| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problems of a warning device: it is difficult to store an expandable body compactly, and the body is likely to fall down on a road when contracted and is damaged by a car running over it.SOLUTION: The warning device is contracted by discharging air from an expandable body installed on a base board or the like. The contracted body is held by side plates swingably arranged on both side of the base board. The body can be folded into a rectangular parallelepiped as a whole. The warning device includes a fall direction control member which controls the expandable body to fall down in a predetermined direction when inside air is discharged for contraction. |
