US2025771A

US2025771A - Pump mechanism

Info

Publication number: US2025771A
Application number: US699325A
Authority: US
Inventors: John W Purvis
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-11-23
Filing date: 1933-11-23
Publication date: 1935-12-31
Anticipated expiration: 1952-12-31

Description

Dec. 31,1935. w PURV|$ 2,025,771

PUMP MECHANISM Filed Nov. 25, 1-955 4 Sheets-Sheet 2 INVENTOR.

Dec. 31, 1935. J, w, U W 2,025,771

PUMP MECHANISM Filed NOV. 25, 1935 4 Sheets-Sheet 5 INVENTOR.

A ORNEY.

Dec. 31, 1935. J w, PURVls 2,025,771

PUMP MECHANISM Filed Nov. 23, 1933 4 Sheets-Sheet 4 IN VEN TOR.

BY I

fl y; 5

A RNEY.

Patented Dec. 31, 1935 UNITED STATES smear or ies 20 Claims.

My invention relates to improvements in variable stroke pumps in which pistons operate in conjunction with cylinders; and the objects of my improvement are, first, to provide a pump adapted to provide a variable displacement of the medium being pumped; second, to provide a pump with means for adjusting the position of its cylinders to accomplish a variable discharge of the medium being pumped; third, to provide a pump with a piston carrier member adapted to move as a unit relative to cylinder members to enable the pistons supported by the carrier member to efiect a displacement of the medium being pumped; fourth, to provide a pump having a member provided with a plurality of cylinder portions connected with a distributing valve mounted internally relative to the cylinder portions; fifth, to provide a pump having an adjustable member adapted to move a valve and cylinder 1 member transversely relative to the driving axis of the pump to vary the displacement of the pump; sixth, to provide a pump with a plurality of rotating cylinder members having their axes located out of alignment and connected by driving means permitting a uniform rate of motion of the rotating cylinder members; seventh, to provide a pump having an adjusting means adapted to optionally control the flow of the medium being pumped in opposite or reverse directions while operating or rotating in one continuous direction; eighth, to provide a pump operated by a driven shaft, with adjusting means adapted to permit the pump to be operated in a manner whereby the driven shaft will become a driving shaft; and ninth, to provide a pump with a single adjusting means adapted to control the displacement of the pump when constructed either as a single unit with four cylinders or as a double unit with eight cylinders.

I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure l is a plan View of the pump installed as a single unit in a housing shown without its 3, together with a partial vertical section through the pump, said vertical section being taken on the line l 3; Fig. 5, a plan view of the pistons, cylinders, and valve together with a partial plan view of the adjustable valve and the housing, the pump mechanism thereoi being disclosed in a neutral position; Fig. 6, a sectional view of the pump mechanism disclosed in Fig. 5, said sectional View being taken on the line 65, Fig. 5; Fig. '7, a plan view of the pistons, cylinders, and valve, together with a partial plan view of the adjustable valve and the housing I, the cylinders thereof being disclosed as having been shifted off center by the adjusting mechanism; Fig. 8, a sectional view of the pump mechanism disclosed in Fig. 7, said sectional view being taken in on the line 8-8, Fig. 7; Fig. 9, a sectional view through the pistons, cylinders and valve as disclosed in Fig. 8, the position of the cylinders having been displaced by the pump moving through an angle of thirty degrees from the position disclosed in Fig. 8; Fig. 10, a sectional view through the pump mechanism disclosed in Fig. 8, the position of the cylinders having been displaced by the pump moving through an angle of forty five degrees from the position disclosed in Fig. 8; Fig. ll, a sectional view through the pump mechanism disclosed in Fig. 8, the position of the cylinders having been displaced by the pump moving through an angle of ninety degrees from the position disclosed in Fig. 8; Fig. 12, an end viewof a piston carrier together with the pistons assembled thereon; Fig. 13, a side view of the piston carrier and pistons disclosed in Fig. 12; Fig. 14, an end view of a valve member used in the pump when installed as a single unit; Fig. 15, a plan view of the valve member disclosed in Fig. 14; Fig. 16, an end view of one of the cylinder blocks; Fig. 17, a side view of the cylinder block disclosed in Fig. 16; Fig. 18, a side View of a driver'member for the piston carrier and cylinder blocks; Fig. 19, an end view of the driver member disclosed in Fig. 18; Fig. .20, an end view of one of the cylinder blocks; Fig. 21, a side view of the cylinder block disclosed in Fig. 20; Fig. 22, an end View of a valve member used in the pump when installed as a double unit; Fig. 23, a plan view of the valve member disclosed in Fig. 22; Fig. 24, an isometric View of an alternative design of the piston carrier and cylinders, together with the driver member iorthe piston carrier and cylinders and also the Valve adjusting mechanism before said parts are assembled together; Fig. 25, a plan view of a partial portion of the pump mechanism disclosing another alternate design of cylinders located on the center line of drive shaft instead of being ofiset; and Fig. 26, a sectional view through the pump mechanism disclosed in Fig. 25, said sectienajil view being taken on the line 26--26, F g. 25. Similar numerals refer to similar parts throughout the several views. r

The housing I in Figs. 1 and 2 is provided with the bore 2 in which is mounted the bushing or bearing member 38, in which in turn is suitably mounted the valve member 3 which extends within the bore 4 of the cylinder block 5, the cylinder block 5 being provided with the keyway 6 which is adapted to receive the driving member I which is constructed of a suificient width to enter therein and act as a key to drive the cylinder block 5. The driving member 1 is provided with the bore 8 in which fits the drive shaft 9 and in which is mounted the key It for engaging the keyway II of the driving member 7. The driving member I may be provided with the extension boss or hub I2 to provide sufiicient stock for mounting the key I and to further provide additional length of the bore '8 to provide sufficient bearing on the drive shaft 9, the cylinder valve -3 being provided with the counterbore I3 to receive the huh I2.

'The drive shaft 9 extends through and fits within the bore id of the valve member 3.

The piston carrier is provided with the bore I6 which permits the drive shaft 80 to extend therethrough when a double unit installation is prlovi'ded, a-s Figure 3. v i i The piston carrier I5 is provided with the body portion IT in which are constructed the keyways or grooves I sand I19, said keyways IB and I9 being disposed on opposite sides of the body portion II relative to one another, said keyways i3 and I9 being farther disposed at right angles relaare to one another.

'i's provided with the

cylinder bores

23 and 2 5.

The pistons or

plunger members

25 and 25 are provided with the shank portions 2'1 which are suitably secured to and mounted in the bosses 2 8 of the piston carrier E5, the

pistons

25 and 26 respectively and sli'dably operating in the cylinder bores 2! and 22 of the cylinder blocks 5. In a. similar man-her the shank portions 2! of the pistons or plunger members 29 and 3B are suitably secured in the bosses 28 of the piston carrier I5, the

pistons

29 and 39 respectively and slidably operate in the

cylinder bores

23 and 2% er the cylinder block 26. The cylinder block 23 is provided with the bore 3! in which is mounted one of the valve members 3A when a single unit of the mechanism is used as disclosed in Figs. 1 z'ajnd '2, said second valve member 3A being in turn suitably secured and mounted in the adjusting member 33 which is 'slid'ably mounted in the boss 3 4 of the housing I, the second valve member 3A not requiring the 'counterbor'e 13 which is providedih the valve member 3.

The boss 34 is provided with the groove 35 in which the'baseof the adjusting member 33 slidably fits, the base of the adjusting member 33 being provided with the shoulder portion 355 which engages and is retained by the plate 31 which is secured by the screws 38. The adjustins member 33 is provided with the boss portion 39 having the bore 40 'therethrough, in which the s'ecoi'idvalve member 3A is suitably mounted, the

valve *member 3A being adapted to be moved 'with the adjusting member 33 when it is slidably operated in the groove 35.

The valve members3 andi3A'are each provid and 49.

with the ports 4| and 42 which are machined around a portion of the periphery of the valve member 3, the ports 4| and 42 being separated by the blank spots or lands 43, the blank spots or lands 43 being located diametrically opposite one 5 another to separate the ports 4| and 42.

The port M of the valve member 3 connects with the passage M which in turn connects with the passage &5, the passage 45 being connected with the connection or coupling portion 45 in which is secured the intake pipe 47. The port 42 of the valve member 3 is connected to the passage 48 which in turn connects with the passage M-l which in turn connects with the connection or coupling member 50 in which is secured the outlet conduit or pipe 5|, the connection or coupling members 4% and 50 being suitably secured in the ends of the valve member 3.

The second valve member 3A is similarly provided with the ports GI and 42 which are respectively connected with the passages 34 and 68 which are in "connected with the passages '45 The outer ends of the

passages

45 and 49 in the second valve member 3A may be closed by the plugs 52. The adjusting member 33 is provided with the

shaft portions

53 and 54 which are slidably supported in the bosses 55 or the housing I and in the bosses 55A which form a portion of the bracket 59. The

bosses

55 and 55A are respectively connected with the inlet pipe 5'? and the outlet pipe 58.

The bosses 55A are constructed in the bracket 59 which is removably mounted by means of the flange Gilwhich is secured to the housing I by the screws (it, the bracket 59 being provided with a pilot portion which is supported in the bore 52 of the housing I. The bracket member 59, being 'removabiy mounted in the housing i, permits the adjusting member 33 to be moved sufiic'iently to one side to disengage the shaft portion 54 from the bosses 55 of the housing 5, thus permitting the adjusting member 33 to be lifted jointly out through the top opening of the housing I, it being understood of course that the inlet pipe or conduit pipe 5'! will be disconnected in this disassembling operation.

In a similar manner the bushing or bracket member 36 is provided with a pilot portion for fitting within the bore 2 of the housing I, the bushing 36 being further supported by the flange 63 which is secured to the housing I by the screws E i.

The

shaft portions

53 and 5 5 of the adjusting member 33 are provided with passages and G6, the passage 65 being closed at its outer end by 5 the plug 61. The passage 65 connects the port M in the second valve member 8A with the passage 58 which extends transversely through the shaft portion 5-3 to connect with the recess or undercut portion t9 which connects with the passage I2 and thus with the inlet conduit or pipe 57. In a similar way the passage 66 connects the ports 42 in the 'valve member 3A with the passage I0 which extends transversely through the shaft portion 54 to connect with the recess justably moved longitudinally through its length or range of adjustment and at the same time will always maintain connections respectively with the passages I2 and I3.

It is also to be noted that the ports M and 42, being extended around for the greater portion of the periphery of the

valve members

3 and 3A will always maintain connections respectively with the cylinderbores H, 22, 23 or 24 of the cylinder blocks while rotating according to the cylinder block in which the

valves

3 and 3A may be assembled.

It is to be noted that the cylinder bores 2| and 22 of the cylinder block 5 will be so machined that they will break through and be connected with the bore 4 of the cylinder block 5 at the points I5 and 14. In a similar way the cylinder bores 23 and 24 of the cylinder block 2|] will be so constructed that they will break through and connect with the bore 3i at the points I5 and I1.

Figures 12 and 13 disclose the manner in which the pistons are assembled to the piston carrier I5. The

pistons

25, 25, 29, and 30 are provided with the shank portions 21 as above mentioned, said shank portions fitting within the slots I8 of the portions 28 to permit the pistons to be slidably mounted in the slots I8, the shank portions 21 being suitably threaded to engage the nuts I9 to secure them in place.

It is to be noted that the piston carrier I5 will thus be provided with two pistons on each side, which are parallel to the keyway located on their respective sides of the piston carrier I5, the longitudinal centers of the pistons and the keyway, on each side of the piston carrier l5, being located at 90 of the longitudindal center of piston and keyway on the opposite side of the piston carrier I5.

It is to be noted that after the pistons are placed in the

cylinder blocks

5 and 20, the piston carrier I5 may then be slidably moved with respect to the driver or keyways, the piston carrier i5 then being adapted to slide either way on the keyways thereof to accomplish a change in the piston displacement of the pump mechanism.

It is to be noted that each cylinder block 5 and 253 will be provided with its own separate valve and each valve cooperates with two pistons only.

Figures 5 to 11 inclusive disclose the main operative parts of my pump mechanism when installed as a single unit,that is, when used for operating four pistons in four cylinders which designate a one unit installation.

Figures 5 and 6 disclose the single unit pump mechanism in its neutral position, the piston carrier I5 supporting two pistons which operate in the cylinder portions of the cylinder block 20 and two pistons which slidably operate in the cylinder portion of the cylinder block 5.

These Figs. 5 and 6 also disclose the

valves

3 and 3A for the respective cylinder blocks, together with the driven member operatively mounted between the piston carrier I5 and the cylinder block 5, the drive shaft 9 extending through the valve 3 and into the drive member I, with which it is operatively connected, the valve member 3 forming a bearing for the drive shaft 9.

The valve member 3A is mounted and carried independently, as hereinabove described, on the adjusting member 33 which, together with its

shaft portions

53 and 54 may be suitably connected to and operated by manually or power operated means, such as cams, screws or hydraulic means, to provide the necessary mechanism for actuating the adjusting member 33.

It is to be noted that any amount or distance that the adjusting member 33 and its shaft po'rtions 53 and 54, together with its valve member 3A, is moved off the center of the drive shaft 9, either way, will accomplish a changing of displacement of the pistons carried by the piston 5 carrier I5 and consequently accomplish a change in the flow of the medium or agent which is being pumped or displaced by the pump mechamsm.

Figure 6 discloses the pump mechanism in a neutral position in which the

valves

3 and 3A coincide, or in other words are in alignment so that rotation of the piston carrier I5, together with its pistons when rotated, will produce a zero discharge or displacement. 5

Figures 7 and 8 disclose the cylinder member 20 as having been shifted off the center or in other words, misaligned, relative to the drive shaft 9, downwardly, as viewed in Figure 8. In moving the cylinder member 20 off the center, 20 as above described, and as disclosed more clearly in Figure 8, the key portion 2IA remaining in a vertical position and with the shaft movement being in a horizontal direction, the

pistons

29 and 30 which operate in the cylinder portions of 5 the cylinder member 20, did not change their displacement relative to their associated cylinder portions.

However, the piston carrier I5 will have been moved by the above described movement of the 30;

cylinder member 20 so that the

pistons

25 and 23, supported by the piston carrier I5 and operating in the cylinder portions of the cylinder member 5, will have changed their displacement to a full .out. stroke in the cylinder portions of the 35.

cylinder member 5. If the above described offset movement of the cylinder member 20 had been made in an opposite direction as viewed in Figure 8, a reverse flow of the medium or agent being pumped, would have been the result in the cylin- 30 with it to change their relations with their associated pistons to the full out stroke in the vertical cylinder portions 23 while the piston 3!! will have been moved to the upper portion of the cylinder portion 24 in the upper portion of the cylinder block 20.

It is to be further noted that the portion of the piston 29 as disclosed in Figure 8 corresponds to the end of the compression stroke whereas the piston 30 is disclosed as being at the end of its suction stroke or at the beginning of its compression stroke.

It is also to be noted that if the above offset adjusting movement had been upwardly as viewed in Figure 8, instead of downwardly, a reverse flow of the agent or medium being pumped would have resulted in the

horizontal cylinder portions

23 and 24, or in other words, the relative portions of the

pistons

29 and 30 would have been reversed relative to their associated

cylinder portions

23 and 24. (35v 9 is not in alignment therewith, thus permitting the operative motion of the above mentioned parts to drive the piston carrier I5 from the center line of one valve to the center line of the other valve with each of rotation.

Figure 9 discloses the above described mechanism with a consequent displacement caused by a rotation from the position disclosed in Figure 8 through 30 angular motion. Similarly; Figure 10 discloses the valve mechanism as having been rotatively advanced from its position at 30 in Figure 9 to 45 in Figure 10, whereas Figure 11 discloses the pump mechanism as having been further rotatively advanced to a full 90 from the position as disclosed in Figure 8, or 45 beyond the portion disclosed in Figure 10.

It is to be understood that any intermediate adjustment of the valve mechanism will reduce the flow or discharge of the medium'or agent to be pumped from a maximum to zero, and an adjusting movement to the opposite side of the center of the drive shaft 9 will change the flow of the medium or agent being pumped to an opposite direction or reverse flow from zero tomaxi mum capacity.

It is also to be noted that my pump mechanism may be constructed with its valve member located in full offset and permanent positions and with no means for adjustment thereof, said mechanism thus being capable of being used as a driven unit from and connected with other similar units provided with adjustable means. With an adjustable unit such as disclosed in Figures 1 and 2 and operatively driven by power means such, as an electric motor or similar power mechanism, at constant speed, said adjustable unit can be so positioned as to drive the above mentioned unit with its valves in permanent positions, at any variable speed, from zero to maximum speed in either direction.

Figures 3 and 4 disclose my pump mechanism when installed as a double unit, each provided with four pistons operatively mounted in their four associated cylinder portions to provide displacement and with the drive shaft 80 extending entirely through both of the units and the valve members 3 at each of its ends, the drive shaft 80 being connected with a valve member 3, cylinder member 5, drive member I and piston carrier 20 in each group of pumping members located on opposite sides of the valve adjusting mechanism which is located at the transverse central portion of the housing 8| with a double unit installation, instead of adjacent the end of the housing I, as disclosed in Figure 2.

It is to be noted that whereas the piston carrier I5 may be constructed without a central bore in the single unit installations as disclosed in Figures 1 and 2, it is necessary to provide the piston carrier with a central bore as disclosed in Figures 12 and 13 when my pump mechanism is constructed with a double unit installation to permit the piston carrier 55 to move transversely relative to the drive shaft 86 which extends all the way through both of the pump units in order to provide driving means from one 'end of the drive shaft 80 to the other end of the double unit installation, the drive shaft 89 being disclosed in Figures 3 and 4 as being provided with the flange coupling 86 which is suitably secured to the drive shaft 88 and adapted to permit driving connection with suitable driving means operatively connected with suitable power means used for driving the pump mechanism.

When my pump mechanism is used in the double unit installations as disclosed in Figures 3 and 4 it is necessary to use the valve member 8'! as disclosed in Figures 22 and 23.

The valve member 81 is mounted in the adjusting member I05 and is adapted to move therewith, the valve member B'I being provided with the

ports

88 and 89 connecting respectively with the passages 96 and iii, the passages 99 and SI connecting respectively with the

passages

92 and 92A which extend longitudinally through the valve member 81, the ends of said

passages

92 and 92A being suitably plugged or closed. The

ports

88 and 89 are thus connected with the cylinder portions of one of the cylinder blocks operatively mounted in one of the pumping units while the

ports

93 and 94 at the other end of the valve member 81 will connect the cylinder portions of the other of the cylinder blocks in the pump unit with the

passages

92 and 92A by means of the

passages

95 and 96. cylinder portions of both of the cylinder members oppositely disposed about the adjusting mechanism in the transverse central portion of the housing 8i of the double unit installations will be connected with the passages 9? and 538 which are further connected with the passages 99 and I99 which connect with the passages IEH and 32 of the shaft portions I93 and we of the adjusting member H35 of the double unitrinstallation as disclosed in Figures 3 and 4.

The passages ISI and I62 connect with the inlet conduit or pipe Iilii and the outlet conduit or pipe It? in a similar way to that described relative to the inlet and

outlet pipes

51 and 58 in Figures 1 and 2. 7

It is also to be noted that the valve member 81 will be provided with the elongated slot I88 to permit the valve member 8? to be moved by the adjusting member I55 transversely relative to the drive shaft 88 which extends therethrough.

Figure 24 discloses an isometric View of various parts of my pump mechanism in alignment preparatory to final assembly in the operating unit. The cylinder blocks I09 and I I l! thereof are made with a slightly different construction although possessing similar operative principles on which the pump mechanisms, as above described, operate. In the construction as disclosed in Figure 24 the cylinder blocks I69 and III}, instead of being respectively provided with the keyway 6 and the key ZIA, as disclosed relative to the

cylinder blocks

5 and 28 are respectively provided with the extension or lug portions III, H2, H3, and I I4. The piston. carrier I 55 is provided with It will thus be noted that the the slot or keyway IIB for engaging the lug H3 of the cylinder block HO, the piston carrier H5 being further provided with the slot or keyway II! for engaging the lug H4 of the cylinder block H0.

In a similar way the cylinder block I09 is provided with the lugs I I I and i I2 for engaging the slots II 6, located on opposite sides and at right angles relative to the slots H6 and III of the piston carrier I I5. The piston carrier H5 will be provided with a central opening I IS, the wall surfaces of which are adapted to receive and engage the surfaces of the drive member I I9 which thus acts as a key or drive member for transmitting the drive thrust to the piston carrier H5 which, when the cylinder block H3 isrlocated, in an adjusted or offset position relative to the axis of the driving member H8, will cause the piston carrier H5 and its supported pistons to operatively dis III] in a similar manner to that as disclosed relative to the above described pump installations.

It is to be noted that the various parts of the construction as disclosed in Figure 24 have the same numerals as the similar parts which are disclosed in the preceding designs.

Figures 25 and 26 disclose another alternative construction in which the cylinder blocks I20 and HI may be constructed if desired with their respective cylinder portions I22, I23, I24, and I25 located on the center of the drive shaft I26, the piston carrier I21 being provided with suitable key, extension, or lug portions for engaging suitable slots or keyways in the respective cylinder blocks I20 and I2I. The piston carrier I21 will be provided with piston members which operate in a similar manner and on the same principles as in the above mentioned mechanisms, and the pistons can be placed at any intermediate point between the locations shown in Figs. 1, 3, 24, and 25.

The construction as disclosed in Figures 25 and 26 thus permit the center line of the pistons and their associated cylinder portions to be located on the center line of the drive shaft where desired and where the installation will permit a mechanism to be installed in a larger space, this construction requiring a slightly larger operating space for the revolving members thereof as the piston members of this construction must be placed on the outside of the valve members thereof, the cylinder portions being connected by suitable passages with the valve members thereof, in a similar way to that described in the above mechanisms. The construction as disclosed in Figures 25 and 26 also possesses the advantage of providing a balanced design in which the thrust of the various driving members is always exerted in line with the axis of the drive means, whereas in the above mentioned alternative constructions, the pistons will be offset with a consequent application of driving force at points removed from the center line of the driving means.

It is further to be understood that when it is desired to lock the adjusting means as above disclosed in permanent positions to permit the pump installation to be operated as a driven unit, the various housings may be provided with suitable holes or openings to permit the installation of locking means for engaging the adjusting means thereof or their attached shaft portions to provide the necessary means for locking the adjusting mechanism of my pump.

I claim:

1. In a pump mechanism, the combination of a housing, a valve member suitably mounted in said housing and provided with a pair of oppositely disposed ports extending peripherally thereon, said pair of ports being separated at their ends by a land on said valve member, said valve member being further providedwith inlet and outlet passages connecting with said ports, a cylinder block revolvably mounted on said valve and provided with cylinder portions connecting with the ports of said valve member, an adjusting member movably mounted in said housing and provided with inlet and outlet passages extending therein, a second valve member suitably mounted in said adjusting member and adapted to move therewith, said second valve member being provided with a pair of oppositely disposed ports extending peripherally thereon, said pair of ports being separated at their ends by a land on said second valve member, said second valve member being further provided with inlet and outlet pa'ssage's connecting with said ports and with the inlet and outlet passages of said adjusting member, a second cylinder block revolvably mounted on said second valve member and adapted to move therewith to vary the displacement 5 of the pump mechanism, said second valve member being provided with cylinder portions connecting with the ports of said second valve member, a piston carrier mounted on said first mentioned and said second cylinder blocks and adapted to drive said cylinder blocks, pistons suitably mounted in said piston carrier and adapted to operate in the cylinder portions of said cylinder blocks to displace a medium through the passages of said valve members and said adjusting member, a drive shaft suitably mounted and extending through said first mentioned valve member, said drive shaft being operatively connected with said piston carrier, and means for conducting said medium to and from the passages of said first and said second mentioned valve and said adjusting member.

2. In a pump mechanism, the combination of a pair of cylinder members revolvably mounted and. each provided with a pair of cylinder chambers extending longitudinally in parallel planes oppositely disposed about the axis of said cylinder member, piston members adapted for movement in said pair of cylinder chambers to displace a medium, means connecting said piston members and moving therewith, said means being reciprocatingly mounted on said cylinder members, and means for adjusting the position of said pair of cylinder members relativeto said piston members to vary the amount of said medium being displaced.

3. In a pump mechanism, the combination of a valve member, a cylinder member revolvably mounted on said valve member and provided with 40 a pair of cylinder chambers extending longitudinally in parallel planes oppositely disposed about the axis of said cylinder member, piston members adapted for movement in said cylinder chambers to displace a medium from saidcylinder member to said valve member, means operatively connecting said piston members to cause reciprocating movement thereof, said means being mounted to reciprocate in a plane extending transversely through the axis of said cylinder member, and means for adjusting the position of said valve and said cylinder members relative to said piston members to vary the displacement of said piston members.

4. In a pump mechanism, the combination of a pair of rotatably mounted cylinder members, a piston carrier mounted on said cylinder members and adapted to rotate therewith, said piston carrier being provided with a pair of pistons movably mounted in each of said cylinder members, said piston carrier having a' hub portion extending between and spacing said cylinder members axially, means for driving said piston carrier, and means for displacing one 'of said cylinder members relative to the axis of the 5 said pair of valve members and each slidably connected with one of said key portions of said carrier member, said cylinder members being adapted to rotate with their axes out of alignment, said cylinder members being provided with cylinder spaces connected with said valve members, a pair of piston members suitably mounted in each pair of said oppositely disposed bosses of said carrier member and adapted to move in said cylinder spaces of said cylinder members to displace a medium being pumped, each of said pair of piston members extending longitudinally in planes located parallel with one of said key portions of said carrier member, and means for driving said carrier member.

6. In a pump mechanism, the combination of a driving member provided with pairs of pistons, said driving member being revolvably mounted, a pair of cylinder members revolvably driven by said driving member and each provided with cylinder spaces adapted to receive a pair of said pistons, said cylinder members being oppositely disposed about and axially spaced by said driving member, and means for adjusting the position of one of said cylinder members relative to said driving member to vary the displacement of the pumping mechanism.

7. In a pump mechanism, the combination of a pair of cylinder members revolvably mounted and each provided with a pair of cylinder spaces extending longitudinally at right angles to the axes of said cylinder members, coupling means for driving said cylinder members, said coupling means being adapted to rotate, said coupling means being provided with pistons extending into said cylinder spaces to displace a medium being pumped, said coupling means being provided with a hub portion extending between and spacing said cylinder members, and means for driving said coupling means.

8. In a pump mechanism, the combination of a housing member, bracket members mounted on said housing and each provided with a bore, a cylindrical member mounted in the bore of each of said bracket members and provided with passages, a cylinder block rotatablymounted on one of said cylindrical members and provided with cylinder spaces oppositely disposed about the axis of 'said cylinder block, a second cylinder block rotatably mounted on the other of said cylindrical members and provided with cylinder spaces oppositely disposed about the axis of said second cylinder block, said cylinder spaces of each of said cylinder blocks connecting with the passages of one of said cylindrical members, a piston carrier slidably mounted on said cylinder blocks and provided with key mechanisms engaging said cylinder blocks, said key mechanisms extending at right angles with one another, pistons mounted in said piston carrier and entering the cylinder spaces of said cylinder blocks, the pistons in the cylinder spaces of each cylinder block extending longitudinally in parallel planes with the key mechanism of said cylinder block, and means for rotating said cylinder blocks and said piston carrier.

9. In a pump mechanism, the combination of a pair of valve members mounted and provided with passages for conducting a medium to be pumped, a pair of cylinder members rotatably mounted on said valve members and provided with bores connecting with the passages of said valve members, said bores of each cylinder member ex-' tending longitudinally in parallel planes located on opposite sides of the axisof said cylinder memben'piston members extending in said bores of said cylinder members, a carrier member fixedly connected to and supporting said piston members, means operatively connecting each of the opposite sides of said carrier member with one of said cylinder members to enable said cylinder members and said carrier to be rotated together, said means comprising a body portion having a pair of key portions extending substantially at right angles with one another and each engaging one of said cylinder members, said means permitting said carrier to be slidably moved in a pair of planes extending at right angles with one another and parallel with said pistons, and means for driving one of said cylinder members with a rotary motion, said last mentioned means driving said carrier and the other of said cylinder members through said first mentioned means.

10. In a pump mechanism, the combination of rotatably mounted cylinder members, a carrier member solely connected with said cylinder members and extending between and spacing said rotatably mounted cylinder members, the connection with said cylinder members enabling said carrier to be reciprocated on said cylinder members in planes extending at right angles to one another, pistons solely connected to said carrier member and extending longitudinally in said cylinder members in planes located parallel with said planes of reciprocating movement of said carrier member, said pistons being solely actuated in reciprocating movements by said carried member, means for driving said cylinder members and said carrier member, and means for conducting a medium, being pumped, to and from said cylinder members.

11. In a pump mechanism, the combination of a valve member suitably mounted and provided with conduit passages together with a bore, a cylinder member provided with bores connecting with the conduit passages of said valve member, said cylinder member being provided with a keyway extending transversely relative to its axis, a carrier member provided with piston members movably mounted in the bores of said cylinder member, said carrier member being provided with a keyway extending parallel with the keyway of said cylinder'member, said carrier member being further provided with a keyway extending substantially at right angles to its first mentioned keyway, a second valve member suitably mounted and provided with conduit passages, a second cylinder member suitably mounted on said second valve member and provided with a key engaging a keyway' of said carrier member, said second cylinder being provided with bores engaged by said pistons of said carrier member, said bores of said second cylinder member being connected with the conduit passages of said second valve member, a driving member engaging the parallel keyway's of said first mentioned cylinder member and said carrier member, and a shaft member revolvably mounted in the bore of said first mentioned valve member, said shaft member being operatively connected with said driving member.

12. In a pump mechanism, the combination of a housing provided with a pair of oppositely disposed bosses provided with bores therethrou'gh together with conduit passages connecting with each of said bores, said bosses being in alignment, an adjusting member provided with shaft portions mounted in the bores of the bosses of said housing, said adjusting member being adapted to be slidably moved in said bores, said adjusting member being provided with a bore extending transversely therein, said adjusting member being provided with passages connecting its bore with the conduit passages of the bosses of said housing, a valve member mounted in the bore of said adjusting member and provided with conduit passages connecting with said conduit passages of said adjusting member, said valve member having its axis located in alignment with the axis of said adjustment member, a cylinder means rotatably mounted on said valve member and provided with bores, a piston carrier movably mounted on said cylinder means, piston members movably mounted in the bores of said cylinder member, said piston members being fixedly secured to said piston carrier, and means for reciprocating said pistons, and said piston carrier in planes extending at right angles to each other, each of said planes extending parallel with the axis of a pair of said pistons.

13. In a pump mechanism, the combination of an adjusting member movably mounted and adapted for movement in a transverse direction only relative to the axis of the pump mechanism, a valve member suitably mounted in said adjusting member and provided with extension portions at each side of said adjusting member, said valve member being provided with conduit passages, a cylinder member rotatably mounted on each of the extension portions of said valve member and provided with bores connecting with the conduit passages of said valve member, a piston carrier movably supported on each of said cylinder members, piston members extending in the bores of said cylinder members, the piston members in each of said cylinder members extending longitudinally in parallel planes, said piston members being fixedly secured to said piston carrier, and means for revolving said piston carrier to reciprocate said piston members in each of said cylinder members in planes parallel with the axes of said piston members in each of said cylinder members.

14. In a pump mechanism, the combination of a pair of cylinder members rotatably mounted and provided with bores extending transversely relative to their axes, a carrier member suitably mounted to rotate with said cylinder members, said carrier member being provided with a body portion spacing said cylinder members and having lug portions extending adjacent the open ends of said bores of said cylinder members, said carrier member being slidably connected with said cylinder members to prevent movement of said carrier member relative to said cylinder member except in transverse planes relative to the axis of said cylinder members and extending at right angles to one another, piston members suitably secured in the lug portions of said carrier member and extending within the bores of said cylinder members, and means-rotating said piston carrier and said cylinder members causing a reciprocating motion between said cylinders and said piston members to displace the medium being pumped, said piston members moving longitudinally in parallel planes in each of said cylinder members.

15. In a pump mechanism, the combination ofa pair of cylinder members each provided with a pair of cylinder spaces oppositely disposed relative to the axis thereof, a piston carrier supported on said cylinder members and slidably connected therewith, to permit movement, relative to the axes of said cylinder members, only in planes extending at right angles to one another and to the axes of said cylinder members, pistons mounted in said piston carrier and engaging said cylinder spaces, said pistons, in each of said cylinder members, extending longitudinally in planes parallel to each other and to the slidable connection between said cylinder '5 members and said piston carrier, valve members supporting said cylinder members and provided with passages connecting with said cylinder spaces, and means for driving said piston carrier and said cylinder members with a revolving 10 movement to reciprocate said pistons in said cylinder spaces.

16. In a pump mechanism, the combination of a pair of valve members, cylinder members revolvably mounted on said valve members and adapted to guide the medium being pumped into said valve members, a piston carrier movably supported on said cylinder members and extending therebetween to space said cylinder members longitudinally, said piston carrier being supported in eccentric relationship to said cylinder members, pistons mounted in said piston carrier and extending within said cylinder members, and means for revolving said cylinder members and said piston carrier to reciprocate said pistons in said cylinder members.

17. In a pump mechanism, the combination of a pair of valve members provided with passages, a pair of cylinder members revolvably mounted on said valve members and provided with cylinder spaces connecting with the passages of said valve members, means supported on said cylinder members and operatively keyed to said cylinder members to permit movement of said means only in planes extending at right angles to one another and to the axes of said cylinder members, said means being provided with pistons extending into said cylinder spaces of said cylinder members, and means for revolving said means.

18. In a pump mechanism, the combination of a pair of cylinder members'revolvably mounted, carrier means between said cylinder members and slidably connected therewith by key portions extending at right angles with one another and with the axis of said carrier means, pistons in said carrier means and engaging said cylinder members, means for guiding a medium into and out of said cylinder members, means for displacing said carrier means in a transverse direction relative to the axis of one only of said cylinder 5 members, and means for revolving said carrier means and said cylinder members.

19. In a pump mechanism, the combination of a pair of cylinder members revolvably mounted, means supporting one of said pair of cylinder members and adapted for movement in a plane extending transversely relative to and through the axis of the other of said cylinder member, a carrier member slidably mounted between and on said cylinder members and adapted to revolve so therewith, pistons in said carrier member and engaging said cylinder members, valve means suitably mounted and connected with said cylinder members for guiding a medium to and from said cylinder members, and means for revolving 5 said carrier and said cylinder members to reciprocate said pistons in said cylinder members.

20. In a pump mechanism, the combination of a housing provided with a groove and bores extending parallel with said groove, an adjusting member slidably mounted in said bores and provided with a base portion sliding in said groove, a valve member in said adjusting member and having its axis extending transversely to and in a plane extending through the axis of said bores 75.

of id ho sin a wnd va e m mber'i el moqnteq in said housing and having its axis 19? gated in a. plane extending thrqugh the axis (pf said mentioned valve member, a pair of (Syn-11d?! members revolvably mountegi 9n said valve members, a carrier member slidgply mognh 5 n ai eylind r mem er and p rqv d with p swn ten ing With n sa d m nde mem r mea s for i ee ing d a er an a d W1 de r members, am}. ppnduit means connected with said valve members.

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