Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1992-07-10
1993-12-28
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
411180, 411413, 411424, 411930, F16B 3930, F16B 3504
Patent
active
052733831
ABSTRACT:
A fastener has multiple secondary threads intertwined with a primary thread installable in a thermoplastic workpiece. A method and die are arranged for fabricating such a fastener. The fastener comprises a threaded shank portion having a primary thread of a desired form and a driver head attached thereto. At least one secondary thread is intertwined with the primary thread. In accordance with one embodiment of the invention, an outer surface of the fastener may be heated to a preselected Curie temperature during the installation of the fastener into a workpiece. The preselected Curie temperature enhances the flow of the thermoplastic material around the fastener while the fastener is being installed in the workpiece. A coating material having a particular desired Curie temperature may be applied to the fastener to produce desired driving characteristics. The heating of the fastener through Curie temperature heating reduces the drive torque and promotes plastic flow of the thermoplastic around the fastener without adversely affecting the physical characteristics of the thermoplastics material. Rolling dies having a novel rolling face are used to produce the fastener in a single rolling operation such that the formation of the primary and secondary threads can be accomplished without the one interfering with the other during formation.
REFERENCES:
patent: 4046181 (1977-09-01), Barnsdale
patent: 4164971 (1979-08-01), Strand
patent: 4508759 (1985-04-01), Wallace
patent: 4941788 (1990-07-01), Highfield
Research Engineering & Manufacturing, Inc.
Wilson Neill R.
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