Window shade and actuating system thereof
AssigneeTeh Yor Co., Ltd.
InventorChien-Fong Huang
Life of this patent
Estimating the term…
Abstract
An actuating system for a window shade includes a rotary axle, a cord winding assembly and a limiting mechanism. The cord winding assembly is coupled to the rotary axle and is connected with a plurality of suspension cords, the rotary axle being rotatable to cause the cord winding assembly to wind and unwind the suspension cords for displacing a movable rail of a window shade. The limiting mechanism includes a latch coupled to one of the suspension cords, the latch being movable between a locking state for preventing rotation of the rotary axle and an unlocking state for rotation of the rotary axle, the limiting mechanism being configured so that tensioning and loosening of the one of the suspension cords causes the latch to switch between the locking state and the unlocking state.
Claims17
An actuating system for a window shade, comprising:
- a rotary axle coupled to an axle connector;
- a cord winding assembly coupled to the rotary axle and connected with a plurality of suspension cords, the rotary axle and the axle connector being rotatable in unison about a rotation axis to cause the cord winding assembly to wind and unwind the suspension cords for displacing a movable rail of a window shade;
- and
- a limiting mechanism including a latch coupled to one of the suspension cords, the latch being movable between a locking state for preventing rotation of the rotary axle and an unlocking state for rotation of the rotary axle, the limiting mechanism being configured so that tensioning and loosening of the one of the suspension cords causes the latch to switch between the locking state and the unlocking state;
- wherein the axle connector includes an adapter rotationally coupled to the rotary axle so that relative rotation between the rotary axle and the adapter is prevented, and a sleeve disposed around the adapter, the latch being engaged with the sleeve of the axle connector in the locking state and disengaged from the sleeve of the axle connector in the unlocking state, the axle connector being configured to allow a limited range of free rotational displacement of the adapter and the rotary axle relative to the sleeve, and an engagement of the latch with the sleeve of the axle connector preventing the sleeve of the axle connector from rotating about the rotation axis in two opposite directions;
- and
- wherein tensioning of the one of the suspension cords causes the latch to switch to the unlocking state, loosening of the one of the suspension cords causes the latch to switch to the locking state, and the adapter and the rotary axle are rotatable in unison relative to the sleeve in one of the two opposite directions to actuate the cord winding assembly for tensioning the one of the suspension cords while the sleeve is engaged by the latch and is prevented from rotating in the two opposite directions.
An actuating system for a window shade, comprising:
- a rotary axle coupled to an axle connector;
- a cord winding assembly coupled to the rotary axle and connected with a plurality of suspension cords, the rotary axle and the axle connector being rotatable in unison to cause the cord winding assembly to wind and unwind the suspension cords for displacing a movable rail of a window shade;
- and
- a limiting mechanism including a latch that is coupled to one of the suspension cords and encircles the axle connector, wherein the latch is movable between a locking state where the latch engages with the axle connector for preventing rotation of the rotary axle, and an unlocking state where the latch is disengaged from the axle connector for rotation of the rotary axle, the limiting mechanism being configured so that tensioning and loosening of the one of the suspension cords causes the latch to switch between the locking state and the unlocking state;
- wherein the axle connector includes an adapter rotationally coupled to the rotary axle so that relative rotation between the rotary axle and the adapter is prevented, and a sleeve disposed around the adapter, the latch being engaged with the sleeve in the locking state and disengaged from the sleeve in the unlocking state, the axle connector being configured to allow a range of rotational displacement of the adapter and the rotary axle that actuates the cord winding assembly while the sleeve is prevented from rotating.
Dependencies are inferred from the claim text.