B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40.14
B25D 9/12 (2006.01) F01L 25/06 (2006.01) F03C 1/007 (2006.01) F16H 43/00 (2006.01)
Patent
CA 1038725
ABSTRACT OF THE DISCLOSURE The present invention teaches a hydraulic per- cussion device which has a working piston displaceable in a working cylinder and a control part displaceable in a control cylinder. The control part has at least one control face on which the pressure of a control line connected with the working cylinder acts, and also has a pressure reservoir connected to the pressure line, and a pump device which delivers pressurized liquid into the pressure line. The invention is characterized in that, for producing impacts or blows the percussion force of which is constant, independently of the delivery capacity of the pump device, there is pro- vided a device which, subsequent to or during lift of the working piston, permits change-over or reversal of the control part into that position which corresponds to the impact movement of the working piston only when pressure and quantity in the pressure reservoir have exceeded a threshold value.
246078
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