Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1977-02-08
1978-06-27
Novosad, Stephen J.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
175335, 175339, 175343, 175410, 175371, 175417, 175418, E21B 908, E21C 1301, E21C 1306
Patent
active
040969177
ABSTRACT:
A partially solid head bit having a flow passage therethrough located at approximately the center of the bit is shown. The bit is designed for use in conjunction with a hammer action drilling apparatus. The flow passage extends through a shank of the bit to the bottom thereof. Surrounding the shank is a substantially hemispherical spiraled burr having an opening therethrough. The burr pushes against a shoulder of the shank during drilling. The mating surfaces of the shank and burr are lubricated by a suitable oil reservoir. On spirals of the burr and on the lower end of the shank are mounted hardened inserts for impacting against and breaking up the formation through which the bit may drill. The bottom of the shank may be even with, extend through, or be recessed with respect to the lower edge of the burr. The shank is angled a few degrees off the centerline of the drilling string to cause a wobbling action upon rotating the drill bit.
REFERENCES:
patent: 1758814 (1930-05-01), Zublin
patent: 1859948 (1932-05-01), Zublin
patent: 1906056 (1933-04-01), Golish
patent: 1945240 (1934-01-01), Tupica
patent: 2025260 (1935-12-01), Zublin
patent: 2101007 (1937-11-01), Maher
patent: 2113820 (1938-04-01), Zublin
patent: 3357507 (1967-12-01), Stewart
patent: 3429390 (1969-02-01), Bennett
patent: 3847234 (1974-11-01), Schumacher, Jr. et al.
patent: 3918538 (1975-11-01), Bender
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