Plural-part earth bit, and an improved bit head therefor

Details Plural-part earth bit, and an improved bit head therefor Plural-part earth bit, and an improved bit head therefor

1983-08-17

1985-03-19

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Core forming type

464 45, 285 92, 279 1W, E21B 1000

Patent

active

045053430

ABSTRACT:
According to a depicted embodiment thereof, the novel earth bit comprises a shank having a threaded end and a bit head centrally bored and threaded to receive a shank. A stack of apertured discs, however, is interposed between the threaded bore or cavity in the bit head and the threaded end of the shank. The discs intimately engage, and bridge between, the shank and bit head threads, and communicate torque therebetween. The bit head cavity has a bearing surface or land upon which the discs are supported, and the shank has an annular shoulder which bears upon the stack and, thus, compressive forces are communicated from the shank to the bit head. The bit head, of the invention, then, comprises the aforesaid bit head, having the stack of discs secured therein by a retainer, for use, in a plural-part earth bit having a threaded shank.

REFERENCES:
patent: 2209079 (1940-07-01), Gillman
patent: 2605850 (1952-08-01), Kiekhaefer
patent: 3062568 (1962-11-01), Andersen
patent: 3396557 (1968-08-01), Moore, Jr.
patent: 3521716 (1970-07-01), Fisher
patent: 3687493 (1972-08-01), Lock
patent: 3756628 (1973-09-01), St. Clair
patent: 4043409 (1977-08-01), Walter
patent: 4362450 (1982-12-01), Hasegaewe

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