Rock drilling apparatus

Details Rock drilling apparatus Rock drilling apparatus

1996-03-13

1997-11-25

Tsay, Frank

Boring or penetrating the earth

With above-ground guide for relatively advancing tool

173185, E21B 1908

Patent

active

056901844

ABSTRACT:
A rock drilling apparatus includes a frame having a front end, a guide rod supported on the front end of the frame, a rotary rod extending parallel to the guide rod and supported on the frame for rotation about its own axis and longitudinal movement beyond the front end of the frame, and a drill bit mounted on a front tip end of the rotary rod. The guide rod comprises a shank fixed to the front end of the frame and a tubular member extending substantially fully over the shank and rotatably disposed around the shank.

REFERENCES:
patent: 3584524 (1971-06-01), Langenbach
patent: 3628614 (1971-12-01), Brennan
patent: 3804544 (1974-04-01), Adams
patent: 3807512 (1974-04-01), Pogonowski et al.
patent: 3902561 (1975-09-01), Friberg et al.
patent: 4681170 (1987-07-01), Ohi
patent: 5113951 (1992-05-01), Houben et al.
patent: 5133418 (1992-07-01), Gibson et al.
patent: 5358060 (1994-10-01), Ebara

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