Threaded – headed fastener – or washer making: process and apparat – Process – Making externally threaded fastener – e.g. – screw or bolt
Patent
1995-01-20
1996-10-29
Larson, Lowell A.
Threaded, headed fastener, or washer making: process and apparat
Process
Making externally threaded fastener, e.g., screw or bolt
411 40, 411 57, B23G 900, F16B 1304
Patent
active
055690912
ABSTRACT:
The expansible metal anchor (1) for anchoring in a hole drilled in a component includes a shank part (2) and an expander cone (4) having a polygonal cross-section defining several faces (13) at its front end. On each face (13) of the expander cone (4) an expansible segment (5) is arranged spaced from that face by a gap (7) corresponding approximately to the distance (8) by which the expansible segments (5) project radially from the shank part (2). Each expansible segment (5) is joined to the shank part (2) at its end face directed towards the shank part (2) by web members (6, 6') constituting predetermined break points. As the expansible anchor is driven into the hole drilled in the component, the web members (6,6') break off, so that the expansible segments (5) are displaceable on the faces (13) of the expander cone. The expansible anchor (1) is manufactured from powdered metal by an injection-molding process using a system of binders with subsequent removal of the binders and sintering, and a slide member of the mold divided at the corner edges (20) of the faces (13) is used to make the gap (7) between the expansible segments (5) and the faces (13) of the expander cone (4).
REFERENCES:
patent: 3750526 (1973-08-01), Lerich
patent: 4011786 (1977-03-01), Liebig
patent: 4074609 (1978-02-01), Busler
patent: 5419664 (1995-05-01), Hengesbach et al.
Haage Manfred
Hein Bernd
Plocher Bernd
Seibold Guenter
Weber Wilfried
Fischerwerke, Artur Fischer GmbH & Co KG
Larson Lowell A.
Schoeffler Thomas C.
Striker Michael J.
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