| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball-return prevention device capable of preventing fraudulent conducts committed with a game ball to which an operation thread is attached.SOLUTION: The ball-return prevention device includes: a support member 20 to be fixed to an upper end part of an inner rail 10a constituting a ball guide path; a swing member 30 pivotally supported by the support member 20, and opens/closes a ball outlet of the ball guide path; and a regulation member 40 which is mounted to the support member 20, and to which a sandwiching part facing downward expanding in a V-shape is formed at least with two piece parts. The regulation member 40 is provided so as to be positioned at a lower end side of the support member 20, and catches a thread-like body, if the thread-like body invades into the ball guide path, with a deep part of the sandwiching part to regulate the movement of the thread-like body.SELECTED DRAWING: Figure 7 |
