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:
Aug. 02, 2005
Filed:
Apr. 17, 2002
Jiro Osawa, Glendale Heights, IL (US);
Kenjiro Kobayashi, Glendale Heights, IL (US);
Kazuhisa Kasuya, Glendale Heights, IL (US);
Takahiro Yamamoto, Toyokawa, JP;
Yoshihiro Takikawa, Toyokawa, JP;
Jiro Osawa, Glendale Heights, IL (US);
Kenjiro Kobayashi, Glendale Heights, IL (US);
Kazuhisa Kasuya, Glendale Heights, IL (US);
Takahiro Yamamoto, Toyokawa, JP;
Yoshihiro Takikawa, Toyokawa, JP;
OGO Corporation, Toyokawa, JP;
Abstract
A drill including a shank portion and a cylindrical body portion contiguous to each other. The cylindrical body portion includes (a) primary cutting edges and secondary cutting edges formed in its axially distal end portion such that each of the secondary cutting edges is located on a radially inner side of the corresponding primary cutting edge; (b) primary rake surfaces of the primary cutting edges and secondary rake surfaces of the secondary cutting edges; and (c) inclined surfaces each of which extends from the corresponding secondary rake surface to a periphery of the cylindrical body portion, and is inclined such that an axial distance between each of the inclined surfaces and the shank portion is reduced as viewed in a direction substantially perpendicular to the corresponding secondary cutting edge, from the corresponding secondary rake surface toward the periphery of the cylindrical body portion. Each of the secondary rake surfaces and the corresponding secondary cutting edge are formed together with each other in a web thinning. Each of the secondary rake surfaces and the corresponding inclined surface are connected to each other without a step therebetween.