HYDRAULIC PERCUSSION TOOL Russian patent published in 1996 - IPC

FIELD: mining, in particular, hydraulic percussion tools. SUBSTANCE: hydraulic percussion tool includes casing, block-head piston, pressure and discharge hydraulic accumulators, pressure and discharge mains and slide-valve distributor provided with two hydraulic springs connected alternately through individual passages to the discharge and pressure mains through ring turnings of the block-head piston. Hydraulic springs are placed in butt parts of the slide valve and made in the form of overflow chambers interconnected through radial and axial openings to butt spaces of the slide valve and through passages to ring turnings of the block-head piston. EFFECT: high efficiency. 2 cl, 1 dwg