| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the gap between the flat surface part 27 of a front floor rail 12 and the upper surface of a floor board 13. SOLUTION: The mounting surface part 26 of the front floor rail 12 is continued to a vertical connection surface part 28 with an acute angleθ, the front edge of the floor board 13 is surely abutted on the vertical connection surface part 28 and the corner of the flat surface part 27 when the undersurface of the front edge part of the floor board 13 is mounted to the mounting surface part 26, and the floor board 13 and the front floor rail 12 are fixed to a frame 21 by a fixing screw 29, so that the gap between the flat surface part 27 of the front floor rail 12 and the upper surface of the floor board 13 is eliminated without carrying out special adjustment during assemblage and the like.
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