Downhole hammer assembly

Details Downhole hammer assembly Downhole hammer assembly

2008-02-26

2009-12-01

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

C175S415000

Reexamination Certificate

active

07624824

ABSTRACT:
A drill bit assembly comprises a bit body intermediate a shank and a working face. The shank is adapted for connection to a drill string. The drill string comprising a fluid passage at least partially disposed within the body. A hammer assembly is movably disposed within the fluid passage along it central axis, the hammer assembly comprises a proximal end stabilized by a centralized upper bearing and a distal end stabilized by centralized a lower bearing. The distal end protrudes out of the working face and the hammer assembly comprises a carrier between the upper and lower bearings. Wherein, under normal drilling operations the carrier is adapted to resist a fluid pressure within the fluid passageway such that the fluid pressure will further extend the distal end of the hammer assembly from the working face by pushing on the carrier.

REFERENCES:
patent: 1372257 (1921-03-01), Swisher
patent: 1746455 (1930-02-01), Woodruff et al.
patent: 2054255 (1936-09-01), Howard
patent: 3303899 (1967-02-01), Jones, Jr. et al.
patent: 3336988 (1967-08-01), Jones, Jr.
patent: 6131675 (2000-10-01), Anderson
patent: 2003/0213621 (2003-11-01), Britten et al.

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