The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 2009
Filed:
Nov. 29, 2007
Anton F. Zahradnik, Sugarland, TX (US);
Eric C. Sullivan, Houston, TX (US);
R. Scot Smith, Erath, LA (US);
Daniel E. Ruff, Kingwood, TX (US);
Danielle V. Roberts, Calgary, CA;
Alan J. Massey, Houston, TX (US);
Anton F. Zahradnik, Sugarland, TX (US);
Eric C. Sullivan, Houston, TX (US);
R. Scot Smith, Erath, LA (US);
Daniel E. Ruff, Kingwood, TX (US);
Danielle V. Roberts, Calgary, CA;
Alan J. Massey, Houston, TX (US);
Baker Hughes Incorporated, Houston, TX (US);
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.