| 摘要 |
A supporting structure for a treadmill includes an outer tube, an inner tube and a spring means. The outer tube has an inner wall and a protrusion. The outer tube at where the protrusion exists has an outer-tube internal diameter r. The protrusion and the inner wall are separated by a vertical distance L. The inner tube is telescoped within the outer tube and has a positioning hole. The inner tube at where the positioning hole exists has an inner-tube external diameter R, wherein (R+L)<r. When the inner tube is parallel to the outer tube and the protrusion is aligned with the positioning hole, the spring means enters the protrusion into the positioning hole. When the inner tube is inclined with respect to the outer tube, the protrusion is disengaged from the positioning hole, allowing the inner tube to move within the accommodating space.
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