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:
Dec. 23, 2008
Filed:
Mar. 02, 2004
Sadayuki Akaki, Tokyo, JP;
Masao Mitsui, Tokyo, JP;
Willard E. Henderer, Evans, GA (US);
Yamawa Mfg. Co., Ltd., Tokyo, JP;
Kennametal Inc., Latrobe, PA (US);
Abstract
A high-speed forming tap () for cutting and forming a female screw by cutting edges (E) of a screw portion () fed in synchronous with the rotation of a machine tool. The high-speed forming tap is characterized in that chamfers (CF) are provided at a bevel lead () of the screw part (). The chamfers (CF) start from the cutting edge (E) and are provided along ridgelines (R) between a crest face () and flanks, or a following flank () and a leading flank (). This structure enables the shape of the edges of the tap leading portion to be stably maintained and high-speed, smooth female screw cutting with high accuracy, and provides a tap with long life.