| 摘要 |
PROBLEM TO BE SOLVED: To provide such a backrest structure that a rear face plate and a back plate can be attached to a back frame preventing forward and backward rattling. SOLUTION: A backrest 19 includes the rear face plate 20 and a flexible back plate 21 arranged at the front part of the rear face plate 20 and provided with a plurality of projection parts 25 projecting to the back on the rear face. Both side end parts of the rear face plate 20 are held by the attaching grooves 23 of the opposing surfaces of the back frames 6c in left and right side part frames 6, and both side end parts of the back plate 21 are attached to the left and right back frames 6c so as to be separated from the front face of the rear face plate 21 and to bring the plurality of projection parts 25 into press contact with the front face of the rear face plate 20. COPYRIGHT: (C)2009,JPO&INPIT
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