B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40.13
B25D 9/12 (2006.01) F01L 17/00 (2006.01) F01L 25/06 (2006.01) F03C 1/03 (2006.01)
Patent
CA 1047883
ABSTRACT OF THE DISCLOSURE Hydraulically driven striking device The present invention relates to a hydraulically driven striking device,comprising - a frame, - a striking piston striking against a tool and moving in the stroke and return direction in the frame, - a high pressure circuit and a low pressure circuit formed in the frame, - a first cylinder space surrounding the striking piston and continuously communicating with the high pressure circuit, - a second cylinder space surrounding the striking piston and alternately communicating with the high pressure and low pressure circuit, and - a sleeve shaped control valve positioned in the latter cylinder space and surrounding the piston, said control valve being arranged to control the coupling of the second cylinder space to the high and low pressure circuit by moving in the cylinder space in the stroke and return direction of the striking piston essentially synchronously with the striking piston, the hydraulic fluid thereby 2 pushing the control valve in the return direction, whereby, when the striking piston stops when striking against the tool, the control valve continues to move in the return direction, thus disconnecting the connection from the second cylinder space to the low pressure circuit and opening the connection from the second cylinder space to the high pressure circuit, and an annular chamber being formed in the wall of the second cylinder space and the outer wall of the control valve being provided with a corresponding pressure action surface.
255685
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