Bit retention device for a bit and chuck assembly of a down-the-

Details Bit retention device for a bit and chuck assembly of a down-the- Bit retention device for a bit and chuck assembly of a down-the-

1996-06-10

1997-07-15

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175414, 173132, E21B 406, E21B 414

Patent

active

056474474

ABSTRACT:
A bit retention device for a bit and chuck assembly of a down-the-hole, percussive drill, for retaining a head section of a bit should the head section separate from a shank of the bit includes a chuck adapted for threadable connection to a drill casing, a drill bit, a bit retaining shoulder in the the assembly; a wear collar concentric about the chuck and bit and a flexible retaining member removably connected to the assembly, the retaining member extending radially between the wear collar and bit a sufficient distance to contact the retaining shoulder should the bit drop axially downwardly.

REFERENCES:
patent: 3322216 (1967-05-01), Kurt
patent: 3735820 (1973-05-01), Curington
patent: 4079793 (1978-03-01), Mosely et al.
patent: 4083415 (1978-04-01), Kita et al.
patent: 4805705 (1989-02-01), Liljebrand et al.
patent: 4961469 (1990-10-01), Larsson et al.
patent: 5390749 (1995-02-01), Lyon
patent: 5435401 (1995-07-01), Hedlund et al.

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