Patch-type self-locking screw fasteners

Details Patch-type self-locking screw fasteners Patch-type self-locking screw fasteners

1988-11-08

1990-05-22

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having structure to restrict rotation of threaded, mating...

Comprising a thread lock

411258, 411903, 411930, 10 86A, F16B 3900, F16B 3934

Patent

active

049273078

ABSTRACT:
Thermoplastic polymer locking elements are formed on threaded fasteners to provide a range of self-locking torque characteristics. The thermoplastic resins are of the type that crystallize during cooling from the molten state.
The crystallizable polymers are preferably applied in film form to preheated threaded fasteners. By correlation of the preheat temperature, the length of time during which the molten polymer is allowed to melt and flow onto the thread surfaces, and the rate of cooling of the assembly, the geometry of the locking element and the degree of crystallinity of the polymer are controlled.

REFERENCES:
patent: 2680085 (1954-06-01), Raeuber
patent: 3093177 (1963-06-01), Villo
patent: 3251708 (1966-05-01), Schmetterer et al.
patent: 3351504 (1967-11-01), De Hart
patent: 3452714 (1969-07-01), Burke et al.
patent: 3498352 (1970-03-01), Duffy
patent: 3557750 (1971-01-01), Gallagher
patent: 3830902 (1974-08-01), Barnes
patent: 3893496 (1975-07-01), Wallace et al.

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