Abstract: The invention relates to a striking device (5) comprising a striking mechanism (8) which is driven by a pressure medium. Said device comprises a percussion piston (13) which can be displaced back and forth by means of a control device and a control valve which is embodied as a pressure shut-off valve (19) or as a stop valve, said control valve automatically stopping the striking mechanism if it exceeds a predetermined maximum value based on the working pressure controlling the inlet line, blocking the pressure line (3) or maintaining the control device in one of the and positions thereof. The inventive striking device also comprises a hydraulic catcher buffer which is used to brake the percussion piston when it exceeds a predetermined impact plane. According to the invention, the control valve must remain deactivated at least as long as the percussion piston is displaced on the hydraulic catcher buffer.

Abstract: A demolition claw has a support, a pivot pin mounted on the support and centered on and extending along an axis, and two jaws each having a hole through which the pivot pin extends so that the jaws can pivot on the support about the axis. The jaws have adjacent the respective holes confronting flat faces. An arcuate formation fixed on one of the faces adjacent the respective hole projects axially therefrom toward the other of the faces and is generally centered on the axis. A retaining formation fixed on the other of the faces adjacent the respective hole projects axially therefrom toward the one face, is radially offset from the arcuate formation, axially overlaps the arcuate formation, and surrounds the arcuate formation. Structure is provided on one of the jaws for preventing axial separation of the jaws.