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This is designed to address the problem of the harsh noise made by the chair due to its friction with the surface when people get up and push it backward. Equip each leg with a small wheel at its bottom. On one hand, when people stand up, the wheels will pop up by spring force and help to move the chair; on the other hand, when people sit down, the wheels will retract back automatically. It offers people a lot of convenience.
Yijun Zhao Kuan Chen Longdi Sun Chuan Cao