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:
Oct. 27, 2015
Filed:
Dec. 24, 2009
Manabu Saito, Tokyo, JP;
Tatsuo Nakahata, Tokyo, JP;
Hideharu Takahashi, Tokyo, JP;
FUJI JUKOGYO KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A drill includes a cutting edge having a ridgeline. The ridgeline has a part of an ellipse and a straight line. It is assumed that the coordinates of a separation point of an ellipse portion from a straight line portion are (x, y). The straight line is a tangent to the ellipse at the separation point. It is assumed that ais an area from a tip end of the drill to x, ais an area from xto the origin of the ellipse, and ais a negative area, along the x-axis. The ridgeline of the cutting edge is formed straight along the tangent in the area a, and is formed along the ellipse in the area a. A margin is formed in the area acontinuously from a relief face of the cutting edge.