GB112877A - Improvements in or relating to Drill Sharpening Machines. - Google Patents

Abstract

112,877. Jackson, W. J. Mellersh-, (Leyner Engineering Works Co., .J. G.). April 19,1917. Forging and sharpening rock drills; dies. - Relates to drill-sharpeners of the type described in Specification 22615/13 in which the drill is held during sharpening between an anvil 4, Fig. 1, and a movable jaw 7 operated through posts 6 by a piston 5 moving in a cylinder formed in the base. The improvements consist in cushioning means, in forming the fluid-pressure passages in the base, in supplying clearing fluid to the face of the movable jaw, and in means for clearing the bore of a hollow drill. The jaw is raised by the fluid-pressure on a reduced extension 8 of the piston 5, and the downward stroke of the jaw is cushioned by means of a check valve 9 inserted in the supply pipe 15 of the piston 8. The distributing valve 12 for the pistons 5 and 8 is operated by a hand-lever 13 which also operates an auxiliary valve 17 supplying fluid through passages 18 to the face of the jaw 7. The passages 18 in the anvil 4 and in the post 6 are arranged to register only when the jaw is in its highest position. A hollow drill after being sharpened by the dolly 19, Fig. 3, is cleared by a pin 22 carried by a piston 21 moving in a cylinder 20, the fluid supply to which is controlled by a valve operated through links by a hand-lever 32. The pin 22 is inserted in a sleeve 24 secured to the piston 21 and is held in place by a distance-piece 29 and a cap 30. The jaw 7 and the anvil 4 are formed with extensions 35, 34, Figs. 1 and 8, and, during clearing, a drill is held between a notched plate 36 secured to the jaw 35 and a block 38 in the base 34. The block 38 is adjustable by means of a wedge 40 formed with teeth gearing with a toothed spindle 42 turned by a lever 43. The latter is secured by a spring pin engaging holes in a disk 46.