Seat supporting assembly and wheelchair including same

Details Seat supporting assembly and wheelchair including same Seat supporting assembly and wheelchair including same

A - Human Necessities

47

C

A47C 1/032 (2006.01) A47C 7/02 (2006.01) A61G 5/00 (2006.01) A61G 5/10 (2006.01)

Patent

CA 2626159

A seat supporting assembly (24) for supporting a seat (18), the assembly comprising a base (25) including a substantially elongated guiding rod (58), a seat support (36), a seat support-to-base linking member (56) pivotally coupled to the seat support (36) and sliding on the base guiding rod (58), a substantially elongated tilting member (60) having a guiding groove (66) and being pivotally attached to the seat support (36) and to the base (25). An actuating assembly (44) is coupled to the base (25) and includes a motion transmitting member (68) mounted within the guiding groove (60). The force from the actuating assembly moves the tilting member (60) according to the geometry of the guiding groove (66), which causes the seat supporting assembly (24) to move between tilted and upright configurations by pivoting the tilting member (60) relative to the seat support (36) and the base (25) and substantially simultaneously moving the seat support-to-base linking member (56) longitudinally relative to the guiding rod (58). The assembly is designed to maintain the location of the center of gravity of a user as the seat tilts rearwardly by automatically moving the seat forwardly during tilting. The guiding groove (66) in the tilting member (60) may be curved such that the tilting motion occurs with a constant angular velocity The seat assembly is particularly useful for wheelchairs.

La présente invention concerne un ensemble soutenant un siège (24) destiné à soutenir un siège (18), l~ensemble comprenant une base (25) comprenant une tige de guidage sensiblement allongée (58), un support de siège (36), un élément de liaison support/base du siège (56) couplé avec faculté de rotation au support de siège (36) et coulissant sur la tige de guidage de la base (58), un élément d~inclinaison sensiblement allongé (60) comportant une rainure de guidage (66) et étant fixé avec faculté de rotation au support de siège (36) et à la base (25). Un ensemble d~actionnement (44) est couplé à la base (25) et comprend un élément de transmission de mouvement (68) monté à l'intérieur de la rainure de guidage (60). La force provenant de l~ensemble d~actionnement déplace l~élément d~inclinaison (60) selon la géométrie de la rainure de guidage (66), ce qui amène l~ensemble de support de siège (24) à se déplacer entre des configurations inclinées et dressées en faisant pivoter l~élément d~inclinaison (60) par rapport au support de siège (36) et la base (25) et en déplaçant sensiblement simultanément ledit élément de liaison (56) longitudinalement par rapport à la tige de guidage (58). L~ensemble est conçu pour conserver l~emplacement du centre de gravité d~un utilisateur alors que le siège s~incline vers l~arrière en déplaçant automatiquement le siège vers l~avant lors de l~inclinaison. La rainure de guidage (66) dans l~élément d~inclinaison (60) peut être courbée de telle sorte que le mouvement d~inclinaison se produit avec une vitesse angulaire constante. L~ensemble siège est particulièrement utile pour les fauteuils roulants.

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