts26 bywhich the end plate is retained in vsealing contact with a gasket 2l to retain lubricant within the case as later described. The axial portion of the plate' 6 has an opening-28 therein through which a reduced end 29 of the eccentric shaft is projected.

for mounting a suitable driving element such as I a gear, pulley, or thelike, to .couple the pump with -a prime mover (notshown). The opening 28 is encircled by an annular recess 30 for mounting a 4packing'element 3l lto seal about the end of the shaft and prevent escape of lubricant therethrough. The subbase includes a plate portion 32 having marginal sides 33 and 34 and ends 35` and 36 seated against a gasket 31 bearing upon the shoulders 9 and which is retained in sealing contact by fastening devices 38 that are projected' through openings 39 in the plate and into threaded sockets (not shown) in the offset portioni ofthe case for closing the opening thereinto. The subbase has pairs of port-like openings 40-4I and l2-43. The port-like openings are formed in bosses 44 and 45 projecting up-l wardly into the opening 8 of the case `*and the por-tsv of each pair are located on opposite sides of a longitudinally extending rib 46 for a purpose later described. Each port is of elongated form and has upwardly and inwardly converging side faces 41 and 48 terminating in collar-like faces 49`adapted to embrace the terminal ends of the elastic intake and displacement chambers 50 and 5| as later described. The lower face of the plate surrounding each of the ports has shoulder-like recesses 52 for accommodating flanged ends for a purpose later described.

The case I seats upon a base manifold 53 which includes an elongated hollow body having side walls 54--55, end walls 56-51, and top and bottom walls 58-59. The top wall 58 is provided with elongated pairs of lports 606| and 62-63 registering with the ports in the subbase and encompassed by upwardly extending flanges 64 having upwardly and inwardly converging outer faces 05 conforming to the taper of the faces 4 1 of -the subbasebut which are spaced therefrom supply (not shown) and a fluid receiver (also not shown) .l The base manifold is secured to the bottom of the case by fastening devices such as studs 12 that are projected through ap'ertured ears k13 extending 4laterally from the base manifold and into threaded sockets 14 formed in the depending extension of the base, the studs being y insert opening II I closed by a plug H2.

provided with nuts 15 by which thebase maniv fold is drawn into contact with the casing and for anchoring the previously mentioned elastic chambers. The base manifold also includes feet 16 projecting from the respective corners thereof for supporting the pump, the feet being provided with suitable openings through which fastening devices (not shown) may be inserted to anchor the pump to a, suitable support.

The units 2 and 3 each includes an elastic tube having relatively flat parallel inner and outer walls 11 and 18 connected at the ends thereof as at 10 and 80 to form substantially horseshoe-shaped chambers 8| and 82. The legs 83 of the chambers terminate in collars 84 having flanges 85 adapted to seat within the shoulders 52 when the collars are clamped between the plastic material such as rubber, synthetic rub-` ber, or the like suitable for the fluid operated upon by the pump. The outer wall 18 of each elastic chamber, is vulcanized or suitably ce- 'by the liner.

the shaft 22.

mented to a sleeve-like linerl 81, which liner is snugly sleeved within the case and anchored in position by fastening devices such as cap screws 88 projected through openings 89 in the wall 4 of the case and into threaded sockets 90 carried The inner walls 18 of the elastic chambers are similarly fixed to sleeve-like liners 9| that are similarly attached yto the peripherial faces of eccentrically supported cylinders designated 92 for the unit 2,.and 93 for the unit 3..

The cylinders have longitudinal grooves 94 on the undersides thereof which receive therein the rib 46 on the subbase which -positions the cylinders and prevents rotation thereof upon operation of eccentrics 95 and 96 that are formed on The eccentrics 95 and 96 each include a pair of circumferential raised portions 91 and 98 on the shaft for seating the inner and outer races |03 and |04 seated within internal shoulders |05 and |06 formed within the eccentrically-supported cylinders as best. shown in Fig. 1. The outer races of the anti-friction bearings are retained from inward movement with respect to the eccentric cylinder lby ribs |01 and .the inner races are retained from outward movement on the eccentric portions of the shaft by lock rings |08 received in grooves |09 of the eccentrices so that the cylinders are anchored in xed longitudinal position relative to the ecy centric-shaft by the anti-friction bearings. The eccentrics are counter-balanced intermediate the anti-friction bearings .by counter-weights ||0 that are attached to the shaft diametrically opposite the high portions of the eccentrics as shown in Figs. 1,2, and 3.v

The case may be provided with a lubricant The case may have a drain opening v||3 in the bottom closed by a'p1ug`||4. If desired, the case may have an inspection opening I I5 to determine level of lubricant inthe case. This opening may be closed by a plugk ||6 as shown in Fig. 1.

In assembling the pump, the anti-friction bearings |0| and |02 are installed upon the eccentric shaft 2| with the outer races |03 and |04 engaging within the bearing .seats |05 and |06 of the l eccentrically-supported cylindersy 92 and 93 while the shaft is exterorly of the case. After insertapplied on the journals 20 and 2| of the shaft 22. The elastic chambers 50 and 5| are then cemented to the metal liners or sleeves '81 and 9| and the metal liners 9| are sleeved over the eccentric cylinders 92 and 93 and secured by the fastening devices 88. The shaft assembly is then placed inthe case so that the bearing I4 enters the housing I2. The four legs of the elastic chambers will slide freely into the opening 8 of the case and thel grooves 94 in the eccentric cylinders 92 and 93 are located in registry with the rib 46, after which u the fastening devices 88 are inserted through the case openings 89 to anchor'the outer metal linersV or sleeves 81. The removable end platek 6 is then slid into position on the shaft so that the bearing v I1 enters the bearing housing I5 and the plate is secured to the case by means of the studs 24. The

case is then turned upside down and the open ends or collars 84 of the chambers are pulled through the port openings 40-,-4| and 42-43 in the subbase after which the subbase is at.

tached to the case by the fastening devices 38. The base manifold 53 is then set in position. on the subbase with the tapering flanges 64 thereon entering within the open endslof the elastic chamcant to the level opening lbers so as to bell the vwalls thereof outwardly into sealing engagement with the subbase as shown in Figs. 1, 2, and 3. The studs I2 are then applied and thenuts 15 thereon drawn tight to assure 'a ture illustrated, the elastic members 50 and 5| must be constructed of a material that does not deteriorate in oil, for example, one of the synthetic plastics now on the market. However, the individual bearings may be sealed so that ordinary rubber might be used in formation of the elastic chambers without departing from the spirit of the invention. The pump is then mounted on a suitable base and connected with a prime mover capable of rotating' the shaft at a desired speed, vfor example, .600 R, P. M. In operation, the eccentric shaft 22 is rotated causing rotation therewith of the inner races 99 and |00 of the anti-friction bearings I0! and |02. -The balls of the bearings then planetate in the outer races |03 and |04 so that the eccentric cylinders remain in their same relative positions with'ree spect to rotation, however, the axial centers of the eccentric cylinders will be caused to gyrate about the rotational axis of the shaft in an amount equivalent to the throw of the eccentrics. At the maximum throw of the eccentrics, the inner and outer walls of the Chambers are tightly compressed as in the case of the unit illustra-ted at the left-hand side of Fig. l. Instead of a point or line contact of the walls, the actual Contact is suicient to effect a fluid-tight seal and the area of contact travels progressively around the elastic chambers from the intake to the discharge sides, thereby causing an intake of fluid through the inlet ports, which discharges are progressively moved ahead of the contact area to be expelled through the outlet ports when the eccentrics are in downward position as shown. in Fig. 2.

The most critical part of the elastic chambers is the closed circular ends of the leg portions thereof and these parts may be reinforced by fabric or similar reinforcing material. A short distance from the open ends of the elastic chambers there is also a flexing as indicated at points ||1 and IIB. The point in Fig. 3 illustrates how the pressure would. slightly stretch the wall of the chamber out against the rib 46 under pressure so that the rib protects the collarportions 84 of the chambers from further expansion. On the suction side the liners are slightly stretched as shown at ||1 (Fig. 3)

When the eccentrics are down closing both ports, the elastic material forming the chambers is pressed down by the eccentrics and the material is in unstretched condition (see Fig. 2). As the elastic material wears from abrasives from fluid running through it, the point of contact may be corrected by applying a shim between the inner sleeves '|1 and eccentric cylinders 92 and 93.

It is thus obvious that the fluid is drawn through the ports 40 and 42 into the open'ends of the elastic chambers and isformed progressively by the contact area of the walls through the elastic chambers to the discharge ports incidental to rotationof the eccentrics. vliiressing-together of the inner and outer walls of the. chambers makes a pressure-tight and Vcontinuous seal s0 that there is no loss in pressure or back leakage through the intake ports.v It will be particularly noted that since the inner and outer walls are anchored respectively to the case andeccentric cylinders the elastic chambers will be forcibly opened thereby to effect full intake capacity thereof.

Since the eccentrics of the units are arranged in diametrically opposite directions relative to each other, one o'f the units will be drawing in of fluid while the other unit is discharging fluid. Thus, constant, uniform pressure is maintained in the discharge manifold of the manifold base.

If'the pump isused for operating on an elastic fluid such as air, the case may be lled with oil and the oil pumped through a radiator (not shown) to absorb the heat of compression or the case may be provided with a jacket ||9 through which a cooling medium is circulated as shown in Fig. 8. i

Theform of the invention illustrated in Figs. 9 tov15 inclusive includes one or more units. the operating chambers of which have one Side formed of a flexible member. In this form, |20 designates a housing or casing composed of a base section `|2| and an upper or cover lsection |22. The base section |2| has a semi-cylindrical wall |23 supported in horizo-ntal position on legs |24 and the ends of the wall are closed by ends |25, The wall |23 has openings |26 and |21 (Fig. l0) disposed on opposite sides of'the horizontal center thereof and arranged in pairs longitudinally spaced to connect with intake and discharge manifolds |28 and |29 which are illustrated as being formed as integral parts 4of the base. The manifolds have inlet and outlet connections |30 and |3| located intermediate the pairs of openings as shown in Fig. 10 and indicated indotted lines in Fig. 9, the connections being'suitably machined for receiving ducts (not shown) by which fluid is admitted into and discharged from the pump. The rim of the wall |23 and ends |25 are flanged outwardly to form a seating face |32` 4for the cover section |22.` The cover section |22 also includes a semi-cylindrical wall'portion I33'corresponding to the wall portion |23 and ends |34 registering with the walls |25 and which have faces |35 adapted to seat on' the faces |32 to form an enclosed cylindrical comregistering edges thereof at one end of the cas ing with an opening |43 counterbored to accom modate a sealing ring |44. The inner sides of the end walls are provided with recesses |45 and v tudinal wedges |83.

stators and into threaded sockets to accommodate counterbalance weights |63 for counterbalancing the eccentrics and the parts carried thereby. The counterbalancing weights are offset to gyrate in the spaces |64 circumferentially of the shaft bearings |41 and |48 and have collars |65 secured on the shaft in position to give the correct dynamic balance by set screws |66.

Pressed upon each of the races |51 are eccentric pistons |61 each including a substantially sleeve-like body having an inner diameter to accommodate the outer races |51 of the bearings and provide a stop shoulder |68 at one end cooperating kwith a lock ring |69 at the other for maintaining longitudinal position of the eccentric pistons as shown in Fig. 9. The circumferential faces of the eccentric pistons terminate at the ends in tapering end faces and |1|.

Mounted on the eccentric pistons are flexible liners |12 formed of elastic material; for example, rubber, and molded upon the eccentric pistons to provide the necessary shape therefor. To facilitate anchorage of the liners, the eccentric pistons are preferably provided with a series of dovetail grooves |13 extending ciroumferentially thereof to receive portions |14 of the rubber therein so that the intermediate portions 0f the liners are firmly anchored to the pistons; however, the end portions |15 and |16` are free of the tapered `portions |10 and |1| to permit flexing. thereof upon actuation of the piste-ns as later described.

The liners are provided with flanges |11 and |18 for attachment to the stators |19. The annular portions of the liners terminate at ,points substantially over the ports 26 and |21 in flaps |80 and |8|, the ends of which are received in a substantially V-shaped longitudinal recess |82 of the stators |19 and are clamped therein by longi- The wedges |83 are drawn into clamping engagement by screws |84 having shanks extending through openings |85 inthe |86 of the wedges as shown in Fig, 10. In order to enhance the seal and more securely anchor the flaps, the flaps are preferably provided with longitudinal ribs |81 engaged in grooves |88 in the sides of the recesses. The flanges |11 and |18 overlie flanges |89 andi 90 of the stators and are secured thereby by clamping lrings |9| by fastening devices |92 extending through openings |93 in the clamping rings and into threaded sockets |94 of the flanges |89 and |90.

The stators are also of sleeve-like formation and the end flanges |89 and |90 cooperate with k an intermediate rib |95 to center the stator Within .are constructed to press the outer faces of the liners into contact with the inner faces ofthe stators progressively from the inlet port toward the exhaust port to effect movement of fluid therethrough substantiallyv in the manner described in the rst form of the invention. The ends of v the stators therefore, have inwardly tapering ends |98 and |99 corresponding to the tapers |10 and |1| of the pistons. A

In order to enhance the seal and gripping engagement of the flanges of the liners, the anges v are preferably providedy on the facing sides thereof with arcuate ribs 200 engaged in corresponding arcuate grooves 20| of the stators. A seal is effected around the ports |96 and |91 by gaskets 202 inserted between the stators and the casin |20. f In order to prevent rotation of the piston members, and thus reduce stress in the nexingposit tions of the liners ends thereof terminate in annular ring-shaped extensions 203 of substantially,"l channel-shaped cross section to accommodate rollers 204 therein, the rollers being retained on pins 205 having the ends thereof fixed in suitable openingsin the side flanges 206 and 206 of the., extensions, ythe rollers being positioned in open.

ings 201 formed in the web portions ofthe ringlike extensions whereby the major portion of the rollers are adapted to engage in spaces 208k formed between teeth 209 within the inner ldiameter of the clamping rings |9| as shown in Fig. 1. Therefore, when the eccentrics are rotated the piston members are prevented from rotating by reason of engagement of the rollers between the teeth of the clampingrings, however, the pistons move eccentrically with rotation of the eccentrics so that the rollers progressively enter the 'spaces between the respective teeth and are retracted v therefrom incidental to gyration of the eccentrics. As shown in Fig. 14, the liners are reinforced to .withstand the' hydrostatic pressurewith one or more layers of circumferential cords 2|0 with one or more layers of transverse cords 2| The cords are preferably of cotton, rayon, nylon, er

steel strands, and are completely surrounded by the rubber or other flexible plastic from which the liners are formed.

.The form of the pump just described is assembled as follows:

. The liners |12 are molded on the eccentric pistons and are firmly secured thereto when the rubber composing the liners is vulcanized, a mechanical bond being maintained by the annular dovetail grooves and through bonding of the rubber to the metal.

The guide rollers 204 are then installed by means of the pins 205 on which the rollers turn.l

The eccentric pistons carrying the` liners are inserted within the stators |19 and lthe'flanges of the liners are clamped to the flanges of the stators by the clamping rings 9|, the rings being secured by the fastening'devices-I92 so that 'the flanges of the liners are anchored concentrically of the stators and in sealed relation therewith. The flexible end flaps and |8| of the liners rhaving been inserted in the recesses |82, are.

drawn into sealing engagement with the walls of the recesses by tightening the screws |84 to draw the wedges |83 therebetween. In applying the liners to the stators, care is taken that the beads or ribs engage in the grooves of the stator. Since the grooves are slightly smaller than the lbeads or ribs, they provide a tight seal for the fluid spaces or courses of the piston chambers which is that space between the eccentric pistons and the vinner faces of the stators. The'bearing races |52 are then pressed into the pistons and retained 9 by the lock rings |60. The anti-friction bearings |56 are then applied to the eccentric portions of the crank shaft |53 and the'piston assemblies are sleeved thereover, after which the retainer rings |50 are applied to the grooves of the eccentric shaft to retain the assemblies from longitudinal movement. The gasket rings 202 are then mounted in recesses of the stators and preferably cemented in position to encompassthe intake and discharge ports |96 and |91. The counterweights |63 are then applied to the ends of the shaft followed by the anti-friction bearings |41 and |48 and the seal ring assembly |44.

The entire shaft assembly is then inserted into the lower section of the pump casing so that the ports in the stators register with the openings in the casing. The counterweights maythen be adjusted and secured by the set'screws |66 to provide dynamic balance.

The top section of the casing is then set in place withthe gasket |39 in the grooves of one of the sections. The parts of the casing are then drawn tightly together by the fastening devices |40 thus clamping the outer races of the shaft bearings |41 and |48 and the stators firmly in position.

A lubricating oil is then poured into the crankcase up to the level of the opening for a plug 2|2. The lubricating oil is preferably of light weight and serves the dual purpose of lubricating the outside of the liners |12 where they contact and rub slightly the tapered surfaces of the eccentric pistons and to lubricate the anti-friction bearings. After insertion of the lubricating oil, the plug is applied in the opening so that the lubricating oil is retained in the casing with all the working parts of the pump submerged. The inlet and outlet connections for the pump are then connectecl` with suitable ducts through which fluid to be acted upon by the pump is admitted to the inlet side, and discharged under pressure from the outlet side. The projecting end of the shaft is connected in any suitable manner to a source of power to effect rotation thereof.

The crankshaft of the pump may be rotated in either 'direction and as the shaft rotates, the eccentric pistons are forced to execute such motion that each point thereof traverses in phase a circle of diameter equal to twice the eccentricity crank |53 in a plane perpendicular to the crankshaft axis. The liners are thus caused to be pressed tightly against the inner surfaces of the stators forming a pressure-tight seal across the piston chambers or ducts betweenthe inlet and outlet ports which seal traverses around the chambers in phase with the eccentrics on the crankshaft to force the iluid being pumped from the inlet ports into the outlet ports.

The two eccentric pistons operating 180 out of phase causes a substantially uniform flow of fluid. The loose portions of the liners adjacenlt the tapered portions of the pistons cross the sides of the piston chambers and flex to and from contact with the inward tapers |98 of the stators and points thereon traverse approximately the surface of a cone, the apex of which is stationary where the liners are secured to the stators. The end flaps of the liners, that is, the moving portions thereof, flex inwardly into the spaces between the pistons and the wedges |83 somewhat as described in the first form of the invention. Stresses are partially relieved from these flaps and the circular flexing section of the liner through engagement ofthe rollers 204 with the teeth on the guides |9|.

To take the pump apart for maintenance purposes, it is only necessary to remove the fastening devices |40 and lift the upper section of the casing from the lower section. The inlet and outlet piping to the pump need not be disturbed. The crankshaft asssembly can then be lifted out of the lower section of the casing and the two pump assemblies removed from the ends of the shaft, after which the pump assemblies may be repaired or new assemblies installed as previously described.

From the foregoing it is obvious that I have provided a simple, light-weight pump structure which has a large capacity at relatively low speed and which is adapted to operate on fluids which contain abrasives such as the drilling fluidl used in drilling of wells. It is also obvious that the apparatus illustrated and described may be" adapted to actuate as a motor by supplying an operating fluid under pressure to the inlet thereof so that the fluid will effect actuation of the eccentric shaft.

What I claim and desire to secure by Letters Patent is: f t

1. An apparatus of the character describedincluding, a. casing, a shaft, means rotatably mounting the shaft in the casingI an eccentric on the shaft, a cylinder supported on the eccentric, sleeve-like liners removably mounted within the casing and upon the circumference of the cylinder, a flexible duct having opposite walls connected with the sleeI e-like liners, said case llaving inlet and outlet onnections with the respective ends 0f shaft t0 effe gyraticn of the axis of the cylinder about the ax s of the shaft incidental to rotation of the eccentric, to effect progressive expansion and contraction of the duct about the cylinder.

2. A device lof the character described including, a case, a subbase mounted on the case and having spaced ports, a manifold base having ports registering with the ports in thesubbase,l flanges encircling said ports, a substantially horseshoeshaped duct formed of flexible material and having a side wall connected with the case, a shaft, means rotatably mounting the shaft concentrically of the case, an eccentric on the shaft, a cylinder carried by said eccentric for supporting the opposite wall of the duct and necks on the end*v of said ducts engaged between said flanges, means connecting the manifold base with the subbase to effect a leak-tight connection with said nccks,V and means for rotating the shaftto effect lgyration of the axis of the cylinder about the axis of the shaft and progressive contraction and expan- 'sion of the duct incidental to rotation of the eccentric.

3. A device of the character described including, a case, a subbase mounted on the case and having spaced ports, a manifold `base having ports registering with the ports in the subbase, flanges encircling said ports, a substantially horseshoe-shaped duct formed of flexible material and having a side connected with the case, a shaft, means rotatably mounting the shaft concentrically of the case, an eccentric on the shaft, spaced bearings on the eccentric. a cylinder carried by said bearings for supporting the opposite wall of the duct and necks on the end of said ducts engaged between said flanges, means connecting the manifold base with the subbase to effect a leak-tight connection with said necks, and means for rotating the shaft to effect gyration of the axis of the cylinder about the axis of the shaft and progressive contraction and expansid du and means for rotating the\f 'I siori'of the duct incidental -to rotation of the eccentric.

4. In anv apparatus of the character described including inner and outerannular members cooperating to provide a space between said members, means including flexing portions closing ends of said'space and having connection with the members to provide a. duct between said members, inlet andy outlet connections in said duct,

means supporting said members with one of the membersin eccentric relation to the other for providing a restriction in said duct, one of said .members being movable relative to the other for advancing said restriction from one of said connections toward the other, an annular guide on one of the members having spaced teeth arranged vcircumferentially about the axis of said member, and means carried by the other member for engaging in the spaces between said teeth for preventing relative rotation of said members.

5. In an apparatus of the character described including an annular stator, an annular piston within the stator to provide` a space between said l pist/,on and stator, means including exing portions `closing ends of said space for forming a substantially annular duct, inlet and outlet connections with said duct, means supporting the piston in eccentric relation to the stator for providing a restriction in said duct, means for rtating said supportingfmeans for advancing said restriction from one of said connections toward the other, and means on the piston having intermeshing connection with the stator for preventing rotation 'of the piston within the stator.

6. In an apparatus ofthe character described including an annular stator, a sleeve-like piston in the stator and cooperating therewith to provide a space therebetween, a flexible liner xed circumferentially of the piston and having ilexing portions closing ends of said space and cOnnected with the stator to provide a duct between said members, said stator having inlet and outlet openings aps on said liner having connection with'the stator intermediate said openings, means supporting said piston ineccentric relation with @stator wherr the piston assembly is inserted in said section, a semi-cylindrical cover section `for said base section for closing over the top'of the pump assembly, gasket means between said piston assembly and the basesection for sealing about said' ports and registering openings, and fastening 'devices' for drawing the sections together aboutv the piston assembly.

Number Name Date 1,765,360' Baumann June 24, 1930 2,246,487 `Fraser June 17,1941 2,251,235 Weydell July 29, '1941 2,403,572 Wittenberg July 9, 1946 FOREIGN PATENTS Number p Country Date 8. In a device of the character decribed, a shaft having an eccentric portion and spaced bearing portions at the ends thereof, anti-friction bearings on the bearing portions of said shaft, a sleeve-like piston on the eccentric portion, an annular stator encircling the piston and having an inner diameter to provide a space therebetween, said stator having spaced ports connected with said space, a flexible liner attached to the piston and having flexible side portions attached to the stator, flaps on ends of the liner and anchored to the lstator intermediate said ports, a housing including a base section having openings registering with the ports of the stator, gasket means encompassing the ports and said Openings to effect a seal between the stators and saidJOase section, a cover section for said housing extending over the top of the stator, said cover and base section having recesses for receiving the bearings,

and fastening devices for drawing the sections together to clamp the stator from movement in said housing.

9. An apparatus of the character described including, an outer annular member, an inner annular member cooperating with the outer annular member to provide a space therebetween, resilient means fixed circumferentially to one of the members and having flexing flanges closing the sides of said space and xed to the other member to provide a duct between said members lfor passage of fluid, uid inlet and outlet connections on the outer annular member for said duct, ap means on the resilient means and anchored to said other member for forming a division between the inlet and outlet connections, means supporting the outer of said members in xed position, an eccenltric supporting the inner annular member with NORVEL DOUGLAS.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Great Britain 1938`

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