| 摘要 |
A castor assembly for supporting a load such as an article of furniture so that it can easily be moved in any desired direction. The assembly includes a load-bearing base member from which a vertical axle is projected. Pivoted on this axle is a swivel frame, while mounted below the frame on a horizontal axle is a ground-engaging caster wheel. Also mounted on the swivel frame is at least one support roller which engages the base member. The position of the roller on the swivel frame is such as to minimize the moment of force developed between the vertical axle and the caster wheel, thereby protecting the assembly from the adverse effects of excessive loads and impact forces.
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