GB190406183A - Method of Ejecting Rock Cuttings from Holes in Rock while Drilling them. - Google Patents

Abstract

6183. Leyner, J. G. March 14. Rock drills.-In percussive drills actuated by compressed air or the like, part of the motive fluid, together with water under pressure, is conveyed near the cutting-point of the drill, and delivered into the hole during the drilling operation to lay the dust, and to expel the dÚbris. The invention is shown as applied to a drill with a loose tool spindle, which is struck by a separate reciprocating piston. The water is supplied from closed tanks, placed at suitable points, by means of the pressure of the air which drives the drills, or by other means. The rotating gear and the feed are also described, the constructional features being given in some detail. The tool or tool spindle 20 is carried by the sleeves 3, 4 in the front cylinder head so that it can be struck by the loose piston. The outer sleeve 4 is held in the cylinder head by a collar and spring 28, while a U or staple piece 33 fits in its forward end to prevent the spindle from falling out, but allows of its ready removal. The inner sleeve bears on a spring buffer 9, and is shaped internally so that the spindle can slide but cannot turn in it. In order to turn the tool, the sleeve 3 has two or more rods 11 projecting into the piston, which is turned by a usual rifle-bar arrangement. The feed-screw works through a thrust bearing K carried by rods T from the cradle. Water is admitted to the hollow tool by a tube 18 passing through the rifle bar and piston, and attached to the back cylinder head, where a valve 43 controls the supply from a hollow ring 50, which is rendered water-tight by washers and nuts 54, though it can be turned to place the water inlet in a suitable position. Part of the compressed air or motive fluid from the forward end of the cylinder passes down the tool together with the water.