Metal working – Expanded metal making
Patent
1991-09-04
1993-04-06
Eley, Timothy V.
Metal working
Expanded metal making
72203, B21D 3104
Patent
active
051991420
ABSTRACT:
The opposite edge portions and the center portion of a continuous strip of sheet metal are progressively sheared with longitudinally spaced and laterally extending slits to form opposing U-shaped tabs having corresponding edge portions and successively connected by corresponding center portions of the strip. The sheared strip is fed between first and second overlapping sets of power driven pinch rollers which progressively grip the edge and center portions, respectively, and the second set of pinch wheels is longitudinally offset and driven at a higher peripheral speed to produce precisely uniform expansion of the strip by deforming the U-shaped tabs into V-shaped tabs. A hot melt adhesively impregnated flexible filament is progressively attached to the expanded portions of the strip while the strip is heated, and the expanded strip is progressively formed into a channel which is fed into an extrusion head for producing a reinforced rubber-like weatherstrip.
REFERENCES:
patent: 1267978 (1918-05-01), Collinson
patent: 2290842 (1939-07-01), Bush
patent: 4305187 (1981-12-01), Iwamara et al.
patent: 4921118 (1990-05-01), Gass
Eley Timothy V.
The Gem City Engineering Co.
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