| US 7,600,589 B2 | ||
| Rotary drill bits | ||
| Anton F. Zahradnik, Sugarland, Tex. (US); Eric C. Sullivan, Houston, Tex. (US); R. Scot Smith, Erath, La. (US); Daniel E. Ruff, Kingwood, Tex. (US); Danielle V. Roberts, Calgary (Canada); and Alan J. Massey, Houston, Tex. (US) | ||
| Assigned to Baker Hughes Incorporated, Houston, Tex. (US) | ||
| Filed on Nov. 29, 2007, as Appl. No. 11/947,624. | ||
| Application 11/947624 is a continuation of application No. 11/090932, filed on Mar. 25, 2005, granted, now 7,472,764. | ||
| Prior Publication US 2008/0066970 A1, Mar. 20, 2008 | ||
| Int. Cl. E21B 10/36 (2006.01) | ||
| U.S. Cl. 175—374 [175/435] | 20 Claims |
| 1. A rotary drill bit for drilling a subterranean formation, comprising:
a bit body having a longitudinal axis and including a leading end for contacting a formation during drilling;
a shank structure, comprising at least one frustoconical surface matingly engaging a complementary frustoconical surface of
the bit body;
a weld recess substantially formed between one of an extension of the matingly engaged frustoconical surface of the shank
structure and an extension of the matingly engaged complementary frustoconical surface of the bit body and another frustoconical
surface of the other of the shank structure and the bit body;
at least one weld affixing the shank structure to the bit body and substantially disposed within the weld recess; and
at least one cutting element secured to the bit body.
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