Hammer drill bit and sub-assembly

Details Hammer drill bit and sub-assembly Hammer drill bit and sub-assembly

1986-12-12

1988-04-26

Novosad, Stephen J.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With tool shaft having plural passages for drilling fluid

175403, E21B 1002

Patent

active

047398442

ABSTRACT:
A cylindrical hammer drill bit with a central fluid passage and having a first group of circumferentially spaced lowermost cutting surfaces located on lowermost arcuate segments spaced by elongated upwardly extending circumferentially spaced slots and a second group of circumferentially spaced uppermost cutting surfaces located in intermediate arcuate segments at the upper end of the slots. Each of the cutting surfaces has an arcuate segment portion on the outer periphery of the drill bit formed at the intersection of upwardly inwardly sloping surfaces with the periphery of the drill bit; and radially inwardly upwardly inclined radial segment portions located on radially rib portions on the upwardly inwardly sloping surfaces. Each radial rib portion is connected to an elongated inwardly facing fluid slot.

REFERENCES:
patent: 3095053 (1963-06-01), Pistole et al.
patent: 3509953 (1970-05-01), Becker
patent: 3524511 (1970-08-01), Klemm
patent: 3858671 (1975-01-01), Kita et al.
patent: 3981371 (1976-09-01), Wallis

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