| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe display device which is a display device to be used by being hoisted to an arbitrary height by a lifting mechanism installed on a construction work site, does not expose the dangerous lifting mechanism and is free of danger of a fall. SOLUTION: The driving force of an electric motor is transmitted to a display section to drive the display section upward and downward by a first driving force transmission means (for example, a revolving shaft) which vertically slidably supports the display section with a pair of supporting legs and lifting frames and a second driving force transmission means (for example, a loop by a gear and chain) which are disposed on the inner side of both supporting legs and lifting frames. |
