| 摘要 |
A one-piece back frame including an upper portion, a lower portion and a pair of vertical portions. The upper portion includes a first flange bent downwardly and a second flange bent upwardly to enclose the upper portion. The first and second flanges are brazed or welded to one another, which has the effect of strengthening the upper portion of the back frame and increasing its resistance to forces and moments during front or rear impact. Additionally, a pair of tubes extend through and are connected to upper portion. The tubes are designed for receiving a head restraint, but also serve the additional purpose of further strengthening the upper portion to increase its resistance to forces and moments during front or rear impacts. |
