Drill bit with set of underreamer arms

Details Drill bit with set of underreamer arms Drill bit with set of underreamer arms

1996-07-01

1998-08-04

Neuder, William P.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by cam or gear axially rotatable...

175286, 175389, F21B 1066

Patent

active

057879990

ABSTRACT:
A drill bit assembly includes a driver adapted for attachment to a down hole pneumatic hammer. A pilot bit is coupled to the driver in a manner permitting rotational and axial movement between driver and pilot bit. A series of underreamer arms are disposed intermediate the driver and the pilot bit and engage a centrally disposed cam block on the pilot bit. Pivot pins of the underreamer arms are journaled in and move with the driver during partial rotation of the driver during arm deployment and retraction. Passageways in the driver and pilot bit direct compressed air to the working surface of the bit for discharging particles upwardly through channels in the bit and driver. Inclined surfaces on the underreaming arms cooperate with the lower end of a casing to contribute to arm retraction prior to removal of the assembly through the casing.

REFERENCES:
patent: 3365010 (1968-01-01), Howell et al.
patent: 4770259 (1988-09-01), Jansson
patent: 5052503 (1991-10-01), Lof

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