Abstract: A bulb assembly includes a shell, a holder, and a bulb, wherein the bulb and the holder are received in the shell, wherein the bulb has two conductive wires passing through the holder and being folded upward outsides. The shell is provided with a central plate extending to the bottom of the holder and separating two conductive wires from each other. Hence, there are two connecting types for electrical wires with conductive pins to insert into shell and contact with various position of the conductive wires that facilitates the utilization of the products.

Abstract: A rolled-up blind driving mechanism includes a chain of beads adapted to rotate a chain wheel assembly to further drive a torsional spring on a spring holder to rotate an axle sleeve in rolling up/letting off the blind, the torsional spring having two end tips, a curved connecting arm, and two coils connected between the connecting arm and the end tips of the rolled-up blind, the connecting arm and the end tips being disposed at two sides of an inside protruding portion of the axle sleeve for enabling the axle sleeve to be rotated to roll up/let off the blind of the rolled-up blind when pulling the chain of beads to rotate the chain wheel assembly clockwise/counter-clockwise on the spring holder.

Abstract: A transmission system installed in the track of a motor-driven blind and controlled to move vertical slats of the motor-driven blind between a received position and an extended position and to rotate the vertical slats in regulating the light after the vertical slats have been moved to the extended position. The transmission system includes a first power drive controlled to rotate the vertical slats to the desired angle through a transmission shaft and worm and worm gear sets, and a second power drive controlled to move the vertical slats from the ends of the track toward the middle or from the middle of the track toward the ends between the extended position and the received position through two reversed screws.

Abstract: A bi-power transmission mechanism. The transmission mechanism includes a first power unit, a second power unit, and a planetary gear train. The first power unit includes a motor, an input shaft, a worm, and a worm gear driven by the motor through the worm to rotate the input shaft. The planetary gear train includes a center gear synchronously rotated with the input shaft of the first power unit, a rack, planet gears equiangularly supported on the rack and meshed with the center gear, and an output shaft fixedly mounted on the rack for synchronous rotation with the rack and the input shaft of the first power unit. The second power unit is operated to rotate the planet gears through an internal gear via a worm and a worm gear so as to further rotate the output shaft of the planetary gear train when the first power unit fails to function well.

Abstract: A manual/auto dual driving mode transmission mechanism installed in the headrail of a vertical blind and operated to rotate vertical slats of the vertical blind, the transmission mechanism including a motor drive unit controlled by a remote controller to rotate the rotary main shaft in the headrail of the vertical blind in turning the vertical slats to adjust the light, and a chain drive unit for pulling by hand to rotate the rotary main shaft of the vertical blind manually when the remote controller or the motor of the motor drive fails.