| 摘要 |
A truck ( 20 ) journaling a wheel (W) is turnably supported leftward and rightward from a neutral position and, at the same time, a support ( 1 ) for returnably urging the truck ( 20 ) to the neutral position is provided. The support ( 1 ) comprises a weighting table ( 2 ) fixed to a deck (D) and a support table which is pivotally connected to this weighting table ( 2 ) and detachably and attachably fixes the truck. A link piece ( 7 ) is pivotally connected between the weighting table 2 and the support table ( 10 ) and, when the support table ( 20 ) is turned leftward and rightward from the neutral position, the support table ( 10 ) is allowed to return to the neutral position due to a repulsive force of a coil spring (S).
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