Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1985-12-19
1987-04-28
Spruill, R. L.
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72396, 29432, 29509, B21D 501
Patent
active
046604030
ABSTRACT:
An improved die assembly for use with a punch is employed to produce stitch connections between sheets of rigid, deformable material. The die assembly includes an anvil body having a central anvil portion and a pair of arcuate depressions respectively on opposite sides of the central anvil. A pair of die portions are pivotally mounted on opposite sides of the anvil and include curved sections which are conjugally received within the depressions of the anvil body and function to transmit force applied by the punch through the curved sections to the anvil body, thereby relieving the pivotal connections from undue stress. The die portions and the anvil body are provided with opposing surfaces between which there are trapped coil springs for urging the die portions toward each other. In an alternate embodiment, biasing of the die portions toward each other is achieved by surrounding the die portions with a layer of molded, resilient material such as urethane. In another embodiment, the pins which pivotally mount the die portions are supported on lateral shoulders of the anvil body so that the punch force is transmitted through the pins to the anvil body.
REFERENCES:
patent: 2362006 (1944-11-01), Herzog
patent: 2619855 (1952-12-01), Williams
patent: 2671361 (1954-03-01), Sandberg
patent: 3258948 (1966-07-01), Carlson
patent: 3579809 (1971-05-01), Wolf
patent: 4459735 (1984-07-01), Sawdon
Jones David B.
Spruill R. L.
Weldex, Inc.
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