Drill bit and drill tip having a tip-locating structure

Details Drill bit and drill tip having a tip-locating structure Drill bit and drill tip having a tip-locating structure

2006-05-30

2006-05-30

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S417000

Reexamination Certificate

active

07051822

ABSTRACT:
A drill bit assembly includes a drill bit having a leading end to which a drill tip is bonded. The drill tip has a front cutting edge, a pair of side cutting edges, a rear end and a pair of parallel side walls extending between the respective edges. The leading end is arranged to support the drill tip along the rear end and against the parallel side walls. The drill bit includes a bore extending axially therethrough and opening into the leading end. The drill tip extends across the bore but permits egress of flushing liquid from the bore. The drill tip includes projections arranged to cooperate with an engagement face formed at the leading end to locate the drill tip in a bonding position relative to the leading end prior to bonding of the drill tip to the leading end. The cooperation is such as to resist shifting movement of the drill tip in a direction of elongation of the tip and out of the bonding position.

REFERENCES:
patent: 4633959 (1987-01-01), Knox
patent: 4688652 (1987-08-01), Crist
patent: 5184925 (1993-02-01), Woods et al.
patent: 6309159 (2001-10-01), Weaver et al.
patent: 6684968 (2004-02-01), Bise et al.
patent: 2002/0195280 (2002-12-01), Bise et al.

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