| 摘要 |
PURPOSE:To reduce parts for locking a back to a side by providing a projection for engaging the size directly to the back, and making part of the back, which corresponding to the position of the projection, elastic. CONSTITUTION:The section of the elastic structure part 28 of a back 27 is channel-shaped while consisting of the 1st vertical part 28a, a horizontal part 28b, and the 2nd vertical part 28c. A projection 29 provided to the external surface of the 2nd vertical part 28c of the elastic structure part 28 is triangularly- sectioned pawl, and the horizontal bottom surface of this projection engages the internal wall of the through hole 23 of a side 21 to fix the back 27 to the side 21. The slanting surface of the projection 29 is so provided that when the back 27 is adhered to the side 21, the projection 29 reaches the through hole 23 smoothly. |
