| 摘要 |
The present invention relates to a joint chair with a backrest unit installed on the back of the seat member so as to support the back of the user sitting on the seat member. The backrest unit of the joint chair is provided with a support frame installed on the back of the seat member and extended upward with respect to the seat member. Also, a round joint member (600) is disposed at both end portions of primary and secondary fixing arms, which are disposed at the upper and lower ends of the support frame and positioned to the left and right to be apart from each other in an axial direction, and which have an elastic force, rigid support bars (450) at both ends being insert-molded at the joint member (600) with a soft bonding member (480), side surface reinforcing connection portions (451) being formed on both end sides of the rigid support bars (450), lead-in grooves (452) being formed therein, a molten resin being led into and cured during insert molding of the soft bonding member (480), and a backrest seat being provided with multiple support bars (422) which are arranged apart from each other in a vertical direction. |
