Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1988-09-08
1989-11-07
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
411399, 411413, F16B 2300, F16B 2500
Patent
active
048787930
ABSTRACT:
A screw threaded fastener particularly intended for use in fastening corrugated sheet material to metal purlins comprises a drilling point (1), a head (2), a first self-tapping screw threaded portion (3) adjacent the drilling point (1), a second screw threaded portion (4) adjacent the head (2), the second screw threaded portion (4) having a larger crest diameter than the first screw threaded portion (3), and an unthreaded portion (5) extending between the first and second screw threaded portions. The diameter of the part of the fastener carrying the second screw threaded portion (4) is generally larger than that carrying the first screw threaded portion (3) and the fastener also includes a transition portion (6) between its portions of smaller and larger diameter and in particular, interposed between the trailing edge portion of the first screw threaded portion (3) and the leading edge portion of the unthreaded portion (5). The transition portion (6) includes forming portions (8) projecting outwardly from the axis of the fastener no further than the diameter of the larger diameter portion. The forming portions (8) in use, enlarge the diameter of a hole drilled within the sheet material by means of the drilling point (1) so as to allow passage of the larger diameter portion of the fastener through the sheet material. Such a fastener is formed by means of a forward extrusion step which reduces its diameter and which, simultaneously, forms the forming portions (8) upon the transition portion (6).
REFERENCES:
patent: 3478639 (1969-11-01), Gruca
patent: 3682507 (1972-08-01), Wand
patent: 4621963 (1986-11-01), Reinwall
patent: 4655661 (1987-04-01), Brandt
ITW Ltd.
Wilson Neill R.
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