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

Boring or penetrating the earth – Below-ground impact members – Fluid-operated

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175417, E21B 414

Patent

active

056998678

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.

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