| 摘要 |
<p>The lever mechanism is used for opening and closing the control flap, ventilator, or fanlight and has a pair of scissor-type lever arms (10,20a,20b) which are pivoted together and an actuator in the form of a spindle rod (41) incorporated in one of the lever arms. The spindle rod is rotated by an electric setting motor and applies an opening force between the lever arm via one or a pair of coupling rods (30a,30b), completely covered by the lever arm in the closed position.</p> |
