Apparatus for making self-locking fasteners with a pressure roll

Details Apparatus for making self-locking fasteners with a pressure roll Apparatus for making self-locking fasteners with a pressure roll

1978-06-19

1980-09-23

Beck, Shrive P.

Coating apparatus

With heat exchange, drying, or non-coating gas or vapor...

118112, 118114, 118308, 427195, 427359, B05C 1900

Patent

active

042236320

ABSTRACT:
A self-locking threaded fastener of the type having a resilient thermoplastic resin patch bonded to the thread surface and a method and apparatus for making such fasteners are disclosed. The fastener is heated to a temperature in excess of the plastic melting temperature by induction heating coils and powder is thereupon deposited on the surface of the threads over a predetermined area by gravity feed. Rolling pressure is then applied to the plastic material to form the patch, packing the material between the thread flanks and confining the height of the patch to a controlled radial height above the thread crests. The controlled radial height of the patch is within the normal envelope of the basic major diameter of the fastener thread.

REFERENCES:
patent: 2738713 (1956-03-01), Buczkowski et al.
patent: 2789926 (1957-04-01), Finholt et al.
patent: 3133312 (1964-05-01), Harris et al.
patent: 3167442 (1965-01-01), Brooks
patent: 3310431 (1967-03-01), Loose
patent: 3385722 (1968-05-01), Weaver et al.
patent: 3416492 (1968-12-01), Greenleaf
patent: 3498352 (1970-03-01), Duffy
patent: 3634577 (1972-01-01), Kull
patent: 3854975 (1974-12-01), Brenneman et al.
patent: 3958039 (1976-05-01), Yabuki et al.

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