Secondary retainer for a downhole hammer bit

Details Secondary retainer for a downhole hammer bit Secondary retainer for a downhole hammer bit

2005-10-24

2008-03-18

Bagnell, David (Department: 3672)

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

C173S133000

Reexamination Certificate

active

07343989

ABSTRACT:
A bit retainer system is disclosed. The bit retainer system includes a bit having a head and a shank, a driver sub disposed around the shank of the bit and adapted to engage a hammer case, a bit retainer disposed around the shank of the bit and abutting an upper end of the driver sub, and a secondary retainer disposed around the bit retainer.

REFERENCES:
patent: 2855052 (1958-10-01), Wright et al.
patent: 2942579 (1960-06-01), Morrison
patent: 3322216 (1967-05-01), Kurt
patent: 3343890 (1967-09-01), Homer
patent: 5390749 (1995-02-01), Lyon
patent: 5562170 (1996-10-01), Wolfer et al.
patent: 5803192 (1998-09-01), Holte
patent: 6464023 (2002-10-01), Patterson
patent: 6516903 (2003-02-01), Rogers
patent: 6789632 (2004-09-01), Green

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