| 摘要 |
<p>The door is raised vertically by a drum (14), driven by an electric motor, which activates operating links fastened to the door. The motor is coupled to an intermediate plate (34), which has a predetermined rotational play, on the drum fixed support (20). A pawl (36), mounted near the drum and coupled to the intermediate plate, pivots into a predetermined position to engage a stop (28) when the intermediate piece is rotated consecutively consequent to a failure of the door retainer. The fixed support forms a bearing for the shaft (16) to which the drum is fixed. The intermediate plate, which is located in an axial extension of the shaft, has rectangular holes (38) in which guide bolts (40) are engaged. A spring (48) between the fixed support and intermediate piece assists the latter into a stable position when the pawl is distanced from the stop.</p> |
