Hammer bit retention tool

Details Hammer bit retention tool Hammer bit retention tool

1990-12-21

1991-11-19

Bui, Thuy M.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175293, E21B 1036

Patent

active

050658271

ABSTRACT:
A retention system is disclosed for a hammer-percussion bit assembly which prevents the loss of the lower section of bit after a crack propagates through the shank (rotational drive) section of the bit. The system includes retainer which is mounted onto the drive sub of the assembly. The retainer is adapted to extend around the head section of the bit and functions to grab the severed bit head section upon lifting of the drill string while not interfering with the normal operation of the assembly.

REFERENCES:
patent: 3322216 (1967-05-01), Kurt
patent: 3353613 (1967-11-01), Harrison
patent: 4241800 (1980-12-01), Stenuick
patent: 4727944 (1988-03-01), Bottoms

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