PERCUSSIVE DEVICE Russian patent published in 1994 - IPC

FIELD: mining. SUBSTANCE: percussive device has body 1, piston-striker 2, control unit 9, two-position distributor 20, Piston-striker 2 is accommodated in body 1 for reciprocation and forms accumulating chamber 6 and cocking chamber 4 together with it. Cocking chamber is continuously communicated with pressure line 27 and periodically communicated with return line 8 through control unit 9. Control unit has spring-loaded valve 10 installed for interaction with piston-striker. Inlet of two-position distributor 20 is communicated with spring hollow 14 of valve 10, and its outlet, with return line 8. As a version, control unit 9 has additional spring-loaded valve. Valve hollow of additional valve is communicated with cocking chamber 4, and spring hollow, with spring hollow of valve. Prompt variation of impact energy is ensured by switching over two-position distributor 20 due to limiting stroke of cocking of piston-striker. EFFECT: higher efficiency. 2 cl, 2 dwg