Metal working – Means for forming clench-tongue
Patent
1986-11-19
1988-06-28
Eley, Timothy V.
Metal working
Means for forming clench-tongue
294321, 29521, 29522R, 29525, 411103, 411177, B23P 1900
Patent
active
047529938
ABSTRACT:
A fastener and method of attachment of such fastener to sheet material to provide attachment of a tubular fastener to the sheet material by extruding, without severing, portions of the sheet material completely through openings on the base portion of the fastener. In one embodiment of the invention, the extruded material is clinched on the top surface of the base portion by clinch members integrally formed with the base portion. The fastener is internally threaded, lightweight and preferably heat-treated prior to attachment to the sheet material to provide fastener strength equivalent to or greater than that of much heavier nuts. Two types of such fasteners may be attached by a method which opens up a hole in the sheet material of a larger diameter than the major diameter of the threads in the fasteners while simultaneously clinching the fastener in place. This eliminates the need to use thread-cutting bolts. The fasteners may be connected together to form a strip to be fed into an automated assembly unit from a dispenser. In another embodiment of the invention, the extruded material is clinched on the top surface by extruding it through clinch openings into the cavities of a die member that is brought into contact with the top surface of the fastener, each such cavity being aligned with and being somewhat larger than the clinch opening of the fastener that it is adjacent to.
REFERENCES:
patent: 2385851 (1945-10-01), Swanstrom
patent: 2948316 (1960-08-01), Siag et al.
patent: 3704507 (1972-12-01), Grube
patent: 3829957 (1974-08-01), Pouch et al.
patent: 3878598 (1975-04-01), Steward
patent: 3926236 (1975-12-01), Pouch et al.
patent: 4658502 (1987-04-01), Echold et al.
Eley Timothy V.
VanOphem Remy J.
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