Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection – Frangible connection
Patent
1992-01-14
1993-04-06
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Torque responsive nut or bolt driving connection
Frangible connection
411392, 411412, 411510, 411907, 411913, 29456, 295221, 296 353, F16B 1900, F16B 3100, F16B 3500, B21D 3900
Patent
active
051998343
ABSTRACT:
A fastener which releasably retains a first member in relation to a second member. The fastener is frangible for fracture upon the application of a tensioning force thereto permitting the first and second members to which the fastener is engaged to be displaced relative to one another. The fastener, once fractured, is retained in the corresponding first and second members to which it was originally attached to prevent the generation of loose pieces. An installation tool is also provided for installing the fastener into the first and second members. The fastener includes a shank which fractures into a first and a second segment. A frangible portion of the fastener is spaced along the shank between the first and second segments and defines such segments for providing a predetermined fracture point. Non-planar engaging portions on the first and second segments retain the fastener in the corresponding first and second members once engaged therewith even after fracture of the fastener. The non-planar engaging portions also prevent the fastener from rattling while it is engaged with the members. The engagement portions include a thread which has a thicker base component and a generally flexible crest component.
REFERENCES:
patent: 2426326 (1947-08-01), Tooms
patent: 3865006 (1975-02-01), Massoney
patent: 3905570 (1975-09-01), Nieuwveld
patent: 4591203 (1986-05-01), Furman
patent: 4976715 (1990-12-01), Bays et al.
patent: 5061137 (1991-10-01), Gourd
Marvell Michael D.
Seidl Richard
Textron Inc.
Wilson Neill R.
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