Drill bit retainer for a down hole hammer assembly

Details Drill bit retainer for a down hole hammer assembly Drill bit retainer for a down hole hammer assembly

1996-05-13

1998-09-08

Dang, Hoang C.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175415, E21B 414

Patent

active

058031928

ABSTRACT:
A down hole hammer assembly for percussive drilling of ground holes has a drill bit slidably carried in a chuck housed within a barrel of the assembly. Drill bit travel is limited by a retainer sleeve in place about a reduced segment of the drill bit. The sleeve includes a ring portion limiting bit travel and a skirt portion for confinement within a component of the hammer assembly to prevent loss of the retainer sleeve and drill bit during barrel separation.

REFERENCES:
patent: 2947519 (1960-08-01), Feucht
patent: 3322216 (1967-05-01), Kurt
patent: 4706764 (1987-11-01), Hughes
patent: 4962822 (1990-10-01), Pascale
patent: 5154244 (1992-10-01), Elsby et al.
patent: 5207283 (1993-05-01), Lay
patent: 5390749 (1995-02-01), Lyon

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