Receptacles – Closures – Superposed closures for common opening
Patent
1985-05-07
1986-03-11
Hall, George T.
Receptacles
Closures
Superposed closures for common opening
220256, 220314, B65D 4316, B65D 4318, B65D 5118
Patent
active
045749736
ABSTRACT:
An entrance doorway for electrostatic precipitators, bag houses, scrubbers, ductwork and breeching includes an interior metal plate door hinged to a frame plate of similar thickness whereby the interior door and frame plate will follow any warpage of the casing wall as they are subjected to the same temperatures as the casing wall. A hollow core high temperature acid-resistant resilient gasket is employed between the interior door and its frame plate. A pressure screw acting on the center of the interior door flexes it toward the interior of the casing and renders the interior door concave to form a tight seal with the gasket. An interior door retractor is provided to pull the interior door and its gasket away from the frame plate when the pressure screw is relieving pressure on the interior door, thereby preventing damage to the door gasket. An adjustable length telescoping sleeve fixed to the interior door frame plate extends away from the interior door and supports a lightweight thermally insulated exterior door panel which is removably secured by corrosion-resistant latches. The door system eliminates air infiltration and corrosion.
REFERENCES:
patent: 2105248 (1938-01-01), Johnson
patent: 4127215 (1978-11-01), Morrison
Hudson J. Albert
Lewis, Jr. Robert L.
Environmental Products & Services Co., Inc.
Hall George T.
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