| 摘要 |
PROBLEM TO BE SOLVED: To reliably collect residual cracked debris of a nail when the nail is broken, and a new nail is driven from a game board front surface side without decomposing the game board, and is replaced.SOLUTION: On a synthetic resin plate member 20 having optical transparency composing a body of a game board 1, a lower hole where an obstacle nail is driven is bored. An upper part of a peripheral wall part 31 of a reverse unit 3 is provided with a flat plate part 32 integrally formed in the way that it rises upward, and the flat plate part 32 has a square cylindrical part 35 having a square hole 34 integrally formed. The flat plate part 32 is in contact with a back surface of the game board 1 in the state that a back surface of a striking nail 11a is covered, and the square hole 34 becomes a hole which extends in correspondence with an extention line of a striking lower hole 24. Cracked debris 11b of the nail remaining in the striking lower hole 24 is driven to enter the square hole 34 and retained. |
