| 摘要 |
1,214,838. Locking; nuts and bolts. USM CORP. 4 Dec., 1967 [5 Dec., 1966; 5 April, 1967], No. 55004/67. Heading F2H. [Also in Divisions B1-B2] A threaded fastener element 10 is provided with self-locking means comprising a patch of tough, resilient plastics material 12 on a threaded portion, which is formed by directing a stream of resin particles from a jet 42 on to the selected portion of the preheated threaded element 10 while this is being carried by conveyer 25. The resin adheres, melts, and on cooling forms a continuous patch which extends further circumferentially at the crowns than it does at the roots. The resin may be a polyamide or polyester such as nylon and to improve adhesion, a primer material such as a solution of a polyamide, epoxy or resorcinol aldehyde resin may be used.
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