摘要 |
A rotary device of a chair comprises a chair body having a seat. A resisting body extends from a rear end of the seat. An annular handle is installed on the resisting body. The chair body has a driving means which is installed at the seat of the driving means. The driving means has a deceleration motor, a worm rod, a worm gear and a chain. The deceleration motor has a deceleration gear. One end of the deceleration motor has a driving spindle. After the driving spindle is connected with the worm rod, the worm gear will be driven to rotate. The worm gear has a protruded driving shaft. One end of the chain is engaged to the driving shaft, while another end of the chain is engaged to the resisting body. The worm gear indirectly drives the resisting body and the handle to generate a predetermined reciprocal motion.
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