US1943605A - Greasing apparatus - Google Patents

Description

Jan. 16, 1934. M N 1,943,605

GREASING APPARATUS Filed Nov. 23, 1931 3 Sheets-Sheet 1 li w bray:

Filed Nov. 23, 1931 3 Sheets-Sheet 2 Em 5 Ha \w an 50 um I fw. 6 00 (I 5 l I. Q zw fl 4 Z w m a Mil ll 4 FM r N 6 w w wan/w 0 Mi M Jan. 16, 1934. G. H. HARTMAN enmsme APPARATUS Filed Nov. 23, 1931 3 Sheets-Sheet 3 Patented Jan. 16, 1934 UITE ST TES GREASING APPARATUS George H. Hartman, Bryan, Ohio, assignor to The Arc Equipment Corporation, Bryan. Ohio, a

corporation of Ohio Application November 23, 1931 Serial No. 578,689

lzclaims.

An object of my present invention is to provide a. greasing apparatus or lubricant dispensing device of portable character which may be operated by an electric motor or other power means and which is comparatively simple in proportion to the results obtained.

A further object is to provide a pump structure in which flrst, second and third stage pumps are provided with an automatic means for rendering the second stage pump ineflective and the third stage pump eflective, such means being operated by the pressure of the lubricant being dispensed.

Still a further object is to provide a greasing apparatus or lubricant dispensing structure in which two pumps are provided, one for pumping a large volume of lubricant at low pressure and the other for pumping a small volume of lubricant at high pressure, both pumps being continuously operated from ,the same source of power, but only one of them being eiiective at a time.

A further object is to provide means for normally allowing lubricant pumped by the low pressure pump to pass through the high pressure pump without the high pressure pump imparting a high pressure to such lubricant, but the high pressure pump being eflective and the low pressure pump fittings and will normally quickly lubricate them under low pressure, but will more slowly lubricate them under high pressure if resistance to the' flow of grease into the fitting is encountered.

Still a further object is to utilm the built up pressure caused by such resistance for automatically rendering the low pressure pump ineiiective' so that the high pressure pump can then operate, this operation being entirely automatic so that it does not require any of the user's attention.

A further object is to provide a pair of pumps, one being of high pressure type comprising a cylinder and a plunger, the plunger during a portion of its'reciprocation being removed from the cylinder whereby the other pump may pump a large volume of lubricant through the cylinder during the period of time that the plunger traverses such portion oi its reciprocation.

Another object is to pro ide a modifled'form of construction in which the pump that is rendered ineiiective may be adjusted to an operative position manually so that the pump can operate continuously but will be eiiective' as a pump only when so manually adjusted.

With these and other objects in view my invention consist in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 is a plan view of a portable greasing apparatus or lubricant dispensing device embodying my invention.

Figure 2 is a side elevation of the same, parts thereof being broken away and other parts shown in section.

Figure 3 is a vertical, enlarged, sectional view on the line 3-3 of Figure 2.

Figure 4 is a sectional view on the line 44 of Figure 3.

Figure 5 is a sectional view similar to the top portion of Figure 3 showing the modifled construction.

Figure 8 is an enlarged, sectional view on the line 88 0! Figure 2 showing the third stage pump.

Figure 7 is a sectional view on-the line 7--'1 of Figure 3 showing the first stage pump; and

Figure 8 is a sectional view on the line 8-8 of Figure 3 showing the second stage pump.

on the accompanying drawings I have used the reference numeral 10 to indicate an original container for grease or other lubricant. The container 10 has an opening 12 in the top thereoi through which the intake tube 14 of my lubricant dispensing device may be inserted.

The intake tube 14 is supported by a flange 16 resting on top of the container 10. A hub member 18 is secured to the lower end of the intake tube 14 and a second stage pump housing 20 in turn is secured to the hub 18 as by bolts 22. A worm gear housing 24 is secured to the flange 18 as by bolts 26. A tubular drive shaft 28 is journaled in bores 30 and 32 of the hub 18 and the housing 24 respectively.

A flrst stage pump member A is keyed to the lower end of the drive shaft 28 and includes upper and lower flanges 34 and 38. The flange 34 is provided with a pair of outlet openings 38, while a pair of spirally arranged wall members connect the flanges 34 and 36 together. The walls 40 are arranged as shown in Figure 7 so that they provide inlet openings 42 into which the lubricant is forced as indicated by the arrows a when the pump member A rotates in the direction of thearrow b. o

The flange 36 in the intake ends 42 is relatively low compared to the opposite ends 44 as perhaps best shown in Figure 3, partly by dotted lines. It is therefore obvious that rotation of the pump member A in the direction of the arrow b will cause lubricant from the container 10 to be elevated from the intake ends 42 to the opposite ends 44. .1

The outlet openings 38 of the, 84 communicate with an inlet ope 432'6fthe second stage pump-housing 20 (see 3 and a). A

second stage pump rotor 48 is keyed to the tubular shaft 28 and is provided with lobes 50 contacting with the interior shaft of the housing 20. Different rotors 48 may be substituted for the one shown having more or less marked lobes 50 for pumping greater or less quantities of lubricant by the rotor 48.

A wiper 52 is slidably mounted in a square socket 54 of the housing 20 to wipe lubricant from the lobes 50 as the rotor 48 rotates in the direction of the arrow b and causes flow of such lubricant into a discharge passageway 56. The wiper 52 is normally and resiliently retained in contact with the rotor 48 by a spring 58.

The discharge passageway 56 extends up through a web 60 of the hub 18 (see Figure 3) and discharges into the intake tube 14. The lubricant is then forced up through the tube 14 by the second stage pump rotor 48 and into a cavity 62 of the worm gear housing 24.

The cavity 62 communicates with a cavity 64 (see Figure 2) with a check valve 66 interposed between the two cavities. The check valve 66 is mounted in a valve cage 68 and is spring pressed to close against the cavity 62 by a spring 70.

The cavity 64 communicates with a cavity '12 in a third stage pump housing 74. Within the housing 74, I provide a third stage pump assembly 13 consisting .of a guide member75, a valve cage 76, a closure nut 78 and other associated parts, which will now be described. All are mounted in a bore 80.

The guide member '75 is seated against a gasket 82 and against a shoulder 84. The cage 76 is screwed into a threaded portion 86 of the bore and bears against a cylinder member 88 which is mounted in the guide member 75 and causes the guide member to seat against the shoulder 84 and against the gasket 82, the gasket being slightly compressible so that both joints can be rendered tight.

Within the valve cage 76.1 provide a primary check valve 90 seated against the cylinder member 88 and a secondary check valve 92 seated against a seat 94. From the cylinder member 88, lubricant can be forced past the check valves 90 and 92 and through the passageway 96 into a cavity 98. The closure nut 78 retains the valve cage 76 in position and completely encloses it.

The tubular shaft 28 is rotated from a motor 100 which is provided with a worm 102 meshed with a worm gear 104. The worm gear 104 is keyed to the tubular shaft as shown in Figure 3. The shaft of the motor 100 extends into the third stage pump housing 74 as indicated at 108, and is provided with an offset or eccentrically mounted crank pin 108. A roller is mounted on the crank pin 108' for contact with a plunger 112 guided in the guide member 75 and adapted to enter the cylinder 114 of the cylinder member 88 during a portion of the reciprocation of the plunger, The plunger 112 is held in engagement with the roller 110 by a spring llfi engaglng a flange 118 of the plunger. A sleeve member 120 encloses the spring 116.

The cavity 98 into which the lubricant is forced after passing the check valves 90 and 92 communicates by a passageway 122 with a tube 124. The tube 124 extends to-a header 126 which in turn communicates with aftubular'dlspenslng hose 70 ,and 2).

ball 132 normally seated by a follower pin 134 and a spring 136. The tension of the spring 136 is adjustable by rotating an adjusting sleeve 138. A lock nut 140 is provided for the adjusting sleeve 138. A closure nut 142 normally encloses the valve C but may be removed for adjusting the sleeve 138.

Referring to Figure 3 it will be noted that I have provided a backing block 144 for the spring 58. A bell crank lever 146 is pivoted on a bracket 148 and has a roller 150 engaged with a control rod 152. The control rod 152 extends through the tubular drive shaft 28 and into a cavity 154 of a hub 156. The hub 156 is formed on a cover plate 158 for the worm gear housing 24.

A cylinder member 160 is screwed into the upper end of the hub 156* and has a cylinder bore 162 to receive a piston 164 of the control rod 152. The rod 152 and the piston 164 are packed relative to the hub 156 by packings 166 and 168 respectively. These packings are retained tight by springs as clearly shown.

The control rod 152 is normally retained in the position of Figure 3 by a spring 170 of sufficient i tension to normally aid the spring 58 in keeping the wiper-52 against the pump rotor 48 and the tension of the spring 170 may be adjusted by an adjusting screw 172.

The cavity 154 is hydraulically connected with j the header 126 by a pipe 1'74. This serves to introduce the pressure built up in the hose 128 into the cavity 154 for acting on the piston 164 as will hereinafter be described.

In- Figure 4 I have shown how the pipe 174 3 is connected with the hub 156 and sealed relative thereto. It will be noted that the pipe has a shoulder 1'76 seating against a seat 178 of the hub 156. The shoulder and seat are retained in tight engagement with each other by a cap screw 180. The cap screw 180 seats against a seat- 182 of the'hub 156 and screws into the pipe 1'14 wherebytightening of the cap screw draws the shoulders 1'76 and 178 together, as well as drawing the head of the cap screw 180 against the seat 182. 1

teristica. The control rod 1520. in 'this inl stance is retained in raised position by a spring 186. The control rod may be lowered manually by a lever 188 which 'is pivoted by a link 190 to an ear 192 on the closure plate 158a. The purpose and use of this modification will be herein- 1 after described.

Practical operation Having fully described the details of construction of my portable greasing apparatus or lubri- 1 eating device, I will now describe the operation thereof:

with the pump motor 100 in operation, the first stage pump A and the pump rotor 48 will be continuously rotated and likewise the crank pin 1 108 will be continuously rotated for imparting reciprocation 'tothe plunger 112. with the nozzle portion 1310! the discharge nozzle 130 connected with a lubricant receiving fitting, the

valveof the nozzle may be opened by depressing 1.

11 the fitting will receive lubricant freely the normal operation of the m is as follows:-

The rotating first stage pump A picks up lubricant from the container 10 and discharges it through the eway 46 into the housing 20.

The pump rotor 48, in conjunction with the wiper 52, pumps a large volume 01' lubricant at low pressure up through the eway 56, intake tube 14 and check valve 68 to the cavities 64 and 72. From the cavity 72 the lubricant passes through openings '13 and 71 and then through the cylinder 114 while the plunger 112 is in the medpositionoil 'igurefl. Thislargevolume of lubricant opens the check valves and 82 and fiows through them and the w: eway 96 into the cavity 98, from which it fiows through the passageway 122 and pipe 124 and on to the hose128sothatitcanbesuppliedtothedischarge nozzle 130.

The foregoing normal operation permits of quick filling of the bearing on which the lubricant receiving fitting is mounted, but ii it so happens that great resistance is encountered. because oi'thebearingbeingcloggedortoranyother reason,thepressureinthehosewillbebuilt up and will likewise be built up in the cavity 154 (seel'igureii). Thiscausesthepiston 184tobe raised against the action 01 the spring 170, therebythetensionotthespring58so that the wiper 52 is ineil'ective and consequently renders the second stage pump inefiectivc even thoughtherotorsscontinuestorotate. '1herotor 48 and the first stage pump, however, continue to supply lubricant, through the intake pipe 14. to the space around the plunger 112 with plenty 01 chance for slippage oi the first and second stage pumps relative to the lubricant, because of their attempting to suDPLY more lubricant than canbehandledbythethirdstagepump.

Practically the entire power of the motor willnowbeutilizedinoperatingthehighpressure third stage pump plunger 112 for supplying the lubricant under much higher pressure than possible by the second stage pump rotor 48. This willbeevidentbecauseotthepressureinthe hose128beingbuiltuptosuchanextentthat the second stage pump is rendered ineil'ective by the control rod 152 as just described, and the plunger 112 will force a small quantity of lubri cantathighpressure intothehose 128eachtime the plunger reciprocates into the cylinder 114. Assoonasthehigh pressureconditionisrelieved, the spring 170 will force the control rod 152 downwardly so that the second stage pump is again and automatically rendered effective and accomplishes the dispensing operation thereafter until high resistance is again encountered. Thus it will be obvious that large quantity, low pressure dispensation normally occurs, but small quantity. high premure dispensation is automatically efiected whenever called for because of conditions en-.

countered.

'lhe check valve 66 serves to trap a quantity of lubricant in the cavities 84 and 72 which is supplied'to the thirdstage pumpBwhen pressurebuiltupinthehose128andthecavityl54 raisesthepistonlfiiorthetensionoi' thespring58andthusrenderlngthesecond stage pump inefiective. 'l'he by-pass valve 132 is'providedforanemergencyinwhichthebearingisirosenandthethirdstagepumphasa tendacytobuildupapressureinthehosela whichwouldeventualiyburstthehoseorcause other damage. It will be obvious that before such an excessively high Pressure is reached, the valve 182willopenagainstthetensionotthespring 138 so that a reciprocation or the plunger 112 way 181.

Although I have illustrated first, second and third stage pumps. the second and third stage oniycanbeused,orthefirstandsecond can be used for a dlspenser which disonly a large quantity oi lubricant at low Again, the second stage pump only used. In the event that the first and 152a may still be utilized. It where the motor 100 operates com the second stage pump is norineii'ective, by the spring 185 raising the 152, but can be rendered manually efiective Changes as shown in the modification and others as well, can be made without departing from the real spirit and purpose of my invention. and it is my intention to cover by my claims, any modified torms of structure or use 01' mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:-

1. A lubricant structure comprisingfirst,secondandthirdstagepumps,adischarge nodule, means for normally causing dispensation o! a large volume ot'lubricant therethrough at low pressure by sa d second stage pump. said third stage pump being operative to pump a small volume or lubricant through said discharge nozzle at high pressure upon the lubricant a predetermined resistance during dispensation from said discharge nozzle andmeansoperatedbytheincreasedpressureof the lubricant in said nozzle for rendering said second stage pump inefiective as a pump and operable only as a movable'element in the lubricantfiowingiromsaidfirststagepumptosaid third stage pump upon such operation of said third stage pump.

lAlubrlcantd structurecomprisingfirst. second and third stage pump i second stagepumpcomprisingarotorandamovable wiper, a discharge noasle, means for normally causing dispensation of a large volume of lubricant therethrough at low pressure by said second stage pump, said'third stage pump being automatically operative to pump a small volume of lubricant through said discharge music at high pressure upon the lubricant encountering a predetermined resistance durlng dispensation from saiddischargenouieandmeansoperatedbythe increased pressure of the lubricant in said nozzle for moving said wiper to an ineiiectlve position uponsuchoperationoi'saidthirdstagepump.

8. In a lubricant structure, a disdischarging lubricant therefrom, means for continuously and simultaneously operating said pumps, said second stage pump including a rotor and a spring urged wiper blade coacting with the periphery thereof and manually operable means for moving said wiper blade to non-wiping position to thereby render said second stage pump inoperative to pump lubricant when desired 5. In a lubricant dispensing structure, a discharge nozzle, first and second stage pumps for discharging lubricant therefrom, means for continuously and simultaneously operating said pumps, said second stage pump including a rotor and a wiper blade coacting with the periphery thereof and means to move said wiper blade to a non-wiping position to render said second stage pump inoperative to pump lubricant, said means being automatically controlled dependent upon the pressure of the lubricant being dispensed.

6. In a lubricant dispensing structure, a dis charge nozzle, a primary and a secondary pump for dispensing large and small volumes of lubricant therethrough at low and high pressures respectivelv, said primary pump being normally operable to pump lubricant without said secondary pump'imparting high pressure thereto, said secondary pump including a rotor and a wiper blade coacting with the periphery thereoi and pressure operated means responsive to in said discharge nozzle to move said wiper blade to non-wiping position and thereby render said primary pump inoperative to pump any lubricant and said secondary pump operative to pump lubricant at high pressure.

7. In a lubricant dispensing structure, a discharge nozzle, first and second stage pumps for discharging lubricant therefrom, said second stage pump being of rotary type, power means for continuously operating movable elements of said pumps and means to move one of the movable elements of said second stage pump to inoperative position to thereby render the pump inoperative to pump any lubricant and thereby eliminate the need of any power being expended to overcome inertia or momentum of lubricant when the second stage pump is rendered inoperative even though one oi the movable elements thereof is still being operated by said power means, said means being responsive to pressure in said discharge nozzle.

8. A lubricant dispensing structure comprising primary and secondary pumps, D wer means to simultaneously operate said pumps, said secondary pump being of reciprocating type including a cylinder and a plunger, said plunger, during a portion of its reciprocating movement aI owing now of lubricant from the space around said plunger into said cylinder, said primary pump normally pumping lubricant into said cylinder during the time when the plunger traverses such portion of its reciprocating movement, movable means to render said primary pump ineiiective as a pump and said pump effective to discharge lubricant from said discharge nozzle under volume of lubricant through said discharge nozzle at high pressure upon the lubricant encountering a predetermined resistance during dispensation from said discharge nozzle and means for rendering said second stage pump ineffective as a pump and operable only as a movable element in the lubricant flowing from said first stage pump to said third stage pump upon such operation of said third stage pump.

10. In a greasing apparatus, a large volume low pressure pump, an intermediate volume intermediate pressure pump and a small volume high pressure pump, said pumps being hydraulically connected in series, a nozzle at the discharge end of the third pump, said third pump including a cylinder and a plunger, said plunger in one position permitting the second pump to pump grease past the plunger and into and through the cylinder and means to permit the first pump to pump grease through the second pump directly to the third pump and the third pump only to pump said grease from said nomle at low volume high pres- 11. In a greasing apparatus, a large volume low pressure pump, an intermediate volume intermediate pressure pump and a small volume high pressure pump, said pumps being hydraulically connected in series, a nozzle at the discharge end of the third pump, said third pump including a cylinder and a plunger, said plunger in one position permitting the second pump to pump grease past the plunger and into and through the cylinder and means responsive to pressure in said nozzle to permit the first pump to pump grease through the second pump directly to the third pump and the third pump only to pump said grease from said nomle at low volume high pressure.

12. In a apparatus, a large volume low pressure pump, an intermediate volume intermediate presure pump including a rotor and a wiper and a small volume high pressure pump, said pumps being hydraulically connected in series, a nozzle at the discharge end of the third pump, said third pump including a cylinder and a plimger, said plunger in one position permitting the second pump to pump grease past the plunger and into and through the cylinder and means to render said wiper ineffective and thereby to permit the first pump to pump grease through the second pump directly to the third pump and the third pump only to pump said grease from said nozzle at low volume high pressure.

GEORGE H. HAR'IMAN.

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