Rock drilling device

Details Rock drilling device Rock drilling device

1992-08-31

1993-09-14

Bui, Thuy M.

Boring or penetrating the earth

With magazine for successively moving unconnected, oriented...

175 85, E21B 700

Patent

active

052440494

ABSTRACT:
Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7), a rod (9) and an end piece (11). The rod is provided with projections (10) at least near one of its ends for cooperation with parts (13,14) with reduced diameter in the tube and end piece respectively. The part (13) in the tube limits the movement of the rod in a direction away from the end piece. The part (14) in the end piece limits the movement of the rod in a direction towards the end piece. All thread connections (12) between different sections of the drilling tool and between tube and end piece within each section are made in the same way and thus equally easy to break.

REFERENCES:
patent: 3420319 (1969-01-01), Lincoln et al.
patent: 3741322 (1973-06-01), Wolters
patent: 3913753 (1975-10-01), Swartz et al.
patent: 4765401 (1988-08-01), Boyadjieff

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