Hydraulic control system for a rock drill
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United States of America Patent
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Apr 3, 1984
Issued Date -
N/A
app pub date -
May 5, 1983
filing date -
Sep 20, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rock drill having a hydraulic system for controlling striking, rotating and advancing movements of a drilling rod. The advancing or forward feeding conduit for a feed actuator is provided with a relief valve which is responsive to the pressure in the positive rotating conduit for a rotary actuator so that the pressure in the forward feeding conduit is relieved to weaken the advancing force when the load on the rotary actuator is increased. A further relief valve is also provided for relieving the pressure in the striker conduit to weaken the striking force.
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