| 摘要 |
A castor wheel assembly comprises a base member for mounting on an object to be supported, a swivel member mounted on the base member for rotation about the vertical axis. A castor wheel is mounted on a pair of side plates which extend upwardly from an axle of the castor wheel and horizontally to a cross shaft connected to the side plates. The cross shaft is mounted within a square tube forming part of the swivel member. The cross shaft carries a plurality of radially extending flanges so that elastomeric members positioned between the flanges and inside the tubular member act as a spring suspension allowing the side plates to rotate with the castor wheel relative to the swivel member about a horizontal axis providing a suspension action.
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