Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Including settable material – Adhesive encapsulated
Patent
1991-04-04
1992-07-28
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Including settable material
Adhesive encapsulated
411180, 411311, 411930, 29456, F16B 3704, F16B 3902
Patent
active
051336308
ABSTRACT:
A thread-forming fastener and method of installation thereof are provided for use with a workpiece constructed of a thermoplastic material. The fastener includes a threaded shank having a thread of desired form and a driver head portion. A metallic coating of a predetermined composition is applied to the threaded shank. The composition of the coating is selected for its effective Curie temperature for heating the fastener during application of the fastener to the thermoplastic workpiece. The heated surface enhances plastic flow of the thermoplastic material during thread forming and effectively reduces the required drive torque for thread forming by the fastener while increasing the holding torque. The fastener is preferably also formed with a spaced thread defining an unthreaded surface portion running adjacent to the thread at substantially the root diameter of the thread. At least one radially outwardly extending ramp-like ratchet tooth is formed in at least one part of the unthreaded shank portion oriented for resisting rotation of the fastener relative to the workpiece.
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Research Engineering & Manufacturing, Inc.
Wilson Neill R.
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