GB190627496A - Improvements in Controlling the Working Fluid of Rock-drilling and other Reciprocating Engines. - Google Patents

Abstract

27,496. Mauss, W. Dec. 3. Rock drills.-In a reciprocating engine, such as a rock drill, especially of the type described in Specification No. 5022, A.D. 1906, in which the rear piston face is constantly exposed to full pressure and the fluid operates expansively on the larger front piston face, the air port n, which communicates air to the front cylinder through a valve h, is covered by the rear piston on its backward stroke to' produce expansion in the cylinder. The air is admitted at the port e and when, on the forward stroke, the port o is uncovered the valve is moved forward and the exhaust port l from the front cylinder closed. Exhaust from the front of the valve passes through ports p, f. The motion of the valve connects the ports n, m and the piston is returned ; but when the port n is closed by the piston head c, the remainder of the stroke is produced by expansion. The valve is returned when the port p is uncovered, exhaust from the rear.,. end of the valve passing through ports o, f. The valve has leather packing-rings k to preclude rebound from the stops j.