Rotary drill bit compensating for changes in hardness of...

Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation

Reexamination Certificate

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C175S393000

Reexamination Certificate

active

06962217

ABSTRACT:
A long lasting rotary drill bit for drilling a hole into variable hardness geological formations that has a self-actuating mechanism responsive to the hardness of the geological formation to minimize the time necessary to drill a borehole. A long lasting rotary drill bit for drilling a hole into variable hardness geological formations that has a mechanism controllable from the surface of the earth to change the mechanical configuration of the bit to minimize the time necessary to drill a borehole. A monolithic long lasting rotary drill bit for drilling a hole into a geological formation having hardened rods composed of hard material such as tungsten carbide that are cast into a relatively soft steel matrix material to make a rotary drill bit that compensates for wear on the bottom of the drill bit and that also compensates for lateral wear of the drill bit using passive, self-actuating mechanisms, triggered by bit wear to drill relatively constant diameter holes.

REFERENCES:
patent: 4478296 (1984-10-01), Richman, Jr.
patent: 4720371 (1988-01-01), Shirley
patent: 4898252 (1990-02-01), Barr
patent: 4940099 (1990-07-01), Deane et al.
patent: 4995887 (1991-02-01), Barr et al.
patent: 5135061 (1992-08-01), Newton, Jr.
patent: 5311958 (1994-05-01), Isbell et al.

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