Methods of constructing a one-piece roof vent device

Details Methods of constructing a one-piece roof vent device Methods of constructing a one-piece roof vent device

1980-07-25

1983-02-01

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With metal deformation of different type

72379, B21D 5116

Patent

active

043708765

ABSTRACT:
A unitary metal vent apparatus for securement to the roof of a building is formed from a single aluminum disk, into the form of a first flange portion, a tubular second portion, a cap-shaped third portion, and a vent hole portion disposed between the tubular portion and the cap portion. Preferably, the apparatus is produced by spinning a tubular protrusion in an aluminum disk, drilling vent holes, and collapsing the end of the tubular protrusion to form a cap-shaped portion.

REFERENCES:
patent: 134938 (1873-01-01), Seymour
patent: 1502944 (1924-07-01), Earhart
patent: 2754785 (1956-07-01), Zatko
patent: 3120206 (1964-02-01), Sporck
patent: 3825402 (1974-07-01), Duperow et al.
patent: 3845903 (1974-11-01), Runninger
Heating, Ventilating, Air Conditioning Guide 1960, ASHRAE, pg. 251, Ammerman "RC" Roof Relief Exhauster, Scientific Library #TH, 2701, H6.

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