US1592855A - Valve for rock drills - Google Patents

Description

July 20 1926. 1,592,855

G. W. HULSHIZER VALVE FOR ROCK DRILLS Filed June 20, 1925 INVENTOR .B A U Georg/e m r/513%? W HIS ATT NEY Patented July 20, 1926.

UNITED STAT ES PATENT QFFICE.

GEORGE W. HULSHIZEB, 0F STEWARTSVILLE, NEW JERSEY, ASSIGNOR TO INGERSOLL- RAND COMPANY, 01' JERSEY CITY, NEW JERSEY, A CORPORATION 01 NEW JERSEY.

VALVE FOB 360K 133E148.

Application filed June 20, 1825. Serial No. 38,442.

This invention relates to fluid actuated rock drills, but more particularly to a spool type distributing valve for rock drills of the hammer type.

One object of the invention is to enable a rock drill to be equipped with a valve so constructed as to prevent centering of.

said valve.

Another object is to produce a valve f the spool type which is quick and sensitive in operation and positive in its action.

Other objects will be in part obvious and in art pointed out hereinafter.

he invention consists of the combinations of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter' described and more particularly pointed out in the. appended claims and illustrated in the accompanying drawing, in which- 7 Figure 1 is a longitudinal view in eleva tion and partly in section of so much of a rock drill as will serve to illustrate the invention,

Fi are 2is a view similar to Figure 1 and in w rich the reciprocatory parts are shown in another position.

Referring to the drawing, the invention is shown embodied in a rock drill having a cylinder A in which is arranged a reciprocatory piston B for deliverin blows on a drill steel (not shown). A :ront cylinder washer C is disposed within the front end of the cylinder A and has a bore D to receive slidably a fluted forward extension E of the piston 13. The back end of the cylinder A is sealed by a back cylinder washer F which also serves to centralizea back head arranged at the back end of the cylinder A. Any. suitable means may be provided tor securing the back head G to the cylinder A, but such means preferably consist of side rods or bolts (not shown) arranged on opposits sides of the drill.

Rotary motion of the piston B is in this instance accomplished by a rifle bar, H which engages the piston B in the usual manner. A ratchet head J preferably formed integral with the rifle bar H carries a plurality of spring actuated pawls K. The anda K are so arranged that they will pass freely over teeth L formed in a ratchet chest Q comprising a bottom plate It and a top late or cap S. A throttle valve T, referab y arranged within the ca S o the valve chest Q, controls the a pressure fluid to the machine. The pressure fluid is exhausted from the cylinder A through a free exhaust port U preferably formed in the cylinder intermediate its ends and is controlled by the piston 33.

In accordance with the present invention, a pressure chamber V is formed in the cap S and a similar chamber W is formed in the plate R to receive a distributing valve X. The valve X is of the spool type and has a central flange Y extending at its periphe into an annular supply chamber Z whic communicates with the throttle valve T through passages R and S formed in the plate and the cap S respectively. In this instance sides I) and c of the flange constitute actuating and holding faces against which pressure fluid may act for throwing the valve and for holding it in thrown position. In addition to serving as actuating and holding faces, the faces 5 and 0 also control the admission of pressure fluid to the rear and front ends of the cylinder through supply passages'd and e respectively.

In order to facilitate throwing of the valve in one direction, a passage 7 is formed from the forward end of the cylinder A to the chamber W for admitting pressure fluid from the cylinder into said chamber to act against a face 9 for augmenting the pressure fluid acting against the face E) of the flange Y for throwing the valve and holding it in thrown position. A similar pas- 'ssion of sage 71, rovides communication between the rear on of the cylinder A and the chamber V for admitting pressure fluid into said chamber to act against a face 9' at the other end oi'the valve for augmenting the ressure fluid acting against the face 0 o the flange Y for throwing the valve to its opposite position and for holding the valve in thrown position.

In order to further facilitate the throwing of the valve, a plurality of small passages 7c are formed through the flange Y to communicate at their ends with annular passages o and p formed in the cap S and the plate R res ectivelyto encircle the pressure chambers R and W. In this instance, passages q and 7' leading from the chambers V and W respectively to the atmosphere are formed in the valve chest to prevent the forming of a cushion while the valve is be-' ing thrown.

In the operation of the device, with the parts shown in the osition in Figure l, pressure fluid flowing om the throttle valve T into the annular chamber Z will pass over the face 0 of the valve X and thence into the annular passage 0 and through the supply passage e into the front end of the cylinder ,and drive the piston B rearwardly. During the rearward travel of the piston B, the passage f will be uncovered and permit a portion of the pressure fluid to flow therethrough into the chamber W to augment the pressure acting against that part of the face I) of the valve X which extends into the annular groove Z for throwing the valve. After the piston B covers the exhaust port U and while the valve is still in thelposition shown in Figure 1, the pressure flui leaking through the passages is will flow into the rearward end of the cylinder A. In this way equal pressures are obtained on opposite sides of the flange Y. Such e ualization of pressures on op osite sides 0 the flan e will cause the va ve to move to a neutra position. As the piston continues rearwardly the pressure fluid acting against the face 6 of the flange Y, assisted by the compression formed in the rear end of the c linder after the passage h is covered by the piston will act against the face I) and throw the valve to the position shown in Figure 2. In this position of the valve, pressure fluid will flow across the face of the valve into the annular passa p thence through the suppl port 4 into t e rearward end of the cylindzzr and drive the piston forwardly.

As the piston advances on its forward stroke, the passage k is uncovered and pressure fluid is admitted into the chamber V to act against the face of the valve.- At the same time, pressure fluid will leak through the passages into the annular passage 0 and, as during the rearward stroke of the piston, augments the compression formed in the front end of the cylinder to act against the face 0 of the flange Y for throwing the valve in the opposite direction, thus completing the cycle of operations.

The advantages of this invention reside in the fact that a valve constructed in this manner requires only a slight travel to sup ply pressure fluid in sufiicient quantities to the cylinder. Another desirable advantage is that the valve is quick and positive 1n action.

I claim:

1. In a fluid actuated rock drill, the combination of a cylinder with a reciprocatory piston, a valve chest having pressure chambers, annular chambers encircling the pressure chambers, a valve located in the pressure chambers and annular chambers, actuating and holdin faces at each end of the valve, a central ange on the valve to control the admission of pressure fluid from a source of supply to the annular chambers, and supply passages affording communication between the annular chambers and the ends of the cylinder for conveying pressure fluid to the cylinder.

2. In a fluid actuated rock drill, the combination of a cylinder with a reciprocatory iston, a valve chest having pressure chamers, annular chambers encircling the pressure chambers, a valve located in the pressure chambers and annular chambers, actuating and holding faces ateach end of the valve, a single flange on the valve to control the admission of pressure fluid from asource of supply to the annular chambers, actuating and holding faces on each side of the flange against which pressure fluid may act for throwing the valve and holding it in thrown position, and supply passages affording communication between the annular chambers and the ends of the cylinder for conveying pressure fluid to the c linder.

3. In a fluid actuated rock drill, the combination of a cylinder with a reciprocatory piston; 91 valve chest having pressure chamers, annular chambers enclrcling the pressure chambers, a valve located in the pressure chambers and annular chambers, actuating and holding faces at each end of the valve, a single flange on the valve to control the admission of pressure fluid from a source of supply to the annular chambers, actuating and holding faces on each side of the flange, passages through the flange to rovide communication between the annuar chambers, and supply passa es leading from the annular chambers to t e cylinder for conveying pressure fluid to the c linder.

4. In a fluid actuated rock drill, t e combination of a cylinder with a reciprocatory iston, a valve chest having pressure chamrs, annular chambers enclrcling the pressure chambers, a valve located in the pressure chambers and annular chambers, actuating and holding faces at each end of the valve, a sin 1e flange on the valve to control the admission of pressure fluid from a source of supply to the annular chambers, actuatin an olding faces on each side of the ange, passages through the flange for .the admission of pressure fluid therethrough to equalize the pressure on both assages leading from the pressure chamsides of the flange, supply passages leading ers to the atmosphere to prevent cushionfrom the annular chambers to the ends of in in that chamber toward which the valve 10 the cylinder, passages controlled only by the is eing thrown.

piston for conveying pressure to the pres- In testimony whereof I have signed this sure chambers to facilitate reciprocation of specification. the valve and for holding the valve, and GEORGE W. HULSHIZER.

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