Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Deformable securing means
Patent
1997-05-27
2000-02-01
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Deformable securing means
4113661, 411414, 4119372, 81302, F16B 1900, F16B 3500, B25B 712
Patent
active
060195592
ABSTRACT:
An improved fastener comprising a head portion, a flange portion, a shank portion which extends through two aligned apertures formed in adjacent panels and a collar swaged on the shank portion. The shank portion includes a gripping portion having a plurality of gripping surfaces formed between a plurality of cone shaped grooves, the configuration of the gripping portion being spiral shaped. The collar is installed by first positioning it over the fastener shank portion, an installation tool then swaging the collar thereto, the collar being tightly held by the multiple gripping surfaces to prevent movement in the direction of the longitudinal axis of the fastener. A mating spiral shaped configuration is formed along the interior surface of the collar during the swaging process. In order to remove the collar, a tool having pivotable jaw members is positioned in the space formed between the bottom surface of the shank portion and the overhanging portion of the collar, the jaw members being forced apart which, in a turn, forces the collar to expand outwardly from the fastener shank portion. A tool then engages the collar and rotates it in the counterclockwise direction, enabling the collar to spin off the shank portion.
REFERENCES:
patent: 4537542 (1985-08-01), Pratt et al.
patent: 4548533 (1985-10-01), Pratt
Myers Alan R.
Yamamoto Albert K.
Fairchild Holding Corp.
Keschner Irving
Wilson Neill
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