| 摘要 |
PROBLEM TO BE SOLVED: To provide a game nail which can be sufficiently prevented from being fallen down or rotated even by short drive depth, from being bent and being cracked on a game board side at the time of putting in the nail and is adaptible to both of a plywood-made game board and a resin-made game board. SOLUTION: In the game nail erected on the game board of the pinball game machine, a multiplex spiral part on which plural spring bodies with different height of ridge parts is provided on a drive-in part. A plurality of spring bodies are equipped every type. Neighboring constituting elements of one of spring body are set at an equal interval. Further, at an intermediate position between neighboring constituting elements of one of spring body, a constituting element of another spring body is placed. COPYRIGHT: (C)2005,JPO&NCIPI
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