Superposed drilling device

Details Superposed drilling device Superposed drilling device

1992-05-04

1993-04-27

Bui, Thuy M.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175415, E21B 1707

Patent

active

052053660

ABSTRACT:
The device comprises a solid drill bit (28) and an annular drill bit (40). Axial impacts are exerted on the solid drill bit (28) which are transmitted onto the annular drill bit (40) through impact transmission surfaces. The annular drill bit (40) is freely axially displaceable within limits. It has rearwardly projecting tongues (43) that engage windows (15) of an outer pipe end piece (12). Thus, the movability of the annular drill bit (40) is ensured without any keyings or the like being necessary, which entail the risk of a clogging with bore material. All movable parts are included in the scavenging so that jamming is avoided.

REFERENCES:
patent: 3227230 (1966-01-01), Lagerstrom
patent: 3370658 (1968-02-01), Jansson
patent: 3613807 (1971-10-01), Gallis
patent: 5038874 (1991-08-01), Larsson et al.

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