IMPACT DEVICE Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: impact device has a body with a groove accommodating coaxially mounted hammer having a multi-diameter piston and spring- actuated control valve, together forming a hammer operation stroke chamber, a pressure chamber connected to a pressure source, and a lead-up chamber. The device is provided with a hydraulic accumulator having a hydraulic chamber constantly connected to the pressure chamber and hammer lead-up chamber. The hammer lead-up chamber is alternately connected to a drain line or to the hydraulic accumulator hydraulic chamber, via radial openings made in a control valve stem, with hammer rod diameter being lower on the operation stroke chamber side than on the lead-up chamber side. A piston hammer projection is made two-diameter, with the projection diameters corresponding to the profile of the control valve inner grooves. EFFECT: enlarged operating capabilities. 4 dwg