Damping device for a percussion rock drilling machine
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United States of America Patent
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-
Oct 3, 1989
Grant Date -
N/A
app pub date -
Oct 7, 1987
filing date -
Oct 15, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Damping device for a percussion rock drilling machine. A damper piston (22) and a compressed air cushion in a damping chamber (23) transfer feeding force from the drill machine housing (11) to the drill string (15). A venting valve (51) is arranged for venting the damping chamber (23) after which the damping chamber can be pressurized with a selectable pressure.
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