Rock drilling device with recoil damper
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United States of America Patent
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-
Jan 2, 1996
Grant Date -
N/A
app pub date -
Oct 6, 1994
filing date -
Oct 15, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Rock drilling device for drilling with a drill string comprising a set of tubes (1) and a set of rods (2) arranged centrally in the set of tubes. The rock drilling device comprises conduit (22) for sensing a liquid pressure in a recoil damper (21) and actuating valves (23,24) for stopping the supply of pressure liquid to a hammer device (25) of the rock drilling device when the pressure in the recoil damper (21) falls below a predetermined value in order to prevent that the drilling tool and/or the machine housing is damaged at a to low damper pressure
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