US1633471A - Disk valve for rock drills - Google Patents

Description

Juxfe 2l 1927.

, A. 1,633,471 l.. c. BAYLEs ET AL DIsx VALVE FOR nocx DRILLs Filed May 27. 1925 laten w/@M THE/HT ORNEV cooperating with the Patented .lune 21, 1927- UNITED STATES PATENT OFFICE..

LEWIS C. BAYLES AND FREI) M. SLATER, 0F EASTONQPENNSYLVANIA, ASSIGNORS TO INGERSOLL-RAND COMPANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

DISK VALVE FOR ROCK DRILLS.

Application ltiled Hay 27, 1925. Serial No. 33,118.

This invention relates to fluid actuated rock drills, but more particularly to an improved oscillating disk valve construction capable of ready and convenient application to a rock drill having automatic rotation for the drill steel.

The objects of the invention are to enable an oscillating dislr valvel to be located rearwardly of the cylinder and around the rifle bar of the rock drill, in Such location that the length of the drill is not. increased and no material weight is added to the drill.

The invention is illustrated in one of its preferred forms in the accompanying drawings,'in which- Figure l is a. longitudinal sectional elevation of a rock drill partly broken away showing the invention,

Figure 2 is a transverse sectional view -on the line 2-2 of Figure l looking upwardly in the direction of the arrows, the ports Y and Z underneath the valve being shown in dot and dash lines to indicate their shape and to show that they are in front of the section taken and are present in the construction but are not actually seen in Figure 2, and

Figure 3 is a detail transverse sectional view through the valve.

y Referring to the drawings, the cylinder A is provided with the reciprocating piston'B having the forward extension C extending through the front head washer D. The piston is provided with the usual rifle nut E rifle bar F for imparting rotation to the drill steel, which, together with the front head and chuck parts are not shown for purposes of simplicity. The usual water tube G extends through the rifle bar and piston, and the rifle bar is provided with the rotation ratchet H in the ratchet ring J located in the block K. Located between the block K and the cylinder head block L is a valve box preferably in two sections, comprising the ringO and the cover piece P, having a shallow recess between them within which recess the valve Q, is arranged. The back head R of the rock drill is of the usual construction and rovided with the throttle valve S control ing the supply of pressure fluid to the machine. A sleeve T is preferably arran d overv the rifle "bar, and as shown, the va ve Q has ahollow central portion or bore U encircling the rifle bar and sleeve T. This sleeve T is held wholly within the head block L and cover piece P and centers the cover piece.

the valve to oscillate freely and also permit pressure fluid to low over the periphery of the valve. The valve is guided in any suitable manner as by means of the pins WV extending into sockets Xin the valve in which suiiieient clearance is provided to permit oscillation. The cover piece P is provided with an annular flange P concentric with the sleeve T and forming a stop for the valve. The cylinder head block L is provided with the inlet ports Y and Z controlled only by the valve, and the cylinder is provided with the free exhaust port a controlled only by the piston.' A supply passage b connects the inlet port Z with the inlet port c at the forward end of the cylinder and the inlet port Y communicates directly with the rearward end of the cylinder. An inlet port d permits live pressure fluid to pass from the throttle valve S to the. valve chest.

In the `operation of the device, assumingr that the piston B is moving rearwardly as indicated in Figure 1, the valve will be in the position aS indicated and live pressure fluid is being admitted to the forward end of the cylinder. After the piston has passed beyond and uncovered the exhaust port a in the cylinder, the pressure in the forward end of the cylinder and underneath one end of the valve will have fallen or dropped while the opposite end of the valve is subjected to compression taking place in the rearward end of the cylinder, which will cause the valve to oscillate and close the inlet ort Z and o en the other inlet port Y to 51e rear end 0E the c linder which will drive the piston forward y.

The construction is simple, consumes a small amount of space, and permits a "['lat diskv valve to be located around the rifle bar so that `there are no protuberances on the exterior of the cylinder. While the construction may be applied to any type of rock drill, the application is obvio-usly particularly suitable for a stope drill.

Te claim:

l. A fluid actuated rock drill comprising a cylinder and reciprocating piston, automatic rotation means for the drill steel including a riile bar, a head block having a valve seat port-ion, a valve box at the 'rear of the cylinder havinof a shallow recess forming a valve chamber, said valve box being provided with an annular flange forming a valve stop, and a fluid distributing plate valve in said shallow recess in the form of a thin ilat oscillating plate encircling the riile bar, the valve being uniformly tapered from its median diameter towards the periphery at each side'and bearing on the seat portion of the headpiece along said diameter to form a fulcrum. y

2. A fluid actuated rock drill comprising .a cylinder and reciprocating piston. automatic rotation means for the drill steel including a rifle bar, a free exhaust port located centrally of the cylinder and controlled only by the piston, a valve box having a shallow circular bore forming a valve chamber located rearwardly of thecylinder and in line there-with, said valve box being provided with an annular flange formin a valve stop, a plate valve in the form o a thin flat oscillating circular disk in the said valve box recess and encircling the riflev valve seat portion, a valve box at the rearl of the cylinder having a shallow recess frm,

ing a valve chamber, said valve box being provided with an'annular flange forming a valve stop, a sleeve around the rifle bar, said sleeve being held wholly Within the head block and valve box and acting to center the valve box, and a fluid distributing plate valve in said valve box recessin the form of a thin lat oscillating disk encircling said sleeve, the fulcrum of said valve bearincr directly onsaid valve seat portion of the head piece. v

In testimony whereof we have signed this specification.

LEWIS c. BAYLES. FRED M. sLArER.

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