| 摘要 |
A driving pinion drives two driven gears which are engaged with the driving pinion to rotate. Two drive bars which are fixed on the driven gears at a set radius respectively are inserted into two elongated openings of a frame which is pivoted on the driving pinion to make the frame seesaw, and then to make a coupler link which is borne on a stand, seesaw synchronously via a rocker mechanism having a four-bar linkage which is pivoted on both ends of the frame. Also, the stand is connected to an inclination adjusting mechanism, so that the inclination of the stand can be changed with respect to a horizontal plane.
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