| 摘要 |
PURPOSE: A caster is provided to simply move heavy goods by a small force by mounting a plurality of wheels which rotate independently from each other and preventing the leaning of the wheels by mounting a spacer pipe to a shaft of the wheels. CONSTITUTION: A caster mounted to a bottom part of a truck to conveniently move a weight cargo includes a plurality of wheels(40) which are able to rotate independently, wherein the wheels are mounted to a single shaft of which outer circumference is coupled with a spacer pipe for limiting the position of the wheels, the spacer pipe is mounted with bearings at both sides, washers are mounted to both sides of the bearings to keep an interval, a buffering element(50) is mounted at an upper part of the wheels, and a rectangular buffering element supporting plate(52) is mounted between the caster and the buffering element for absorbing any external impact applied to the caster.
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