| 摘要 |
PROBLEM TO BE SOLVED: To obtain a road sign board capable of being surely installed on a road even when a warning sign is turned upside down. SOLUTION: In the road sign board with a warning sign section and an erection section erecting the warning sign section, the erection section and the warning sign section have pairs of two hinge shafts arranged in parallel and bearings opposed to these hinge shafts respectively, the two hinge shafts and bearings opposed to these hinge shafts respectively are engaged respectively in the case of a folding-up, one hinge shaft in two is supported pivotally by the bearing opposed to the hinge shaft in the case of an erection, and an engagement between the other hinge shaft and the bearing opposed to the hinge shaft is disengaged. |
