Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1989-06-05
1990-10-30
Combs, E. Michael
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
10 10R, 10 27E, B21H 302, B21D 1704
Patent
active
049660241
ABSTRACT:
A screw threaded method of making 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 FIG. 4) projecting outwardly from the axis of the fastener no further than the diameter of the larger diameter portion. The forming portion (8) in use, enlarge the diameter of a hole drilled within the sheet material by mean 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 mean of a forward extrusion step which reduces its diameter and which, simultaneously, forms the forming portions (8) upon the transition (6) portion.
REFERENCES:
patent: 1855372 (1932-04-01), White
patent: 3478639 (1969-11-01), Gruca
patent: 3682507 (1972-08-01), Waud
patent: 3683436 (1972-08-01), Reiland
patent: 4534690 (1985-08-01), Barth
patent: 4621963 (1986-11-01), Reinwall
patent: 4655661 (1987-04-01), Brandt
patent: 4724694 (1988-02-01), Medal
Combs E. Michael
ITW Ltd.
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