US2605710A

US2605710A - Radial pump

Info

Publication number: US2605710A
Application number: US64075A
Authority: US
Inventors: William H Mashinter
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-12-08
Filing date: 1948-12-08
Publication date: 1952-08-05
Anticipated expiration: 1969-08-05

Description

Aug. 5, 1952 W. H. MASHINTER RADIAL. PUMP 2 SHEETSSHEET 1 Filed Dec. 8, 1948 IN VEN TOR.

Patented Aug. 5, 1952 UNITED STATES PATENT OFFICE a 7 v, 2,605,710

:RADIAL PUMP H William HLMashinter. Chicago, Ill. ApplicationDecember s, 1948, Serial. No. 64,075

11 .QlaimS. (Cl. -103.3'7)

7 This invention pertains to pump. mechanism,- injector mechanism; or vatomizing mechanism or'semi-diesel type asa means for introducing thereto theheaviengrade ofv liquid fuels such as are commonly used; in engines'of that type. But

the lighter {fuels employed, the higher operating speeds, and the wider. range of speeds and loads I requiredof gasoline: engines present fuel injection pr 0blems thatheretofore have never been satisfac orily-solved.

1 An-object of the presentinvention :is tovprovide a fuel injector partieularly adapted for-use witlyenginesofthe high-speed type, employing lighter'g-rades of fuel such'asr gasoline.

Another-object is to provide a fuel injector'so organized as to producea fully developed readily combustible fuel spraywithin the very minute interval vof time available at high operating speeds.

Another object. of the present invention is to provide a substantially leak proof fuel injection pump. 1

Anotherobject is to provide-a fuel injection pump that is substantially immune to leakage producing wear.

Another obj act is to Provide an 3 improved bellows type of pumpcapable of-withstanding high .pressuresover long periodsxof. use.

Another object ofythe invention'is to" provide automatic enrichi g mechanism and: automatic a pump-for supplying fluid under pressure and in measured quantities :to means for utilizing the supplied fluid. as where fuel issprayed into the cylinderof an engine, or where other liquid, such as water, issprayed into such cylinder for. power orantidetonating reasons.

Another object is to provide injecting means for supplying fuel to, anlinternal combustion engine which may be used with manifold or separate cylinder injection and wherein the fuelis introduced in properly atomized condition over thdentirerange .of operation ofthe engine, i. e.,

regardless loflthe, operating speedotthe engine.

' Another object -.of-the invention .is to provide an injector --for,;supplying' fuel to .an 'intemal combustion engine, wherein a balanced diaphragm is used as the fuel pumping means;

Another object is to provide injecting-means wherein the amount of fluid supplied therefrom is controlled by the pressure of the fluid; delivered to theinjecting means. g H

Another object of the invention isto provide a fuel injector adapted particularly-for mewwith engines of a high. speed type, whether operating on heavy, intermediate, or light grade fuels,-; it

Another object of the invention isto provide an injector so constructed and arranged that .it is not dependent upon anyparticular shape of actuating cam; but various shapes of 1 cams :may

be resorted-.110 as desired, to obtain :a suitable variation of injector output with variations in injector speed. of operation (i. e., engine speed) Another object of. the invention: is to provide an injector so constructed and arranged that under certain conditions-of operation it does-not need, nor is it dependent upon a separate pump for-supplying fuel thereto;

Another object of the invention is-to provide an .injectorsoconstructed that it will operate over-a large range of supply pressures.

Another object of the invention isto zprovide a fuel injector so-constructed and-arranged that a complete degree of load-speed control is had-by virtue of three independent .controlsover the amount of fuel emitted-per. injection,.that-is, (1;)

and (3) speed or injection operation.

Another object of the invention J is to provide .an injector .using ,a controlled balanced. diaphragm form of pump -means for injectionoperation, I a

Another object-is to provide a fuel injector capable of effecting a .moreaccurate control of .mechanicalthrottle, v(2) variable supply pressure the quantity ofrfuel injected throughoutthe-entire range of. engine speeds :and loads;

Another object is :to provide .ina fuelinj'ector improved means for maintaining ithe'isame free of air or other gases.

Another object of the" invention i's 'to p'rovide a fuel injector pump so constructed and' ar'ranged that it can be regulated to supply 1 fuelto: cylinders of an internal combustion engine-"in'a normal'manner, whereby'said'cylinders may-iberfired successively in. their properorder, :or "the pump may be regulated whereby selected numbersof cylinders may be selectively supplied with "fuel for firing so that in--idling,- or low powenthe fire occurs less often' .with a. consequent: saving; in wear-on the engine parts and pump;parts.- 1

banks of cylinders are readily controlled, such as controlling the functioning or non-functioning of such banks by a throttle, and where the timing of the injection may be changed by the throttle.

Another object of the invention is to provide a fuel injection system'wherein the extent of the 1- output 'of individual'cylinders in each bank may be readily controlled independentlyof the other bank'and where the total output of one bank of cylindersmaybe varied nom the output of the other.

trolling cam or by means which advances o r-"retardslthe position of the shaft in a rotary direction. 1

Another object of the invention'is' to provide a fuelinjection system for an internal combus- 1 tion engine or the like wherein there'is'provided inixturerati'oadjusting means which is controlled by temperature variations of the engine such as the temperature of the lubricating oil of the engine or the engine temperature.

Ano'ther object of the invention is to provide a jfuel injection system utilizing a balanced diar'elieved. 7

Another object of the invention is to provide a phragm so shaped that stress concentrations are fuel injection system for internal combustion engines or' the like utilizing control cam means wherein wear on the cam cannot change the relative output from respective cylinders and wherein there is substantially no side thrust on 'thecam shaft.

Another object of the invention is to provide a pump such as a pump for pumping fluids'which is'not limited to any known field but isadapted for use in a wide range of fields, such as that 'of air conditioning, fuel injecting, handling of slurryrorthe like, and wherein the same pumping unit is adapted to handle different types of fluids without multiplying the parts thereof. 4 Another object of the invention is to provide a pumping unit wherein one pumping element can be readily removed without affecting the others andiwherein the pumping elements are replaceable without the necessity of recalibrating the entire unit."

Another object of the invention is to provide a pump. construction wherein no calibration is necessary. 1 v Y .Another object ofthe invention is to provide a, fuel injecting system for an internal combustionengine whereinbanks of cylinders of the en-- ginei may be used to fire alternately so that the cylinder'wear is distributed.

Another object of the invention is to provide a pumping device for an internal combustion engineer the like wherein the drive for the pumping element can be the same as the'ignition drive but the timing of the unit and that of the ignition can be adjusted independently, one with respect to the other.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, -drawings and claims appended hereto.

In the drawings which illustrate embodiments of the device and wherein like reference characters are used to designate like parts Figure 1 is a sectional elevation through one form of fuel-pump embodying the invention;

Figure 2'is a fragmentary sectional plan view takensubstantially' in the plane as indicated by the line 2-2 of Figure 1;

Figure 3 is a fragmentary sectional plan view taken substantially in the plane as indicated by the line 33 of Figure 1; l

Figure 4 is a-diagram showing the injection of fuel into successive engine cylinders and the successive'firing ofsaid cylinders controlled by the position oflthe pump cam of the pump illustrated in Figure 1; s

Figure 5 is a sectional elevation of a modified form of fuel pump embodying the invention; and

Figure 6 is a sectional plan view'takensubstantially in the plane as indicated-by the" line 6- 6 of Figure 5. 1

Referring first of all, more-particularly, to the pump illustrated in Figures 1 to 3 inclusive, the pump comprises a body portion In, and as-the pump illustrated is for supplying fuel to-"a six cylinder internal combustion engine, the pump body may conveniently be of hexago'nal form.

The body "I I) is provided with the bore l2 closed by the top and bottom end closures I4 and I6 forming a cam shaft recess. The body portion Ill is provided with the pedestal l8 to which the control lever 20 is pivoted as at 22. The control lever comprises the arm 24 connected to suitable operating means (not shown) and the opposite arm 26 of said lever is loosely pivoted as at 28 to the cam shaft 30, whereby oscillation ofthe lever'2U raises and lowers the cam shaft 30 in a controlled manner. The cam shaft passes through a bearing portion 32 in' the upper end closure l4, and within the bore 12 the shaft is provided with the cam portion 34. In the embodiment shown, the cam shaft is adapted to make one revolution for each seven revolutions of the crank shaft of the engine to which the pump supplies fuel, the engine being two-stroke cycled, hereinafter called two cycle.

The cam is provided with seven stages, for the purpose to be later described, said stages being indicated at 36, 38, 40, 42,44, 46 and 48. The top stage 36 is provided with seven

lobes

50, 52, 54, 56, 58, 60 and 62 (Figure 2), and successive stages 38, 40, etc., are provided with one less lobe. For example, stage 38 is provided only with'lobes 50, 52, 62, 6D, 56 and 56; stage 40 as illustrated in Figure 3 is provided with

lobes

50, 52, 54,62, 58 and 56; stage 42 is provided with

lobes

50, 52, 60, 58 and 56; stage 44 is provided with lobes 56, '52, 60 and 56; stage 46 is provided with lobes 50, 52 and 56, and stage 48 isprovided with lobes 50 and 52.

Cam portion 34 abuts against a springseat 64 for one end of the spring 66, the lower end of said spring seating on spring seat 68 of the lower end enclosure. A portion of the cam shaft 30 extends through the bearing portion l0 of the closure [6 and is provided with a helical or spiral spline 12,

housings.

cureda-by the pump housing end- II6. "course, understoodthat-while the fiat diaphragm II-.2 is illustrated, any-other :form. of pulsating pressure.

:zgpomm which; engages with complementary -'spline;means provided on :the drivel'shaft coupling p14, said coupling being rotated by a suitable drive shaft, not ;shown,' driven by the "engine, Such"; as the ignition-ortiming; shaft. .iTheDhousing I0 is suitably supported :as at '16 with respect to the engine; through a support 18.

Adjustable means 80'is provided for initially adjusting the timing ofzi the cam shaft, and said :means may conveniently take the form :of alug I .02: provided withsa suitable slot through which .thehousing I 0%may befixed by means of the bolt 04. This; then, relatively, positions the splines, one'with-respect tovthe other.

The body is provided with equallyspacedzhy- :draulic pump housingstt; which, inthesembodiment shown, are six in number. As'-.each--,-of the housings and their connections are similar, it will only be necessary to. describeone of such The housings 66 :arepreferably corplanar,

' being: located about mid-way of the depth 0f" the "hose I2, and each housing 86-is secured asby threads 88 to'the' housing I 0 and is provided-with the enlarged bore 90. A plunger or: follower 32 extends through passageil l provided in'the'hous- 'ing I0'andis provided atits inner-end 96 with a spring seat 96 for the spring 1 I00, the opposite endof the springseating on seat I02-of saidbore.

The outer or opposite'end l-Mof'said plunger is.

the cam engaging end, and in the embodiment shown-is of the mushroom type, though itmay be-understood, of course, that any-type maybe used.

Housing 06,; provided with-a bleed ventyplug -I 06 to .bore fill is providedwith the smaller bore I08 which communicates .at' one end-with boretil and at the other" end with ;the diaphragm recess -I I0. Asuitable diaphragm- I I2--is secured in position by-meansof the collar-H4 which in turn is se- It is, of

member maybe used, such as a collapsible bellows orthe like, suchas illustrated in application Serial No. 541,969, which issuedas-Patent N'o. -.2-,559,364 on July 3, 1951. Diaphragmrlm is preferably made of a flexible, resilient material which .is chemica'lly inert to petroleum products 'or to'the product being pumped and the hydraulic fiuid,--such-as synthetic rubber; plastics as" Teflon (tetrafluoro ethyli-ne) ,methyl acrylate,

or metals as 18-8 stainless -steelor Hastellcy (a nickel, chromium, molybdenum, iron alloy) '0 and -B, and the diaphragm may-beysuch as shown and illustrated in anapplication filed of: even date herewith Serial .No. 64,076.

Check ,valve fitting I8 is secured a at I20 'tothe. housing '86,the spring pressed valve I22 seating onseat I24, spring I26 urging said valve toward closed position, one end-of the spring being seated on the valve and the other end of the springbeing seated on perforated fitting I26. A

--tube:such as anoil tube I30 is secured as at I32 to the-fitting H8, andis connected toany. suitable source of supply, preferably under slight The collar II-4 and closure H6 form anouter fuel chamber I34 with the diaphragm H2, and closure H6 is connected tothe fuel inlet check valve fitting I 36 provided-with the valve I38 seated towardthe flow of fuel, tha-tis; seated on seat I40,- fuel-supplyline I02 being connected tosaid'fi'tting I36 as at I46;

The valve is urged toward closed positioniby means .of the spring" I 46 seated on perforated fitting I48. Fuel supplied past the check valve I38, is suppliedto chamber. I34, by passages I50 and I 52,;;and:;passage I50 communicates with the outlet check valve fitting I I 54 1 provided with the check valve I56seatedtoward thepassage I50,

I being urged ftoward closed position onv seat ,,l 51

bygmeans of the spring Mil-seated onthe perforatedi'fitting 160. FittingsIZfl, I48 and I60 are adjustable whereby thetension of the respective springs which are seated thereon may be varied.

' Thefloutletsupply line' I62 is 'securedto the fitting; IEl-asrat I-64 and said line I62 is securedto a suitablenozzle forsupplying fuel to a-cylinder ofkansinternal combustion engine, such as shown in" application .Serial No. 617,752, filed September 21, ,1945101'; Spray Nozzle, now Patent-No. 2,555,803. I Each-of. the-separatev hydraulic. pumps are connectedina similar manner-to their respective cylinders;

In operation of this. form-01f thedeviceyletit be-passumed that the ,cam shaft 30,1is depressed smthat stage 36engages the followers 92.. In

this stagev the pumps will be successively operated, that is, eachfollower will be moved against its spring I00 by contact with the lobesv 50, etc., causing displacement of'liquid in the respective hydrauliopump housings 86, which in turn actuates'the respective diaphragms II2 whereby reciprocation of the diaphragms causesa pumping action ofthe fuel supplied to the'respectivecylinders.

If it is desired. to clecreasethe throttle, thecam shaft 30 israised -to:the selected stage. For example, let it be assumed that the. cam shaft is raised so that the followersjcontact coursegdil. .In'this case only one lobe is utilized.- Inasmuch as there are seven. lobes: and six cylinders, the actuation will be {as illustrated in Figurev 4.

Let'it-be. assumed-that engine cylinder numher I I. to'be-aifected is indicated by station I 6'5, successive

engine cylinders numbers

2, 3, 4, 5. and, 6 being shown atstations I6B,.I'I0, I72, I14 and H6. -Let :it-beassumed that the" fuel injection pumps for the respective cylinders'are also :at

166, "I68, etc., number one cylinder will fire-at I18 vandtheengine crank shaft will then rotate through 360, plus 60 and'cylinder number 2 will fire at I80. While thecrank shaft was going through-420, the cam shaft 30 rotated through 60. The crankshaft then. rotates through'another 420rwhereby cylinder. number; 3 fires at I82. Cylinder number 4 fires 420 later at I8 1.

LCylinders'numbers 5 and 6 fire 420 at 840, at I86. and I68, respectively,-and for each 420 of thecrank shaft the cam shaft rotates through .60.

Thus the cylinder'wear is distributedwhile idling-(minimum throttle).

It is understood that if six lobes were used on the cam shaft instead of seven, the cam shaft in the lowest idlingposition would run at the speed ofzthe crank shaft, that is at stage 48, only one'and the same cylinder would fire each time instead of successive cylinders, such as where seven lobes are used. Each cam lobe and each cam stage is so shaped that as the cam shaft is being moved downwardly to cause successive cylinders'to be brought into operation, the mixture to the opera'ting cylindersis first enriched up to the time that the followers change stages, at Which'time the lobes in the newly entered stage cause-the mixture to get leanerso thattheefiect of causing cylinders to become xop'erative is a gradual one, from onestage to the other, thus causing asmooth DOWBPfiOW. The shapeof the lobes in .the embodiment illustrated. is thus flared or tapered upwardly on each side of the center of the'lobe, such as shown at I88 (Figure 2).

Also, it will be noted that as the cam shaft 38 is raised or lowered the spline 12 causes a change of relative position between shaft 38 and the driving shaft of coupling 14, whereby the injection time is advanced or retarded, depending upon the shape of the spline and the stage engaged, and type of service to which the engine is put.

Referring now to the construction illustrated in Figure 5, the device comprises the housing I 82 provided with the connection I84 secured in a suitable support I86, the position of the'housing being adapted-to be adjusted as by adjusting means I88, which may conveniently take the form of the base plate I98, having a suitable slot through which the bolt I92 extends.

The housing is provided with the bore I94 closed by the top closure I96,. said closure being provided with the bearing I98 through which one end of the cam shaft 288 extends. A pedestal 282 is provided on the housing, and the lever 284 is pivoted thereto as at 286. The lever, as shown, is in the form of a bell crank provided with the arm 288 to which the operating means 2I8 is adjustably pivoted as at 2I2. The lever is provided with the arm 2I4 adapted to engage the outwardly projecting end of the cam shaft 288 for controlling the position of said shaft, the end of the shaft being shown as a button 2I6 resiliently mounted on spring 2I8 disposed in recess 228 of the cam shaft. The lower end of the shaft 288 extends through the bearing portion 222 of the housing and is provided with the tang 224 received in a suitable slot 226 in the drive shaft 228. A spring 238 is disposed to seat at one end on the spring seat 232 and at the other end on the antifriction bearing 234 for urging the cam shaft upwardly.

In the embodiment shown, the device is adapted to be operative to cause operation of certain selected cylinders and in this case the pumping elements are placed intwo banks or courses. For example, the pumps for cylinders I, 3 and 5 are in one course and the pumps for

cylinders

2, 4 and 6 are in another course. The pumping ele ments in each course are similar.

Referring first of all to the upper course, a gasoline-inlet manifold 236 is supplied from a suitable source, not shown, and is secured as at 238 to the housing I82. Said manifold communicates through passage 248 with the inlet valve 242 seated toward the manifold, being spring pressed as at 244 and provided with the spring adjusting and retaining means 246 apertured to permit passage of fuel therethrough. The valve communicates through passage 248 with the fuel diaphragm chamber 258, which in turn communicates through passage 252 with the outlet valve 254, the valve being adapted to be secured to suitable piping (not shown) for supplying the proper cylinder, as for example cylinder num-- ber I.

A check valve 256 is provided seating against the flow, being urged toward closed position by the spring 258 which in turn is retained by the apertured retaining and adjusting member 268. The diaphragm 282 is cupped shape, sealed and bonded to the ring 264 formed on the member 266. The inside of the diaphragm communicates through passage 288 with the bleed plug 218. The inside of the diaphragm also communicates through'passage 212 with the passage 214 which in turn communicates with passage 216, -a check valve 218 seating towardpassage 216 whereby oil contained in the bore I94 may be supplied past the check valve 218 which closes toward the bore I94 to the inside of the diaphragm 262. The valve 218 is spring pressed by spring 288, the spring being seated on the apertured retainer and adjusting members 282.

A plunger 284 is mounted in passage 286, which is aligned with

passage

2,12, and said plunger is provided with the roller follower 288 pivoted to the housing 298 provided on the plunger 284, the spring 292 urging the follower towardthe cam lobe 294. The cam lobe 294 is bevelled and shaped as illustrated in Figure 6 whereby the roller 288 always contacts the cam 294 over a line contact.- v

Cam lobe 296 is similar to cam lobe 294, and assumingthat the pump illustrated for the lower course is shown for cylinder number 4, the lobe is spaced from lobe 294.

/ Manifold 236 is secured as at 388 to the housing and communicates with spring pressed check valve 382 similar to check valve 242 closing toward manifold 236. The check valve communicates with fuel chamber 384 formed by threaded plug 386 retained by cap 388. The chamber 384 communicates with passage 3I8 which communicates through check valve 3I2, similar to check valve 254, and suitable piping (not shown) with cylinder number 4, check valve 3I2 seating toward the chamber 384. The diaphragm 3I4, similar to diaphragm 262, is bonded to collar 3I6 which is part of member 3I8, and the inside of the diaphragm communicates through passage 328 with the check valve 322 which in turn communicates with the bore I94, check valve 322 being provided with the ball 324 which seats toward the bore I94, being spring pressed by spring 328, the spring being retained by the apertured adjusting and retainer member 328. The inside of the diaphragm also communicates through passages 338 and 332 with bleed vent plug 334. The plunger 336 is spring pressed by spring 338 and reciprocates in passage 348, aligned with passage 328, the spring urging the housing member 342 toward the cam 296, the housing being provided with the bevelled follower roller 344.

Below the cam 296 there is provided 'a cam lobe 346 which is operative when

cam lobes

294 and 296 are in inoperative raised position whereby only the lower banks of cylinders are supplied with fuel. Operation of the lever 284 causes vertical movement of the cam shaft 288 to dispose the cam surfaces 294 and 296 in operative relation with the followers, as illustrated in Figure 5, or the cam shaft may be moved to a position where follower 288 is inoperative, as where it contacts the cylindrical portion 348 of shaft 288, and follower 332 is operative by the cam 346.

When the follower 344 is operative by the cam 346, and it is desired to cause operativeness of the other bank of cylinders, the lower banks of cylinders are first enriched by cam 346 due to the shape of said cam, and as the cam shaft 288 is depressed the roller follower 344 will travel down the slope 358 so that when the upper bank of cylinders become effective with the lower banks of cylinders, that is, when the rollers 344 and 288 engage cams 298 and 294, respectively, the six cylinders will be lean so that a gradual flow of powder will result. Operation of the followers, of course, causes oscillation of the diaphragms, causing a pumping action from the manifold 236 to the outlet fittings and thus to .illustration and not limitation as various and other forms of the device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

1. In a pump, the combination of a housing having a lubricant containing cam shaft recess therein, a cam shaft disposed in said recess and having an end projecting from each end of said housing, means connected to one end of said shaft for bodily moving said shaft, means operatively connected to the other end of said shaft for rotating said shaft, a plurality of courses of cams on said shaft within said recess, said cams comprising cam lobes, the number of cam lobes in each course being different from the number of lobes in the other courses, and a plurality of pumping elements disposed in said housing radially of the axis of said shaft, each of said pumping elements having a plunger adapted to be selectively reciprocated by the cams of the respective courses.

2. In a pump, the combination of a cam shaft, means for rotating said shaft, a plurality of courses of cams on said shaft, a plurality of pumping elements, means for operating said pumping elements including a reciprocable cam follower for each of said elements, and means for effecting an engagement of said followers and a selected course of cams, whereby the cams in the other courses are inoperative to actuate said pumping elements.

3. In a pump, the combination of a cam shaft, means for rotating said shaft, a plurality of courses of cams on said shaft having faces inclined longitudinally with respect tothe axis of rotation of said shaft, a plurality of pumping elements, means for operating said pumping elements including a reciprocable cam follower for each of said elements, and means for effecting an engagement of said followers and a selected course of cams, whereby the cams in the other courses are inoperative to actuate said pumping elements.

4. In a pump, the combination of a cam shaft, means for rotating said shaft, aplurality of courses of cams on said shaft, a plurality of pumping elements, means for operating said pumping elements including a reciprocable cam follower for each of said pumping elements, and

means for effecting an engagement of said followers and selected courses of cams, whereby the cams in the other courses are inoperative to actuate said pumping elements.

5. In a pump, the combination of a cam shaft, means for rotating said shaft, a plurality of courses of cams on said shaft, said cams comprising cam lobes, the number of cam lobes in each course being different from the number of lobes in the other courses, a plurality of pumping elements disposed radially of the axis of said shaft, means for operating said pumping elements including a reciprocable follower for each of said elements, and means for bodily moving prising 6am dupes,- he

each 'cou'rs'e bein'g'dift s. weather sour, inclined-longitudinally th respect to the axis of said shaft, a pluralityof pumping elements disposed radially ortrie axisofsaidshaft, means forT 'operating said pumping' elem'ents includi a reciprocable cam follower mr eacnpr saidt pumping elements, said followers being adapted. for movement in a plane at right angles to the axis of said shaft, and means for moving said shaft axially to selectively engage said followers with a course of said cams.

'7. In a pump, the combination of a cam shaft, rotating means for said shaft, a plurality of courses of cams on said shaft, a plurality of pumping elements, means for operating said pumping elements including reciprocable cam followers disposed radially of the axis of said shaft, and means for moving said shaft axially for effecting an engagement of said followers and a selected course of cams, whereby the cams in the other courses are inoperative to actuate said pumping elements and to alter the relative position of said shaft with respect to said rotating means.

8. In a pump, the combination of a cam shaft, means for rotating said shaft, a plurality of courses of 'cams on said shaft, a plurality of courses of pumping elements disposed radially of the axis of said shaft, means for operatingsaid pumping elements including a reciprocable cam follower for each of said pumping elements, and means for. selectively engaging one or more courses of cams with one or more courses of followers.

9. In a pump, the combination of a housing having a lubricant containing cam shaft recess therein, a cam shaft disposed in said recess and having an end projecting from each end of said housing, means connected to one end of .said shaft for axially moving said shaft, means operatively connected to the other end of said shaft for rotating said shaft, a plurality of courses of cams on said shaft within said housing, a plurality of pumping elements disposed in said; housing radially of the axis of said shaft in a plurality of planes, and means for operating said pump elements including a reciprocable cam follower for each of said pumping elements adapted to be selectively engaged and disengaged by the courses of cams.

10. In a pump, the combination of a cam shaft, means for rotating said shaft, a plurality of courses of cams on said shaft having faces inclined longitudinally with respect to the axis of rotation of said shaft, a plurality of pumping elements, means for operating said pumping elements including a reciprocable cam follower for each of said pumping elements adapted for movement in a plane at right angles to the axis of said shaft, and means for effecting an engagement of said followers and a selected course of cams, whereby the cams in the other courses are inoperative to actuate said pumping units.

11. In a pump, the combination of a cam shaft,

means adjustably connected to said shaft for rotating the same, a plurality of courses of cams on said shaft, a plurality of pumping elements, means for operating said pumping elements in- 11 eluding a, reciprocable cam follower for each of said pumping elements, and means for bodily, moving said shaft for efieeting an engagement or-Tsaid followers anqa selected course of cams whereby the cams on the other courses are inop erative to actuate 'sa-id pumping elements and to alter the relative position of said shaft with respect to said rotating means.

" WILLIAM H. MASHIN'I'ER.

REFERENCES CITED Number 12 UNITED STATES PATENTS Name te Mahler Dec. 3, 1929 Muller Jan. 24, 1933 Woolson May 9, 1933 Rassbach et al. July 17, 1934 Johnson Sept. 25, 1934 Godiriaux June 29, 1948