Rock drilling device

Details Rock drilling device Rock drilling device

1993-03-31

1994-06-14

Bui, Thuy M.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175135, E21B 1700

Patent

active

053201892

ABSTRACT:
Rock drilling device comprising a backhammer unit (10) in which a hammer piston (9) is movable to-and-fro for automatically exposing a tube string (4) to impacts in a direction away from a drill bit (8) in the tube string. The backhammer unit comprises a housing (13) and a springloaded tube part (14). The housing and the tube part form between them a first valve (16) and a second valve (17). At drilling the first valve which controls the supply of driving medium to said hammer piston is closed and the second valve which controls the flushing medium flow is open. At backwards feeding of the rock drilling machine (2) along the feed beam (1) with a force which exceeds a predetermined value the first valve is open and the second valve is closed.

REFERENCES:
patent: 3154158 (1964-10-01), Lincoln
patent: 3552500 (1968-01-01), Peterson
patent: 3977480 (1976-08-01), Hilding
patent: 4387775 (1983-06-01), Adolfsson et al.
patent: 5085284 (1992-02-01), Fu

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