Combination ladders, ladder components and methods of...

E - Fixed Constructions – 06 – C

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E06C 1/22 (2006.01) E06C 1/18 (2006.01) E06C 1/32 (2006.01) E06C 7/06 (2006.01) E06C 7/42 (2006.01)

Patent

CA 2508885

Ladder configurations and components are provided including an outer rail assembly which is longitudinally adjustable relative to an inner rail assembly. The outer rail assembly may include a pair of spaced apart outer rails each fixedly coupled to an associated sleeve or sliding mechanism. Each sleeve is in turn slidably couple to an inner rail of the inner rail assembly. The outer rails may be positioned and oriented at an acute angle relative to the inner rails so as to provide an increased base distance between the two outer rails. Support structures are also disclosed which are coupled at multiple locations along a rail member and at least one location of a rung. Additionally, ladder hinges are disclosed including hinge components configured to effectively transmit loads from associated rails. In one embodiment the hinge may include a pinch prevention mechanism.

La présente invention a trait à des configurations et des composants d'échelles comprenant un ensemble de montants extérieurs qui est réglable dans le sens de la longueur par rapport à un ensemble de montants intérieurs. L'ensemble de montants extérieurs peut comporter une paire de montants extérieurs espacés dont chacun est relié de manière inamovible à un manchon associé ou un mécanisme de coulissement. Chaque manchon est à son tour couplé en coulissement à un montant intérieur de l'ensemble de montants intérieurs. Les montants extérieurs peuvent être positionnés et orientés à un angle aigu par rapport aux montants intérieurs de manière à produire une distance de base accrue entre les deux montants extérieurs. L'invention a également trait à des structures de support qui sont reliés à une pluralité d'emplacements le long d'un organe de montant et à au moins un emplacement d'un échelon. En outre, l'invention a trait à des charnières d'échelle comprenant des pièces d'articulation conformées pour la transmission efficace de charges à partir de montants associés. Dans un mode de réalisation, la charnière peut comprendre un mécanisme de prévention de pincement.

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