| 摘要 |
Goods handling door comprising a screen 1 which can be raised and folded in concertina folds, stiffened by strengthening rods 2 carrying rings 4 through which pass lifting straps 3 which wind on a shaft positioned at the top. During the raising with folding of the screen, it is desirable that the screen should fold regularly and in a preferred direction. Flexible and inextensible elements 11 placed between each adjacent bar in order to limit the spacing of the said bars have a structure favouring the folding in the desired direction. …<IMAGE>… |
