Making of self-locking internally threaded fasteners

Details Making of self-locking internally threaded fasteners Making of self-locking internally threaded fasteners

B - Operations, Transporting

23

G

10/22

B23G 9/00 (2006.01)

Patent

CA 1051619

A B S T R A C T Apparatus for making a self-locking internally threaded fastener having a ring-like plastic patch having a circumferential extent greater than 180° 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°. 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 deposit- ing the plastic powder upon at least a portion of the thread- defining 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.

301024

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