GB681166A - Machine for operating in rock, coal and like earth - Google Patents

Abstract

681,166. Drill trollies. HARDYPICK, Ltd., and HURD, E. W. Oct. 5, 1950 [July 5, 1949], No. 17761/49. Class 124. A coal or rock working machine has a jib carrying a drill unit and is turnable about a vertical axis, movable in a vertical plane, movable about its own axis and the drill unit is pivotable about an axis normal to the axis of the jib. As shown, a track laying vehicle driven by two motors 21 has a quadrant 14, horizontally disposed, and a turntable 16 mounted above it for rotation on rollers 15 by a handwheel 17 and pinion 20. A jib cradle 25, mounted on brackets 24 on the turntable, carries a hollow jib shaft on which is mounted a double boom, jib 41 having journals 42 in which is pivoted a self-contained drill unit 44. The angular position of the drill unit is controlled by a rod 47 connected through a spring buffer. to a movable internally screwed rod which latter co-operates with an externally screwed rod rotated by a handwheel 51. The hollow jib shaft mounted in the jib cradle is rotatable about its own axis by a hanlwheel 40 operating a worm gear. The jib cradle is pivoted in a vertical plane about trunnions 26 by a hydraulic jack 28, the cylinder of which is pivotally connected to the turntable at 29 and the piston rod 30 to a bracket 32 fixed to the cradle. If the axis of the drill bit 53 passes through the axis of the journals 42 and is arranged near a boundary of the drill unit, the thrust from the drilling is taken by the journal and the tool operates with the minimum headroom. The Provisional Specification also includes the use of a .single motor for driving the track-laying vehicle.