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Robert Bryan
Edward Bryan
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2649. Bryan, R., and Bryan, E. Feb. 3. Rock drills.-In a fluid-pressure percussive drill for rock or stone, in which the valve is operated by the motive fluid, and which has a double D slide valve, operated on a port face shorter than itself by coned collars k<1> on a duplex plunger k, the piston is provided with a series of grooves f, which are connected by a groove f<1> and are used to connect fluid passing from the ends of the plunger cylinders l through the ports o with an exhaust port g. The valve plunger is operated by motive fluid when the ports o are uncovered by the respective ends of the piston. For starting the valve, a pusher h is provided, working through the ends of a plug m and pressed out by a spring.
GB190602649D1906-02-031906-02-03Improvements in Rock Drills.
ExpiredGB190602649A
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