US1402051A - Lubricating device - Google Patents

Description

' CfA. CAMPBELL.

LUBRICATING DEVICE.

APPLlcAnoN min JuNEzl, |921.

T5 6 mm @a n 9 n ww w 1/ AY S 5 0 d m Q g im 7 ,i \Pm,v 0. j/ A 0 l, 9 5

@A o @u -JMW L/ C. A. CAMPBELL. LumcAnNG DEVICE.

APPLICATION FILED JUNEl'Zr 192i.

'Patented Jan. 3,1922.

' 2 SHEETS-SHEET 2.

s n 6 a 8 5 3 2 i 2 .7 du av if-HEM.-

r M W d a o/l/JY we 1 2 i li z wmv l y w. a 4 w 2 6 2 o o mw M W 3 W ./fqv Q3 .Wn VW www KW f lTED STATES CHARLES A. CAMPBELL, OF WATERTOWN, NEW YORK.

LUBRICATING DEVICE.

Application filed .Tune 21, 1921.

To all whom t may concern:

Be it known that I, CHARLES A. CAMP- BELL, a citizen of the United States, residing at W'atertown, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Lubricating Devices, of which the following is a specification.

This invention relates to lubricating devices, and particularly to combined force and gravity feed lubricators for air compressors and other pumps and motors of the expansible chamber type.

The device operates to feedoil at each compressor piston stroke and derives the power to effect each oil-feeding operation from the pressure fluctuation accompanying such piston stroke. The lubricator thus operates only when the compressor or other connected device operates.

The mechanism includes an oil reservoir and a retarded, multiple-ported valve. This valve acts on a rise of compressor cylinder pressure to admit elastic pressure fluid over the oil in the reservoir, and then traps this pressure fluid. When cylinder pressure falls the valve moves back toward its initial position. In its travel .it momentarily opens an oil port, permitting the pressure liuid trapped over the oil to force a small quantity of oil into a delivery passage, and when the valve reaches its initial position the remaining trapped pressure. fluid is caused to blow this oil from the delivery passage into the compressor cylinder. This cycle is repeated for each cycle of the pump.

The invention also involves ,certain features of construction leading to ease of manufacture, fewness of parts. and certainty of function.

. In the drawings Fig. 1 is a vertical axial section Yof. the

complete lubricator with the combined reservoir and valve in its lowest position, the arrows showing the path and direction of air flow when pressure begins to rise inthe connected cylinder. i

Fig. 2 is a similar view showing the combined reservoir and valve at its upper limit ,of travel. It is in this position at the time of maximum vpressure in the connected cylinder.

Fig. 3 is a similar view showing the combined reservoir and valve moving downward, at the point when oil discharges from ,the reservoir to the side por-,t in the easing.

Specification of Letters Patent.

Patented Jan. 3, 1922. serial No. 479,333.

Fig. 4 shows the parts in the same position as Fig. 1, but the arrows show the fluid flow at the end of the cycle when pressure inthe connected cylinder is dying away and oil 1s owing from the lubricator to the cyl inder.

Fig. 5 is a half elevation and half section of the combined reservoir and valve;

Fig. 6 is a half elevation and half section of the ported liner in which the combined valve and reservoir is guided.

The device is housed in a hollow cvlindrical casing 11 open at its upperrendu and closed at its lower end except for thev threaded opening 12 `into which is screwed the nipple 13 having a choke port 14. The size of choke port 14C controls the rate of oil feed and I contemplate the use of interchangeable nipples 13v having different sizes of choke port. A union 15 is provided to connect nipple 13 to a pipe leading to the pump cylinder (not shown). This pipe conducts oil from the lubricator to the .cylinder and also transmits pressure fluctuations between the cylinder andlubricator.

The casing is connected to any suitable support by Studs or machine screws (not shown) threaded into the holes 16.

The open upper end of casing 11 is closed by a cap 17 having a central aperture, the cap being held in place by screws 13, and a gasket 19 being inserted to seal the joint. The cylinder is lined by a ported cylindrical bushing 2O which seats at its lower end o-n a gasket 21 and at its upper end against a portion of gasket 19. The bush-` ing 2O is thus in effect the same as if integral with casing 1l, but the use of a separate bushing simplifies the formation of the ports and the selection of materials.

T e bushing 2O is formed with an inwardly projecting stop-flange 22 at its lowerY end and with a side port 23 which connects air port 24 and oil port 25, both near the top of bushing 2O with a port 26 near the lower end of the bushing.

A cup-shaped member 27 which combines the functions of the oil reservoir, actuating piston and distributing valve is vertically slidable in bushing 20 between limits defined by its collision with iiange 22 and cap 17. The member 27 is open at its upper end and has. at its lower end a skirt 28 extending below partition 29 which serves as the bottom of oil reservoir 30.

Through the skirt 28 extend a series of lio ports 31 which lead to an annular groove 32. The port 26 registers with groove 32 in the lowermost position of member 27, is uncovered by member 27 in its uppermost position, and is blanlred in all other A(intermediate) positions of said members.

An oil port 33 entends from a point near the bottomof oil reservoir 30 to annular oil groove 34 near the upper end of member 27. Groove 34 is so positioned that it registers with oil port 25 of bushing 20 in an intermediate position of member 27 (see Fig. 3),7 port 25 and groove 34 being both blanked in all other positions (see Figs.1 and 2). Air port 24 is open in the lowermost position of member 27 and is blanlred in all other positions.`

The central aperture in cap 17 is closed by filling plug 35 which is threaded therein and seals against Vgasket 36. Plug 35 carries a guide rod 37 on which is slidably mounted the retarding sleeve 38. Complete separation of sleeve 38 and rod 37 is prevented by the pin and slot connection 39. Sleeve 38 is urged downward by coil spring 40 surrounding rod 37 and interposed between the flanged upper end of sleeve 38 and the lower face of plug 35.

lilith the parts assembled as shown in Fig.

1 spring 40 holds sleeve 38 against the up-y Y per face of partition 29 and thus acts continually to urge member 27 toward its lowermost position. Groove 41 in the lower end of sleeve 38 permits oil flow to and -from the interior of sleeve 38.

Assume that the lubricator is connected by a pipe to the cylinder of a compressor. At the end of the suction stroke the parts of the lubricator will be in the position shown in Fig. 1, and as the compression stroke commences air will flow through ports 31, 26, 23 and 24 to the space in the top of the lubricator above thek oil containedy in reservoir 30. During this How the retard spring 40 is holding member 27 down against the air pressure acting on the lower side of partition 29. Before the completion of theV compression strokeof the compressor, member 27 will shift to its uppermost position, the' spring 40 being overpowered by the efective upward pressure on partition 29.

In the position shown in Fig. 2 the oil in reservoir 30 is under elastic fluid pressure, ports 24 and 25 are both blanked, and port 23 is vented through port 26 which is cleared by skirt 28.

After pressure inthe compressor has begun to fall member 27 will start downward impelled partly by spring 40 and partly by the pressurwe Huid trapped above the oil.

In its -travel it passes through the position shown in Fig.` 3 in which positionport 26l is blanked and port 25 registers with groove 34. Since port 23 was vented in the uppermost position of member 27, the presand ports 31. Thence it is carried partly by gravity and partly by the air current to the compressor cylinder.

rThe cycle above described is repeated for each cycle oit' the compressor.

While I prefer to adjust the oil feeding action of theflubricator by changing the length or diameter (or both) of the choke port 14, the .adjustment can be made in other ways. The result can be accomplished by changing the number or size of ports 31, by

changing the size ofV port 8, or by changing the length or diameter of the pipe connecting the lubricator and pump cylinder. All these methods of adjustmenthave in common the idea of varying a throttling eiiect on pressure fluid surging between the compressor and pump, and in their broad aspects are equivalents.

What is claimed is 1. In a lubricator for cylinders, the combination of an oil reservoir; a ported casing; a ported piston mounted to reciprocate in said casing;,resilient means urging said piston in one direction; and a connection serving to cause pressure fluid Jfrom the lubricated cylinder to act against said piston in opposition tofsaid resilient means and move said piston in response to variationsot` pressure in the lubricated cylinder; the ports in said piston and casing coacting on an. initial rise in pressure to admit pressure iuid to `said reservoiron greater rise `oi' pressure to trap said pressure fluid in said reservoir, on fall of pressure to release a definite quantity of oil Jfrom said reservoir; and on further all of pressure to direct said trapped pressure fluid against said released quantityv of oil to expel the same from the lubricator.

2. In a lubricator for cylinders, the combination of an oil reservoir; a casing provided with an oil receiving passage andV ports connecting therewith; a ported piston mounted to reciprocate in said casing; resili-V ent means urging said piston in one direction; and a connectionserving to cause presisure Huid from the lubricated cylinder to act against said piston in oppositionto said resilient means, andmove said piston lin response to variation of pressure in the lubricated cylinder, the portsin said, piston and casing coacting on an initial rise in pressure to` admit` pressure liuld to said reservoir.y

on al greater-rise of pressurei to trap said pressure Huid in said reservoir andvent saidV oil receiving passage, on tall of pressure to,

release oil from said reservoir to said oil receiving passage, and on further fall of pressure to cut olf oil from said reservoir and direct said trapped pressure fluid into said oil receivin passage to expel the contained oil from t e lubricator.

3. In a lubricator for cylinders, the combination of a ported casing; a combined reservoir and ported piston mounted to reciprocate in said casing; a spring urging said piston in one direction; and a connection serving to cause pressure fluid from the lubricated cylinder to act against said piston in opposition to said spring and move said piston in response to variations of pressure in the lubricated cylinder, the ports in said piston and casing coacting on an initial rise of pressure to admit pressurevfluid to said reservoir, on greater rise of pressure to trap said pressure Huid in said reservoir, and on fall of pressure, rst to release a small quantity of oil Jfrom said reservoir and then on further fall of pressure to direct said trapped pressure fluid against said released oil to expel the same from the lubricator.

4.-. In a lubricator for cylinders, the combination of a ported casing; a cup-shaped ported piston open at its upper end, adapted to serve as an oil reservoir; and mounted to reciprocate in said casing; a spring urging said piston downward; a connection adapted to cause pressure fluid from the lubricated cylinder to act against the lower side of said piston to move the same in response to variations of pressure in the lubricated cylinder, the ports of said piston and casin coacting on an initial rise of pressure to a mit pressure Huid above said piston, on greater rise of pressure to trap said pressure fluid above said piston and on fall of pressure i'irst to discharge a small quantity of oil from said reservoir by the action of said trapped pressure fluid and then on further fall of pressure to cut off said discharge and direct said pressure Huid against said discharged oil and blow the same into said connection.

5. In a lubricator for cylinders, the combination of a ported casing; a cup-shaped piston open at its upper end, adapted to serve as an oil reservoir and having ports one of which is an oil port leading from near the bottom of the reservoir to a point above the oil level in said reservoir; a spring urging said piston downward; and a connection serving to cause pressure fluid from the lubricated cylinder to act against the lower face of said piston and move said piston in response to pressure variations in said cylinder, the ports in said piston and casing coacting on an initial rise in pressure to admit pressure Huid above said piston, upon continued rise in pressure to trap said pressure fluid above said piston, and upon fall of pressure first to permit oil to discharge from said oil port under the pressure of said trapped pressure lluid, and then to cut olf said discharge and release said trapped pressure fluid o-Ver said discharged oil to blow said oil from the lubricator into said connection. v

In testimony whereof I have signed my name to this specification.

CHARLES A. CAMPBELL.

Images