Movable or removable closures – Closure movement actuated retractable sealing – guiding or...
Patent
1988-02-11
1989-04-25
Kannan, Philip C.
Movable or removable closures
Closure movement actuated retractable sealing, guiding or...
E06B 720
Patent
active
048235091
ABSTRACT:
A self-closing door sealing structure is provided with an arrangement for keeping a self-closing fire door in close contact with a three-sided frame in a passage when the sliding fire door is closed so that no smoke or fumes may pass. A first unit is formed so that a sliding door (1) can be moved horizontally so as to be brought into close contact, when the sliding door is closed, with the three-sided passage frame via inclined guides (6) on a side post (18) in the passage frame and inclined guides (4A), (5) which are disposed at the upper and lower portions of the sliding door (1). A second unit is formed so that, when the sliding door (1) is closed, it press-contacts a retractable support frame (47) and an auxiliary frame (36). The auxiliary frame (36) is retracted into an inverted-L-shaped hook frame (32) by an inclined guide member provided behind the sliding door (1). In normal operation, the sliding door (1) is fully opened and held to enable a person to pass through the opened position. When a fire occurs, an electromagnetic release (E) is unlocked manually or by the operation of a smoke and heat sensor so that the sliding door (1) is closed automatically. Upon closing, the sealing structure is adapted to hermetically seal the three-sided frame in the passage.
REFERENCES:
patent: 1322732 (1919-11-01), Schatz
patent: 2248719 (1941-07-01), Owen
patent: 2862262 (1958-12-01), Shea
patent: 3019493 (1962-02-01), Walenga
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