GB233919A - Fluid actuated machine for enlarging the bores of rock drills and the like - Google Patents

Abstract

233,919. Marks, E. C. R., (Ingersoll- Rand Co.). July 3, 1924. Forging and sharpening rock drills; perforating by forging.-A device for piercing or clearing the bores of rock drills &c. as described in Specification 199,392, has a punch o, Fig. 4, actuated by a fluid-operated hammer-piston S striking one of two blocks a, c according as the punch is to be driven in or withdrawn, the device being fed towards or from the work-holding clamp g, Fig. 1, by fluid-operated means. The tool o is mounted in the block a which is connected by a cross-head b, bolts f, and cross-head d to the block c, these blocks &c. being free to move a small distance relative to the hammer cylinder P so that when this is fed towards the work the hammer S strikes the block a only, and when away from it the block c only. The control valve r, Fig. 4, is operated by a handle x, Fig. 1, and link 2 to admit fluid to the hammer cylinder and also a space u, Fig. 4, in front of a fixed piston p<1> so that the cylinder Q and hammering device carried by it advances along a guide L, Fig. 1. When the operation is completed the handle x is released and returned by a spring, causing fluid to be admitted to the space v and exhausted from the space u so that the device is withdrawn, while the supply of fluid to the hammer cylinder is not altered. This movement of the device brings the link 2 against a stop 10 which moves the valve into an intermediate position in which all fluid is cut off and movement ceases. The clamp g can be moved, by means of a bolt and slot k, into two different positions to suit drills or drill shanks. The device is shown mounted on a drill-sharpening machine F.