This unique parasol design has side parts, which can be let down or raised by turning an integrated crank handle. When lowered the sides are fitted with weight so that they have purchase on windy days. A conventional crank handle cannot lift the necessary weight, and only a limited amount of line can be wound around the crank axle.
Main criteria for the application
Due to a "pulley-like" mechanism on each parasol rib of the frame, which increases the lifting power of the crank handle, the power required to lift the sides and the weights is doubled.
An extremely high force is exerted on the rotary crank in the upwards direction.
Cost awareness, to keep an affordable price