| 摘要 |
A shifting system for chair includes a base body with a storage cavity formed in a designated shape on the lower surface, a shaft formed on the bottom surface of the storage cavity, a driving plate engaged with the shaft to freely change a rotating direction of a wheel, a connection cylinder with a threshold formed on an edge of the bottom surface of the driving plate, a spring formed within the connection cylinder, and a wheel holder with the wheel attached to the end of the spring. |
