Patent ID: 8156672

Claim:
A stormproof billboard, comprising: a column, wherein a pedestal is disposed on a top of said column; a billboard frame, wherein a rotating table is fixed on said billboard frame and corresponding to said pedestal; a rotating element disposed between said rotating table and said pedestal so as to make said rotating table rotate with respect to said pedestal; a motor disposed on said column, wherein a driver gear is driven by said motor to rotate said rotating table; an electromagnetic brake disposed on said column to lock said rotating table; an anemometer for measuring a wind speed; a trigger switch disposed between said rotating table and said pedestal to measure that whether said rotating table aligns with said pedestal; an electric control assembly respectively connecting with said electromagnetic brake, said motor, said anemometer and said trigger switch, wherein said electric control assembly controls working of said motor and said electromagnetic brake by a signal of said trigger switch and a wind speed signal measured by said anemometer; and a dogvane, wherein said dogvane connects with said electric control assembly to measure an angle D-value, and the angle D-value is a difference value between a billboard frame direction and a natural wind direction.