| 摘要 |
<p>A motorized vent and escape hatch assembly (10) has a mounting ring (12) fastened to a vehicle roof around a hatch hole, and a hatch cover (14) that is attached to the mounting ring by a first over center hinge linkage mechanism (16) pivotally connecting one side of the hatch cover to the mounting ring and a second over center mechanism (18) pivotally connecting an opposite side of the hatch cover to the mounting ring. Each over center hinge linkage mechanism has first and second lever members (52, 54) pivotally connected to the mounting ring at one end, first and second plungers ( 56, 58) that are connected to the respective first and second lever members at the opposite end and that extend into opposite ends of a tube (60) that is connected to the hatch cover. A compression spring (84) in the tube biases the first and second plungers away from each other. Each over center hinge linkage mechanism is associated with a drive mechanism (24, 26, 28, 30) that pivots the first and second lever members toward or away from each other to raise or lower its side of the hatch cover with respect to the mounting ring. Each drive mechanism includes first and second gear housings (68) attached to the mounting ring, first and second gear sets (72) disposed inside the respective gear housings, first and second electric motors attached to the respective gear housings for driving the first and second gear sets, and first and second output shafts (74) that are driven by the first and second gear sets and that extend out of the first and second gear housings respectively with the first and second lever members being keyed to the first and second output shafts respectively. The gear sets are compound gear trains that reduce speed and increase torque. <IMAGE></p> |
