| 摘要 |
The seat back unit has a seat back frame which can be tilted around the tilting axis ( 11 ) of the support ( 21 ). Movable on the seat back frame ( 13 ) is the seat back ( 25 ). A linear motor ( 33 ) serves to incline the seat back frame ( 13 ) together with the seat back ( 25 ). With a linear motor ( 33 ) the distance between the support ( 21 ) and the connecting section ( 17 ) of the back frame ( 13 ) can be reduced or increased, respectively. A tape ( 43 ) extends from a stationary part ( 45 ) of the linear motor ( 33 ) via the connecting section ( 17 ) to the seat back carrier ( 44 ). Accordingly, if the seat back frame ( 13 ) is tilted towards the rear, the seat back ( 25 ) is moved downward together with the arm rests ( 29 ) attached to the seat back carrier ( 44 ). A stabilizing mechanism ( 51 ) keeps the arm rest ( 29 ) in a practically horizontal position. Accordingly, on reclining the arms of the user remain always in a practically horizontal position and are finally lowered to a position practically parallel to the body. Therefore there will be never a danger of the arms gliding down from the arm rests ( 29 ), so that also a strongly invalid user of the wheelchair will always be in a position to control the control lever ( 30 ).
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