Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1975-10-16
1976-09-21
DiPalma, Victor A.
Metal working
Method of mechanical manufacture
Assembling or joining
29200B, 29521, 113 1M, 113116FF, B23P 1100
Patent
active
039810640
ABSTRACT:
A punch and press mechanism is used to interlock two or more overlying sheets of metal, or other material having plasticity or deformable properties, by partially piercing and deforming minor areas of the sheets. The mechanism includes a pierce-and-forming punch, a hollow cylindrical die, and a flattening punch. The die cavity is aligned with, and cooperates with, the pierce-and-forming punch to displace minor areas of the sheets. The flattening punch is slidably movable within the central bore of the die. Adjustment means are included so that the position of the die relative to the flattening punch may be so adjusted that compressive force is applied to the upper displaced minor area at a time when the lower displaced minor area is not confined by the die, whereby the lower displaced minor area is spread while the upper minor area is still constrained. To reduce the extent to which the displaced minor areas project above the major areas of the sheets, the edge portions of the major areas adjacent the piercings or cuts may be bent downwardly. To reduce or eliminate the amount of light or liquid, such as water, which can pass through the interlocking joint, a small portion of the lower displaced minor area may be left in the slot formed by the piercings and displacements.
REFERENCES:
patent: 2254558 (1941-09-01), Williams
patent: 2671361 (1954-03-01), Sandberg
patent: 3470596 (1969-10-01), Belada
patent: 3599318 (1971-08-01), Behlen
patent: 3726000 (1973-04-01), Hafner
patent: 3791016 (1974-02-01), Eberhardt et al.
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