US1924068A - Lubricant reservoir and pump for central lubrication systems - Google Patents

Description

Aug. 22, 1933. F. H. GLEASON 1,924,068

LUBRICANT RESERVOIR AND PUMP FOR CENTRAL LUBRICATIQN SYSTEMS Filed June 18, 1928 5 Sheets-Sheet 1 //v VEN TDFE' WITNESS gafi w i ATTU EYE' Aug. 22, F. H GLEASON LUBRICANT RESERVOIR AND PUMP FOR CENTRAL LUBRICATION SYSTEMS Filed June 18, 1928 5 Sheets-Sheet 2 hvvmvran ilnlllllllllilllniuuv ll A:

ATTUE'NEYE Aug. 22, 1933 F. H. GLEASON 1,924,068 LUBRICANT RESERVOIR AND PUMP FOR CENTRAL LUBRICATION SYSTEMS Filed June 18, 1928 5 Sheets-Sheet s 5 /vvE/v TUR WITNESS 43197 ATTORNEYS Aug. 22, 1933. F, H GLEASON 1,924,068

LUBRICANT RESERVOIR AND PUMP FOR CENTRAL LUBRICATION SYSTEMS Filed June 18, 1928 5 Sheeis-Sheet 4 INVN ToR S S E T l W TTORNLFYS 5 Sheets-Sheet 5 Aug. 22, 1933- F. H. GLEASON LUBRICANT RESERVOIR AND PUMP FOR CENTRAL LUBRICATION SYSTEMS Filed June 18, 1928 R m I m w m I N I Ill. dlwfi HUI H W o 000 Z 0 00 I 47/4V/A Patented Aug. 22, 1933 Uinrao STATES LUERICANT RESERVOIR AND PUMP FOR CENTRAL LUBRICATION SYSTEMS Frederick H. Gleason, Auburn, N. Y., assignor to Bowen Products Corporation, Auburn, v Corporation of New York Application June 18, 1928. Serial No. 286,310

16 Claims.

This invention relates to a certain new and improved lubricant reservoir and pump for central lubrication system.

This invention is adapted for use with lubricant distribution systems such as are disclosed in Gleason No. 1,580,823, April 13, 1926; Gleason No. 1,629,453, May 17, 1927; Gleason No. 1,592,- 199, July 13, 1926; Gleason No. 1,553,768, July 21, 1925; Gleason application Ser. No. 630,228, filed April 6, 1923; Gleason application Ser. No. 138,- 234, filed September 28, 1926; Gleason'appli'cation Ser. No. 138,235, filed September 23, 1926; Gleason application Ser. No. 150,245, filedNovember 23, 1926; or with a system using improved capillary fiow control resistances disclosed in a companion application about to be filed. v

The main'object of the invention is the production of a new and novel pump assembly contained Within an oil reservoir. whereby a highly eficient, comparatively inexpensive and easily manufactured source of oil supply under pressure adapted for use with central lubrication systems for lubricating machinery, automobiles and similar devices, is produced.

Other objects and advantages relate to the details of the structure and theform and relation of the parts thereof all as will more fully appear from the following description taken in connection with the accompanying drawings in which:

Figure l is an elevation of an apparatus of this invention installed upon an automobile.

Figure 2 is a section on line 2-2, Figure 1. Figure 3 is a'section on line 3--3, Figure 1. Figure 4 is a section of a slightly modified form of device.

Figure 5 is a section of a further modified form of device.

Figure 6 is a section of another modification. Figure 7 is a section on line 7-7, Figure 6. Figure 8 is a section of a further modification.

Figure 9 is a top plan of perhaps a preferred embodiment of the invention.

Figure 10 is a section on line 10-10, Figure 9. Figure 11 is a section on line 11-11, Figure for-"the reception of an annular gasket 18 is further provided with a substantially central opening surrounded by a threaded boss 5.

A pump cylinder guide and outlet assembly is provided at the bottom of the reservoir and this assembly includes a tubular fitting 6- provided with an external shoulder separated from the inner surface of shell --2- asby a gasket 7. The fitting penetrates the wall of the shell -2- at itscentral' portion and ,is locked imposition by a nut 8-. .A removable plug 9- isscrewed into the bottom of the tubular fitting 6 with a suitable gasket- -lO- to provide an oil tight connection. The outlet tube 11- may be secured to plug --9 in any suitable manner asby tubing sleeve 12 and tubing nut --l3--. 'The removableplug 9- supports a filter 14 which rests upon the raised edge of the plug and is spaced from the surface of the plug at the central portion of the latter: 'This filter may be held in positionv by spring l5- and'the filter may be formed of a thin disc or capillary material such as alundum or course porcelain or it may be one or more thicknesses of a very fine gauze meshed screen.

A drawn shell or tube -16-- has its lower end threaded into the boss -5-- andis shouldered at --1'7-- for a purpose to be hereafter described. A recess preferably of annular form is provided in the upper face of the fitting -6 of soft material such as leather or Vellumoid packing and the fitting is slotted at 19- just above the uppersurface of gasket -18- to provide an oil port or passage from the reservoir 'to' the cylinder -20--. .When the .latter is in raised position as shown in Figure 8 the fitting -6 has a portion extending upwardly into the reservoir above the gasket l8 and this portion is preferably of circular form and constitutes a ring or .loosefitting guide -'21-- surrounding the lower end of the cylinder -20. The upper end of cylinder -20 fits loosely within thelower enlarged end of shell 16- and the cylinder is of somewhat less length as for instance of an inch than the distance between the upper surface of gasket l8 and the inner surface of the shoulder 17 so that the cylinder is free to move up and down Within the limits described. The pump cylinder 20. 05 comprises a tube orcylinder having its lower end bent inwardly to provide an annular flange --22- which flange acts as a valve face in its contact against the soft gasket --18. A piston --23 is arranged within the cylinder --20 and this piston, as illustrated, comprises a v this hole.

leather cup washer 24 mounted upon the reduced end of piston rod -25 and held in place between washer -26- and headed nut 27 threaded upon the piston rod. The head of the nut -27- is of sufficient size so as to contact with the inner surface of flange 22-. The piston rod 25- extends upwardly through cylinder -20 and shell 16 and projects above the shell for ecurement to a suitable actuating means as a flat flexible steel ribbon 28- which may be secured in the slotted end of the piston rod -25-. Spring -29 is confined between washer 26- of the piston assembly and the end of the shell -l6- and acts to normally hold the piston assembly in the position shown in Figure 3.

As before suggested the cylinder 20- is a sloppy fit in its guide at both the top and the bottom and is free to line itself up regardless of any spring or distortion in the reservoir shell or cover of the device.

The tube -20 may be designed for up and down movement within any desired limits as efiected by frictional engagement of the moving piston assembly with the interior surface of the cylinderas' suggested a movement of of an inch is found satisfactory.

The downward movement of the cylinder is limited by contact of flange --22 with 'the upper surface of gasket -18- and in that position the cylinder acts as a valve closing communication between the lower end of the cylinder and the reservoir.

When the piston assembly is drawn upwardly carrying'cylinder --20- along with it to a position as illustrated in Figure 8 oil is drawn from the reservoir into the cylinder, the (upward movement of the cylinder being limited by shoulder -17- and when the piston has been raised a sufficient distance to draw the required amount of oil, the spring 29 having been compressed by such movement, the spring thereafter acts to move thepiston downwardly and in so doing moves cylinder 20 downwardly until flange +22- strikes gasket -l8 whereupon further movement of the piston will eject oil from cylinder -20 through fitting 6- into outlet tube -11-.

The cylinder -20' may as shown be provided with an opening 99 near its upper end permitting any lubricant in cylinder tube -20 above the piston assembly to return to the reservoir 1 The annular hole in the top of drawn shell 16- through which piston rod -25 operates is positioned at a height above the maximum oil level of the reservoir -l+ so that the portion of the piston rod 25- which comes out of this hole will not carry any oil out of The slot 99 in the cylinder tube 0- allows any oil in cylinder tube 20- above the piston assembly to be returned to the reservoir -1 when the piston assembly is raised.

The combined tank and pump of Figure 3 can be mounted in any suitable manner and as illustrated in Figure 1 is shown as secured to the frame -31 of an automobile. The lever 32 for actuating the piston may be pivoted upon the dash board 33- and extend through the'dash board for manual operation from the drivers seat.

The flexible steel ribbon 28- may extend around the cam head 3 lupon the lever, however this structure is merely illustrative of -mosphere as through outlet pipe 45.

shell -33 may perhaps preferably be of cylina suitable assemblage and method of operation.

The structure shown in Figure l is similar to the disclosure of Figure 1 except that the outlet fitting assembly includes a spring closed ball check valve -35- which normally prevents the outflow of oil through the fitting except under pressure applied by actuation of the piston assembly. This check valve may be associated withany one of the structures herein disclosed in the manner illustrated in Figure l.

Further a sleeve 36 is. threaded upon the upper end of the drawn shell -l6 and lock nut -3'7 is provided for maintaining the parts in any relative position of adjustment. 7

A cotter pin 38- is passed through the piston rod 5- so as to strike against the upper end of the shell l6 and against the inner wall of the sleeve -36- to limit the stroke of the piston. By this construction the stroke of the piston is made adjustable so that the pump may be set to deliver a certain volume of oil less than that delivered at full stroke. This construction is or" use when the system is assembled to provide a continuous feed to a machine which is operated, as for instance, for 8 hours, the controls or" the distribution system being adjusted for a feed and the pump stroke adjusted so that the plunger will descend in approximately the same time interval that the machine is operated thus providing a continuous feed for the machine during operation.

A further modified form of structure is illustrated in Figure 5 in which the pumping device is adapted for operation by hydraulic or air pressure from any available source. In this particular disclosure a drawn steel shell 39- is secured at its upper end by a tubular rivet l0- to the cover -3- of the tank and pressure conveying tube l1- is connected to the rivet -40- as by means of tubing sleeve -l2-.- and tubing nut l3.

The line leading to the tube ll-- may contain a three-way valve 4\-4 which permits the supply of fluid under pressure to pipe 4lin one position of the valve and in another position permits venting of the pipe -dlto the as- The drical form and depends within the oil reservoir and its lower end, as illustrated, is externally threaded for receiving the internal flange of a cap member 4=6- having a central opening surrounded by a boss 47.

The boss l7 acts as a guide for the piston cylinder 48- and the cap --46-- acts as a stop to limit the upward movement of the cylinder 48. Cap l6 may be provided with a hole or opening --e9 to permit the flow of oil into and out of the tube 39-.

A leather cup washer -5l) is assembled upon the upper end of piston rod -51- in any suitable manner as by being confined between washer -52 and nut 53 threaded upon the end of the piston rod -5l, and spring" 54- is interposed between the washer -52 and the cap {l6 to normally maintain the piston assembly including cup leather -50 in its upmost position.

The oil pump piston is positioned in the cylin-- der i8 and although it may consist of a cup leather assembly it is illustrated as a metal piston 55 having a close fit within the cylinder i8-.

This form of piston is adapted for use with distribution systems employing controlled or metering devices such as are shown in Gleason Patent 1,553,768, Gleason applications, Serial Nos. 630,228 and 150,245 in which it is necessary to relieve the pressure from the line to either permit the measuring device or controls to operate or to reload;

The use of this type of piston permits a very slow leak of oil by the piston until the piston reaches the end of its stroke when the oil pressure on the line will be relieved by the clearance between the piston and the cylinder in which it moves.

When the metal piston such as -55-threaded or otherwise secured to the piston rod 5lis utilized, an expanding washer or friction washer --56 is employed to provide the necessaryfriction to raise and lower the cylinder l8 in accordance with the movements of the piston. As shown, washer 56 is secured to the piston rod -5l and has a skirt portion which is adapted to contact with the interior surface of cylinder 48. The outlet fitting assembly is the same as that disclosed in Figure 1 and the lower end of the tube --48 is loosely guided in the same manner as the lower end of the tube -20' and acts in the same manner in connection with the soft gasket g 2 Figure 6 illustrates a further modified form of structure adapted especially to supply. oil to measuring devices which require a venting or release of pressure in the line to allow the control or measuring devices to reload. The structure, Figure 6, differs from Figure 5 in that the cap 46- is flanged outwardly so that its edge contacts with the inner surface of the wall of the shell 2--.

In this manner the upper portion of the oil reservoir is separated from the lower portion except for a plurality of openings or passageways 57 through the flange or partition 58--, such openings being covered or closed by screens 59- or other filtering means.

The guide 60 for the cylinder 48-- is considerably elongated and is formed integrally with the fitting 6 so that the lower end of the cylinder -4=8 will always be guided to a correct seat on the soft gasket 18.

In the disclosure, Figure 6, the guide flange or boss -47 is omitted and instead of metallic piston 55- a cup leather assembly '24 is utilized similar to the piston assembly of Figure 1 except that the lower end of the piston rod 51 is formed with an axial conduit leading up:

wardly to a diametrically disposed conduit opening into the cylinder -39-.

Any lack of alinement between the upper cylbe compensated for by a slight bending in the cup leathers of the upper and lower piston assemblies.

The spring 54 in Figure 6 is held by a washer 62 that is free to locate itself upon the upper surface of the cap 46-.

For the purpose of providing a slow venting or release of pressure in the system a pin 63-- is positioned in the axial passageway in the 'lower end of the piston rod and piston and this pin nearly fills the passageway and is held in position in any suitable manner as by a cotter pin 64 positioned in the diametrical opening 65. This structure provides a means to slowly allow oil to pass from cylinder 48 under pressure back into the cylinder 39- and the reservoir, in that manner relieving any pressure that may be in the outlet tube structure there shown consists of a reservoir -70- including a cover 71 equipped with a removable oil screen '72 and a removable filler cap 73. Further, the cover -71' is provided with an inverted cup shaped flanged shell 74- having an opening through which the piston rod '75 moves, this shell is held against the cover 71- by the action of the spring -76, a gasket between the lower outwardly flangeddiameter of the shell '74-- and the bottom surface of the cover 71 providing an oil tight connection. Further this inverted cup shaped shell -74- constitutes an enclosure and stop for the upper end of spring 76-- which actuates the pistin in one direction and 109 it also acts as a guide and stop for the upper end of the cylinder 77 within which the piston moves, and as shown the upper end of the cylinder tube 77' isflared outwardly so that its free edge is loosely guided by contact with interior surface of the member --74. The outwardly flared upper end of cylinder -7'7- provides for the easy assembly of cup leather --87 in cylinder -'77. The opening in the top of the cup shaped flanged shell 74 through which the piston rod 75 operates is positioned at a height above the highest oil level in the reservoir so that the portion of the pistonrod 75- which comes in contact with the oil in operation of the piston rod 75-- does not pass through the opening in the top of the shell -74 through which the piston rod -'15 operates preventing the rod from carrying any oil out 'at this point.

The reservoir -70 is supported by a bracket -78-, having wings -79- which may be spot welded to the cover --'71-, and by a bracket -l00 which may be spot welded to the lower part of the reservoir shell "70--. These brackets may be secured to-the dash of an automobile or other place of attachment, as by bolts 80-.

The operating lever81' may be madefrom pressed steel and hardened, the lever 81 is pivoted upon a pin or shaft -82 mounted in the opposedwalls of the bracket ---78--- and is formed with two spaced cams or curved arms 83- disposed upon opposite'sides of the'piston 'rod 75- and positioned beneath the hardened enlarged head -84 upon the piston rod 75 so that the rocking movement of the opcrating lever -81 will elevate the piston within the cylinder --7'7 against the action of spring -76-.

Further, in order to maintain the operating 7 lever 81 in the position shown in Fig. 10 ready for downward rocking movement by the foot or hand of an operator, torsion spring 85 is coiled about shaft --82 and has one arm or end in contact with the lever -8l and its other arm or end in contact with a stop member 86 which may be spot welded to! the bracket 78- as best illustrated in Fig.

10 so that downward movement of lever +81- tensions this spring and the spring willreturn the lever to the position shown in Figure 10 after each operation of ,the lever 81-. The spring prevents any noise or rattle that might be due to play in the assembly of lever .-81- on pin 82 in bracket -73-, and it also prevents any stifiness or binding of lever -8l from detracting from the efiective push of the piston spring 76. Lever 81- is always maintained up in position shown in Fig. 10 so that it is always out of the way of the feet of the vehicle operator except when lever -8l is being depressed. Stop member 86- also nearly closes the U shaped section of the lever 81- practically preventing any air circulation through the opening in the dash through which the lever 8l passes.

The piston rod 75 is provided at its lower end with apiston assembly comprising a fiat washer l05, a cup leather piston 87-, a cup leather metal expander l0%, and a nut 88, all of the parts being clamped against the shoulder on the lower end of the piston rod '75 by the nut -88 threaded on the reduced diameter of piston rod --75-. The nut 88-- is adapted in the lowermost position of the piston rod '75 to seat upon the inturned flange 89 of the cylinder tube '77- and this fiange in turn seats upon the resilient washer -9G which constitutes a valve seat to prevent communication between the reservoir -'70- and cylinder tube -'77- through openings or passageways 9l formed in the upstanding circular guide fiange 92- formed in the tubular outlet fitting 93--- which may, as shown, be threaded into the reservoir '70-. Suitable packing 94- is preferably interposed to form an oil tight joint.

The lower end of the piston rod -75-- is formed with an axial passage or hole 95- drilled therein and extending upwardly a desired distance, and this passage communicates with the interior of the cylinder tube 77- above the piston assembly on piston rod -75- through two radial passages 96- and 97, passage 96- being formed near the upper end of passage .95- while passage 9'7-- is formed part way down the passage 95- and at an intermediate point along the latter. An oil relief pin. 98- is positioned in the passage 95- and is of slightly less diameter than the interior diameter of the passage -95- so as to permit the fiow of oil through passage -95 around the pin 98 to the radial passageways 96- and Q7, and at an-intermediate point along the pin -98 there is provided a reduced portion which may lie opposite the passage -97- for a purpose to be described.

A leak pin of the kind here illustrated is quite sensitive to dirt or strands of lint that may be contained in the lubricant, and in order to make the pin self-cleaning at each operation of the pump, the pin is loosely held in the outlet fitting f93- by means of a short round pin 99- passed through the lower end of the relief pin, and the outlet fitting 93 through which the relief pin extends is of sufiicient size so that there is always an oil passage by the relief pin permitting fiow of oil through the outlet fitting, past the relief pin, and the relief pin is loosely held between the shoulder in'the oil passage in fitting 93 and the top of the tubing connection fitting l0l-, the tubing fitting 10l being assembled in an oil tight manner by means of a gasket -102- and threaded portion, the relief pin may be installed and removed by. removing the, tubing connection l01-, the

ton rod 75- the piston in moving up and down passes over the exterior surface of the relief pin 98 and breaks up any dirt that may be forced into the clearance between the pin and the passageway 95-.

This dirt will be scraped off at the point where the pin enters the passageway in the piston rod and when the reduced portion of the pin passes this point, in the down travel of the piston, any dirt or lint that has been scraped off the pin will be carried into the reduced portion of the pin and when the piston descends this reduced portion of the pin will register with the radial passageway 97- and the oil flow around the pin and through the passageway -97- will carry the dirt back into the space above the piston assembly in cylinder tube '77 and then through a slot or oil passageway 10-5 in the side of cylinder tube -7l above the piston travel allowing the oil which has passed through the leak pin to return to the reservoir.

Altho the invention so far specifically described relates particularly to a combined pump and reservoir, yet in all cases this disclosed apparatus is considered to have a peculiar coaction in connection with a feed line or outlet tube which supplies lubricant to a plurality of metering devices communicating with the tube at points spaced diiierent distances along the tube from the pump outlet. In all cases, therefore, the applicant contemplates the connection of a tube -ll to the outlet fitting of'the pump and as shown in Figure i, tube 11 supplies lubricant to a plurality of metering devices, two of which are indicated as illustrative of the fact that a large number of such devices may be fed from a single tube, and altho the particular construction of the metering unit is not an essential. portion of this invention, the unit illustrated comprises a T-fitting -15() inserted in the outlet line or tube ll into which the upper end of a cylinder body member -15lis threaded.

This cylindrical member may as shownbe shouldered at an intermediate point to limit the downward movement of a piston 152- fitting loosely'in the cylindrical body 151- so as to permit lubricant to by-pass it, spring -'l53 acting to return the piston after each lubricantejecting movement as actuated by pressure in the supply line ll.

The lower end of the body 151- is chambered and the outlet from the cylindrical portion of the body is normally closed by ball valve s 154 under pressure of spring'l55 secured in any suitable way in the chamber. Screen 156 may be provided at the upper end of the body. As stated, this particular construction is not essential to the invention, but is shown as illustrative of a satisfactory metering unit for installation in the supply line ll.

Although I have shown and described specific structures as constituting embodiments of the invention, I do not desire to restrict myself to the details of form, construction or arrangement of the same, as various changes and modifications may be made Within the scope of the appended claims.

iting the movement of the relief pin.

I lf-t 1. A lubricating apparatus comprising ares;-

ervoir, a pump cylinder, ga -piston movable in said cylinder, a pistonrod for actuating thepiston, said piston vrod formed with an axial passageway and a radial passageway leading therefrom to the interior of the cylinder, a relief pin positioned in the axial passageway and of slightly less diameter than the interior diameter ofthe passageway, and having a portion of decreased cross-sectional area adapted to lie opposite the radial passageway. I 1 i 2. A lubricating apparatus comprisinga reservoir, a pump cylinder, a piston movable in said cylinder, a piston rod for actuating the piston, said pistonvrod formed with an axialpassageway and a radial passageway leading therefrom to the interiorof the cylinder,: a relief pin positioned in the axial passageway andof sli htly less diameter than the interior diameter of the passageway and having a portion of decreased cross-sectional area adapted to lie opposite the radial passageway, and means for limiting the axial movement of the relief pin.

3. In a lubricating apparatus, a cylinder, a piston movable therein, a piston rod for actuating the piston,-a tubular outlet fitting through which lubricant isforced from the cylinder, said piston rod having an axial passageway and a plurality of radial passageways leading from the axial pssageway to the interior of the cylinder and forming a constant means of communication between the cylinder and the outlet fitting,

radial passageways leading from the axial pas sageway to the interior of the cylinder and forming a constant means of communication between the cylinder and the outlet fitting, a relief pin in said axial passageway of slightly less diameter than the interior diameter of the passageway, and means in the outlet fitting for lim- 5. A lubricating apparatus comprising a reservoir, a pump cylinder arranged therein, an outlet fitting leading from the pump cylinder, a piston movable in the cylinder, and means for maintaining constant limited communication between the reservoir and the interior of the outlet fitting.

6. In an apparatus of the class described, a

combined reservoir and pump including a pump cylinder, a piston movable-in the cylinder, means permitting limited axial movement of said cylinder as actuated by movement of the piston, and means permitting a limited amount of fluid to pass through the piston to relieve the pressure in the system beyond the piston. I

7. In an apparatus of the class described, a reservoir, an outlet fitting leading from the reservoir and including a valve seat, an axially movable cylinder within the reservoir and having a portion adapted to contact with said valve seat, a piston movable within the cylinder and adapted to shift said cylinder axially to and from said valve seat, and means permitting a limited amount of fluid to pass through the piston to relieve the pressure in the system beyond the piston.- f v 8. In an'apparatus of the class described, a combined reservoir and pump including a pump cylinder having an annular flange atits lower end constitutinga valve face, an outlet fitting leading from thereservoir andhaving a valve seat of comparatively soft material for cooperaa tion with said valve face, means permitting lim-,- ited axial movement of said cylinder, a piston movable in the-cylinder, spring means for act uating thepiston in one direction, and a normally closed valve in said outlet fitting. 9.'In an apparatus of the class described, a combined reservoir and pump including a'pump cylinderhaving an annular flange at its lower end constituting a valve face, anoutlet fitting leading from the reservoir and having a valve seat of comparatively soft material for cooperation with the said valve face, means permitting limited axial movement of said cylinder, a piston movable in the cylinder, spring means for actuating the piston in one direction, and adjustable means for limiting the length of stroke of the piston.

10. A lubricating apparatus comprising a reservoir, a pump cylinder, a piston movable in said cylinder, a piston rod for actuating the piston, said piston rod formed with an axial passageway and a radial passageway leading therefrom to the interior of the cylinder, and a relief pin positioned in the axial passageway and of slightly less diameter than the interior diameter of the passageway.

11. A lubricating apparatus comprising a reservoir, a pump cylinder, a piston movable in said cylinder, a piston rod for actuating the piston, said piston rod formed with an axial passageway and a radial passageway leading therefrom to the interior of the cylinder, a relief pin positioned in the axial passageway and.

of slightly less diameter than the interior diameter of the passageway, and means for limiting the axial movement of the relief pin.

12. A lubricating apparatus comprising a reservoir, a cylinder within the reservoir, a piston movable in the cylinder, means for applying pressure to the piston to move the latter along the cylinder, a second cylinder having limited movement axially with respect to the first-named cylinder, a second piston movable in a second cylinder, and a piston rod connecting said pistons.

. 13. A lubricating apparatus comprising a reservoir, a cylinder within the reservoir, a piston movable in the cylinder, means for applying pressure to the piston to move the latter along the cylinder, a second cylinder having limited movement axially with respect to the firstnamed cylinder, asecond piston movablein a second cylinder, a piston rod connecting said pistons, an outlet fitting having a seat for the end of the second cylinder, and said second cylinder moved axially into and out of contact with said seat by frictional stress exercisedby the movement of the second piston.

14. A lubricating apparatus comprising a reservoir, a cylinder within the reservoir, a piston movable in the cylinder, means for applying pressure to the piston to move the latter along the cylinder, a second cylinder having limited movement axially with respect to the firstnamed'cylinder, a second piston movable in a second cylinder, a piston rod connecting said pistons, an axial passageway in said piston rod;

a radial passageway leading therefrom to the exterior of the piston rod and a lealrpin positioned in the axial passageway and being of slightly less diameter than the passageway.

15. A lubricating apparatus comprising a reservoir, a cylinder within the reservoir, a piston movable in the cylinder, means for applying pressure to the piston to move the latter along the'cylinder, a second cylinder having limited movement axially with respect to the firstnamed cylinder, a second piston movable'in a second cylinder, a piston rod connecting said pistons, an outlet fitting having a seat for the end of the second cylinder, and said second cylinder moved axially into and out of contact with said seat by frictional stress exercised by the movement of the second piston, an axial passageway in said piston rod, a radial passageway leading therefrom to the exterior of the piston rod, and a leak pin positioned in the axial passageway and being of slightly less diameter than the passageway.

16. A lubricating apparatus comprising a combined reservoir and pump including a pump cylinder arranged within the reservoir and having' an inturned annular flange at its lower end constituting a valve face, an outlet fitting connected to the reservoirand including a passage limited axial movement of said pump cylinder A simultaneously with piston movement.

FREDERICK H. GLEASON. V

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