| 摘要 |
<p>Apparatus for making a self-locking internally threaded fastener having a ring-like plastic patch having a circumferential extent greater than 180.degree. adhered to the thread-defining surface of the fastener. The apparatus comprises a pin having a cavity-forming portion, and means for seating the fastener upon the pin to define a cavity having a circumferential extent greater than 180.degree.. The pin has a terminal end, a generally cylindrical shoulder portion extending axially along the pin and a frusto-conical surface portion tapered from a larger diameter juxtaposed with the shoulder to a smaller diameter at the terminal end of the pin. The apparatus also includes means for depositing the plastic powder upon at least a portion of the threaddefining surface within the cavity, means for subsequently re-distributing the plastic powder within the cavity and means for heating the fastener to fuse the deposited and distributed plastic powder.</p> |
