Adjustable roof jack

Details Adjustable roof jack Adjustable roof jack

1984-08-02

1985-07-02

Joyce, Harold

Pipe joints or couplings

With casing, lining or protector

Insulated

285 44, 285424, F24F 1302, E04B 718

Patent

active

045260915

ABSTRACT:
The invention comprises an economical, adjustable roof jack for connecting a roof mounted air handler to an air duct therebelow, wherein a single sheet metal pattern comprises a portion of a lower and upper section of duct and wherein the duct sections are connected, each to the other, by means of a sheet metal bend hinge in the single sheet metal pattern thereby allowing adjustment of the angle between the upper and lower duct sections and providing a water and weather tight seal along the hinge line therebetween.

REFERENCES:
patent: 1370199 (1921-03-01), Downs
patent: 1804954 (1931-05-01), Rutherford
patent: 3742659 (1973-07-01), Drew

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