Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1983-03-03
1985-07-09
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411423, F16B 3500
Patent
active
045279322
ABSTRACT:
For the purpose of assuring, during insertion in plastic, a highly stressable connection between screw and plastic with relatively small driving torques, a self-tapping screw is provided with a symmetrical thread profile whose thread angle (8) changes steadily from the crest (5) of the flank to the root (3) of the thread.
REFERENCES:
patent: 1229560 (1917-06-01), Whiteman
patent: 1451484 (1923-04-01), Woodward
patent: 2512082 (1958-06-01), Bainbridge et al.
patent: 3433117 (1969-03-01), Gowen et al.
patent: 3726330 (1973-04-01), Adler
patent: 3748949 (1973-07-01), Dreger
Ehrenstein Gottfried
Onasch Jurgen
Holko Thomas J.
Richard Bergner GmbH & Co.
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