| 摘要 |
PURPOSE: A fire door closer is provided to enable a user to appropriately adjust the closing speed of the fire prevention door and increase the strong closing force of the fire door. CONSTITUTION: A fire door closer comprises a housing(10), a power transmission device, and a door deceleration device. The housing comprises a first interlocking arm(C1) and a second interlocking arm(C2). The housing is installed on the top of a door frame(P) of a building. The power transmission device is installed inside the housing. The power transmission device presses a fire door(D) to the door frame at the outbreak of fire. The door deceleration device is connected to the power transmission device. The door deceleration device reduces the speed of the fire door which is being closed at the outbreak of fire. |
