| 摘要 |
The invention relates to a swivel wheel unit comprising a support (11) provided with a vertical pivot (13) which is mounted in a bearing of a wheelchair or another device, such that it can pivot about a pivoting axis (19) when manoeuvring about curves and U-turns, on whose end a swivel wheel (21) is rotationally mounted. A joint (17) displaces about a horizontal axis (23) counter to the force of the spring elements, when the swivel wheel (21) comes into contact with an obstacle (41). Said joint (17) is a spring joint and maintains the pivoting axis (19) in the displayed normal position, as long as no obstacle (41) arises. A lifting wheel (33), which initially raises the swivel wheel (21) in order to overcome the obstacle, is located in front of the swivel wheel (21), but higher, and when the swivel wheel (21) comes into contact with the obstacle (41), the pivoting axis (19) is pivoted and the swivel wheel (21) is lifted further. The arm (38) of the lifting wheel (33) is pivoted therewith, such that the horizontal axis (23) is lifted so that the swivel wheel (21) is lifted again. The swivel wheel (21) can rise above the obstacle (41) as long as the axis (25) of the swivel wheel (21) is higher than the obstacle (41). |
