Pneumatic seat cushion system

A - Human Necessities – 47 – C

Patent

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Details

A47C 27/18 (2006.01)

Patent

CA 2750724

A pneumatic seat cushion system (10) has a deformable cushion (11) having a seating surface (12) and a self inflating cushion bladder (14) positioned beneath the seating surface (12). The self inflating cushion bladder (14) has an airtight envelope (15) containing compressible material (16) which is in air communication (19) with a displacement bladder (18) such that when in use the airtight envelope (15) and the displacement bladder (18) form a closed system from which no air can enter or escape. When there is no person seated on the seating surface (12), the self inflating cushion bladder (14) is inflated and the displacement bladder (18) is deflated. When there is a person seated on the seating surface, the weight of the person compresses the compressible material (16) so as to partially deflate the self inflating cushion bladder (14) which results in the contained air passing into the displacement bladder (18) which becomes fully inflated.

L'invention porte sur un système de coussin de siège pneumatique (10) qui comprend un coussin déformable (11) ayant une surface d'assise (12) et une vessie de coussin auto-gonflable (14) positionnée sous la surface d'assise (12). La vessie de coussin auto-gonflable (14) a une enveloppe étanche à l'air (15) contenant un matériau compressible (16) qui est en communication d'air (19) avec une vessie de déplacement (18) de telle sorte que lorsqu'elle est en utilisation, l'enveloppe étanche à l'air (15) et la vessie de déplacement (18) forment un système fermé à partir duquel aucun air ne peut entrer ou s'échapper. Lorsqu'il n'y a aucune personne assise sur la surface d'assise (12), la vessie de coussin auto-gonflable (14) est gonflée et la vessie de déplacement (18) est dégonflée. Lorsqu'il y a une personne assise sur la surface d'assise, le poids de la personne comprime le matériau compressible (16) de façon à dégonfler partiellement la vessie de coussin auto-gonflable (14) qui conduit à de l'air contenu passant à l'intérieur de la vessie de déplacement (18) qui devient entièrement gonflée.

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