Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1982-01-25
1984-09-11
Gilden, Leon
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411187, 411188, 411427, 220214, B21D 2200
Patent
active
044707363
ABSTRACT:
This invention relates to a bushing structure having a bushing (1) and a polygonal flange (2) said flange initially being formed with a circular circumference (5) having an outer diameter equal to the diameter of the inscribed circle (14) of the polygon to be made whereafter by means of cold deformation the material of the flange at the location of the angles of the polygon to be made is forced to flow outwards by means of a die pressed into the flat surface of the flange, the die having projections, the inner surfaces of which are steep with respect to the axis of the die and the bottom surface of which run obliquely and arching by upwards and outwards the radial width of said projections decreasing from the center to both sides.
REFERENCES:
patent: 28212 (1898-01-01), Biedenfeld
patent: 1905621 (1933-04-01), Cole
patent: 2539899 (1951-01-01), Delaney
patent: 2551102 (1951-05-01), Delaney
patent: 2939160 (1960-06-01), Mitchell
Gilden Leon
Koninklijke Emballage Industrie Van Leer B.V.
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