TODAY’S TRADEMARK – METHOD OF MAKING SELF-LOCKING THREADED ELEMENTS
This invention “Method of making self-locking threaded elements” was invented by Richard J. Duffy and assigned to Nylok LLC Michigan National Bank of Detroit, was granted patent on 18th May, 1976 by the USPTO bearing patent grant number USRE28812E to the patentee. The current invention relates to a method of creating a self-locking threaded element, such as a screw, that includes a firmly adhered convexly curved plastic body on its threaded surface, allowing for easy assembly and providing a strong frictional engagement between the element and a mating threaded surface.
In order to aid in the deposition of the plastic particles during manufacturing and to provide superior adhesion between the fastener surface and the retarder patch, a thin, heat-softenable film of primer or tying material may be provided on the chosen area between the surface of the fastener or bolt and the retarder patch. Contacting particles are attracted to the heated surface, where they are fused by the element’s heat to create a continuous plastic body that is subsequently solidified by cooling.