Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1998-04-03
1999-04-27
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411386, 411426, F16B 2500, F16B 3504
Patent
active
058972803
ABSTRACT:
A self perforating (punching) and thread forming connecting element such as a screw having a screw shaft 2 and screw tip 6 which tapers to a pointed end 4 as well as a single or multiple thread 8 which extends at least partially along the screw shaft 2 and along the screw tip 6 to the pointed end 4. This screw tip 6 has an essentially polygonal cross section along at least a partial region of its axial length and the thread 8 is constructed as a radially raised portion which has a helical shape with an outer thread edge 8a which, when viewed in an axial projection, forms a spiral in the region of the screw tip 6 as the radius of the thread becomes smaller and in the region of the screw shaft 2, the outer thread edge 8a proceeds with a constant radius in the form of a circle.
REFERENCES:
patent: 3180126 (1965-04-01), Carlson
patent: 3246556 (1966-04-01), Phipard, Jr.
patent: 4194430 (1980-03-01), Muenchinger
A-Z Ausrustung und Zubehor GmbH & Co. KG
Wilson Neill
LandOfFree
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