| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily mold and work a long bridge, a short bridge and a connection part piece and to reduce cost by individually molding and working respective parts. SOLUTION: A long bridge 1, a short bridge 2 and a connection part piece 3 are individually prepared by molding and working synthetic resin or wood to prescribed shapes. A notched part 4 is formed on the lower surface of one end of each of the long bridge 1 and the short bridge 2, notched parts 5 to be engaged with the notched parts 4 of the bridges 1, 2 are formed on the upper surfaces of both the ends of the piece 3 and through-holes 7 for penetrating screws 6 e.g. in order to join the bridges 1, 2 to the piece 3 are formed on one-ends of the bridges 1, 2. In the case of fitting the connection bridge consisting of the long bridge 1, the short bridge 2 and the connection part piece 3 to an acoustic board 8, the bridges 1, 2 are stuck to the board 8 at first, and then the notched parts 5 formed on both the ends of the piece 3 are engaged with the notched parts 4 formed on one-ends of the bridges 1, 2 and stuck to the board 8 and the bridges 1, 2 are joined with the piece 3 through screws 6.</p> |
