| 摘要 |
<p>The present invention is applicable to a chair having one backrest having one single backrest instead of duo back type backrest having two backrests aligned side by side in the horizontal direction. An object of the present invention is to provide the back support for an ergonomic chair, which can minimize the movement of a user's back in the horizontal direction when the one back type backrest is pushed back and rotate the backrest in the horizontal direction along with the horizontal movement of the user's back when the one back type backrest is in its upright position. To this end, the back support device for a chair of the present invention comprises: a one back type backrest for supporting both sides of a user's back all together; a backrest support for supporting the backrest; a fixing unit disposed between an upper part of the backrest and the backrest support, for fixing the upper part of the backrest to the backrest support; and an elastic unit disposed between a lower part of the backrest and the backrest support, for providing the lower part of the backrest with an elastic force to be movable in the horizontal direction relative to the backrest support when an external force is applied to the backrest.</p> |
