This paper introduces the design of a variable table ,which adopts spiral crank mechanism and cylindrical cam mechanism . It can effectively increase the usable area by expanding the diameter of itself ,to solve the problem that meeting or experimental area is not enough .The table has safe and reliable design ,being able to withstand the pressure .Without affecting smoothness ,you can ex tend the usable area of the table .%采用螺旋曲柄机构和圆柱凸轮机构 ,通过扩展桌子的直径有效地增加桌子的可用面积 ,能够解决会议或做实验时面积不够的问题 ,且操作方便.样机使用表明 ,桌子的设计安全可靠 ,能够承受一定的压力 ,在没有影响平整度的情况下扩展了桌子的使用面积.
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