| 摘要 |
Subject: Display of any type of signs (illuminated or not), advertising messages and images, messages or logotypes in night time. The collapsible arm 7 is seated on the base 1, onto the jointed connector 8 (fig.1, 2) while the hydraulic piston 2 is placed on said base 1, onto the jointed connector 3. The end of the moving part of the piston 2 is united with the members 4, 5 via the jointed connector 6. Hydraulic pressure urges the piston 2 to extend and convey through the jointed connector 6 the pressure to the members 4, 5 wich assist the raising and collapsing of the arm 7. The members 4, 5 return to their initial position upon retraction of the piston 2 and with the help of the jointed connector 6. Raising & collapsing action can be obtained by whatever technique (hydraulic, mechanical, electric technique etc) without affecting the application and value of the invention (namely, the raising, inclination, collapsing and pivoting of any sign as well as the ability of this last to bevisible only in the night). |
