Method for making self-locking internally threaded fasteners wit

Details Method for making self-locking internally threaded fasteners wit Method for making self-locking internally threaded fasteners wit

1975-12-05

1976-08-24

Larson, Lowell A.

10 10P, B21D 5324, B21K 164

Patent

active

039757870

ABSTRACT:
A self-locking internally threaded fastener in which the self-locking characteristic is derived from a ring-like plastic patch having a circumferential extent of greater than 180.degree. adhered to the thread-defining surface of the fastener. A method for making the fastener includes seating a fastener upon a pin having a configuration which establishes a cavity between the pin and the fastener, placing an initial deposit of plastic powder in the cavity and then re-distributing the plastic powder, as by blowing, to form a ring-like deposit which can be heated until fused to establish the desired ring-like patch. An apparatus includes a pin having a seating shoulder and a frusto-conical tapered portion for receiving the fastener and establishing the cavity.

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patent: 3294139 (1966-12-01), Preziosi
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patent: 3568746 (1971-03-01), Faroni et al.
patent: 3720533 (1973-03-01), Gallagher
patent: 3766584 (1973-10-01), Dorflinger
patent: 3830902 (1974-08-01), Barnes

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