Extendable bit

Details Extendable bit Extendable bit

1997-02-13

1999-03-16

Schoeppel, Roger

Boring or penetrating the earth

Tool removable or insertable through or around driving or...

Laterally shiftable cutter element movable through shaft

175261, 175265, 175305, E21B 1038

Patent

active

058818278

ABSTRACT:
Extendable bit teeth are supported by the guide grooves formed on the end face at the point of a bit body in such a manner as to be slidable. The extendable bit teeth slide along the guide grooves in an excavating direction to thereby project from the end face at the point of the bit body. The extendable bit teeth slide in an opposite direction to the excavating direction to project from the outer periphery of the point of the bit body. Since the extendable bit teeth are pressed against the ground during excavation, the extendable bit teeth projects from the outer periphery of the point of the bit body so that the bit gauge can be extended, and most of the excavation hole is excavated by the bit body.

REFERENCES:
patent: 3933209 (1976-01-01), Sweeney
patent: 3990524 (1976-11-01), Sweeney
patent: 4002213 (1977-01-01), Sweeney

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