Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1989-07-21
1990-04-17
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411168, 411916, F16B 3504
Patent
active
049175556
ABSTRACT:
The joining element comprising a fastener or screw shank having a head has adjacent to said head a portion with a plurality of parallel, concentric fit-stretch rings, whose external diameter is 0.1 to 0.5 mm larger than the external diameter of the fastening thread. A fit slot is formed between in each case two rings, with a notch groove radius which is two to three times the top radius of the fastening thread. In the transition region between the head and the aforementioned portion is provided a fillet with a rounded portion having a diameter corresponding roughly to the pitch diameter of the rings and with a radius of curvature amounting to approximately to 0.1 to 0.15 times the external diameter. The rings have a stressing cross-section in the notch groove corresponding to the stressing cross-section of the fastening thread. The top width of the rings approximately corresponds to the side width of the preliminary shape of the rings.
REFERENCES:
patent: 2407586 (1946-09-01), Summers
patent: 3455587 (1969-07-01), Gallois
patent: 3630253 (1971-12-01), Sherman
patent: 3661406 (1972-05-01), Mele
patent: 4018132 (1977-04-01), Abe
Friedr. Boesner GmbH
Lindsey Rodney M.
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