| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a novel structure with which a lead-free alternative weight can be mounted on a keyboard while existing manufacturing equipment (keyboard instrument manufacturing equipment or the like) is used as it is in the case of using a lead-free alternative material as a weight for the keyboard for the keyboard instrument, such as a piano. <P>SOLUTION: The lead-free alternative weight 10 constituted by combining a part X and a part Y made of copper or iron which is a high specific gravity metal approximate to that of lead is inserted into a mounting hole 62 for mounting the lead-free alternative weight 10 disposed at the keyboard 60 (a). The inserted lead-free alternative weight 10 is pressed in an insertion direction by a pressing member 65 (b). Then, the joined parts 11 between the parts X-Y of the lead-free alternative weight 10 bulge on the outer periphery in contact with a mounting hole inner wall 63 (c). As a result, the lead-free alternative weight 10 is eventually surely fixed into the mounting hole 62. Also, the lead-free alternative weight 10 unseparably engages the joined parts 11 in its internal space. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
