| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a durable game board of a Pachinko machine wherein the fatigue breakdown of nails is suppressed and the nail is easily adjusted without breaking the surrounding of a nail implanting section in nail adjustment work. Ž<P>SOLUTION: On the front surface of the game board 12 made of synthetic resin, a guide rail 13 is mounted. The through-holes 21 consisting of long hemi-arcuate holes are formed at symmetrical positions surrounding a nail 14 easy to be fatigue-broken by collision with a game ball B, among a large number of nails 14 driven into a game area 11 surrounded by the guide rail 13, to form a thin column 22 between the through-holes 21 and the nail 14. The column 22 is elastically deformed by an impact force when the game ball collides with the nail 14, thereby absorbing the impact force to prevent the nail 14 from being broken due to fatigue. On the rear surface side of the game board 12, an adaptor member 30 to be moved toward the through-holes 21 by a driving device is provided. By fitting the tip of the adaptor member 30 into the through-holes 21, nail adjustment is performed to prevent the column 22 from being broken. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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