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:
Jun. 21, 2016
Filed:
Apr. 05, 2013
Sumitomo Electric Hardmetal Corp., Itami-shi, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Takumi Tamura, Itami, JP;
Masahiro Yoshida, Mie-gun, JP;
Yoshiharu Kaimori, Tokyo, JP;
Yuzuru Ono, Handa, JP;
SUMITOMO ELECTRIC HARDMETAL CORP., Itami-shi, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
FUJI JUKOGYO KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A bit exchangeable drill includes a detachable cutting head at the tip of a drill body, and the cutting head includes a cutting edge extending linearly from a rotation center to a radial outer end in axial end view, and a helical flute. At a rake face continuous with the cutting edge, a thinning face inclined relative to the rotation axis and rendering an axial rake angle of the cutting edge negative is formed entirely from a radial inner end to a radial outer end of the cutting edge.