Threaded – headed fastener – or washer making: process and apparat – Implement – e.g. – die – etc. – Tap
Reexamination Certificate
2004-03-02
2008-12-23
Tolan, Edward (Department: 3725)
Threaded, headed fastener, or washer making: process and apparat
Implement, e.g., die, etc.
Tap
C408S220000
Reexamination Certificate
active
07468001
ABSTRACT:
A high-speed forming tap (1) for cutting and forming a female screw by cutting edges (E) of a screw portion (2) 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 (2a) of the screw part (2). The chamfers (CF) start from the cutting edge (E) and are provided along ridgelines (R) between a crest face (2e) and flanks, or a following flank (2c) and a leading flank (2d). 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.
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Akaki Sadayuki
Henderer Willard E.
Mitsui Masao
Kennametal Inc.
Oliff & Berridg,e PLC
Tolan Edward
Yamawa Mfg. Co., Ltd.
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