Field of the Invention
Belonging to a technical field of sunshade, the present invention relates to a sunshade, and more especially, relates to an opening and closing structure for an umbrella combining automatic and non-automatic modes applied to a sunshade.
Description of the Related Art
As modem daily appliances, umbrellas can roughly be divided into folded ones and straight ones. With the progress of the times, umbrellas with automatic opening and closing functions have been unveiled. With regard to the structure for an umbrella with automatic opening and closing functions, the design for the structure of a folded umbrella is easier to achieve due to the short stroke distance of its opening and closing movement, but for a straight umbrella with a long stroke distance of opening and closing movement, its structure is more difficult to achieve. An application which Publication Number is CN101999785A discloses an electric umbrella, including a movable rod and a tubular umbrella column. A lower end of the movable rod extends into the umbrella column and an upper end of the movable rod is fixedly connected with an upper umbrella plate, the umbrellacolumn is sleeved with a lower umbrella plate, and the upper umbrella plate and the lower umbrella plateare connected with an umbrella rib. An upper end of the umbrella column is fixedly provided with a pulley structures, the pulley structures are all connected with a rope, and the lower end of the movable rod is provided with a center hole, one end of the rope is connected and passes through the center hole, while the other end respectively fixed onto the lower umbrella plate. A transmission mechanism, a motor, and a control panel respectively connected with the motor are mounted in the umbrella column, wherein the transmission mechanism is fixed to the lower end of the movable rod and the motor's output shaft is connected with the transmission mechanism and capable of driving the movable rod to slide up and down through the transmission mechanism. However, an umbrella with this structure is difficult to manufacture due to the complexity of the structure and high costs. Nowadays, some electric sunshades are getting popular and are widely used in outdoor areas of venues such as beaches, villas, swimming pools and coffee shops, but the electric umbrellas are driven by a motor, so when there is no external power supply or no adequate battery charging, it is impossible to realize the electric opening and closing functions.