B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40.13
B25D 9/12 (2006.01) E21B 6/00 (2006.01)
Patent
CA 1130171
Abstract of the Disclosure This invention relates to a hydraulic drilling appara- tus, especially a rock drill. It comprises a body, a cylinder in the body and a percussion piston reciprocating in the cylinder. A tool is connected to the body and a motor rotates the tool. There is a control valve for the percussion power, a control valve for the rotation motor speed and both of these valves are operated interdependently by one lever. A hydraulically operated flushing valve, a hydraulic pump and hydraulic channels form a percussion circuit and a rotation circuit which is parallelly coupled with the percussion circuit in relation to the hydraulic pump. A hydraulic valve circuit is controlled by the percussion circuit and a circuit for the free circulation for the hydraulic pump which is parallelly coupled with the percussion circuit in relation to the hydraulic pump. The circuits are connected to the hydraulic pump and the improvement consists in that the control valves are in the body of the percussion apparatus and: the valve in the rotation circuit controlling the flow rate is a pressure-compensated flow control valve with throttling control.
354816
Helin Aimo
Karru Esa
Paasonen Hannu
Salmi Pekka
Bereskin & Parr
Oy Tampella Ab
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