Movable or removable closures – Mounted for multidirectional or oblique movement – Initial or terminal movement transverse to sliding movement...
Patent
1986-09-24
1989-04-11
Kannan, Philip C.
Movable or removable closures
Mounted for multidirectional or oblique movement
Initial or terminal movement transverse to sliding movement...
49 1, 49223, E05D 1510
Patent
active
048193780
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a self-closing sealing structure in which, when a sliding door is completely closed, a doorway or three-sided frame is hermetically sealed to thereby prevent the passage of smoke.
BACKGROUND ART
A sliding fire door has previously been disclosed in the specifications of Japanese Patent Laid-Open No. 9858/1980 and Japanese Utility Model Publication No. 107577/1980 wherein opening of the door is accomplished by a manual operation, and closing is automatically effected with an adjustable force which varies the returning speed provided by an elastic device in order to vary the time of closing of the sliding fire door. In this door, a self-closing action begins the instant that a restraint is released by the action of a smoke sensor or a heat sensor. A suspension door provided with a self-closing function only is disclosed in the specification of Japanese Patent Laid-Open No. 123236/1979; and a sliding fire door is disclosed in the specification of Japanese Patent Laid-Open No. 138692/1984 wherein a smoke-shielding plate is perpendicularly provided toward a ceiling.
The above-described sliding fire door and suspension door, however, provide insufficient security in terms of protecting people from a fire, because they are incapable of preventing an outflow of harmful smoke when they are closed and this leads to a problem in that such doors are unsuitable for many purposes.
The aforementioned sliding fire door is unsuitable in practice since harmful smoke leaks out from a space formed between both ends of the door or in the vicinity of a suspension wheel.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention, which obviates the above-noted conventional defects, to provide an inexpensive sliding fire door (hereinafter referred to as a sliding door) having a sealing structure which provides for protection from a fire, including the smoke which is produced. This sliding fire door is arranged so that, in order to cope with an emergency caused by fire and noxious smoke spreading in advance of the fire, the sliding door may be opened manually when conditions are normal, but performs a self-closing action upon the automatic sensing of smoke or heat and comes into close contact with a three-sided passage frame to prevent the passage of smoke. Thus, not only is the spreading of the fire hindered, but also smoke-shielding effects are obtained in order to protect the people present from the smoke, which is the most dangerous factor present when a fire occurs.
The self-closing door sealing structure according to the present invention includes a first unit which provides a means for keeping the sliding door in close contact with the three-sided passage frame when the sliding door is closed. The sliding door moves toward the passage frame via inclined guide members disposed at the upper and lower portions of the sliding door as well as at a side post of the passage frame. A second unit provides means for making the sliding door press against a retractable support frame provided within the side post of the passage frame and an auxiliary frame when the sliding door is closed. The auxiliary frame is made to retract into an inverted L-shaped hook frame by inclined guide members disposed at the upper and lower portions of the sliding door. The two units, as well as the sliding door, are suspended from suspension wheels so that the structure can be rolled. The sliding door is closed by a self-closing force with a constant velocity except when being held open. The sliding door is held open by the constraint of an electromagnetic release which may be operated by a smoke sensor or heat sensor. The sliding door can only be opened manually.
Hence, according to the present invention, multiple sensors such as a smoke sensor, a heat sensor, or the like function in response to a fire which occurs at any time, so that an opening portion defined as a passage is shut off by immediately releasing the constraint on the sliding door regardless of the location of
REFERENCES:
patent: 1008774 (1911-11-01), Beard
patent: 1322732 (1919-11-01), Schatz
patent: 2145403 (1939-01-01), Nemec
patent: 2927788 (1960-03-01), Slopa et al.
patent: 3906668 (1975-09-01), Simmons
patent: 4114317 (1978-09-01), Crawley
LandOfFree
Self-closing door sealing structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-closing door sealing structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-closing door sealing structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-658055