Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1980-06-23
1982-10-26
Schroeder, Werner H.
Tool driving or impacting
Impacting devices
With means for rotating tool
B25D 926
Patent
active
043556914
ABSTRACT:
A hydraulic drilling apparatus, especially a rock drill comprising 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 is provided for rotating the tool. A control valve is also provided for the percussion power. A control valve is also provided for regulating the motor speed. Both of these control valves are operated independently by one lever. A hydraulically operated flushing valve is also provided. A hydraulic pump and hydraulic channels coact to form a percussion circuit and a rotation circuit is parallelly coupled with the percussion circuit in relation to the hydraulic pump. A flushing valve circuit is controlled by the percussion circuit and a circuit for the free circulation of 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. The control valves are disposed in the body of the percussion apparatus with one of these valves being in the rotation circuit for controlling the flow rate which valve is a pressure-compensated flow control valve with a throttling control.
REFERENCES:
patent: 4006783 (1977-02-01), Granholm
patent: 4028995 (1977-06-01), Salmi et al.
patent: 4064950 (1977-12-01), Salmi et al.
patent: 4126192 (1978-11-01), Wallace
Helin Aimo
Karru Esa
Paasonen Hannu
Salmi Pekka
Falik Andrew M.
OY Tampella AB
Schroeder Werner H.
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