| 摘要 |
PROBLEM TO BE SOLVED: To suppress the fraudulent actions of inserting a piano wire to a game board while a front frame is closed. SOLUTION: In the closed state of the front frame, the front plate part 91 of each of an upper left clamp 86, a lower left clamp 87, an upper right clamp 88 and a lower right clamp 89 faces a front flange part 77 from the front, the rear plate part 92 of each of the upper left clamp 86 to the lower right clamp 89 faces a rear flange part 73 from the rear part, and the connection plate part 93 of each of the upper left clamp 86 to the lower right clamp 89 faces both of the front flange part 77 and the rear flange part 73 from the outer side. On the basis of the unreasonable operation of the front frame 4 to an open state, even when a gap is generated between the front flange part 77 and the rear flange part 73, since each of the upper left clamp 86 to the lower right clamp 89 covers the gap between the front flange part 77 and the rear flange part 73 in a U shape, it becomes difficult to conduct the fraudulent action of inserting the piano wire to the game board through the gap between the front flange pat 77 and the rear flange part 73. COPYRIGHT: (C)2009,JPO&INPIT
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