Rock drilling device with recoil damper

Details Rock drilling device with recoil damper Rock drilling device with recoil damper

1994-10-06

1996-01-02

Bagnell, David J.

Boring or penetrating the earth

With above-ground means to impact an earth-penetrating means

173 2, 173212, 175296, B25D 1724, E21B 600

Patent

active

054799961

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

REFERENCES:
patent: 4073350 (1978-02-01), Eklof et al.
patent: 4699223 (1987-10-01), Noren
patent: 4993504 (1991-02-01), Rodert et al.

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