| 摘要 |
PURPOSE: A floor hinge capable of closing a door in an emergency is provided to use the floor hinge as a fire door by automatically closing a door depending on an external signal. CONSTITUTION: A floor hinge comprises a cam, a piston(130), and a restoring spring(170). The cam is installed inside a casing(100), and controls rotation angle of a door by being hung on a hanging roller. The piston is moved back and force by rotation of the cam, and slows an opening and closing speed of the door. The restoring spring restores the door by movement of the piston. |
