| 摘要 |
A description is given of a door opener for a door having a door leaf mounted such that it can be moved in or on a door frame. An electrically operatable actuating device with a self-locking electric motor (12) with a linear output drive (121) and also an actuating mechanism, which can be controlled by the electric motor (12), are provided in order to actuate a bolt (11) from the unlocking position into the locking position. The electric motor (12) is designed such that it can be displaced, along its longitudinal axis, from a rear position into a front position, and it can be fixed in the front position by an electromagnetic device (13, 17, 19). A motor-restoring spring (16) is arranged between the housing of the electric motor (12) and a stop (14a), which is mounted on the door-opener housing. |
