| 摘要 |
A caster structure for treadmill runner which has a runner frame comprised of a master frame, a framework, a running board, a front transverse lever, a hand holder and a floor-type rear prop. The caster assemblies fit in both ends of the transverse lever horizontally installed at the base of master frame and the front transverse lever with a pipe plug by press fitting. A plurality of anchoring holes are drilled in the pipe plug facing outwardly to allow insertion of the axle of the caster assembly. Thus, when the caster assembly is anchored to a lower anchoring hole, the caster contacts the floor surface and enables the treadmill runner be moved. When the caster assembly is anchored in an upper anchoring hole, the caster will not touch the floor surface enabling the treadmill to steadily remain on the floor surface enabling the treadmill to steadily remain on the floor surface without any slippery occurrence.
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