Access door construction

Details Access door construction Access door construction

1984-02-27

1986-02-25

Bryant, III, James E.

Pipes and tubular conduits

With closures and plugs

Lateral opening

220240, 49475, F16L 5510, F16L 5516

Patent

active

045722404

ABSTRACT:
An access door which covers and seals an access opening in a ventilating duct. The edge of the access opening is strengthened by a dual density gasket having a U-shaped hard portion which is applied to the duct edge. A softer sealing element projects from the hard portion of the gasket and is sealed against from the inside by the door so that the duct pressure enhances the seal. The door is a sheet metal panel having a stepped configuration and a peripheral flange for contact with the seal elements. The door is held over the access opening by retainer straps having adjustment screws.

REFERENCES:
patent: 671514 (1901-04-01), Grinsted
patent: 2278881 (1942-04-01), Jacocks
patent: 2330742 (1943-09-01), Poupitch
patent: 2457066 (1948-12-01), Pepersack
patent: 3211322 (1965-10-01), Collons
patent: 3378956 (1968-04-01), Parks et al.
patent: 3509592 (1970-05-01), Schrock
patent: 3724505 (1973-04-01), Jahn
patent: 3883993 (1975-05-01), Pullan
patent: 4095640 (1978-06-01), Beckerer
patent: 4202463 (1980-05-01), Mogler

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