| 摘要 |
PCT No. PCT/FR87/00304 Sec. 371 Date Mar. 6, 1989 Sec. 102(e) Date Mar. 6, 1989 PCT Filed Aug. 4, 1987 PCT Pub. No. WO88/01676 PCT Pub. Date Mar. 10, 1988.The hinge element is comprised of two shells (10 and 11) made of dished metal plate which are assembled by means of a locking member comprising essentially a bolt (13) and a nut (15). Each of the two shells comprises a concave circular part having a flat bottom and an annular flange presenting undulated folds which are comprised of crests (19) and rounded hollows (20). The flange is generally interrupted at a mouthpiece (21, 24) to be fixed at one end of the longitudinal uprights of a folding support. Said hinge element is provided for assembling sections of a folding ladder or a scaffolding.
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