| 摘要 |
A chair adjusting device includes a seat support board, a base, a backrest linking base, two elastic sets, and a backrest. The two elastic sets may provide an auxiliary elastic force to the backrest linking base. The seat support board has a rear side slidably mounted on the two side plates of the backrest linking base by two pivot knobs, so that the seat support board may be moved in concert with the backrest linking base. A primary urging spring is mounted on the support rod, and has a top edge urged on a bottom face of the seat support board. |
