| 摘要 |
<p>An improved steel rolling door (3) is equipped with a number of pivot plates (52) which are engaged with each other side by side and pivotally associated with one side of the topmost collapsible door plate (32), and a plurality of pulling wires (53) which are engaged with the opposite side thereof so as to permit the collapsible door plates (32) to be adjusted from a horizontal position to a vertical position, i.e., from an opening position to a closing position, or vice versa. Moreover, the door plates (32) are consecutively connected to each other one by one by way of a plurality of linking pieces (33) and length variable linkage assembly units (34) each including a pair of pivot parts (341) and a connector (342) so that the door plates (32) can be easily and smoothly collapsed and rolled up along a rolling shaft (51) without getting stuck in operation. <IMAGE></p> |
