| 摘要 |
<p>A locking device for a fire-inhibiting shut-off damper, which is opened and closed by means of an electric motor with spring return. The electric motor has a shaft (1), the rotational movement of which is transmitted (3) to a damper plate by means of a pivot arm (2), which has a notch (6) for a lock bolt (7) spring-biased to a locking position. The pivot arm (2) is connected to the drive shaft (1) in such a manner that the drive shaft can be rotated a predetermined angle without moving the pivot arm (2). This makes it possible to move the lock bolt (7), by means of a rocker arm (11) actuated by a segment (13), and a helical spring (10), into or out of engagement with the lock notch (6). The damper is thus, via the pivot arm (2), always locked in the closed position, i.e. when the electric motor is shut off. In order to release the damper, the electric motor must be activated so that the lock bolt (7) is moved to a position out of engagement with the lock notch (6).</p> |
