| 摘要 |
A mechanism for closing in sequence a first door (D1) and then a second door (D2) has pivot pins (40) mounted to the door frame. Each pin engages a cam plate (30), so that the plate can rotate. Linkages, such as doors arms (20) hinged from each door to the corresponding cam plate, cause the doors to close when the cam plates rotate. A pair of crossed shuttle arms (50, 60) are rotatably coupled to the cam plates. On the first cam plate the shuttle arms are fastened at a radial distance (d/2) from the pivot pin, and on the second the shuttle the shuttle arms are fastened at a greater radial distance (D/2). The two different distances cause the cam plates, as linked by the shuttle arms, to rotate at different angular rates. The door linked to the cam plate with the smaller distance closes first. The mechanism is asymmetrical with the distances from the pivots to the door arms, the lengths of the door arms, and the attachment points of the hasps on the two sides being in general unequal. The dimensions are adjusted for sequential closing of the doors.
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