GB731528A - Improvements in or relating to drilling machines - Google Patents

Abstract

731,528. Percussive drills. PITTSBURGH CONSOLIDATION COAL CO. June 14, 1951 [June 22, 1950], No. 14100/51. Class 124. [Also in Group XXII] A drilling-machine comprises a supporting frame forming a longitudinal guideway, a sliding frame mounted in the guideway of the supporting frame and forming a second guideway in which a drill is mounted, an abutment at the front of the sliding frame to engage the rock face being drilled, motor connections between the frames to move the sliding frame so that the abut. ment engages the rock face and between the drill and the sliding frame to urge the drill along the guideway of the sliding frame. As shown, a rotatable boom 4, which may be swung horizontally and vertically on pivots 32 and 37 respectively attached to a mobile platform 1, carries a rotatable mounting 75 to which is pivoted, at 96, a frame structure 5 comprising a supporting frame 98 within which is a sliding frame 106 in which is slidingly mounted a drill mechanism 135. The sliding and supporting frames may be tubular, the former moving telescopically with respect to the latter. A continuous chain feeds the drill into the rock face, and a cable gear 125 presses the abutments 197 against the rock face. The movements of the various movable parts of the apparatus may be operated by hydraulic cylinders which may trap the liquid and so lock the part against further movement. A brake on the supporting frame may hold the sliding frame against longitudinal movement during the feeding of the drill. The mechanism 135, which may be disconnected from the drill, may carry a cradle supporting a timber to be placed in position. The arrangement of the rotatable parts is such that the drill may be placed to drill a hole in any position, Figs. 26, 27 and 28 (not shown). Hydraulic fluid is supplied to the hydraulic cylinders by an electrically-driven pump. Specification 731,567, [Group X], is referred to.