Title:
常開防火扉
Document Type and Number:
Japanese Patent JP6524034
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a normally-opened fire door for making it possible to smoothly perform door closing at the time of fire occurrence.SOLUTION: A normally-opened fire door 10 includes: a decompression aperture 12; a decompression door 14 attached so as to close the decompression aperture 12, the decompression door made to be capable of rotating around a second axial line D in parallel with a pivot (first axial line) C of the normally-opened fire door; and a decompression door closer 31 for making the decompression door 14 be at a door closing position. The second axial line D is located at a position where when the normally-opened fire door 10 pivotally moves around the first axial line C to perform door closing, an angular moment around the second axial line D generated at the decompression door 14 following movement of door closing, the angular moment being equal to or larger than a predetermined value, rotates the decompression door 14 against energization force of the decompression door closer 31 to open the decompression aperture. When the normally-opened fire door 10 stops at the door closing position, the decompression door 31 is closed by the decompression door closer 31.SELECTED DRAWING: Figure 2
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Inventors:
Masami Konno
Takayuki Kurusu
Takayuki Kurusu
Application Number:
JP2016139520A
Publication Date:
June 05, 2019
Filing Date:
July 14, 2016
Export Citation:
Assignee:
Nitto Kohki Co., Ltd.
International Classes:
A62C2/06; A62C2/12; E05F1/12; E06B5/16; E06B7/09
Domestic Patent References:
| JP2011101739A | ||||
| JP7259407A | ||||
| JP2013177803A | ||||
| JP2002272866A | ||||
| JP473194U | ||||
| JP2016188486A |
Attorney, Agent or Firm:
Shigeru Ito
Yusuke Ebi
Yusuke Ebi