US1905455A - Compressor - Google Patents

Description

April 25, 1933.

D. F. FESLER COMPRESSOR Original Filed Nov. 16 1921 Patented Apr. 25, 1933 DOUGLAS F. FESLER, OF EVANSTON, ILLINOIS, ASSIGNOR TO ALEMITE CORPORATION, OF

CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE COMPRESSOR Application filed November 16, 1921, Serial No. 515,460. Renewed July 7, 1930.

My invention relates to improvements in compressors, and is particularly concerned with the provison of a novel compressor adapted to form a part of a well-known lubricating system, comprising a plurality of fittings or nipples to be secured to the various bearings on the machine to be lubricated, and a compressor for supplying lubricant to the fittings, the compressor comprising a discharge conduit having a coupling for successively making sealed connections with said fittings.

The objects of my present invention are First: To provide a compressor by means of which lubricant under exceedingly high pressure can be easily delivered to the littings;

Second: To provide a compressor of the character described comprising means for rapidly forcing a comparatively large amount of lubricant into a bearing, where the resistance of the bearing is small, but which, at the same time, embodies means for supplying lubricant to the bearings under high pressure where such high pressure 1s necessary for forcing the lubricant between the surfaces to be lubricated;

Third: To provide a compressor having a discharge conduit which comprises a sealing member and a valve co-acting in a novel manner, and

Fourth: To provide a construction of the character specified which is simple, economical to manufacture, rugged and easy to opcrate.

Other objects will appear as this descrip- Vtion progresses, reference being had to the accompanying drawing, in which Figure 1 shows my improved compressor in side elevation, and Y Figure 2 is a central longitudinal section through the discharge conduit forming apart of my compressor.

In both views, similar reference characters will be used for referring to similar parts.

Y Referring to the drawing, my improved compressor comprises a low pressure cylinder or barrel 5, one end of which is closed by a sui-table'cap 6, which can be removed for the purposes of filling the compressor. A screw 'threaded plunger rod 7 is threaded through I the closed end 11 of the low pressure cylinder. rlhe construction thus far disclosed is well-known to those skilled in this art, and is purely conventional in character and forms no part of my present invention except as it co-acts with the remaining elements about j to be described.

The discharge conduit of my improved compressor comprises a guide tube 12, one end of which is reduced in cross-section and threaded as shown at 13, so that it can be connected with the internally threaded nipple 10. Adjacent lits inner end, the guide tube 12 is internally threaded as shown at 15 to receive the externally and internally threaded collar 16. The inner end of the plunger tube 17 is threaded into the bore of the collar 16, so as to support the plunger tube 17 in spaced relation to the walls of the .guide tube 12. The inner end of the high pressure tube or cylinder 18 is slidably mounted in the outer end of the guide tube 12, and surrounds the plunger tube 17, as shown in Figure 2. To provide a tight joint between the end of the tuber18 and the plunger tube 17, I provide suitable packing 19, and a. follower 20, the outer end of which is provided with slots 21 for receiving a Spanner wrench. Preferably, theV outer end of the plunger tube 17 is provided with a collar or enlargement 22, which co-acts with the shoulder 23 atthe inner end of the tube 18 to limit the outward movement of the tube 18 with respect to the guide tube 12. v

A sleeve 211 is threaded upon the outer end of the high pressure tube or cylinder 18. The outer endof thebore of the sleeveis contracted toprovide a seat 25 for the flexible gasket or'cup leather 26. A` valve 27 seats 95 The helicalspring 30 positioned between the out-er end of the tube 18, and the valve 27 yieldingly holds the latter upon its seat.

I also provide means at the inner end of the discharge conduit for preventing the high pressure developed in the high pressure cylinder or tube 18 from being transmitted to the low pressure cylinder, this means comprising a check valve 31, the inner face of which is provided with a projecting member 32, which, when the valve 'is seated, extends through the opening in the gasket 33. A helical spring 34 yieldingly holds valve 31 upon its seat. The outer face of the valve 31 is provided with a projection 35 for keeping kthe adjacent endvof the spring centered upon the valve. i

Although it is not necessary for the successful operation of my improved compressor, the outer end of the sleeve .24 may, if desired, be provided with bayonet slots 36 for receiving the projecting ends of the pin 37, forming a part of the nipple or fitting 38, so as'to make av locked attachment to the fitting. The fitting 38 is of the usual wellknown type comprising a non-return valve 40,

and a spring 41, seated between it and the 'pin ,37 for yieldingly holding the closure 40 in its closed position.

vIn using my yimproved compressor, the

l outer end of the sleeve 24 is placed over and around the outer end of the nipple 38, as shown in Figure l, and the operator then .rotates the plunger rod 7 by means of a fhandle 9, thereby causing the plunger 8 to move inwardly in the low pressurelbarrel or cylinder 5, thus forcing lubricant past the valve V31 into the chamber between the end .of the guide tube 12 and the inner end of the plunger tube 17, and from thence through the plunger tube into the high pressure cylinder 18. From the high pressure cylinder 18, the lubricant iiows past the valve 27 (which has been raised by the engagement of its stem 28 with the closure 40) and into the fitting 38 and from thence to the bearing. If the re- ,y sistance to the passage of lubricant into the bearing is so great as to make the turning of the handle 9 difcult, the operator simply pushes upon the handle 9, or the barrel 5, or both,in the direction of the axis ofthe discharge conduit, whereupon the plunger tube 17 will be forced into the high pressure cylinder or tube 18, and displace lubricant therefromv past the valve 27 through the tting and into the bearing.' It will be noted that the diameter ofthe plunger tube 17 is comparal'tively small, so that pressures of aV thousand pounds or more per square inch can easily be developed in the high pressure cylinder 18.

In Vmaking an attachment or connection with a fitting 38, the outer end of the valve stem 28 iirstmakes contact with the closure 40, and because of the greater tension of the spring 30, it causes the closure 40 to open against the tension of the spring 41. The

closure 40, however, has a limited movement, and when it reaches the end of this movement it acts as an abutment for the valve stem 28, so that upon further movement of the sleeve 24 toward the fitting 38 this valve is lifted from its seat upon the gasket 26 but immediately thereafter the gasket 26 comes into contact with the end of the fitting 38 and makes a sealed connection with this iitting. When the plungerin the barrel 5 is operated to force lubricant into the discharge conduit, under pressure, the pressure of the lubricant upon the inner face of the gasket 26 causes it to be forced tightly against the end of the fitting 38 and the greater the pressure, the better the seal between these two members so that there is no opportunity for lubricant to escape through the joint.

After the three members 12, 17 and 18 have been telescoped within each other by exertion of pressure upon the handle of barrel, to return them to their former position it is merely necessary toremove the sleeve 24 from the fitting and turn the handle 9 throughy a ycouple ofV rotations, whereupon the pressure of the lubricant against the valve 26 will cause t-he high pressure cylinder to move outwardly to the position shown in Figure 2.

" While I have described the details ofcon-vA thus described my invention, what cylinder having a Vdischarge conduit comprising, a guide tube communicating with said low pressure cylinder, a plunger tube mounted within said guide tube, and communicating with the interior thereof, the outer end of said plunger tube being freely supported.

in spaced relation to the walls of said guide tube, a high pressure cylinder surrounding the free end of said plunger tube and slidable between said plunger tubeand said guide tube, an outwardly opening check valve be# tween said high pressure cylinder and said low pressure cylinder, means. for limiting the movement of. said high pressure cylinder relative to said plunger tube, and a coupling member carried by the free end of said high pressure cylinder, y

2. A compressor comprising a low pressure cylinder having a discharge conduit including a guidel tube connnunicating with said low pressure cylinder, a plunger'mounted within said guide tube, said plunger having a lubricant passageway the outer end of said plungertube being freely supported in spaced relation to the walls of said guide tube, a high pressure cylinder surrounding the free end of said plunger and slidable between said plunger and said guide tube, means for limiting the movement of said high pressure cylinder relative to said plunger, and a cou pling member carried by the free end of said high pressure cylinder.

3. A lubricant compressor comprising a barrel, compressing means comprising cylinder and plunger elements having relative telescoping movement for receiving lubricant from said barrel and ejecting lubricant under pressure, and separate cylindrical guide means rigid With said barrel for guiding the movement of one of said elements.

4. A lubricant compressor comprising a barrel, compressing means comprising cylinder and plunger elements having relative telescoping movement for receiving lubricant from said barrel and ejecting said lubricant under pressure, and a guide sleeve movable With one of said elements and telescopable with the other of said elements.

5. A lubricant compressor comprising a barrel, means for discharging lubricant from said barrel, compressing means comprising cylinder and plunger elements having relative telescopic movement for receiving lubricant from said barrel and ejecting lubricant under pressure, valve means interposed between said barrel and said compressing means, BO'and guide means rigid With said barrel for guiding the movement of one of said elements.

In witness whereof, I hereuntosubscribe my name this 9th day of November, 1921.

DOUGLAS F. FESLER.

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