| 摘要 |
A caster includes a connecting part, a rotary support, a fork, a wheel, upper and lower springs, and a connecting stick; the connecting part is secured to a bottom side of a piece of furniture; the rotary support is arranged under and connected to the connecting part; the fork is arranged under and pivoted to the rotary support while the wheel is connected to the fork; the lower spring is positioned under an upper portion of the fork while the upper spring is positioned between the upper portion of the fork and the rotary support; the connecting stick is passed through the lower spring, the upper portion of the fork, and the upper spring in sequence, and securely connected to the rotary support at an upper end; thus, the upper and the lower springs will reduce upward and downward jolts respectively while the furniture is being moved along a rugged land.
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