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:
Jul. 26, 1983
Filed:
Jun. 26, 1980
Takashi Kashiwagi, Gifu, JP;
Hiroshi Kasutani, Gifu, JP;
Mitsubishi Kinzoku Kabushiki Kaisha, Tokyo, JP;
Abstract
A drill bit comprises a body of a cylindrical shape having a straight groove of a generally V-shape formed in the circumferential surface thereof and extending along the longitudinal axis thereof. The bit body has a drilling fluid passageway extending longitudinally therethrough. One of the two side faces defining the longitudinal groove has a radially inwardly-disposed convex surface of a semi-cylindrical shape and a flat surface extending radially outwardly from the semi-cylindrical surface of the periphery of the cylindrical bit body. The semi-cylindrical surface terminates at its forward end in an arcuate inward cutting edge while the flat surface terminates at its forward end in a straight outward cutting edge. The arcuate inward cutting edge is offset from the straight outward cutting edge when viewed from the forward end of the bit body.