Patent ID: 8857453

Claim:
A motor-operated umbrella characterized in that battery cells and a motor are installed at a space inside of a handle of an umbrella, and a changeover switch is arranged on electric wires for connecting the motor and the battery cells; a middle shaft that is divided into an upper middle shaft and a pipe-type lower middle shaft at a position that is slightly higher than that of a supporting rib holder under the full-opened state of the umbrella, a planetary gear mechanism comprising a central sun gear, planetary gears around the sun gear and an internal gear outside the planetary gears is arranged at the divided position, an upper supporter is connected to the upper middle shaft and fixed to an upper part of a planetary carrier pole installed within the planetary gear mechanism, a lower supporter is connected to the lower middle shaft and fixed to a lower part of the planetary carrier pole installed within the planetary gear mechanism, and the upper middle shaft and the lower middle shaft are coaxial connected to each other to form a fixed shaft; a driving shaft is inserted into the lower middle shaft, and a lower end of the driving shaft is connected to a motor rotating axle of the motor through a thrust bearing fixed to an upper part of the handle for transmitting a rotation of the motor, and at the same time an upper end of the driving shaft is fixed to the sun gear; the internal gear is fixed to an outer cylinder, a cylindrical male thread covering an upper part of the lower middle shaft as a shield is fitted with a lower part of the outer cylinder, and an inner peripheral surface of the supporting rib holder is formed with a cylindrical female thread corresponding to the cylindrical male thread, and a male thread cover pipe having such a length as one covering entire of the cylindrical male thread is fitted with the supporting rib holder.