Bit retention system

Details Bit retention system Bit retention system

1998-05-01

2000-06-06

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175414, 173132, E21B 1036

Patent

active

060706783

ABSTRACT:
A substantially tubular retainer member is provided, having a bore of substantially uniform internal diameter which can slip over the retention shoulder of the percussion bit, whether that shoulder is solid or threaded. Pins are then driven through holes in the retainer, under the retention shoulder. The pins retain the head of the bit in the event of bit breakage.

REFERENCES:
patent: 2252912 (1941-08-01), Armentrout
patent: 2949909 (1960-08-01), Macchioni et al.
patent: 3735820 (1973-05-01), Curington
patent: 4819746 (1989-04-01), Brown et al.
patent: 4903785 (1990-02-01), Odoni et al.
patent: 4962822 (1990-10-01), Pascale
patent: 5065827 (1991-11-01), Meyers
patent: 5390749 (1995-02-01), Lyon
patent: 5562170 (1996-10-01), Wolfer et al.
patent: 5699867 (1997-12-01), Jones

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