Threaded fastener

Details Threaded fastener Threaded fastener

1994-12-05

1996-08-13

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

411411, 411436, 606 73, F16B 3504, F16B 3716

Patent

active

055449930

ABSTRACT:
A fastener which can be utilized with advantage as a bone screw or another osteosynthetic force transmitting member, instrument or accessory has a thread with two flanks each having a first section adjacent the crest and a second section adjacent the root of the thread. The second sections jointly include or consist of at least four concave portions having different radii of curvature and gradually merging into each other. The first sections make angles of at least 40.degree. with a plane which is normal to the longitudinal axis of the thread. The first and second sections of each tooth flank are separated from each other by an imaginary cylinder having a diameter which matches the pitch diameter of the thread and a longitudinal axis which coincides with or is at least close to the longitudinal axis of the thread.

REFERENCES:
patent: 4040327 (1977-08-01), Otaki
patent: 4527932 (1985-07-01), Onasch et al.
patent: 4799844 (1989-01-01), Chuang
patent: 4861210 (1989-08-01), Frerejacques
patent: 5380323 (1995-01-01), Howland
"Maschinenmarkt"(Oct. 25, 1988).
"Kunststoffberater"(Jun. 1983) article by J. Onasch.
"Maschinemarkt"(1985) article by P. Dietz et al..
"Konstruktion"(1986) article by M. Weck et al..

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