| 摘要 |
<p>PURPOSE: A seat back structure of a chair is provided to help a user to maintain a correct posture and to enable a user feel a comfort. CONSTITUTION: A seat back structure of a chair comprises a first part(10), a second part(20), and a rotary unit(30). The first part supports the back of a user. The second part is rotationally coupled with the first part to surround the back of the user. The rotary unit is installed inside the first part and rotates the second part and comprises a connecting rod(31) and a support member.</p> |
