US1558221A - Lubricator for rock drills - Google Patents

Description

Oct. 20, 1925- 1,5 ,2

' L. C. BAYLES ET AL LUBRICATOR FOR ROCK DRILLS Filed Aug. 12 1924 THEIR ATTRN Y v Patented Oct. 20, 1925;

UNITED s A'nz;s

PATENT OFFICE.

LEWIS c. BAYLESAND FRED m. smrnngor EASTON, PENNSYLVANIA, 'ASSIGNQBS 'ro memtsotnmn COMPANY, or JERSEY crrv, NEW JERSEY,-A- conromrrron or NEW JERSEY.

nuniuca'ron on noox DRILLS.

i mflm'm August 12, 1924f Serial No. 731,540. b

To all whom it may con cm: Be it known. that we, LEWISVC;. BAYLES and FRED M. SLATER, citizens of the United:

States, and.residents of Easton, county of Northampton, and State 'of Pennsylvania,

have invented, acertain Lubricator for Rock.

valve. The plunger which is adapted to operate in the feedcylinder is usually pro vided with packing or cup leathersto effect a fluid-tight condition in the cylinder. In ordinary. use, the plunger is subjected to constant vibration due to the hammering.

of the hammer piston against the drill which causes excessive wear on the packing or cup leathers unless lubricant, such as oil, is supplied frequently thereto.-

It is an object of this invention to supply lubrication in sufiicient quantity to the cup leathers or packingrin the feed cylinder to maintain them in. good condition.

It is a further object'of this invention to supply lubricant from a common oil supply chamber which is provided for the accom-" .modation of oil to be used for lubricating the hammer piston end of the rock drill and at the same time preventing communication between the air feed cylinder and the hammer cylinder. A device of this kind is-desirable for the reason'that if more than one oiling chamber is provided in the rock drill, the operator is apt to neglect to fill all of the chambers and the machine suffers from lack of lubrication.

Other objects and advantagesof the invention will be in part obvious'and in part pointed out hereinafter. I

The drawing illustrates one embodiment which the invention may assume in practice and includes- Figure 1, a side view of a stope drill equipped with a lubricator constructed in accordance with the practice of the invention, parts being broken away to show the interior construction of the lubricator and the parts to which it is adapted to supply oil,and a I q Figure 2, an enlarged longitudinal section of part of the stope drillshowing the lubri-g cator in one of its operative positions.

Referring to the drawing, the invention is illustrated in its application to a stope drill having a hammer cylinder A and an air feed cylinder '13 'oin'edin any suitable manner at a feed cylinder flange C. "A hammer piston Dis adapted to reciprocate within the hammer cylinder A to deliver blows to a drill steel E inserted in the front head F.

The drill-steel E'i's heldagainst the 'work by air under pressure introduced into the air cylinder B against a piston G provided with a suitable tail point (not shown). In

order to prevent leakage from the feed cyl inder B around the piston G there is pro vided suitable packing, as for instance, the

cup leathers H.

In order to kee the cup leathers H soft and in good con ition to maintain. an air tightjoint in the cylinder B, it has been found desirable to inject small quantities of oil to the interior of the cylinder B. It has been found unsatisfactory to leave the lubrication of the feed cylinder tothe judgment of the operator as either too much oil or not enough is adapted to be supplied,

causing the leathers to deteriorate or wear out rapidly. Lubrication being necessary for the proper operation of the hammer piston as well as the air feed cylinder, it is proposed by this invention to employ a single oil reservoir J to su ply lubricant to all of these parts. ,One di culty in such an arrangement is that the air pressures existin in the hammer cylinder and feed cylin er are not equal at all times and therefore, communication with the oil reservoir from both cylinders cannot be had at the same time without leakage of air from the feed cylinder B to the hammer cylinder A which wou'ldresult in carrying oil from one to the other of t 1e cylinders in excess amounts. To this nd a lubricating device is provided which is adapted to receive a small quantity of oil from the reservoir J and to receive and entrap and thereupon tBo discharge the oil into the feed cylinder In the preferred embodiment of the invention, the, lubricating device includes a casingK which is adaptedto fit into a bore L in the'back head O'of the cylinder A,

preferably in the form of a cylindrical bushthe ing having an inlet P by which oil passing from the reservoir J by gravity or air pressure may find its way through the passage Q into the interior of the casing K. An outlet R through the casing K, longitudinally spaced from the inlet P, is adapted to permit the oil from the interior of the casing to flow down through the groove S into the feed cylinder B. .lVithin the casing K a plunger T is adapted to be actuated by air admitted under the plunger T from the air feed cylinder B through a passage U. The plunger T is hollow having a bore V within which a piston is arranged to slide, the piston being held centrally between the upper end of the casing K and the bottom of the bore V by resilient means, such as the coil springs Y and Z. the latter spring being above the piston V.

Oil is adapted to be admitted to the bore V from the inlet P through ports I) which, when the plunger is in an upward position, also allow. the oil to escape from the bore V into the outlet R. Oil in the interior of the casing K above the piston is permitted to escape into the passage Q through a relatively small port a and thence back to the reservoir J.

The operation of the pump is as follows z-lVhen air is admitted into the feed cylinder B, it finds its way through the passage U to the under-face of the plunger T which rises against the compression of the springs Y and Z so as to close the inlet P entrapping the small quantity ofoil under piston WV within the plunger T. Since the oil'is relatively uncompressible, the lower coil spring Y is not materially compressed while the upper coil spring Z exerts a force tending to force the oil out of the plunger. There is no outlet however for the oil thus entrapped until the plunger T rises to a point at which the ports I) register with the outlet R. Thereupon a small quantity of oil within the plunger T escapes through the outlet B into the cylinder B as shown in Figure 2. The plunger T remains in this position while the air pressure within the feed cylinder B is maintained. Upon re duction of the air pressure the plunger T moves downwardly to its normal position as shown in Figure 1 due to the compression of springs Y and Z, whereupon oil again is admitted to the interiorof the plunger T by gravity and by suction due to the action of the spring Y against the piston W.

It will be noted that at no time is there communication between the feed cylinderB and the hammer cylinder A, although oil is also supplied from the reservoir J to the interior of the hammer cylinder A. The air ,actuating'the hammer piston D is continuously pulsating and therefore is pumped into and out of the reservoir J through the passage (Z connecting the hammer cylinder A with the reservoir. The circulation of air into and out of the reservoir J causes a slight amount of oil to be carried into the hammer cylinder A for lubricating the parts associated therewith.

If desired, the drill may be of the automatic rotating type and to this end there -may be provided a ratchet e cooperating with the ratchet ring f and having a fluted rifle bar 9 engaging the rifle nut 72. in the piston D. The drill may also be provided with a water supply tube extending from a water head in in the back head 0 through the hammer piston D into the front head F to feed cleansing water to the hollow drill steel E. The handle 0 is provided for guiding the drill and for resisting its rotation. A throttle valve of any suitable type may be provided. Preferably, the throttle valve is adapted to supply air under pressure simultaneously to the hammer cylinder A and the feed cylinder B, the port q cooperating with a port 1- for admitting compressed air to the feed cylinder only being shown.

The cup leathers H are clamped to the feed piston G by a suitable bolt 8 having a spacer t to receive a loosely fitting retaining spring a which cooperates with a bushing o rigidly held in the upper end of the feed cylinder B to hold the piston G in its retracted position for convenience in transporting the tool.

- lVe claim 1. A rock drill comprising a hammer cylinder, an air feed cylinder, a reservoir adapted to supply oil to both of said cylin ders, a lubricating device including a casing having an oil inlet from said reservoir and an outlet to the feed cylinder, a hollow plunger within said casing adapted to be actuated by air from the feed cylinder to receive oil from said inlet, and a piston within said plunger to discharge the oil from said plunger through said easing into the feed.

cylinder.

2. A rock drill comprising a hammer cylinder, an air feed cylinder, a reservoir adapted to supply oil to both of said cylinders, a lubricating device including a casing having an oil inletfrom said reservoir and an outlet to the feed cylinder, a hollow plunger within said casing adapted to be actuated by air from the feed cyhnder to rereceive oil from said inlet, and a spring pressed piston within said plunger to discharge the oil from said plunger through said easing into the feed cylinder.

3. A rock drill comprising a hammer cylinder, an air feed cylinder, a reservoir adapted to supply oil'to both of said cylinders-and a lubricating device. including a casing provided with an oil inlet and an oil lhe easing into the machine,

cylinder and a-spring pressed piston within said plunger, said plunger and piston being adapted to trapoil Within the plunger upon actuation by air pressure and to eject said oil into the feed cylinder.

i. A lubricator for fluid actuated machines comprising a reservoir, a casing having an oil inlet from said reservoir and an outlet to the machine, a hollow plunger within the casing adapted to be actuated by air under pressure to receive oil from said inlet, and a piston withinthe plunger to discharge the oil'f-rom the plunger through 5. A lubricatoi' for fluid actuated machines comprising a reservoir, a casing havthe plunger through the casing into the machine. p

6. A lubricator for fluid actuated machines comprising a reservoir adapted to contain oil for the machine, and an automatic lubricating device associated With in said casing adapted to be actuated by air under pressure, and a spring pressed piston Within said plunger, said plunger and piston being adapted to trap oil within the plunger upon actuation by air pressure and to eject said oil into the machine.

In testimony whereof we have signed this specification.

LEWIS 0. names. FRED M. SLATER.

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