| 摘要 |
PROBLEM TO BE SOLVED: To provide a normally closed smoke-insulating fire door device with a speed regulating function, having four hanging wheels on one side. SOLUTION: The fire door of a simple structure comprises a guide rail of a substantially C-shape in cross section disposed to tilt and the four hanging wheels disposed on one side to hang the fire door to automatically close. The fire door further comprises an automatic-closing speed regulating device. When an opening part is automatically closed, the fire door is pressed against an opening part side by a pressing means upon complete close of the door so that the smoke may also be prevented from flowing out by providing a smoke insulation member on a periphery of the opening part side in advance. COPYRIGHT: (C)2005,JPO&NCIPI
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