PERCUSSIVE-ACTION HYDRAULIC MECHANISM Russian patent published in 1999 - IPC

FIELD: machinery for mining and construction industry. SUBSTANCE: this relates to percussive-action mechanisms intended for working in frozen ground and rock matter in construction activities and mining industry. Mechanism has body with gas energy accumulator, cocking chamber which incorporates striker with head and stepped valve which is pressed-on by resilient energy accumulator. Stepped valve by its surface and body creates pressure space, overflow space, and slot which are periodically connected to cocking chamber. Slot connects overflow space and pressure space to each other. Pressure space through hole made in body can periodically communicate through three-position hydraulic control valve with return line and pressure line. Stepped valve is provided with shoulder and is installed for possible periodic introduction of valve shoulder into slot for closing of slot and pressure space. Internal surface of stepped valve and striker head create under-valve space which at cocking of striker is connected with pressure space through passages in valve. Overflow space is constantly connected to return line. Cocking chamber is constantly connected to pressure line. Aforesaid embodiment of percussive-action hydraulic mechanism ensures higher productive capacity due to possibility of transfer from single-strike operation to automatic operation. EFFECT: higher efficiency. 1 dwg