| 摘要 |
An elevation-adjusting device serves for a seat of an exercise bicycle. The exercise bicycle is capable of standing on the ground. The device comprises a positioning device having a buckling post; the buckling post having a buckling section; an outer tube; an inner tube installed within the outer tube; the elevation of the inner tube being adjustable with respect to the outer tube; the inner tube being fixed to the outer tube by using the positioning device to be buckled into one of a plurality of positioning holes of the inner tube; and each of the positioning hole having a respective lip which obliquely protrudes from an inner wall at a lower end of the positioning hole; thereby, the buckling section of the buckling post of the positioning device being tightly secured to the positioning hole and the inner tube being lifted easily and smoothly.
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