THREAD FORMING FASTENER

Title:

THREAD FORMING FASTENER

Document Type and Number:

WIPO Patent Application WO1999067540

Kind Code:

A3

Abstract:

The present invention envisions a fastener and a blank (30) for forming a fastener. Threads are formed on the fastener blank (30) of the present invention to achieve the fastener of the present invention. The fastener and blank include a shank (34) which defines a central axis (36) of the fastener. A head (38) is provided on one end of the shank (34) and a leading end (40) is provided on an opposite end of the shank distal the head. A plurality of lobes (46, 48) are provided on the shank and are generally axially aligned with the central axis. Flutes (44) are defined between neighboring lobes. The plurality of lobes (46, 48) include at least three major lobes (46) and three minor lobes (48). The major lobes are defined by a major arc which is struck by a major radius. The minor lobes (48) are defined by a minor arc struck by a minor radius (78). The major and minor radii extend from different radial points of origin. An inner circle of origin (84) is positioned outwardly from the central axis and an outer circle of origin (88) is positioned outwardly from the central axis and said inner circle of origin. The minor radii extend from a point on the inner circle (84) and the major radii (76) extend from a point on the outer circle (88). Threads are formed on the outside surface of the fastener blank as described hereinabove to produce the threaded fastener of the present invention.

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Inventors:

GOSS DAVID C
LUNA DENNIS M

Application Number:

PCT/US1999/014194

Publication Date:

March 23, 2000

Filing Date:

June 22, 1999

Export Citation:

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Assignee:

TEXTRON INC (US)

International Classes:

B21H3/02; F16B25/00; F16B35/04; (IPC1-7): F16B25/00; F16B35/04

Foreign References:

US4040328A	1977-08-09
US4235149A	1980-11-25
US4368552A	1983-01-18

Other References: