Mine ceiling drill bit and blade

Details Mine ceiling drill bit and blade Mine ceiling drill bit and blade

2006-09-05

2006-09-05

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C175S420100, C408S224000

Reexamination Certificate

active

07100714

ABSTRACT:
A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The bit body has a table near the center of the blade to reduce the speed at which the drill bores into hard material. The blade has a central slot extending into the forward end thereof such that the slot defines inner side walls and a bridge extending between the inner side walls. The bridge has sloping sides the define a central cutting edge so as to cut particles of hard material accumulating in the slot. The inner side walls intersect the leading faces of the blade and form cutting edges which further cut particles loosened at the center of the cut. Also, relief flats relieve the concentration of forces at the ends of the primary cutting edges of the blade.

REFERENCES:
patent: 3032129 (1962-05-01), Fletcher et al.
patent: 3163246 (1964-12-01), Vagins et al.
patent: 4342368 (1982-08-01), Denman
patent: 4984944 (1991-01-01), Pennington et al.
patent: 5184689 (1993-02-01), Sheirer et al.
patent: 5287937 (1994-02-01), Sollami
patent: 5311959 (1994-05-01), Adams
patent: 5458210 (1995-10-01), Sollami
patent: 6684968 (2004-02-01), Bise et al.

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