| 摘要 |
A caster device wherein a wheel frame mounted on a mounting base mounted on the lower surface of a traveling body in such a manner that the wheel frame may be rotated horizontally with respect to the mounting base comprises a swivel frame and a pivotal frame which can rotate together with the swivel frame and can pivotally move in a lateral direction within a preselected range, the pivotal frame having a wheel mounted thereon, the caster device comprising a direction restraining device capable of engaging the mounting base and pivotal frame in one direction of traveling of the wheel, and a brake device for applying a braking action to the wheel when it is changed over in traveling direction, whereby the pivotal frame is pivotally moved by the braking action resulting from the changeover of the traveling direction of the wheel to automatically bring the wheel frame into a freely swiveling state or a restrained state depending on the traveling direction.
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