CPC A47C 1/03255 (2013.01) [A47C 1/03274 (2018.08); A47C 7/14 (2013.01); A47C 7/46 (2013.01)] | 16 Claims |
1. A lower chair for supporting an upper chair on which a user sits, the lower chair comprising:
a base;
a swivel mechanism supported by the base, defining a vertical swivel axis;
a four-bar linkage mounted to the swivel mechanism for rotation about the swivel axis, the four-bar linkage including a coupler link that moves about a coupler curve; and
a column having a lower end affixed to the coupler link for movement of the lower end along the coupler curve, the column defining a column axis and adapted to support the upper chair.
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