A lifting cushion

B - Operations – Transporting – 66 – F

Patent

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Details

B66F 3/35 (2006.01) B29D 22/00 (2006.01) B29D 22/02 (2006.01)

Patent

CA 2300883

A lifting cushion includes an inflatable envelope (64), a first layer (4) and a second layer (6). The envelope (64) includes two rectangular sheets (66 and 68) which are connected by a plurality of cell structures (72), the sheets (66 and 68) and the cell structures (72) being made of polyaramid cord. Each cell structure (72) consists of two opposed generally U-shaped half-cell members (74 and 76). The two half-cell members (74 and 76) of each cell structure (72) are threaded through adjacent slits (78) in the sheets (66 and 68) so that the end arms (80 and 82) of the two half-cell members extend towards one another to leave a small gap (84) therebetween. The first layer (4) is wrapped around the envelope (64), and the second layer (6) is wrapped around the first layer (4) at 90~ to the direction of the first layer (4). The envelope (64) and the first and second layers (4 and 6) are heated, compressed and hot vulcanized to secure these components to one another during manufacture of the lifting cushion.

L'invention concerne un coussin de levage comprenant une enveloppe gonflable (64), une première couche (4) et une seconde couche (6). L'enveloppe (64) est constituée de deux feuilles rectangulaires (66 et 68) reliées par une pluralité de structures alvéolaires (72), les feuilles (66 et 68) et les structures alvéolaires étant en polyaramide tissé. Chacune des structures alvéolaires (72) comporte deux éléments (74 et 76) demi-alvéole opposés, généralement en forme de U. Les deux éléments (74 et 76) demi-alvéole de chacune des structures alvéolaires (72) sont enfilés par des fentes (78) adjacentes pratiquées dans les feuilles (66 et 68) de manière que les bras d'extrémité (80 et 82) des deux éléments (74 et 76) demi-alvéole soient en vis-à-vis, un espace étant ménagé entre eux. La première couche (4) recouvre l'enveloppe (64) et la seconde couche (6) recouvre la première couche (4) en formant un angle de 90· par rapport à l'orientation de la première couche (4). L'enveloppe (64), ainsi que la première et la seconde couches (4 et 6) sont chauffées, comprimées, et vulcanisées à chaud de façon à se fixer les unes aux autres lors de la fabrication du coussin de levage.

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