| 摘要 |
<p>A door assembly (1) for a door includes a pair of mounting plates (10,10') fixedly attached to two lateral sides of the door and near a top thereof. An axle (20) is fixedly mounted to the mounting plates (10,10') and extends therebetween. A drive wheel (22) and an idling wheel (22') are rotatably mounted on the axle (20). Each of the drive and idling wheels (22,22') defines a series of teeth on its circumferential periphery. An arc-shaped guiding channel (12) is defined on each of the mounting plates (10,10'). A horizontal guiding channel (40) is extended from the arc-shaped guiding channel (12) toward an inside of the door. A vertical guiding channel (42) is extended from the arc-shaped guiding channel (12) toward a bottom end of the door. A door shutter (30) which is made of a single spring steel sheet and formed to have a corrugated/ribbed configuration has two lateral sides inserted into and guided by the guiding channels (12,40,42) and is engaged with some of the teeth of the drive and idling wheels (22,22') so that when the drive wheel (22) rotates, the door shutter (30) is moved. <IMAGE></p> |
