| 摘要 |
PURPOSE: A fireproof hinge device of an automatic opening and closing door is provided to enable the door to be closed automatically by the heat of a fire, thereby preventing the spread of the fire. CONSTITUTION: The fireproof hinge device of an automatic opening and closing door comprises a housing(200) that the upper end thereof is fixed to a hinge bracket(100) near the door; a lifting shaft installed to be raised and exposed elastically by a compression spring(300), the exposed upper end thereof is fixed to a sliding jaw(132) portion projected downward from the hinge bracket during the rotation of the hinge bracket; a coupler(500) supporting the lower end of the compression spring, the coupler being formed with a wedge portion(510) that an outer diameter thereof being reduced gradually toward the bottom thereof; and a locking device(600) for making the coupler being fixed out of the housing with the spring being compressed and for lowering the coupler on fire.
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