| 摘要 |
PURPOSE: A door release for a fire door is provided to rapidly cut off a fire door by operating a driving motor in fire in order to minimize life loss and property damage due to fire. CONSTITUTION: A door release for a fire door comprises a main body(10), a driving motor(20), a controller(25), a housing(30), an actuating holder(40), a ring holder(50), a top case, and side cases. The main body comprises an inserting hole(10h) in which a ring unit of a fire door is inserted. The driving motor is operated by electrical signals at the outer surface of the main body. The controller allows the driving motor to rotate forward and backward. The housing is moved up and down by the operation of the driving motor. The actuating holder comprises an actuating plate(43) on which an actuating pin(44) is formed and an actuating torsion spring. The actuating torsion spring applies elasticity to the actuating plate in order to rotate the actuating plate and to fix the location of the actuating plate. The ring holder comprises a ring torsion spring(50s) for fixing the location of a ring plate(53) while rotating the ring plate. The top case covers the upper part of the main body. The side cases cover both sides of the main body. |
