| 摘要 |
A treadmill includes a base with two side rails and two posts with two handles are connected to the two side rails. Two guide members are connected to the two side rails and each guide member has two curve grooves which are located symmetrically about a diameter of the guide member corresponding thereto and share a common center. A frame with an endless belt is pivotably connected between the two side rails and two pin sets are respectively connected to each of two sides of a first end of the frame and movably engaged with the two curve grooves of respective one of the two guide members. Each pin set includes a bearing movably received in the curve groove so that the frame is easily pivoted by moving the pin sets in the curve grooves.
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