| 摘要 |
PROBLEM TO BE SOLVED: To rationalize a constitution of a seat back frame.SOLUTION: A seat back frame 1 forms a skeleton of a seat back, and includes respective side frames 2 and 2 for forming a skeleton of both right and left side parts of the seat back, an upper frame (an upper side frame part 3A) rigidly joined by being extended between upper parts of the respective side frames 2 and 2 and forming a skeleton of an upper side part of the seat back, and an intermediate frame (a lower side frame part 3B) set in a frame inside space 1A enclosed by the upper frame (the upper side frame part 3A) and the respective side frames 2 and 2. The intermediate frame (the lower side frame part 3B) is formed by extending a shape of the upper frame (the upper side frame part 3A) to the lower side. |
