Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1987-07-28
1989-05-30
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
411413, F16B 2500
Patent
active
048346020
ABSTRACT:
A tapping screw having a tapered edge at a rear part of the tapered portion at its tip. The drill edge has the maximum diameter which is larger than the maximum thread diameter at the tapered portion and smaller than the maximum thread diameter at the shank. The drill edge allows the screw to be driven in more securely with a smaller driving force. The drill edge also has a greater lead angle than the lead angles of the threads on the tapered portion and on the shank rearwardly of the drill edge.
REFERENCES:
patent: 684774 (1901-10-01), Baggs
patent: 3316205 (1964-06-01), Angingh
patent: 3682507 (1972-08-01), Wand
patent: 3942405 (1976-03-01), Wagner
patent: 4241638 (1980-12-01), Shimizu et al.
Wilson Neill R.
Yao Seibyo Co., Ltd.
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