| 摘要 |
PROBLEM TO BE SOLVED: To provide a game nail which is suitably applicable to both wood plywood game panel and resin game panel with the ensurance of preventing the nail from coming off or rotating even when it is driven shallowly into the panel and also preventing the nail from being bent or causing cracks in the game panel when the nail is driven into the panel. SOLUTION: A multiple helical part 70 including a helix 71 with a high ridge part and a helix 72 with a low ridge part is formed in the driven introduction part of a game nail 7 into a game panel. Thus it is possible to ease the difficulty of an operation to drive the nail 7 when its helical part is normally constituted of only the helix having the ridge part of a uniformly large height, and also prevent the bending of the nail or the cracking of the game panel from occurring. Further, it is possible to suppress the excessive enlargement of a hole and extract the bracing force of the helix 71 having a high ridge part and the frictional force of the helix 72 with a low ridge part with a minimum loss. Consequently, the sufficient retaining strength of the nail can be maintained without securing the driven depth of the nail to the much large extent.
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