| 摘要 |
<p>PURPOSE: A seat back for a chair is provided to enables a user to stably lean on a seat back after sitting on a chair and to improve sense of stability. CONSTITUTION: A seat back for a chair comprises: a back support(300) combined with a board supporting plate supporting a seat plate; a lumbar vertebra receiver(50) which is combined with a lumbar vertebra receiver support; a lumbar vertebra receiver support(400) in which the lumbar vertebra receiver is combined with the top thereof; lumbar vertebra receiver fixing members(55a,55b) in which through-holes are formed in the left and right thereof; a rotary shaft(56); and a supporting plate(57) of which height is adjusted by a fastening component.</p> |
