Threaded element forming for example a screw, and assembly of pi

Details Threaded element forming for example a screw, and assembly of pi Threaded element forming for example a screw, and assembly of pi

1988-12-16

1989-08-29

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411423, 403307, 285334, F16B 3504, B25G 300, F16L 2500

Patent

active

048612103

ABSTRACT:
The present invention relates to an improved threaded element forming for example a screw, which comprises a thread (F) whose bottom (3) comprises two arcs of a circle (4) with equal radii (r.sub.1) which are connected tangentially with the sides (2) of thread (F) and one central arc of a circle (5) with a larger radius (r.sub.2), and which is connected tangentially with the two arcs of a circle (4).

REFERENCES:
patent: 3040327 (1977-08-01), Otaki
patent: 3433117 (1969-03-01), Gowen, Jr. et al.
patent: 3455587 (1969-07-01), Gallois
patent: 4549754 (1985-10-01), Saunders et al.
patent: 4799844 (1989-01-01), Chuang
French Search Report FR 8717774.

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