Rotary drill bits

Details Rotary drill bits Rotary drill bits

2007-11-29

2009-10-13

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S435000

Reexamination Certificate

active

07600589

ABSTRACT:
A shank configuration for rotary drill bits, is disclosed for positioning of the shank in relation to the bit body. A tapered surface or feature of the shank may be configured and sized to matingly engage a complementarily shaped surface or feature of the drill bit body and thereby become centered or positioned in relation thereto. A deformable element may be disposed between the shank and bit body. Also, the shank may comprise a material having a carbon equivalent of less than about 0.35%. A multi-pass weld procedure may be employed to affix the shank and bit body to one another wherein welds may be formed so that one weld originates at a circumferential position that differs from the origination circumferential position of its immediately preceding weld by at least about 90%. Further, a stress state may be developed within the multi-pass weld. A method of manufacture is also disclosed.

REFERENCES:
patent: 1426637 (1922-08-01), Hawkesworth
patent: 3213951 (1965-10-01), Eeles
patent: 4022287 (1977-05-01), Lundstrom et al.
patent: 4256194 (1981-03-01), Varel
patent: 4499958 (1985-02-01), Radtke et al.
patent: 4608861 (1986-09-01), Wachtler et al.
patent: 5033559 (1991-07-01), Fischer
patent: 5111895 (1992-05-01), Griffin
patent: 5150636 (1992-09-01), Hill
patent: 5225654 (1993-07-01), Harwig et al.
patent: 5295549 (1994-03-01), Dolezal et al.
patent: 5303785 (1994-04-01), Duke
patent: 5441121 (1995-08-01), Tibbitts
patent: 5732783 (1998-03-01), Truax et al.
patent: 5839525 (1998-11-01), Hoffmaster et al.
patent: 5878634 (1999-03-01), Tibbitts
patent: 6012744 (2000-01-01), Wilson et al.
patent: 6026917 (2000-02-01), Zahradnik et al.
patent: 6089123 (2000-07-01), Chow et al.
patent: 6098726 (2000-08-01), Taylor et al.
patent: 6116360 (2000-09-01), Evans
patent: 6138780 (2000-10-01), Beuershausen
patent: 6142249 (2000-11-01), Zahradnik et al.
patent: 7387177 (2008-06-01), Zahradnik et al.
patent: 7392862 (2008-07-01), Zahradnik et al.
patent: 2007/0102198 (2007-05-01), Oxford et al.
patent: 2007/0102199 (2007-05-01), Smith et al.
patent: 2007/0102200 (2007-05-01), Choe et al.
patent: 2007/0256862 (2007-11-01), Lund et al.
patent: 2009/0008154 (2009-01-01), El Hakam et al.
patent: 2009/0014217 (2009-01-01), Zahradnik et al.
patent: 2009/0031863 (2009-02-01), Lyons et al.
patent: 98/27310 (1998-06-01), None
International Search Report from PCT/US2006/010775 dated Mar. 29, 2007 (4 pages).
Metals Handbook®, Desk Edition, published by The American Society for Metals, eighth printing, May 1995, pp. 30-27 through 30-30.

Affiliated with

Also associated with

Rating

Rotary drill bits does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rotary drill bits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary drill bits will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4109734