| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lid opening/closing device for a keyboard musical instrument, the device easily attaching a tensile force generation elastic element for a damper for preventing a lid for exposing a keyboard part from falling rapidly. <P>SOLUTION: A fixed base 31 is fixed to a shelf board 2 and an upper back plate 5 in a center part of the arrangement direction of the keys. A damper unit 32 includes extension springs (tensile force generation elastic elements) 41 and 44 that are arranged diagonally, orthogonally, and line-symmetrically with respect to the moving direction of a lid body (front lid 21 and back lid 22) and have the same characteristic, spring attaching members 42 and 45 for attaching one-end parts of them to the back surface of the back end of the back lid 22, and a spring attaching member 43 for attaching the-other-end parts of them to a fixed position of the fixed base 31 separated on the most depth side from the keyboard part. The horizontal part 31a of the fixed base 31 is provided with a long hole 31b for temporarily holding projections 43d and 43e of the spring attaching member 43, and screw attaching holes 31c and 31d for fixing the spring attaching member 43. <P>COPYRIGHT: (C)2009,JPO&INPIT |
