Threaded – headed fastener – or washer making: process and apparat – Process – Making externally threaded fastener – e.g. – screw or bolt
Patent
1997-11-28
1998-12-01
Hail, III, Joseph J.
Threaded, headed fastener, or washer making: process and apparat
Process
Making externally threaded fastener, e.g., screw or bolt
B21H 302
Patent
active
058429239
ABSTRACT:
The screw comprises a circular thread portion 2a formed in a base portion of the screw, in which a helical thread is formed at the same depth and at the same crest angle; a special non-circular thread portion 2b which follows the portion 2a and has its thread depth gradually vary so as to assume a polygonal shape in cross section and permit the crest portion of thread to reach its highest points A-J in a turn of the thread, the highest points A-J being equal in thread depth and crest angle to the thread of the portion 2a; the portion 2b has its crest angle gradually increase as the thread moves from the highest points A-J to its lowest points along the length of the thread; and, lines connecting axially adjacent ones of the highest points A-J are tilted from the axis of the screw at a predetermined angle so that the portion 2b assumes a twisted polygonal prism-like shape as a whole.
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Brochure: Form and Tight TF-BOLT FT-SCREW, by Minebea Co., Ltd Tokyo Screw Div., Tokyo, Japan, printed in Japan.
Nakayama Ryoichi
Umemura Masaharu
Yamamoto Takashi
Hail III Joseph J.
Minebea Kabushiki-Kaisha
Nissan Jidosha Kabushiki-Kaisha
Tolan Ed
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