Method and apparatus for making self-locking fasteners
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United States of America Patent
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Jan 2, 1990
Grant Date -
N/A
app pub date -
Feb 21, 1989
filing date -
Feb 21, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making locking threaded fasteners having on the threaded surfaces thereof locking patch material formed by the accumulation of fused thermoplastic resin particles. The fasteners are advanced through a heating zone followed by an application zone. The fasteners are heated while in the heating zone to a temperature sufficient to fuse thermoplastic resin particles received on the threaded surfaces in the application zone. Thermoplastic resin particles are applied to the fasteners in the application zone by a mechanical propelling device which comprises a rotatable slinger that propels the particles by centrifugal force against the heated threaded surfaces. The thermoplastic resin particles build up on the threaded surfaces and fuse into locking patches. Apparatus for carrying out the method is also disclosed.
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