| 摘要 |
A controlled-folding and controlled-unfolding multiple section platform assembly for a structural entry. A platform assembly includes an inner and an outer platform section which are pivotally joined together for folding and unfolding. Fold control means comprises a pair of pivotally jointed rigid supports and a rigid co-ordinating member extending between the inner platform section and the outermost of the rigid supports. Tilting of the inner platform section is accompanied by a folding action of the outer platform section, there being a unique included angle between the two platform sections for every unique angle of tilt of the inner platform section. |
