Window Shade and Actuating System Thereof

摘要

The structures described herein use an actuating system that can selectively switch between a lower and a raise mode of operation by rotating a rod assembly, and use a downward displacement of a pull member to lower and raise the window shade depending on whether its switching state. The actuating systems are simple to operate, allow convenient adjustment of the window shade, and are safe as the pull member has a limited length of extension.

主权项

1. An actuating system for a window shade, comprising:
a transmission axle and a central gear rotationally coupled with each other, the transmission axle defining an axis and being rotatable to collapse and expand a window shade; a carrier supporting a plurality of planetary gears that are disposed around the central gear, the carrier being rotatable relative to the central gear, and the planetary gears being respectively meshed with the central gear; a driving unit including a ring and a pull member, the ring being arranged around the planetary gears and internally meshed with the planetary gears, and the pull member being operable to drive rotation of the ring in a first direction; a fixed stop member axially spaced apart from the ring; and a switch member rotationally coupled with the carrier, the switch member being operable to selectively engage with either of the ring and the stop member; wherein a rotation of the ring in the first direction drives a rotation of the central gear and the transmission axle in a second direction opposite to the first direction when the switch member is engaged with the stop member, and a rotation of the ring in the first direction drives the central gear and the transmission axle to rotate in the same first direction when the switch member is engaged with ring.