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. 28, 2022
Filed:
Sep. 07, 2017
Osg Corporation, Toyokawa, JP;
Takahiro Yamamoto, Toyokawa, JP;
Hiroyasu Makino, Toyokawa, JP;
OSG CORPORATION, Toyokawa, JP;
Abstract
Two discharge grooves () are formed in a drill (). A cutting edge () is formed on a ridge section between an inner face () that faces a rotation direction (T) side of the discharge groove (), and a flank (). A thinning edge () is formed from an inner end () of the cutting edge () to the side of a chisel (), by thinning processing, and further, a gash portion () is formed from an inner end () of the thinning edge (), the gash portion extending in a circular arc shape and being connected to the discharge groove () further to an inner side in the radial direction than an outer peripheral surface (). A circular arc groove () is formed in a section connecting a thinning face () and a gash face (). The chips being cut by the thinning edge () are scooped up to the gash portion (), are curled, and are discharged to the discharge groove (). The chips are not likely to become caught by being provided with the circular arc groove (). Since the gash portion () connects to the discharge groove () further to the inner peripheral side than the outer peripheral surface (), the chips are cut relatively small.