| 摘要 |
<p>Method of making a self-locking threaded element, e.g. a screw, including a strongly adhered plastic body or locking patch on its threaded surface where the locking patch is formed with a special configuration for effective locking engagement over a wide range of clearances between the element and mating threaded surfaces, in which method a stream of fine particles of heat softenable resin is directed against a threaded surface portion of a heated metallic element at a temperature lower than that effective to form a continuous convex curved deposit of resin. The threaded portion is kept in the stream of resin particles for a time sufficient to fill the valleys between threads to an extent of at least one-third in areas of the valleys adjacent the central line of the locking patch and to form thin resin deposits in areas spaced from the central line to give in effect an interupted ridge or bar useful to provide locking action over a wide range of clearances.</p> |
