| 摘要 |
<p>A door opener for closed and open circuit current operation has a door opener latch, switchover means mounted to move in a first rotary bearing for blocking and releasing the latch, armature adjustable about a second rotary bearing for blocking or releasing the switchover means, electromagnet for adjusting the armature, and restoring spring moving the armature to an inoperative position when the electromagnet is in the unenergized state. The switchover means has a blocking cross section facing the armature, and an adjacent release cross section recessed behind the blocking cross section. The armature has a plate-like design and a blocking recess in the central section merging with a slot-like release recess in the end section averted from the second bearing, the blocking cross section corresponding to the blocking recess and the release cross section corresponding to the release recess. The vertical distance between the first and second bearings is variable.</p> |
