US2563716A - Portable lubricant pressure pump - Google Patents

Description

Aug- 7, 1951 M. GARANCHER 2,563,716

PORTABLE LUBRICANT PRESSURE bPUMP Filed Dec. 20, 1947 2 Sheets-Sheet 1 Aug. 7, 1951 M, GARANCHER 2,563,716

PORTABLE LUBRICANT PRESSURE PUMP Filed DGO. 20, 1947 2 Shee'tS-Sheet 2 lmwm Patented Aug. 7, 1951 y 2,563,716 PORTABLE LUBRICANT PRESSURE PUMP Marcel Garancher, Chicago, Ill., assignor to Stewart-WarnerCorporation, Chicago, Ill., a corporation of Virginia Application December 20, 1947, Serial No. 792,911

18 Claims.

The present invention relates to dispensing apparatus, and more particularly to a manually portable power operated pump for dispensing fluids such as lubricant.

Aprimary object of the present invention is the provision of a new and improved high pressure pump for dispensing fluids such as lubricants which is power operated and manually portable.

Another object of the invention is the provision of a new and improved motor operated fluid dispensing pump in which simplified means are provided for controlling discharge of :duid when the motor is operating.

A further object of the invention is the provision of a new and improved power operated lubricant pump in which discharge of lubricant from the pump is controlled by co-operating valve means including a single valve manually operable to open communication between the discharge side of the pump and the reservoir of the pump and thus discontinue discharge to the parts to be lubricated, or to close the communication thus established for effecting discharge from the pump.

A still further object of the invention is the provision of a new and improved power operated pump for dispensing fluids which has a reciprocating pumping means and an improved driving connection between the pump and the power means of exceedingly compact construction.

Another object of the invention is the provision of a new and improved pump for dispensing fluids such as lubricant which has rotary power means and a reciprocating pumping means coaxially arranged with each other and with a driving connection between the two for convertingthe rotary action of the power means to reciprocatory motion.

Yet another object of the invention is the provision of a manually portable pump for dispensing fluids such as lubricant, which is of compact and generally improved construction and is simple and inexpensive to manufacture and assemble, so that its cost is low, but which nevertheless is durable and functions in a very satisfactory manner.

These and other objects, advantages and capabilities of the invention will become apparent from the following description wherein reference is had to the accompanying drawings, in which;

Fig. 1 is an axial section through the pump with the power means shown in elevation and a portion of the carrying handle shown; Fig. 2 is a sectional View taken on the line 2-2 of Fig. 1;

Fig. 3 is a developed view of the double helical cam slots or threads forming part of the driving connection between the power means and the pump plunger; and

Fig. 4 is a horizontal sectional View taken on the line 4-4 of Fig. 1, showing a planetary gearing forming part of the driving connection between the power means and the pump.

Referring to Fig. 1, it will be seen that the improved pumpof the present invention has a body casting I0 which is adapted to be supported upon a lubricant reservoir I2 and which supports the other elements of the pump. The vbody casting has internal threads I4 corresponding to the external threads on the top of the lubricant reservoir I 2 so that the pump may be readily engaged or disengaged from the reservoir. This reservoir may be specially constructed for the pump; or the body casting I0 may be so formed that it may be engaged upon conventional shipping containers for lubricant. The body casting I0 .has a depending extension I6 of a length to terminate adjacent the bottom of the reservoir when the pump is in operative position, and it is provided with an axially extending opening of stepped diameter for housing the operating mechanism of the pump.

The power means for driving the pump comprises a small high speed electric motor I8 of, for example, 1/12 horsepower, which has a base 20 that is engaged in an enlarged opening 22 in the top of the body casting. The base rests upon a ring gear 24 which is seated upon a shoulder 26 formed at the junction of opening 22 and a smaller opening 28 in the casting, and the base 20 is secured to the casting and the ring gear is locked against rotation by means of a series of bolts 3D, shown in Figs. 1 and 4, These bolts extend through the shoulder 26 in casting I0, ring gear 24, and base 20 and have nuts 32 threaded on the outer ends thereof into firm abutting engagement with the top side of the base. Annular gaskets 34 are preferably interposed between the ring gear and shoulder and the ring gear and casting to form a lubricant-tight union between these parts.

The motor I8 drives a pump through epicyclic or planetary reduction gearing, best seen in Fig. 4, and it has a shaft 36 which projectsaxially into the opening 22 and which is provided with gear teeth 38, as indicated in Figs. 1 and 4, spaced from its lower end so that this portion of the shaft forms the sun gear of the planetary gearing. This gearing also includes three 'freely rotatable planet gears 40 meshing with the teeth on the motor shaft 36 and engaged with the previously mentioned stationary ring gear 24 so that these gears will be rotated in a counterclockwise direction, as seen in Fig. 4. They will also revolve aroundI the axis of the shaft in a clockwise direction, thus rotating a driving member, indicated in its entirety in Fig. 1A by the number 42. This driving member is disposed in an opening 44 in the depending extension I6 of the body casting in axial alignment with the motor shaft 36, and the planet gears rotate upon'pins 46 fixed in a head 48 on the driving member. The'upper ends of the pins are interconnected by a ring 50 which has apertures spaced to correspond with the spacing of the pins, and the pins extend through these apertures so that the ring is carried between the head of thesepins andthe upa per end of the gears 40.

.The driving member 42 has a depending sleeve: like vextension consisting of a skirt 52 depending VVfrom'thehead of' the driving member, an'intermediate sleevelike member 54 and a sleevelike lower end member 56. The latter `two members aresecured tothe skirt 52 on the head of the driving member bymeans ofV an external. sleeve 58 having its opposite ends crimped over annular ribs on the lower end of the skirt 52 and the; upper end of the lower endJmember 56, as indicated at when the driving member is rotatedand cause with respect to each other when the direction of movement of the operating head is reversed is not impeded andthey will readily follow the thread The plunger '88 has a head 92' on its upper end .which seatsin a .recess in the lower end of the operating head and is secured thereto by a pin Sme/*extending` diametrically through the parts. The plunger extends through and is guided for vertical movement by-ineans of a guide member 96 housed in an opening 98 inthe lower end of the eXten'Sionf-,I 6. "Guidexnember VBiis held' in position by a plug I 00 threaded into aY bore [in "theV side wall of extension" I6. Thisplug has atip engaged in a. slot in the side wall ofthe guide` member 96.

Below the `Vguide member the plunger r88 extends through; a high; pressure` 'chamber I U2' which" vis formed in'p'art by; a1 'recess ic'lin the lowerend "ofjguide memberii; and in partby a cavity lIll6 Ellin'jEig. 1. These members are additionally securedtogether by an axially extending Vcrimp 62 in the periphery of the sleeve 58 engaged in alignedgrooves in the skirt on the head of the driving member and the intermediate and lower sleevelike members, as indicated in Fig. 2.

Driving member 42 is guided for rotation by co- .operating means includingv an extension 64 on the Vmotor shaft 36 .below the gear teeth thereon which projects 'into an aperture66 in 'the head 48 of j the'drivingjmember and a counterbore 68 in Athe depending extension |6 of the body castingwhich receives the lowerend ofthe lower` sleeve member '56A for rotation therein. A simple thrust bearing is provided ,between the driving membex` andthe gendjofthemotor rshaftV consisting of a ball I'Illinserted-in the aperture BIinithev head of thejdriv- "ing member. It will be'apparentr that'thisconnectionbetween thehead and shaftallowsA forro- .tationof theysh'aft anddriving member at different speeds. 'Rotarymovement of thefdrivingimember 42 j convertedv` to verticalreciprocatorymovement of anjoperating head assembly, indicated at-l2 in Fig. 1, by cooperating cam follower means v74 carjried in thevoperating-head whichV engage in right` japdjleft-hand thread or cam slots 'I6 formed in theinnerperipheral surface of the intermediate sleeve'memberjil of `thedriving member. The operating headY 'l2 is generally cylindrical and is "formed-in ariinsert '|08 threaded into the lower end of extension I 6. "A low pressure cylinder Ill) is Vformedinthis insert in communication with 'the' high pressure chamb'er'IDZ., andthe plunger .88 has a piston II2 threaded'- on :its lower end Whichjis adapted toreciprocate in Vthegcylinder I I0. f In Fig.; 1 the `plungerV 88` andV piston I |2-`are VCommunication betweenthe high pressure chamber I02 andthe pumpj cylinder II iscontrolled byv avalvev ||4 surrounding the lower end of plunger 88V and urged by?, spring II6 toward A its lower sidefwhichF engages -upona v'correspondadapted 'to be received in the opening defined Ywithin theidrivin'g member 42. A depending skirt -f I|l oni r the operating head slidably. engages in a bore. 80 in lthe depending extension I6 of thebody casting vandfguidesthe vertical movement of this the plunger` andA valve.

ing ridge formedonfthe -upper 'endfof the cylinder II 0. 'A-wa'sher |20. 'forming' a seat for the vvlower end of spring I I6 is engaged upon an annular shoulder formed in'the'upper edge of the cuplike Vmember. I-I8, and sealingy means |22includingia vleather *'packing -`washer and a` sealing ring 'of suitable material Yare Idisposed within the cuplike valve memberl to formA alfluidtight 'seal between -outlet port |24 Sfor the @high pressure chamber |02 is formed in the rwall of "guide memlber-*96. "-T'Ihis outlet -port is.A closed by aball lcheck Avalve |26 urged vIto closed` position'. 'by'. at spring I28 Iprojecting Jfrom '-av recess in .i a plug L |38 head2 .'Rotation'of the operating head isprevented by a plurality of splinesv in the-wall off bore B0. oneof which is shown at j82; in -Fig 1, .cooperating withj registering. slots in the skirt of V11ea'd"|2.

Atjits upperv endthejoperating head 'I2 has' a 7diametrically. extending cylindrical recess as indie' cated at -84.in'Eigs. `1 and 2 for receiving the two cam followers 14. l These followers have a peripheral. lipror tongue 86 thatis adapted to bev rethreaded into thel outer: endi cfa .bore I 32 formed vin *a lateral boss |34 on. the extension f1.6.

"Through a'Y drilledfpassage |:3'65'the bore. |32 .is in `comm'unicationwith.adischarge pipeior conduit |36 secured to the np'perXend-vofl the body casting =7I ll-bylafsuitablecouplingsleeve |40. SThe out-er 'endlofthis drilled-passage |361is vclosed '7' by l apluglI-EZ"threaded l therein. vA coupler |44 of conventionall construction Vfor connecting the pumpr to avil'pbricant receiving fitting onva`r part tobe lubricatedisfprovided on the outerend of .ceivedin the-opposite thread slots or `grooves 'IS intheintermed-iate sleeve 54.of ,the driving member. These projecting lips follow the slotsl 'the discharge condtfl 38;` Y

Discharge 'f-V lubricantfromthe'v high pressure chamber |02 occurs during the dOWILJSt'r'Qke` 'of the 'plunger 88 due to the fact that the plunger has portions of different volumetric displacement. It will be noted in Fig. 1, where the plungerl is shown at the top of its stroke, that the upper end of the plunger extending through the guide member 96 is approximately double the diameter of the lower end which entends through the high pressure chamber |82 and valve ||4 into the pump cylinder ||0. During the down stroke of the plunger nits enlarged upper end will be projected into the high pressure chamber |02 and will displace a quantity of lubricant from this chamber through outlet port |24 equal to the amount by which the volumetric displacement of this projected part exceeds the volumetric displacement of the smaller lower end which has moved out of the high pressure chamber.

A bypass for returning to the reservoir lubricant pumped by the piston is formed by a radial port |46 intermediate the ends of the pump cylinder which communicates with an annular passage |48 formed in the insert |08. This latter -passage is in communication with an inclined bore |50 in a lateral projection |52 on the lower end of extension |6 through an inclined passage |54. The need for accurate location of these passages is eliminated because the annular passage |48 will always establish communication between the radial port |46 and the inclined passage |54.

In accordance with one of the features of the present invention, control of flow of lubricant to the part to be lubricated is effected by controlling charging of the high pressure chamber |02 and this in turn is controlled by controlling iiow through the bypass means. This control is effected through a manually operated plunger Valve |56 engaged adjacent its lower end in the bore |50, and at its upper end in a bore extending through the top of the body casting 0. This plunger has `a sleeve |58 disposed thereon above a pin |60 extending diametrically through the plunger. A spring |62 engaged at opposite ends upon the pin |60 and the top side of projection |52 urges the plunger upwardly until the upper end of sleeve |58 engages the underside of body casting I0, as shown in Fig. 1. At this position of the valve the bypass passage is open to the reservoir so that lubricant pumped by the piston will flow through the bypass back to the reservoir and hence insufcient pressure will be developed to open valve 4 leading to high pressure chamber |02. As a result the high pressure chamber will not be charged and, therefore, no lubricant will be discharged to the part to be lubricated even though the motor is operating. If desired, a sealing ring |53 may be secured in an annular groove in that portion of the periphery of the plunger valve which reciprocates in the bore |50.

For convenience in handling the pump, a handle |64, shown fragmentarily in Fig. 1, is threaded into a boss |66 projecting from the body casting I0. Preferably the plunger valve |56 projects through the body casting adjacent the boss |66 so that the plunger can be operated by the thumb or one linger of the hand which holds the pump. A bail |68 may also be provided on the reservoir |2 for carrying the pump from place to place.

Lubricant may be fed tothe operating parts in the extension above the guide member 96 through an aperture in the motor base which is closed by a screw plug |10. The gaskets 34 6 on each side of the ring gear 24 and a gasket |12 between a shoulder on the guide member 96 and a shoulder in the opening 80 in the extension I6 prevent escape of this lubricant, A sealing ring |14 of suitable material is also provided between the insert |08 and guide member 96 to prevent upward leakage of the lubricant being dispensed. i

Lubricant in the extension flows to the interior of the driving member 42 through one or more ports |16 in the skirt 52 on -the driving member, and the upper end of the operating head has a port |18 communicating with the space between the cams '|4, while a second port |80 in the head feeds lubricant to the head of plunger 88. The skirt 18 on operating head 'i2 is also provided with one or more ports |E2 suitably located adjacent its upper end to communicate with the interior of extension I6 and thus prevent hydraulic locking of this part.

In the operation of my improved pump, when the plunger valve |56 is at the position shown in Fig. l, no lubricant will be discharged by the pump even though the motor I8 is operating because the lubricant fed to pump cylinder |||l is bypassed back to the reservoir |2 through radial port |46, annular passage |48, inclined passage |54, and bore |50. However, if the plunger |56 is depressed completely to close the end of inclined passage |54, the pump will deliver a maximum amount of lubricant because the lubricant drawn into the pump cylinder |`|0 on the suction stroke of the piston will be forced from the cylinder past valve ||4 and into high pressure chamber |02 on the up stroke of the piston,

thus charging this chamber. On the down stroke of the plunger |56 the larger upper end of this plunger will be projected downwardly into the high pressure chamber and its greater volumetric displacement, as compared with the smaller lower end of the plunger which moves out of the chamber, will force lubricant past check valve |26 into outlet passage |36 and thence through discharge pipe |38 to the coupler |44.

In order to eliminate the need for accurately relating the volume of lubricant pumped by the piston ||2 on its up stroke to the volume discharged by plunger 88 on its down stroke, the piston is made of such diameter that a slight clearance will exist between the piston and the walls of cylinder HB. Thus, if the Volume displaced by plunger 88 is less than the capacity of piston ||2, the excess will escape around the piston back to the reservoir. It is also to be noted that a suction is produced in the high pressure chamber |02 by upward movement of the larger end of the plunger. This assists in creating a flow of lubricant to this chamber lwhen the plunger valve |56 is closed.

From the above description of a preferred embodiment of the invention it will be seen that the objects of the invention are attained. It will also be apparent that numerous variations and modifications thereof may be made without departing from the underlying principles of the invention. I, therefore, desire by the following claims to include within the scope of the invention all such variations and modifications lby which substantially the results of my invention may be obtained through the use of substantially the same or equivalent means.

I claim:

1. In a lubricant pumping apparatus having a lubricant reservoir and power means for operating the apparatus, the combination comita-secure 1. prisingf. a zlucri'cant' discharging '.fpu'mp including il au piston-andi plunger:.assemblySireciprocablekin one` directionlby;V said :powermeansr forn charging :EsaidLpum'p and 1in-the* 'oppositeldirection if'or-'ldisfchargingflubricaht 'tothe fpa'rttlbe'f lubricated, means? forming4 av Abypass 'for Alubricant between "I said pump and 'reservorgandlfmeanskforcontrolling charging of the pump including afmanually operated valve `controlling "iiowfof lubricant through" said bypass, 'and a' "valve 'automatically operated to admita Chargeof-lubricant toi-'said pump during m'ovementof the-piston and plunger "assembly in" the lone said direction'l when said "manuallyfoperated valve" is operated to' close `'said bypass .Y Y s 2.-*"A 'lubricant' pumping apparatusr asset forth inclaim` 1, wherein the autmaticallyoperating `Yvalve is fpreload'ed automatically' to prevent charging of said pump 'when said 'manually' 'operated valve"isoper`a'ted to open said'bypa'ss.

3. AIn' a lubricant pumping apparatus having a v*lubricant reservoir,V "the combination V'comprising a' pump'cylinder having 'an v"inlet: con'imunicating with said reservoir, a power l operatedl piston for discharging lubricant from said cylinder, -means forming a bypass'establishing 'communieation between `said cylinder 'Y and' reservoir," a chamber for'receiving lubricantdischarged'by said piston "to charge saidehamber, 'diierential' means operating with said piston to force lubricant from said charged chamber to the part to be lubrit cated, valve means between said cylinderand said chamber controlling charging'of' the latter, said Valve means being preloa'cled'to lpreventil'ow V"of'lubricant to said chamber'when'said bypass reservoir, means for connecting said'pump to al 'part tombe lubricated including a.' chamber,Y said 'plunger 'extending through said chamber" and havinga part of increased volumetric displace- 'ment adapted to'be projected therein upon move- 'mentofthe plunger in one direction forv forcing i' lubricant to the part to be lubricated, and coop- "erating means including a manually operated valve controlling said bypass and a valve auto- Amatically operated to admit lubricant to said lchamber upon movement of the plunger in 'the vopposite direction when said manually'operated valve is in' a position closing said bypass.

5."In a lubricant pumping apparatus having a lubricant reservoir and power means for' operat- `fing-the apparatus, the combination comprising a 'pump cylinder having an inlet communicating 'fwith saidfrese'rvoir, 'means forming 'a 'bypass establishing communication betweensaid cylin- .der". and J reservoir, a chamber communicating 'with saidcylinder for receiving lubricantv diss. charged therefrom to 'chargethe chamber, a ypiston in said 'cylinder fordischarginglubrcant therefrom, a'differentialY plunger operatedV by said :power means` for operating said rpiston,"said j plunger having a'pcrtion of increased'volumetric displacement projectedinto said chamber upon movement of said plunger carrying ts'aid'f'piston through its suctionstrolce, said "portion being Vwithdrawn from said'chamber `to permit charging thereof upon movement of said Vplunger ac- Lil 1'ciprocablepistonand plunger assembl' A power means, a hollow generally cylindri'e'aldr-ivtu'ating' said piston: inH a Vdischarging .I direction, cooperating means' controlling. charging of'sad chamber' including -azfmanually'. operated 'valve iicontrolling fi'owof lubricant Athrough said bypass, -and a" `valve.-autopiatic'aily operated .toil admita Icha'rge 'of lubricant 1 'tosaid cham'ber'e'when. :said finanually'operated` valvefis: operated fto' close' said bypass. l v

I 6. Alubricant pumpingapp'aratusaslsetforth irr claim' 5,1 whe'rein the?` automatically operated -valve :Tis lpr'eloaded automatically 'to iprevent i' 'charging' 'offi'said cham-ber when'sa'idl manually operated valve is 'operated to' open said bypass, `saidlatter' valve being'- biased tofop'enlfp'osition.

' '7. In:y a manually portable t mbricantrl pumping apparatus having alubricant'ireservoirlthefcom- 'f bin'ation i confi'prisingaV body'- castinglvfor-supp'ort- Aing the operating parts of said apparatus-ingaged u-pon ksaid', reservoir,l a handle risaidv body casting for` manipulatingsaidcoinpressorlap- '-l-para"tus, a .power 4operatedlubricant discharging pump supported by fsaidlbody castinggme'ans forming a bypasebetweensaid: p'umpfandre'serl Voir, means for? connecting said pump' to the' `part -to be lubricated; and cooperating valve m'eansfor controlling the" ow oflubricant to the' partito-be lubricated -inc'ludingva manually Voperated'f valve for controlling 'the' flow 'off lubricant through 'said 'bypass 'means andian=automatically.'operating valve preloaded to prevent nowlof-lubricant to the part to be lubricated-when saidfb'ypass' means is open, said 'manually operatedva'lve havingia plunger supported in'saidlbo'dy casting-.including a manipulatable partipositioned' to permit opera- `-"tionthereof by'fanger of thehand'hbldingfsaid apparatus.

'8. In. a lubricant-pumping:apparatuslhaving a lubricant reservoir; fthe' combination -coinp1'is ing a lubricant' discharging pump'having a'f'ieo't'ary ing 'member rotated bysaid' power means ani operating head connected to sa'idplunger-as'sembly andl constrained for reciprocatory movementg-f's'aid "head having a'diametrically extending'-eylindrin .cal opening; fccoperatinglmeansfor reciprocating said'operating head1` and plunger assemblylwh'en f said drivlng V4memberis rotated `-including' right `'.-andfle'ft'-hand thread slots inthe 'inner periphery 'of said hollow'drivinlg:member andduplic'ate followersconformed to' beY loosely-"received 'inthe cated;` 'andimanually "operated controllmeans for fi'controlling'il'ow ofilub'ricant-"fro'm said pump-"to apart to be lubricated.

' '9. A lubricant'pumping: 'apparatusl assetforlth '1in Iclaim 8,"wherein the rotarymotor,'idriving member, operating headf. and' reciprocable' plunger -z are axially' aligned.

l0.` Ina lubricant :pumping apparatus :havin ar lubricant reservointhe' combinationzcomprising a body casting having atiportionfiadapted'to be removably engaged with. isaidreservoirand a 'hollow-extension terminatingfadjacent the' bottom of said'v reservoini.'affpump'rcylinderuinrsaid 75 extension adjacent `the lowerfend'` thereoia; piston in said cylinder, a plunger for reciprocating said piston projecting longitudinally of said extension, rotary power means on the opposite end of said body casting from said cylinder having a shaft projecting into said extension, a driving member in said extension, means operatively connecting said power means and driving member, an operating head Ain said extension operatively connected to said plunger, means for effecting reciprocatory movement of said head and plunger upon rotation of said driving member including rightv and left-hand thread slots in said driving member and cam follower means carried by said operating head for engaging in said slots, means secured to said casting for connecting said apparatus to a part to be lubricated, and manually operated control means supported on said casting for initiating or discontinuing dow of lubricant to said part.

11. In a lubricant pumping apparatus having a lubricant reservoir, the combination comprising a lubricant discharging pump including a plunger and piston reciprocated thereby for charging said pump upon movement of the same in one direction and for discharging lubricant to the part to be lubricated upon movement in the opposite direction, rotary power means, means for reciprocating said plunger including a driving member rotated by said powermeans and a reciprocal operating head connected to said plunger, said driving member and head having interengaging right and left-hand thread slots and cam follower means cooperating to reciprocate said head and plunger when said driving member is rotated, means forming a bypass between said pump and reservoir, means for connecting said apparatus to a part to be lubricated, and means for controlling charging of the pump including a manually operated valve controlling flow of lubricant through said bypass and a valve automatically operated to admit a charge of lubricant to said pump during movement of the l piston and plunger assembly in the said one disaid power means having portions of different f volumetric displacement, means for reciprocating said plunger, including a driving member rotated by said power means and a reciprocable operating head connected for reciprocating said plunger, said driving member and head having interengaging right and left-hand thread slots and cam follower means cooperating to reciprocate said head and plunger when, said driving member is rotated, means forming a bypass between said pump and reservoir, means for connecting said pump to a part to be lubricated including a chamber, said plunger extending through said chamber and having a part of increased volumetricV displacement adapted to be projected therein upon movement of the plunger in one direction for forcing lubricant to the part to be lubricated, cooperating means controlling the flow of lubricant to said chamber including a manually operated valve controlling said bypass, and a valve automatically operated to admit lubricant to said chamber upon movement of the plunger in the opposite direction when said manually operated valve is operated to aposition closing said bypass.

13. In a lubricant pumping apparatus having a lubricant reservoir and power means for operating the apparatus, the combination comprising a pump cylinder having an inlet communicating with said reservoir, a piston in said cylinder, a differential plunger for reciprocating said piston, means for reciprocating said plunger including a driving member rotated by said power means and areciprocable operating head connected to said plunger, said driving member and head having interengaging right and left-hand thread slots and cam follower means cooperating to reciprocate said head and plunger when said driving member is rotated, means forming a bypass establishing communication between said pump cylinder and reservoir, a chamber communicating with said cylinder and receiving lubricant discharged by said pump for charging the chamber, said plunger having a portion of increased volumetric displacement adapted to be projected into said chamber for forcing lubricant therein to the part to be lubricated when said chamber is charged, and means for controlling charging of said chamber including a manually operated valve controlling ilow of lubricant through said bypass, and a valve automatically operated to admit a charge of lubricant to said chamber during the discharge stroke of said piston when said manually operated valve is operated to a position closing said bypass. l

14. In a lubricant pumpingV apparatus continuously operable power means, lubricant pumping means including high and low pressure charnbers, a piston in said low pressure chamber for pumping lubricant to charge said high pressure chamber, a differential plunger operated by said power means for operating said piston, said plunger having areas of, different volumetric displacement extending through said high pressure chamber for effecting discharge of lubricant from the apparatus when the plunger is moved in a direction to carry said piston through its suction stroke, means forming a passageway for bypassing lubricant from said low pressure chamber to said reservoir, a manually controlled valve to control communication through said bypass passageway, means forming a passageway to establish communication between said chambers, a check valve controlling communication between said two chambers, and a spring to bias said valve to closed position, said spring exerting sunicient force to resist opening of said check valve when said bypass passageway is open but being yieldable to the pressure generated in said low pressure chamber when said bypass passageway is closed during the discharge stroke of the piston.

15. In a lubricant pumping apparatus the combination comprising a body member including a generally tubular extension, means in said eX- tension forming a rst and second pumping chamber and a passageway interconnecting said pumping chambers, a piston in said iirst chamber for pumping lubricant under relatively low pressure to said second chamber to charge the same, a reciprocatory plunger for operating said piston having areas of different volumetric displacement extending through said second chamber for effecting discharge of lubricant therefrom under high pressure while said piston is being retracted by said plunger, rotary power means, a driving member in said extension rotated by said power means, means in said extension to establish a driving connection between said driving member and a plunger including means for reciprocating said plunger in response to rotary movement of the driving member, means forming a by-pass africa-,ivre

passageway between vthe outlet `end vof 'said first;

chamberV and` said reservoir, -means -for establishing a connection between :the f-secondfchamben,

meansfto bias saidf-checlivvalve atoclosedposition'w-ith aforce sufcient to resistfopening-:of

said-valve during the discharge:stroke-'ofsaid piston-when i said: by-pass passageway is .open-,- said means yielding to the pressure `generated-by fsaid' piston :when saidV by-passl passageway-:isn closed-during the discharge stroke of the lpiston" to=-ad1nit-afcharge oflubricant to -saidsecond chamber.-

16;- Inalubricant pumping apparatus having a lubricantV reservoir,-:the-vcombination comprising a lubricant discharging pump having a reciprocable' piston `and plunger assembly, rotary power means,= alf-hollowl generally lcylindrical driving member; epicyclic reduction gearing driven by said lrotary power means and connectedto said driving memberfor driving thelatter, an operating head conf necrte'd `to saidfplunger vassembly vand:restrained ,1 for-reciprocatory .movement-,f saidhead having va diametrically extending cylindrical opening-cof,- operatingmeans for reciprocating said operating ci head and plunger assembly when said= driving, member Arotated including right and left' hand th'readslots inthe innerperiphery of said hollow drivingfmember andiduplica-te v:followers-:c011- formed tol be loosely receivedrinthe diametrically extending :opening inV said operating head-and 1; having projecting lips to engage in -said :thread I slots at diametrically oppositeupoints,` the conf. frontingends of said followerseachihavingcor-V respondingly located :projecting abutments-'to provide .bearingsurfaces between said followers for g facilitating i relative axial ioscillation- ,thereof in following said thread slots, meansfor connecting saidfapparatus toi afpart to bez-lubricated, andi" manual-ly'operated :control meansv :forxcontrolgling-: flow'fof-,lubricant from saidapparatusato a parttos be-:lubric'ated-` 17.' In alubricant pumping apparatuS,-the come s. bination comprising areser-Voir, aioodyy memberA secured to" one endofrsaid'reservoir and.having-5V a tubular. extensionv depending therein, lubricant; pumping .means in the lower endof saidextensionf1 including a 4reciprocable Y piston and plunger-fase sembly, rotary power means on.said.bod-ymenflbernr having a rotatable' shaft projecting intolsaid eX-, tension-reduction gearing in said extension .driven froml said shaft,y azgenerally-cylindrical. shapedf; driving member closed at `voneend and lrotatablyg vfjournaledat itsv other end in said eXtensiony-,said

controlled means tocontrolfiowof lubricant f1"0mAv .saidiapparatus tothepart to be lubricated.

18. :A lubricant pumping :apparatus as denedx; iniclaim: 17 whereinwthe cooperating :means w0nw said driving member;` and.. plunger fdr, reciprocate ingzthe latter inresponse to rotary movement 'of- :1 the ,driving :member includes right and lefthand 4 thread islotson one of said partsand-diametrically4 opposit'ely disposed thread. slot followers yfixed fto'v i the other parte,

` MARCELGARANCHER;

REFERENoEssciT-ED;

The following references are or-record inthe l'e #of this :patent: v

UNrrED; STATESfre'rrn'rsa Number: Name Date 1,316,558 Cannon-1, Sept. '2351919

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