| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel mark with a display board to be put in the still condition securely and stably. SOLUTION: A rolling bearing 70 is attached to the outside of a cylindrical part 30 of a fixing member 18, and a middle member 20 with a weight 50 is attached to the rolling bearing 70. A rolling bearing 72 is attached to the outside of the middle member 20 with a gear 68 clasped between the fixing member 18 and the middle member 20, and a display board 22 to which a weight 66 is previously attached is attached to the rolling bearing 72. The display board 22 is supported at the middle member 20 by way of the rolling bearing 72, and the teeth 68a of the gear 68 are engaged with the teeth 44 and 58 of the middle member 20 and the display board 22. |
