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Publication of BE742785ApublicationCriticalpatent/BE742785A/fr
B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
B25D9/06—Means for driving the impulse member
B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
E—FIXED CONSTRUCTIONS
E21—EARTH OR ROCK DRILLING; MINING
E21C—MINING OR QUARRYING
E21C37/00—Other methods or devices for dislodging with or without loading
E21C37/22—Hand tools or hand-held power-operated tools specially adapted for dislodging minerals