| 摘要 |
<p>To produce a rectangular frame of automotive seat back, an upper frame, two side frames and a lower frame are used. Each of the side frames extends downward from one end of the upper frame. Two collared flanges are fixed to lower portions of the two side frames respectively in such a manner that respective holes of the collared flanges face each other. Both ends of the lower frame are received in the respective holes of the collared flanges. The ends of the lower frame are welded to the collared flanges. Due to provision of the collared flanges, the lower frame can be readily connected to the side frames without requiring the length of the lower frame to be precise. <IMAGE></p> |
