| 摘要 |
PURPOSE:To sufficiently exhibit function of a cushioning material and also utilize as recycled paper or easily discard by making an entire cushioning material of a corrugated fiberboard. CONSTITUTION:Each trapezoidal cylindrical frame 13 comprises an upper face cylindrical trapezoidal frame 13B, a a lower cylindrical trapezoidal frame 13D and a front face cylindrical trapezoidal frame 13A which are integrally formed on both sides of a plane member 11, and a rear face cylindrical trapezoidal frame 13C. An internal side face of each trapezoidal frame is designed so that the internal side of a trapezoidal frame 13B comes into contact with an upper surface of a side end face of a keyboard body 3, the frame 13A with a front surface, the frame 13C with a rear face, and the frame 13 with a lower rear face. On the internal side of the plane member 11, a support member 15 is adhered to the frame 13A, a standing internal piece of a part of the frame 13B and a surface of the plane member 11. On a rear face of the plane member 11, a reinforcing member 17 fitted and fixed into a slit on a gradient side of the frame 13B and the frame 13D is provided. The support member 15 comes into contact with a surface of an intermediate stage face of the keyboard body 3. |
