| 摘要 |
PURPOSE: A fireproof auto-closing door hinge is provided to block a flame and gas by closing a door automatically at a fire. CONSTITUTION: The fireproof auto-closing door hinge contains: a flow control unit(200) fixed to a hollow of a primary cam(121) to control the flow of a fluid passing through the hollow of the primary cam(121); a rotary block(165) formed in the middle of a rotary shaft(160) and coupled with the inside of a housing(110); a nut(168) fastened to the other end of the rotary shaft(160); a fuse unit(300) located between a ratchet block(180) and a nut to cover up the rotary shaft(160) and dismantled at the appointed temperature; and a bearing pin(170) located between a secondary cam(122) and a ratchet block(180).
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