Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Washer adjacent head and having a particular shape or...
Patent
1978-11-06
1981-04-14
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Washer adjacent head and having a particular shape or...
339269, 411415, 411416, 411533, F16B 4100, H01R 716
Patent
active
042614023
ABSTRACT:
A self-tapping, self-captivating fastener is provided for engagement in a predrilled aperture to enable the connection of an electrically conductive element such as a lead wire, or spade type terminal attached to the end of such a wire, to a workpiece or bus bar. The fastener includes a shank and an enlarged driving head, said shank having a threaded portion which includes a thread lead-in portion that tapers and converges in a direction away from the driving head toward an enlarged abutment projection formed at the work entering end of said fastener. The diameter of this abutment projection is less than the diameter of the predrilled aperture and said apertural diameter is less than the crest diameter of the threaded portion. Thus the abutment portion may pass through this aperture with said threaded portion reshaping the periphery of the aperture to form internal mating threads, such that the apertural diameter is reduced to less than that of the abutment portion. Accordingly, upon withdrawal of the thread, said abutment portion will impinge upon the internal threads thereby rendering said fastener captive. In addition, the convergence of said thread lead-in portion is such that when said abutment portion impinges the internal threads, the thread turns upon the lead-in portion are not in contact with said internal thread whereby continued rotation of the fastener will not damage the internal threads.
REFERENCES:
patent: 2053918 (1936-09-01), Peretzman
patent: 3372366 (1968-03-01), Cochrum
patent: 3638700 (1972-02-01), Onufer
patent: 3877339 (1975-04-01), Muenchinger
patent: 4040328 (1977-08-01), Muenchinger
Britts Ramon S.
Textron Inc.
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