US2693768A - Dual purpose pump - Google Patents

Description

E. E. WETTLEY DUAL PURPOSE PUMP Nov. 9, 1954 3 Sheets-Sheet 1 Filed June 8, 1949 INVENTOR. mew/lard F wezi'l ciz N v- 9, 1954 E. E. WETTLEY DUAL PURPOSE PUMP 3 Sheets-Sheet 2 Filed June 8, 1949 INVENTORJ mew/Lard Z. We

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NOV. 9, 1954 WETTLEY 2,693,768

DUAL PURPOSE PUMP Filed June 8, 1949 3 Sheets-Sheet 3 United States Patent DUAL PURPOSE PUMP Eberhard E. Wettley, Chicago, 111.

Application June 8, 1949, Serial No. 97,744

30 Claims. (Cl. 103-207) This invention relates to a manually operable dual purpose pump for high pressure fluid delivery to a fluid operated mechanism and a pump that more specifically includes a second operative stage wherein the same pump functions to deliver a considerably larger fluid volume output to such fluid operated mechanism under low pressure demand conditions.

Numerous so called two-speed pumps have been developed to cope with this problem, but all are either too complicated and costly, or they have proven inefficient and impractical under actual operating conditions. The general trend has been to resort to dual cylinder structures having a double piston arrangement, but the difficulty in these designs has been to provide simple hand operated means therefor with suflicient mechanical advantage to be actually used with equal facility and ease to operate both stages of the dual cylinder or other twospeed pumps undernormal high pressure fluid demand conditions. The high pressure stages of such pumps are so limited under hand manipulation that power driven equipment has been resorted to to actually serve the purpose, and such equipment is of the type that is pressure responsive to the demand and not the kind which would b? suitable for manual work under the same conditions 0 use.

It is one of the main objects of this invention to provide a pump that is manually operable wherever needed to deliver fluid under high pressures to satisfactorily operate hydraulic or other fluid responsive equipment in their designed capacities and which pump is selectively automatically adapted to operate in a low pressure capacity to move relatively large volumes of fluid under low pressure conditions.

Fluid or hydraulic equipment mechanisms usually require lost motion operation before becoming effective to render service under high pressures. The result is that the hydraulic pump or pumps in any of these systems must operate at slow and time consuming intervals to move the members of each system into positions wherein their actual functions and purposes are ultimately rendered useful. By using a hand actuated pump designed for high pressure delivery in such systems the operator must spend much time and effort to move the parts acted upon by the pump through the fluid operable means until such parts become effective. And for all intents and purposes the high pressure design of such a pump is rather worthless as far as the low pressure manipulation thereof is concerned during the lost motion cycle period of the connected hydraulic or fluid equipment.

Another object of this invention, therefore, is to provide a manually operable pump that will actually serve in optimum capacity to move fluid under high pressure conditions and which will have the facility to throw off, so to speak, its normal high pressure function to effectively assume a rapid low pressure large fluid volume displacement cycle to quickly bring the coacting parts of a fluid system into operative positions for subsequent and further action under a high pressure fluid delivery cycle.

It is a further object of the present design to provide a single cylinder pump having the dual purposes above related thus concurrently simplifying the structure for fabrication and at relatively low cost production values.

A further object of the pump is to perform the dual purpose functions thereof through reciprocatory and rotative piston actuating mechanism, both actions being accomplished by the use of hand operable means which manipulate the piston within the confines of the single 2,693,768 Patented Nov. 9, 1954 cylinder structure. More specifically, the reciprocatory piston action produces the large fluid volume displacement at low pressures while the rotative action of the piston produces the lower volume and high pressure fluid displacement.

Other objects and advantages relating to the design of the dual purpose pump of the present invention shall hereinafter appear in the following detailed description thereof having reference to the accompanying drawings forming a part of this specification.

In the drawings:

Fig. l is a front elevational view of the pump as the same would appear in one typical installation thereof to operate a fluid cylinder of a machinery hauling semi trailer supporting foot;

Fig. 2 is a side elevational view of the pump structure as mounted upon the trailer with the latter in section substantially as viewed along the line 22 in Fig. 1;

Fig. 3 is a vertical axial cross sectional view through the pump proper and the connected valves with the piston retracted to the top of its stroke within the cylinder;

Fig. 4 is a similar cross sectional view of a fragmentary part of the pump illustrating the displacement feature of the piston when rotated to produce high pressure fluid displacement;

Figs. 5 and 6 are vertical cross sectional views take transversely of the pump axis and as seen along the lines 5--5 and 6-6 respectively in Fig. 3 and looking in the direction of the arrows;

Fig. 7 is a fragmentary detail view partially in section to show the piston rod structure and its connection with the hand lever and piston of the pump;

Fig. 8 is a plan view of the piston actuating cam as viewed from the cylinder nesting end thereof, such cam being constructed as a stamping and providing a separable pump part;

Fig. 9 is a cross sectional view of the stamped metal cam as viewed along the line 99 in Fig. 8;

Fig. 10 shows a modified cylinder construction wherein the cam for the piston comprises an integral part of the. cylinder head or cap;

Fig. 11 illustrates a solid cylinder with the cam cast or formed integrally into the end thereof to permit the use of the cylinder per se as a screw cap separable from its supporting base;

Fig. 12 is a fragmentary axial sectional view of a modified cylinder structure having a multipoint piston actuating cam which is designed to operate a coacting cam piston under rotary actuation in either direction of rotation;

Fig. 13 is a cross sectional view of the cam end of the iyz linde' in Fig. 12 as seen along the line 13-13 in Fig.

Fig. 14 is another modified pump structure illustrating a contemplated variation in the manual operable lever and pump operating mechanism which is readily applicable to any of the other pump designs herein described and illustrated.

The pump shall be described as a hydraulic unit and obviously may be installed and operated for use in connection with any kind of a fluid system or fluid operated apparatus requiring a pump of this dual purpose character.

Figs. 1 and 2 depict a more specific installation of the pump 1 as applied for manual operable use in connection with a semi-trailer 2 having a hydraulically actuated supporting unit 3. The pump 1 comprising the device of the present invention has a cylinder 4 carried by a base 5 to secure one end of the cylinder in a conveniently usable position adjacent the apparatus served thereby, the cylinder 4 being closed at its other end by a head 6 as a screw cap adapted for assembly of the cylinder pump parts and to provide ready access to such parts and the interior of the cylinder when necessary.

Base 5 includes flat apertured flanges 7 for bolts 8 to secure the base firmly to a support such as the side channel 8a of the trailer 2. This base 5 as best shown in Figs. 1, 2 and 3 further contains the pump check valves with the inlet valve shown at 9 and the outlet valve shown at 10, both valves being of conventional typesbut preferably quick acting large volumetric capacity unitsv pressure operation.

to handle the maximum output of the pump without flow retardation and without placing added burden upon the operating mechanisms of the pump.

The fluid circuit is best shown in Figs. 2 and 3 with a fluid conduit 11 connecting a fluid reservoir 12 with the inlet valve 9 of the pump 1,while a fluid conduit 13 is connected with the outlet valve and leads to one or more hydraulic cylinders 14 through suitable connecting conduits 15. Fluid from valve 9 enters the cylinder cavity 16 through a bore 17 'and such fluid is discharged through a similar bore 18 to the outlet valve 10. In this manner the supporting foot '19 of the trailer 2 ma'y be moved a distance 20 to the ground by the ram 21 of the foot cylinder 14. The hydraulic su portin unit 3 may be fixed to the trailer 2 or swingably mounted thereon as indicated by the connecting 'trunnions 22 to retract this gear when not in use. Suitable lockfmeans is usually employed to hold the gear retracted or in vertical trailer raising or supporting position. Since this structure forms no part of this invention such lock means are not shown and in her description is not deemed necessary, which also applies to the remainder of the fluid circuit operative to bypass the pump '1 and to provide means to lower the "trailer by fluid outlet from cylinders 14 and back to the reservoir. V

Fluid is moved through the cylinder 4 by means of a fpis'to'n 23 secured 'to a piston rod 24 that rides in an opening 25 in the screw cap head 6 of the pump. The

piston ,23 may employ the usual cup seal 26 and one or more fluid rings 27 to prevent fluid bypass or leakage "tothe rear of the piston. The rear of the body of the piston 23 terminates in a pair of contiguous radially disposed cams 28 and 29 of predetermined pitch and helical in nature 'to formbilateral screw means for high Such cams 28 and 29 are best shown in Figs. 3, 4, and 6, and these cams coact with another pairof complementary contiguousradiall'y dis- -posed 'ca'ms3l) and 31 formedfupon a suitable stamping 32 terminating in a peripheral flange 33 that is sandwiched between the outer end 34 of the cylinder 4 and the inner face 35 of the screw head 6. The cam stamping 32 is thus fixed to the cylinder 4 and has an aperture 36 which permits the piston rod 24 to pass 'therethrough to actuate the piston 23.

It should also be noted that the high points of each of the pairs of 'coacting cams "are preferably beveled as shown at 37 on the piston camsfa'nd at 38 on the'cylinder 'cams. These coa'cting bevels 37-37 and 3838 will cause a momentary pressure drop and fluid reversal in "the'cylinde'r immediately prior to the drop'oifsteps 39 on "the piston cams and '40 on thecylinde'r earns, the 'coac'tin'g cams being well shown in Fig. 4 as positioned upon the receding bevels'of the cams prior to the seating or nesting of the cams under a spring action mechanism to be -dea scribed, the separation of the cams having been induced by relative rotation of the piston with respect to the fined cylinder earn. V

I The spring faction mechanism for holding the cam sets 28*29 a d 30-41 in cooperative contact is best described with reference to Figs 1-, 2, 3 and 7. In Fig. '7 the 'pist'o'n'rod 24 'isshown with a squared end 41 seated in a square opening 42 in the piston 23 with the shoulders =43 on the round portion "of the piston red '23 abutting the 'face'of the piston adjacent thesq'u'are opening therein. The squared rod end 41 may be held socketed in piston 23 by suitable fastening means such as a 'nut '44 threaded upon the reduced stud 45 of the rod 24, and the other parts of the piston including the cup seal 26 are also se- ='cu'red "tothe piston by the same fastening means. :mampurpos'e of this structure is to unify theipiston and the 'rod whereby these elements maybe considered integra l for all intents and .purposes to thus insure that the piston mov'em'ent's strictly follow the rod movement's.

The other end "of the piston rod 24 is -squared at 46 and rides in a square opening 47 in a block"48 that has aligned studs 49 and 50 positioned to pass through "slots '51 and 52 respectively formed in opposite legs 53 and 54 of a composite lever 55 shown Figs. 1 and 2.

Washers E6 and cotter pins 57 are -car'rie'd by the studs 49 and '50 to 'ree'nfor'ce this structure-at this poin't although the opposite stud faces "of block 48 'agains't'theadjacent 'legfaces will normally revent=cpcking of "the block and studs within the lever opening 58 formed by th'e ofiset's 59 and 60 m : legs 53 and 54 of the -lever 55.

A head 61 is secured to the end of the-rod 24 a'nda The spring 62 is confined between said head and the block 48. Spring 62 normally urges the rod 24 to the left as viewed in Fig. 7, thereby holding the shoulders 63 of the round portion of rod 24 in'abutting contact with the adjacent face of the block 48. Spring 62 may be of such selected strength to normally hold the parts in the relationship illustrated with the functional capacity to permit movement of rod 24 relative to the block 48 and lever 55 under one set of conditions of operation of the piston and pump.

Lever 55 is composite as noted by using symmetrical halves of formed metal bars 'contn'arising the legs 53 and 54. Legs 53 and 54 are secu-red together by rivets 64 above block 4 8 and by at least one shouldered stud rivet 65 below the block todispose the lower .ends of legs 53 and 54 in spaced relation to each other to receive an arm 66 of a rotary bracket 67 therebetween. Both lower ends of the legs 53 and 54 of the lever 55 are pivotally mounted at 63 to arm 66 of the bracket67 thus providing the operational supporting means that positions :lever 55 in operative relation to the pump. The opposite :upper end of the lever 55 is angled at 69 to receive a rotational hand sleeve 7% thereon, and both the arm end 69 and sleeve 76 are positioned substantially horizontally or parallel to the pump axis when the pump parts are in the full line retracted positions indicated in Fig. 2.

.Referring to the rotary bracket =67 as best shown in Figs. 2, 3 and 5, arm '66 has an oifset 7-1 that terminates in a band bearing 72 which is :rotatively mounted upon the "cylindrical wall of thepump cylinder 4. This bracket band bearing 72 could be adjustably secured to the cylinde'r '4, out in the construction here used a sleeve 'or'col' lar 73 is fastened to the cylinder 4 by one or more set screws 74 and in a location wherein the band bearing 72 abuts the shouldered screw head 6, the latter and the collar thus forrninga peripheral channel within which the bracket 67 may be bodily rotated about the :longitudinal axis of the pump 1 under which conditions the lever 55 is also bodily rotated about the aligned axesof the pump 1 and block 48.

The operation of the pump involves two separate actions which may be defined as reciprocatory and "rotational, both, however, being solely confined to the cavity 16 of the single cylinder 4 and both utilizing the'single :piston 23 as the main fluid displacement means under the low and high pressure cycles "of the device. During the period requiring fluid displacement under low pressure conditions for taking up the lost motion of the fluid actuated mechanical parts acted upon by the pump 1, as in the case Where ram 21 in Fig. 2 must be advanced a distance 20 before becoming eflective in its designed capacity, the pump is then actuated as a reciprocatory pump. lever 55 is grasped by the :hand below the sleeve and beneath the angle portion 69 and is moved arcuately back and forth about the pivotal means 6-8 'as show-n in -Fig. 2 by the full line and broken line positions. With the use of a stud and slot structure for joining the block 48 and lever 55, a fixed pivotal means such as 68 is feasible. Also, spring 62 will actto return the rod 24 and piston 23 holding 'shoulders63 of the rod 24against the block 48, and on the power stroke the block 48 will automatically maintain its abutting relation to the rod shoulders=63 urging the piston the full length of "cylinder 4 moving the 'entire fluid slug out of valve 10 to :the hydraulic equipment. Cylinder l refills "completely-under the next retraction of the'pist'o'n by drawing fluid from the reservoir 12 through valve 9. I

After the foot 1 9 rea'ches the ground -the fluid demand pressure increases sharply and hand reciprocation of lever '55 is automatically halted. This stage is easily detected by 'th'e operator since the resistance of the piston and connected parts against the lever 55 will prevent -further forward manipulationth'ereof. When this occurs, the'pist'on earns 28 and 29 will be in cooperative-contact With-the fixed cylinder cams 30 and 3 1. The-'operator'may now shift his hand from the lever 55 to the hand sleeve 70 and swing the lever in a clockwise direction'through the are shown by the arrows in Fig. l, bodily rotating'piston '23 upon its axis within the cavity 16 ofthe cylinder -4 and about the long 'axis of the pump. With thedual cam arrangement, the piston 23 will be actuated 'f orwardly in the cylinder twice each complete revolution of the lever 55 and each'time by an amount equal to the maximum rise of the cams utilized. Spring "62 will re tract the piston quickly "at the completion'of each 'ca'rn -controlled forward stroke of the piston. Since the rotary action is rapid and the drop off of the cams rather instantaneous, the bevels 37---37 and 3838 provide a split second reversal in fluid pressure within the pump to give the check valves 9 and 10 an opportunity to open and close respectively for quick fluid intake through valve 9 with the simultaneous entrapment thereof by valve 10. Each next successive power stroke by revolution will force a relatively large amount of fluid out of the same bore of the cylinder for approximately one half of a turn of lever 55, part ofthe half revolution being absorbed by the bevels which operative stage actually belongs to the intake stroke of the pump. The high pressure cam action stroke is well shown in Figs. 3 and 4.

In passing from low pressure stage to the high pressure stage the lever functions initially as a lever and secondarily as a crank. The separable cams provide means to build up considerable power on the piston longitudinally of the cylinder. The mechanical advantage obtainable by a selected given lever length acting substantially closely to or coincident with the axis of rotation of the cams that'hug their axes of rotation is unlimited.

Suitable conventional venting means may be used to the rear of the piston 23 if necessary to prevent air lock or resistance. In the construction shown enough venting may be had through the opening 36 (see Figs. 8 and 9) through the stamping 32 here illustrated and through the bore 25 in the head 6. If further venting is needed, one or more vent holes 75 maybe made in the stamping 32 to bypass air through one or more vents 76 drilled through the head 6.

The spring mechanism described and indicated in general at 77 in Fig. 2 will permit lever 55, as a crank,

to be swung through its arc of operation without being subjected to the jiggling of the rod 24 and its piston 23. The experience of the operator will supplement the lost motion action at the connection of the piston rod to the lever. With a modified construction it is possible to lock the lever for use as a crank during the high pressure demand stage of the pump. Such a scheme is illustrated in Fig. 14 wherein arm 66 may have a segmental extension 78 with a suitable hole therein for alignment with a hole or holes 79 in the adjacent lever part or parts for the reception of a locking pin or the like. In addition, the band bearing 72 may have a second arm 80 positioned to ride between the lever legs that are here additionally offset upwardly at 81 to receive such arm therebetween. A pin 82 may be used .to lock lever 55 to the arm 80 by insertion through suitably arranged openings in said arm and lever.

With either of the dual means shown in Fig. 14, it is possible to stabilize the position of the lever relative to the pump when the lever acts in the capacity of a crank during the high pressure cycle of the pump. The other parts will function in the same manner as in the first described device.

Attention is directed to the mounting of lever 55 in the structures illustrated in Figs. 2 and 14. The lever is made to straddle the arm 66 of the rotative bracket 67 to guide the lever in a plane radially disposed with respect to the pump axis to relieve the extending piston rod 24 of lateral stresses particularly when the lever is used as a crank. And whether arm 80 is used for locking purposes or not, the same does act in the capacity to further hold lever 55 in its operative plane with respect to the pump under either the reciprocatory or rotative stages of operation of the pump.

It should be noted that the reciprocation of the pump may be performed in any position of the 360 degrees about the pump axis. It may also be true that the piston and cylinder cams may not be lined up to nest fully when the pump is used as a reciprocation pump. But a rotational reversal of the lever in the opposite direction from the normal cam stroke rotation will align the cams so that manipulation of the handle or lever will give the piston its full stroke operation within the cylinder. Movement of the lever in the normal operative crank actuation direction can also be used to line up the cams to nest by listening to the snap of the cams into nested position. Continuing with the swing-- ing of the handle or lever to reciprocate the piston will thereafter also yield a full stroke of fluid. Generally, whether the cams are fully nested or not is not objectlonable particularly when considering the large capacity of the pump under the low pressure cycle In the forms described the crank or high pressure cam stage is only performable under unidirectional op eration of the lever 55 due to the shape of the cams used. Figs. 12 and 13 show a pump of the same character using multipoint coacting cams 83 and 84 connected with the cylinder 85 and piston 86 respectively. These cams are each designed with two high, points 87-87 and two low points 88-88 with the continguous joining cam surfaces rising and falling in each degrees of the 360 degrees of cam surface. This elimi nates the vertical drop off and obviously lengthens the time of the intake cycle. Furthermore, this provides symmetrical cams which allow axial rotation of the piston 86 in either direction by lever 55 to carry on the high pressure stage operation of the pump in the same manner as the first described pump.

Figs. 10 and 11 have been inserted to show the varia tions possible in providing the cylinder cam arrangement. In Fig. 3, the cylinder cam comprises the stamping 32 portrayed in Figs. 8 and 9 constituting a separable member securable into the cylinder by the joining screw head 6. Fig. 10 shows the cam 89 as cast or formed integrally with the head 90 to be screwed into place upon the cylinder 91. Fig. 11 shows a cam 92 cast or formed as an integral part of the cylinder 93 having a threaded end 94 for screw attachment at 95 with a threaded end 96 of a suitable base 97 which is provided with inlet and outlet ducts 98 and 99 as in the first described base 5. In the Fig. 12 structure, the head is integral with cylinder 85' and cam 83 forms an integral part of the same to provide a design using the same principle or" construction as indicatedin the Fig. 11 version of the pump.

There are other changes and variations possible and contemplated in the dual purpose pump structures disclosed and described herein Without departing from the fundamental concept of this invention. All such modifications and structural deviations shall, however, be governed by the breadth and scope of the language of the appended claims that are directed to the pump of this invention.

What I claim is:

1. In a pump, the combination of a cylinder, a piston therein, reciprocable means to bodily actuate said piston endwise within said cylinder, and a second means to independently actuate said piston within said cylinder comprising radially disposed cooperative means carried by opposed ends of said cylinder and said piston respectively, said cooperative means being rendered operatively responsive under relative rotation between said piston and said cylinder.

2. In a pump, the combination of a cylinder, a piston therein, shiftable mechanism carried by said cylinder and connected with said piston to bodily actuate the latter longitudinally in said cylinder, and a second mechanism to independently actuate said piston longitudinally in said cylinder comprising radially disposed coacting means carried by opposed ends of said cylinder and said piston respectively.

3. In a pump, the combination of a cylinder, a piston therein, reciprocable mechanism carried by said cylinder and connected with said piston to actuate the latter longitudinally in said cylinder, and a second mechanism to also actuate said piston longitudinally in said cylinder comprising radially disposed coacting means carried by opposed ends of said, cylinder and said piston respectively, said coacting means being operably responsive under relative rotation between said piston and said cylinder, and one of the aforesaid mechanisms comprising operative means for inducing said relative rotation between said piston and said cylinder.

4. In a pump, the combination of a cylinder member and a piston member therein, said members being arranged for relatively longitudinal movement along their common axis and for relatively rotatable movement about said same common axis, operative means connected with one of said members to relatively actuate said members along said common axis, and further radially disposed operative means connected with opposed ends of both of said members to relatively actuate said members rotatively about their common axis and to also simultaneously actuate said members relatively to each other along the aforesaid common axis.

5. A pump comprising a cylinder, a piston disposed within said cylinder for reciprocatory and/or rotational racemes movement :relative ;.to :said -.oy1inde.r,;and radiallyflisposed coacting cooperative means carried .by gopposed ends of :saidcylinder and'said piston to actuate JSEtidiPlSIOIl longitudinally of said cylinder during relative rotation :between said cylinder and piston, andoperative means con- .nected with said :piston to reciprocate the same within said cylinder independently of said cooperative means or to selectively induce relative rotation between said cylinder and said piston to simultaneously actuate :the latter through said cooperative means.

'6. A pump comprising a cylinder unit,-a,piston :unit disposed withingsaid cylinder unit for reciprocatory and/ or rotational movement relative tovsaid :cylinder unit, .and r-radially disposed coacting cooperative means carriedby opposed-ends of said-cylinder unit andsaid piston {unit to actuate said piston unit longitudinally of said-cylinder unit during relative rotation between :said units, and .operative means connected with one sO'f the :aforesaid units to cause relative reciprocation between said units independently of said cooperativermeans or to selectively induce relative rotation between said units to thereby simultaneously actuate the units relatively and ,longitudinally with respect to each other through -.the aforesaid cooperative means.

7. A pump comprising a cylinder, a piston disposed 2 within said cylinder for reciprocatory and/ or rotational movement relative to said cylinder,,.radiallydisposed cooperative means carried by opposed endsof'said cylinder and said piston and arranged to actuatesaidpiston5longitudinally of said cylinder during relative rotation between said piston and cylinder, and a piston rod guided .by said cylinder and connected with said piston to reciprocate the latter independently 'of said cooperative means and adapted to selectively inducerelative-rotation between said piston and said cylinder to longitudinally actuate said piston in said cylinder through the instrumentality of said cooperative means.

8. A pump comprising a cylinder, :a piston disposed within said cylinder for reciprocatory and/or-rotational movement relative 'to said cylinder, cooperative :means carried by said cylinder and by said piston and arranged to actuate said piston longitudinally :of .said cylinder .duringlrelative rotation between saidrpiston andcylinder, a piston rod guided by said cylinder and-connected-with said piston to reciprocate the latter independently of said cooperative means and adapted .to selectivelyinduce relative rotation between said piston'and saidcylinder to longitudinally actuate said piston in said cylinder through the instrumentality ofsaid cooperativemeans,

a lever connected with said piston .-rod, and ,mounting v means to support said lever for swingable ,motion 'to .reciprocate said piston rod including a-pivotal support for bodilyrotation of said lever torotatesaid piston-rod and to actuate'said piston by said cooperative means.

'9. A pump comprising-a cylinder, a piston'therein a piston rod carried bysaid cylinder and connected 'to actuate said piston, a lever connectedwith said rod, a bracket to pivotally support said lever-to reciprocate said piston rod and the piston longitudinally .tosaid-cylinder, said bracket having pivotal connection with said'cylin- .der to bodily rotate said lever and the connected rod and piston about the axis of said cylinder, andcooperavtive means interposed between said cylinder and said piston to longitudinally actuate the piston within said cylinder upon relative rotation between'said piston and cylinder by said lever.

10. A pump comprising a cylinder, a piston therein, a piston rod carried by said cylinder and connected to actuate saidpiston, a lever connected with said rod, a bracket to pivotally support said lever to reciprocate said piston rod and the 'piston longitudinally to said cylinder, said bracket having pivotal connection with said cylinder to bodily. rotate said lever and the connected .rod and-piston about the axis of said cylinder, and cooperative means interposed between said cylinder and said piston to longitudinally actuate thepiston within said cylinder upon relative rotation between said piston and cylinder bysaid lever, said cooperative means comprising coacting cams carried by said piston and by said cylinder respectively.

11. A pump comprising a cylinder, apiston therein, .a piston rod carried by said cylinder and connected .to actuate said piston, a lever connected with saidrod, a bracket to pivotally support said lever to reciprocate, said ,piston .rod' and the .r piston longitudinally to ,said cylinder,

said :hracket i'havingepivotal connection :with said cylinder :to :hodily :rotate said lever and the connected :rod and piston about the axis of said cylinder, and cooperative means interposed between said cylinder and said piston rto glongitudinally actuate the piston within ,said cylinder ruponrelative rotation between said piston and cylinder :by said ,lever, said .cooperative ameans comprising coacting cams carried :rbyrsaid :piston;and :by said cylinder respec- .tively, said .cams veach having their effective coacting cam surface contours disposed operative :planes pozsitioned :generally sradially to the axis of said cylinder, and .said cams being .rendered :inedective during the reciprocation of said ,piston while being rendered fully eifective during the .relative .rotationof said :piston with %respect to said cylinder.

:L2. in a pump, in combination with a cylinder "and :a piston, a;lever connected ;to reciprocate said piston, a bracketcarried 'by: said cylinder for 'bodily rotation about Ithe axis :of the latter, pivotal means connecting :said lever with said-bracketstoipermit oscillationaofzsaid lever .in i-a direction Ito :reciprocate said piston, .and cooperative earn means connected with .a'fixed partiof said cylinder :and .with said movable piston respectively .and arranged Ito iactuate .said .piston longitudinally 'of said cylinder :during relative rotation 'between said piston :and .cylinder by said lever and :the rotatably mounted bracket.

113. xIna pump, in combination with a rcylinderanda .piston, a lever connected to reciprocate said piston, a :bracketicarried by said cylinderaforlbodily =T0t2lti0l'118b0llt the axis of :the -'latter, pivotal .means connecting said lever with said bracket to permit oscillation of said lever :in a direction ;to reciprocatersaid-piston, and coopera- .tive.:cam:means connected with'affixedpartuof said cylin- 'der and .with said .movable'zpiston respectively and ar- :ranged:to actuate said piston longitudinally of said cylinzder during relative rotation between said piston and :cylinderbysaidlever and'tlre rotatably mounted bracket, said cooperative =cam means :being :located :at one end :of said cylinder and :upon aniadjacent :face of said piston :respectively;for operative :coaction when said piston .is .brought to said one end of said cylinder by said lever, and :resilient means connected with .said :piston to urge said cam means into operative contact during bodily rotation :of said ;lever to thereby actuate .said piston through said cooperative cam ameans.

14. .In a :pump, :a cylinder, :a piston therein, :a :piston :rod connected with said piston and projecting fror n one :CIld of said cylinder, a bracket pivotallymounted upon said cylinder -.to revolve .about the axis 'of :the latter, a lever pivotally carried by said bracket .to yoscillatetin any plane coincident :with the axis 10f saidcylindenxoperative means 'for connectingsaid lever with isaidzp'iston ,rod to permit reciprocation of :Said :piston within .said ,cylinder bysaid lever, and coacting cams carried at zone .end of said cylinder and on an ,adjacent side :of .said piston and arranged to urge said .piston longitudinally .of said cylinder :by relative rotation of the piston with respect -to said ,cylinder, said jlever comprising means to movesaid cams into operative contact and to :actuate .the same by rotating ,said piston with ;respect ;to said cylinder.

,15. -.In a;pump, .a cylinder, a piston therein, ;a piston .:rod connected with said piston and projecting :from vone ,end :of ,said cylinder, a bracket pivotally mounted .upon said cylinder to revolve about the axis of "the .latter, a leverpivotally carried by said bracket to oscillate in any planecoincident with the axis of said cylinrder, operativemeans forconnecting said lever with said p1ston. rodto .permit reciprocation of said piston within said cylinder by said lever, and coacting cams carried atone end -'of said cylinder and on'an 'adjacent sidexof said piston and :arranged to urge "saidpiston longitudinally of said cylinder by relativerotation of the piston with respect to said cylinder, said lever comprisingmeans to move isaidcams into operative contact and to actuate thesame by rotatingsaid piston with respect to said .cylinder, and said .operative .means including resilient mechanism-to provide a lost motion connection between said lever andpiston rod to effectively join the latter .under directrreciprocation.of.said piston but'to permit relative movement between said lever and the piston ,rod :during rotation of the lever when said 'piston is actuated .by said coacting cams.

.16. .In a :pump, "a cylinder, a piston "therein, a rod for said pistonrprojectingxfrom said cylinder, abracket carried upon said cylinder to bodily swing about the axis of the latter, a lever pivotally carried by said bracket for operation in the axial direction of said cylinder, and operative means to connect the rod with said lever in line with said cylinder to permit reciprocation of the piston by said lever, said cylinder and the piston having cooperative cam means at the rod end of the pump arranged to actuate said piston longitudinally in one direction within said cylinder upon relative rotation between the piston and cylinder by said lever and the rod, and spring means connected with said operable means to normally urge said rod in the other direction to retract said piston after cam actuation in the aforesaid one direction.

17. In a pump, a cylinder, a piston therein, a rod for said piston projecting from said cylinder, a bracket carried upon said cylinder to bodily swing about the axis of the latter, a lever pivotally carried by said bracket for operation in the axial direction of said cylinder, and operative means to connect the rod with said lever in line with said cylinder to permit reciprocation of the piston by said lever, said cylinder and the piston having cooperative cam means at the rod end of the pump arranged to actuate said piston longitudinally in one direction within said cylinder upon relative rotation between the piston and cylinder by said lever and the rod, and spring means connected with said operable means to normally urge said rod in the other direction to retract said piston after cam actuation in the aforesaid one direction, said lever having a shank portion at its free end to provide a hand grasp to manually oscillate the lever for reciprocation of the piston, and said lever shank portion having a bent terminal end disposed generally parallel to the cylinder axis when the lever is retracted for cam actuation of the piston, said bent end forming a hand grip to conveniently rotate said lever and bracket about the axis of said cylinder.

18. In a pump, a crank constituting a bent lever, a bracket to pivotally support said lever, a cylinder, said bracket being mounted for rotation on said cylinder and about the axis thereof, a piston, a rod connected with said piston and with said lever on the axial line of said cylinder, said lever comprising means to reciprocate said piston between certain limits, operative cam means within said cylinder to actuate said piston between certain other limits upon rotation of said lever in a predetermined plane of operation, and cooperative locking means carried by said bracket and said lever respectively to position said bent lever in said operative plane for actuation of said operative cam means to move said piston by the rotation of said bent leverQ 19. A pump comprising a cylinder, a piston, a first means to reciprocate the piston, a second means to actuate said same piston within said cylinder comprising cooperative cams carried by the cylinder and the piston respectively and operable by relative rotation of the piston with respect to the cylinder, said cams each comprising high and low points disposed in the axial direction of the cylinder and adapted for alternate opposite engagement when rotated to urge the piston axially of said cylinder in one direction, and resilient means connected with said piston to urge said cams into nesting contact in the opposite direction within said cylinder.

20. In a pump, the combination of a cylinder having fluid inlet and outlet ports at one end thereof, a piston, actuating means to reciprocate said piston within said cylinder including coacting cams carried at the other end of said cylinder and by the piston respectively, said actuating means comprising a reciprocable member connected to move the piston through the full length of said cylinder, said member being rotatably mounted to induce relative movement between said piston and said cylinder whereby said cams are rendered operative to move said piston during the rotation of said member when the latter is held in retracted position at the cam end at said other end of the cylinder.

21. A pump comprising a cylinder, a piston, a first means to reciprocate the piston, a second means to actuate said same piston within said cylinder comprising cooperative cams carried by the cylinder and the piston respectively and operable by relative rotation of the piston with respect to the cylinder, said cams each comprising a plurality of inclined planes terminating in abrupt drop-offs disposed in the axial direction of the cylinder whereby said cooperative cams function to urge said piston axially of said cylinder in one direction, and resilient means connected with said piston to urge said cams together in the otherdirection within said cylinder.

22. A pump comprising a cylinder, a piston, a first means to reciprocate the piston, a second means to actu-z ate said same piston within said cylinder comprising cox operative cams carried by the cylinder and the piston respectively and operable by relative rotation of the piston with respect to the cylinder, said cams each comprising a plurality of inclined planes terminating in abrupt drop-offs disposed in the axial direction of the cylinder whereby said cooperative cams function to urge said piston axially of said cylinder in one direction, and resilient means connected with said piston to urge said cams together in the other direction within said cylinder, and said cams each having limited portions of said inclined planes beveled adjacent to said drop-offs to partially reverse the direction of said piston in said cylin-" der under the action of said resilient means immediately prior to the nesting of said said cams at the drop-oif po sitions of the cams.

23. A fluid pump comprising a cylinder, a piston, a rod to reciprocate said piston the full length of said cylinder, an oscillatory member connected to reciprocate said rod, mounting means to support said oscillatorymember in a given relation with respect to said cylinder and for bodily rotation about the axis of said cylinder. and coacting cams carried by said cylinder and by said piston respectively to actuate said piston through a portion of the cylinder length upon rotation of said piston. and said rod through the instrumentality of said oscillatory member.

24. A dual pressure fluid pump comprising a fluid cylinder having a given length, a piston therein to negotiate the length of said cylinder, an actuating rod secured to said piston to bodily reciprocate the same, and coacting cam means interposed between said cylinder and said piston to urge said piston lengthwise through a portion of said cylinder, said cam means comprising a first cam connected with said cylinder with the cam surface portion thereof arranged to face said piston and a second cam connected with the adjacent surface of said piston and having the cam surface portion thereof arranged to face said first cam, said piston being bodily actuated through the length of said cylinder by endwise movement of said rod, and said piston being partially actuated through said cylinder by said cam means upon rotation of the piston by said rod.

25. A dual purpose pump comprising a cylinder, a piston member therein, an unrestrained rotatable and freely endwise movable actuating member carried by said cylinder and connected with said piston member to motivate the latter, and coacting bodily separable cam means carried on one of said members and secured in fixed relation on said cylinder respectively. said piston member being endwise operable in said cylinder by rectilinear motion of said actuating member and also endwise operable in said cylinder by said cam means upon rotational motion of said actuating member when said separable cam means are adjacently positioned.

26. In a fluid pump, a cylinder, a reciprocable mechanism comprising a piston in said cylinder and a rod for said piston slidably carried by said cylinder and being adapted to bodily reciprocate said piston through out the length of said cylinder, and coacting cams carried at one end of said cylinder and upon an adjacent face of said piston respectively, said cams being rendered opera tive when said piston is positioned adjacent said cam end of said cylinder, and said rod comprising means to actuate said cams to move said piston along a portion of the length of said cylinder upon rotation of said piston by said rod.

27. In a fluid pump, a cylinder, a reciprocable mechanism comprising a piston in said cylinder and a rod for said piston slidably carried by said cylinder and being adapted to bodily reciprocate said piston throughout the length of said cylinder, and coacting cams carried at one end of said cylinder and upon an adjacent face of said piston respectively, said cams being rendered operative when said piston is positioned adjacent said cam end of said cylinder, said rod comprising means to actuate said cams to move said piston along a portion of the length of said cylinder upon rotation of said piston by said rod, and automatic biasing means connected with said reciprocable mechanism to normally urge that mechanism in a direction with respect to said cylinder so as to bring said cams into cooperative relation.

28. A dual pressure fluid pump comprising a casing, a plunger in said casing, a push rod for said plunger slidably carried in one wall of said casing and being adapted to bodily reciprocate said plunger throughout the length of said casing under certain fluid pressure conditions, and cam members associated with one end of said casing and with said plunger respectively, said casing cam member being arranged to surround said push rod and to face inwardly of said casing, and said plunger cam member being connected with said rod and arranged adjacent one face of said plunger surrounding said push rod and facing said casing cam member, said cam members being rendered coactively operative only when said plunger is positioned at the cam member end of the casing, and said push rod comprising means to actuate said plunger over a portion of the length of said casing during rotation of said plunger cam relative to said casing cam by rotation of said push rod with respect to said casing and under certain other fluid pressure conditions.

29. In a fluid pump, a cylinder, a piston carried in said cylinder and axially movable therein, a piston rod slidably mounted on said cylinder and connected with said piston for bodily reciprocating said piston within sad cylinder, a first cam constructed and arranged for fixed connection with said cylinder at a given position along the axis thereof, a second coacting cam constructed and arranged for connection with said piston and directly movable with said piston toward and away 12 from said firstcam, said rod comprising means to actuate said cams into operative contact within said cylinder, and said cams when in contact comprising rotatively operable means functioning to actuate said piston axially within said cylinder when :said piston is rotated with respect to said cylinder by means of said piston rod.

30. A iiuid pump comprising a cylinder, a piston in said cylinder, a relatively separable radially disposed cam members connected with said cylinder and piston respectively, rcciprocable means connected with said piston to actuate said piston within said cylinder and to cause alternate separation and meeting of said cam members, said reciprocable means being rotatable relative to said cylinder to operate said cam member when said members i are disposed in meeting contact by said reciprocable means whereby said piston is selectively cam actuated within said cylinder.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 630,977 Emgarth Aug. 15, 1899 721,023 Cosper Feb. 17, 1903 978,265 Barnett Dec. 13, 1910 1,613,147 Wahlstrom Jan. 4, 1927 1,718,985 Scoville July 2, 1929 1,739,195 Wheeler Dec. 10, 1929 2,010,679 Rosenberry et a1 Aug. 6, 1935 2,436,493 Shepard Feb. 24, 1948

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