Air duct section having a connecting flange formed by bending up

Details Air duct section having a connecting flange formed by bending up Air duct section having a connecting flange formed by bending up

1988-04-04

1989-09-12

Reese, Randolph A.

Pipe joints or couplings

Flange

Clamped

285406, 285405, 285424, 138155, 138109, 138DIG10, F16L 2300

Patent

active

048653659

ABSTRACT:
The end of a duct section having flat sheet metal plates is bent up to form connecting flanges having an essentially hollow closed profile. Flange walls of the connecting flanges bearing the free edges of the duct section are lock-seamed into folding pockets which are formed between the duct wall and the adjoining flange wall. To connect duct sections having larger duct cross-sections, the flange walls can have outwardly extending protrusions for reinforcement.

REFERENCES:
patent: 3170544 (1965-02-01), Kinkead et al.
patent: 4252350 (1981-02-01), Smitka
patent: 4304423 (1981-12-01), Mez
patent: 4542923 (1985-09-01), LaCrosse et al.
patent: 4564227 (1986-01-01), Murck
patent: 4566724 (1986-01-01), Arnoldt et al.
patent: 4579375 (1986-04-01), Fischer et al.
patent: 4739802 (1988-04-01), Meinig

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