One side of the tray base is fitted with the lower sections (14,14') of a fastening yoke (12) whose upper part has a fixing device (13) for detachably fitting over the cross rails of a ladder. The lower sections of the fastening yoke have a hinged joint (16,16') for folding the...
adying in the 死在 [translate] aSuitable ladders shall be used whenever necessary during erection, but such ladders and removal step bolts shall be removed when erection work is not in progress 将使用适当的梯子,每当必要在架设,但这样梯子和撤除步螺栓期间将去除,当架设工作不进展中 [translate] ...
Arrangements for realizing portable folding step ladders and for joining two sections to be used in a closed and open positionThe portable collapsible ladder uses pin-joints between the rungs and the posts. O-section each each house two longitudinal bars with a gap between them. Rung ends fit...