Method of manufacture of ventilated sheet metal floor members

Details Method of manufacture of ventilated sheet metal floor members Method of manufacture of ventilated sheet metal floor members

1981-07-27

1983-12-06

Larson, Lowell A.

Metal deforming

By deflecting successively-presented portions of work during...

By use of deflector arranged to bend work transversely of...

72186, 72187, 72196, 52303, B21D 3500

Patent

active

044185588

ABSTRACT:
Multi-aperture ventilated floor members, for use in a grain bin or like applications, are formed from continuous sheet metal strip stock, complete, in one pass through a cold roll forming machine, in a method in which the critical steps comprise roll-lancing the metal strip to form multiple closed slits transversely of the length of the strip and then roll corrugating the strip transversely of its length to widen the slits into narrow open ventilation slots by stretching the metal, simultaneously ironing out the projections formed when the slits are lanced into the strip.

REFERENCES:
patent: 547952 (1895-10-01), Hayes
patent: 2313533 (1943-03-01), Gersman
patent: 2818009 (1957-12-01), Steffen
patent: 3293725 (1966-12-01), Gunter et al.
patent: 3842647 (1974-10-01), Knudson
patent: 3861009 (1975-01-01), Baxter
patent: 4068366 (1978-01-01), Hillesheim

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