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. 08, 2026
Filed:
May. 10, 2021
Osg Corporation, Toyokawa, JP;
Takahiro Yamamoto, Toyokawa, JP;
OSG CORPORATION, Toyokawa, JP;
Abstract
A drill is provided with a flank at a leading end portion of a body. An oil hole is provided at the flank, having a fan-shaped cross-section. The fan-shaped cross-section is formed by being surrounded by a front-side inner wall surface, a rear-side inner wall surface, an outer peripheral-side inner wall surface, and an inner peripheral-side inner wall surface. Compared to a round hole, a discharge performance of cutting fluid of the oil hole is high. The rear-side inner wall surface curves in a circular arc shape toward the front in a rotation direction. Thus, the drill can secure a distance between a ridge section of the flank and the rear-side inner wall surface to be wide, can suppress stress acting on a section between the ridge section of the flank and the oil hole, and can thus increase a discharge amount of the cutting fluid and also secure a tool rigidity.