| 摘要 |
PROBLEM TO BE SOLVED: To prevent the spill of prize balls when a back board is opened to a storage frame. SOLUTION: A game board 6 is set and held in the storage frame 3 at the back of a front frame 2 and a back mechanism board 7 with a prize ball payoff device and the like is openably and closably mounted to the back of the storage frame 3. An opening/closing device 100 is installed in a prize-ball passage extending from a prize-ball outlet 81 of the back mechanism board 7 to the passage gutter 53 of an upper ball tray via an outlet 35 of the storage frame. The opening/closing device 100 is designed so that the front face of the outlet 81 can be opened and closed by inserting a screw driver D from the back of the back mechanism board 7 to turn an operating tool 130 to raise and lower an opening/closing plate 110.
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