| 摘要 |
The present invention is to provide a swinging device of a chair base, including a support frame, and a base frame which are combined with each other by connecting racks, screws, and fastening structures. The support frame includes two side racks, two support rods each secured between the two side racks by screws, and two crossbars mounted between the bottoms of the two side racks. The base frame includes two side racks, and four connecting rods each secured between the two side racks by screws. The fastening structure includes a screw bearing, a cap washer, and a sleeve, and is locked by screws and nuts.
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