Patent ID: 7455345
Filing Date: 2008-11-25
Classification: B60J

Abstract:
1. A sunshade apparatus for automobiles comprising: a sunshade screen wound around a winding roll, the winding roll being installed inside a casing and being biased by an elastic member; a shade bar holding an edge of the sunshade screen; a first arm unit and a second arm unit, each comprising upper and lower arm members, the upper arm members of the first and second arm units being jointed to opposite ends of the shade bar using respective pivots, and the lower arm members being jointed to opposite ends of the casing using respective pivots and being jointed to the upper arm members using respective hinges; first and second linking rods jointed at first ends thereof to respective extension ends of the lower arm members using respective pivots; and a drive unit including a drive motor and moving the first and second linking rods in opposite directions, thus stretching or closing the first and second arm units and extending or winding the sunshade screen, wherein first and second racks are jointed to second ends of the first and second linking rods using respective pivots, and are movably inserted into a housing of the drive unit such that the racks can move in opposite directions without interference; the drive unit comprises: a small-diameter gear mounted to a shaft of a worm wheel engaged with a worm of a rotating shaft of the motor, and engaged with a large-diameter gear of a first output shaft; a first drive pinion mounted to the first output shaft and engaged with the first rack; and a second drive pinion mounted to a second output shaft and engaged both with the first drive pinion and with the second rack; and torsion springs are fitted over respective pivots, which joint the upper arm members of the first and second arm units to the shade bar, first ends of the torsion springs being locked to respective locking holes of the shade bar, and second ends of the torsion springs being caught by respective locking grooves of the upper arm members, so that the torsion springs can bias and stretch respective upper arm members outwards.