| 摘要 |
<P>PROBLEM TO BE SOLVED: To save a keyboard instrument space including a lid body when opening/closing, by suppressing an area in which the lid body rotates to be small dimensions. <P>SOLUTION: A lid body opening/closing structure of a keyboard instrument includes a first coupling tool 31 and a second coupling tool 41 for coupling a side wall portion 6 of a case 10 and an end part of a lid body 20 opposite thereto. A first pivotally-supporting portion 33 and a third pivotally-supporting portion 43 in which the first coupling tool 31 and the second coupling tool 41 are respectively journaled on a body portion 2 side, are rotation fulcrums on a fixed side to the body portion 2. A second pivotally-supporting portion 35 and a fourth pivotally-supporting portion 45 in which the first coupling tool 31 and the second coupling tool 41 are respectively journaled on the lid body 20 side, are rotation fulcrums on a moving side to the body portion 2. When the lid body 20 is opened/closed, the tracks of the second pivotally-supporting portion 35 and the fourth pivotally-supporting portion 45 intersect each other, and a rear end part 20a of the lid body 20 moves from a rear side to a front side of the body portion 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
