CN-117582107-B - Window shade and actuating system thereof

Abstract

The invention provides an actuating system for a window covering, comprising a drive shaft pivotable about a longitudinal axis thereof, a brake spring having an engaged condition adapted to prevent pivoting of the drive shaft and a released condition allowing pivoting of the drive shaft, and a brake actuating mechanism coupled to the brake spring, the brake actuating mechanism comprising a switch actuator and a position selector, the switch actuator being movable between an initial condition and an actuated condition, the position selector having a first retaining position adapted to retain the brake spring in the engaged condition and a second retaining position adapted to retain the brake spring in the released condition, wherein the brake actuating mechanism is configured to cause the position selector to be switched from the first retaining position to the second retaining position by a back-and-forth movement of the switch actuator between the initial condition and the actuated condition, and to cause the position selector to be switched from the second retaining position to the first retaining position by another back-and-forth movement of the switch actuator between the initial condition and the actuated condition.

Inventors

• HUANG ZHONGCHEN

Assignees

• 德侑股份有限公司

Dates

Publication Date

20260512

Application Date

20230809

Priority Date

20220809

Claims (19)

1. 1. An actuation system for a window covering, comprising: a drive shaft pivotable about its longitudinal axis; A brake spring having an engaged condition adapted to prevent the drive shaft from pivoting and a released condition allowing the drive shaft to pivot, and A brake actuation mechanism coupled to the brake spring, the brake actuation mechanism including a switch actuator movable between an initial state and an actuated state, and a position selector having a first retaining position adapted to retain the brake spring in an engaged state and a second retaining position adapted to retain the brake spring in a released state; wherein the brake actuation mechanism is configured to cause the position selector to transition from the first holding position to the second holding position by a reciprocal movement of the switch actuator between the initial state and the actuated state, and to cause the position selector to transition from the second holding position to the first holding position by another reciprocal movement of the switch actuator between the initial state and the actuated state.
2. 2. The actuation system of claim 1, wherein the position selector includes a spring coupling connected to an end of the brake spring, the spring coupling pivotable about the longitudinal axis to a first angular position corresponding to a first retaining position and a second angular position corresponding to a second retaining position.
3. 3. The actuation system of claim 2, wherein the position selector further comprises: An anchor portion, and The clamping piece is movably connected with the spring coupling piece and the anchoring part; wherein the engaging member is movable to engage with a different portion of the anchor portion to set a first holding position and a second holding position of the position selector.
4. 4. The actuation system of claim 3 wherein the spring coupling is disposed in a housing and the anchor is secured to the housing.
5. 5. The actuation system of claim 3 wherein the catch is movably connected with the spring coupling at an offset of the longitudinal axis.
6. 6. The actuation system of claim 3 wherein the anchor includes a boss and a rail extending around the boss and defined between the boss and an outer sidewall surrounding the boss, and the catch has a protrusion guided to slide along the rail.
7. 7. The actuation system of claim 6 wherein the catch moves along the rail relative to the spring coupling as the spring coupling pivots about the longitudinal axis.
8. 8. The actuation system of claim 6, wherein the protrusion of the catch engages a recess in the outer sidewall when the position selector is in a first retaining position.
9. 9. The actuation system of claim 6, wherein the protrusion of the catch engages a recess in the boss when the position selector is in the second hold position.
10. 10. The actuation system of claim 3, wherein the position selector further comprises a biasing spring connected to the spring coupling, the biasing spring adapted to urge the spring coupling to pivot in a first direction that snaps the position selector into either the first or second retaining positions.
11. 11. The actuation system of claim 10, wherein the brake actuation mechanism further includes an actuator coupled to the shift actuator, movement of the shift actuator from an initial state to an actuated state causing the actuator to cause the spring coupling to pivot toward a second direction opposite the first direction, and wherein the catch moves relative to the spring coupling and the anchor as the spring coupling pivots about the longitudinal axis to transition the position selector between the first and second retaining positions.
12. 12. The actuation system of claim 11, wherein the catch is in sliding engagement with the spring coupling.
13. 13. The actuation system of claim 11, wherein the brake actuation mechanism further comprises a spring adapted to urge the shift actuator from an actuated state to an initial state.
14. 14. The actuation system of claim 11, wherein the shift actuator is pivotable between an initial state and an actuated state.
15. 15. The actuation system of claim 11, wherein the shift actuator is slidable between an initial state and an actuated state.
16. 16. The actuation system of claim 1, wherein the switching actuator comprises a bar.
17. 17. The actuation system of claim 1, further comprising a brake engagement member, wherein the brake spring is in frictional contact with the brake engagement member in an engaged state and is released from frictional contact with the brake engagement member in a released state.
18. 18. The actuation system of claim 17, further comprising: a shaft adapter pivotally coupled with the drive shaft; A lift actuation module comprising a spool and an operating member connected, the spool being pivotable in a winding direction for winding up the operating member and in an extending direction for extending the operating member, and A clutch mechanism configured to selectively couple the shaft coupler to one of the spool and the brake coupler, wherein the spool and the shaft coupler are synchronously pivotable relative to the brake coupler when the shaft coupler is decoupled from the brake coupler and the spool, and wherein the engagement state of the brake spring is adapted to prevent the drive shaft from pivoting when the shaft coupler is coupled to the brake coupler and decoupled from the spool.
19. 19. A window covering, comprising: a head rail, a movable rail, and a shielding structure disposed between the head rail and the movable rail; a winding unit mounted to the head rail, the winding unit being connected to the movable rail by a suspension, and The actuation system of any one of claims 1 to 18, wherein the drive shaft is pivotally coupled with the wrap unit, the drive shaft being pivotable to pull up and down the movable rail.

Description

Window shade and actuating system thereof Technical Field The present invention relates to curtains and their actuation systems. Background Some window coverings in the market use operating cords to pull up the bottom of the window covering and use bars to lower the bottom. More specifically, the operating cord may be pulled to drive the pivoting member to pivot, and rotation of the pivoting member is transferred to the drive shaft to pivot the drive shaft to wind up the hanging cord connected to the bottom. When the user rotates the bar, the brake member coupled with the bar is driven to release the driving shaft, so that the driving shaft can pivot, and the bottom can move downwards under the action of gravity. In the window shade of the above type, when the rotator rotates with the driving shaft to pull up the bottom, the braking force of the brake member may generate resistance to the driving shaft. Therefore, the pulling force applied by the user to pull up the bottom must overcome the braking force, and the operation is more laborious. Disclosure of Invention It is an object of the present invention to provide a window covering and an actuating system for a window covering, which are capable of reducing an internal friction force and enabling the actuating system to be conveniently operated with a small force. According to an embodiment, the actuation system comprises a transmission shaft pivotable about its longitudinal axis, a brake spring having an engaged state adapted to prevent the transmission shaft from pivoting and a released state allowing the transmission shaft to pivot, and a brake actuation mechanism connected to the brake spring, the brake actuation mechanism comprising a switch actuator movable between an initial state and an actuated state and a position selector having a first holding position adapted to hold the brake spring in the engaged state and a second holding position adapted to hold the brake spring in the released state, wherein the brake actuation mechanism is configured to cause the position selector to be switched from the first holding position to the second holding position by a back and forth movement of the switch actuator between the initial state and the actuated state, and to cause the position selector to be switched from the second holding position to the first holding position by another back and forth movement of the switch actuator between the initial state and the actuated state. According to an embodiment, the position selector comprises a spring coupling connected with an end of the brake spring, the spring coupling being pivotable about the longitudinal axis to a first angular position corresponding to the first holding position and to a second angular position corresponding to the second holding position. According to one embodiment, the position selector further comprises an anchoring portion and a clamping piece movably connected with the spring coupling piece and the anchoring portion, wherein the clamping piece can move to clamp with different parts of the anchoring portion so as to set a first holding position and a second holding position of the position selector. According to an embodiment, the spring coupling is provided in a housing, and the anchor is fixed with the housing. According to an embodiment, the catch is movably connected with the spring coupling at an eccentricity of the longitudinal axis. According to an embodiment, the anchoring portion comprises a boss and a guide rail extending around the boss and defined between the boss and an outer side wall surrounding the boss, and the catch has a protrusion guided to slide along the guide rail. According to an embodiment, the catch moves along the rail relative to the spring coupling as the spring coupling pivots about the longitudinal axis. According to an embodiment, the protrusion of the engagement member engages with a recess in the outer side wall when the position selector is in the first holding position. According to an embodiment, the protrusion of the engagement member engages with a recess in the boss when the position selector is in the second holding position. According to an embodiment, the position selector further comprises a biasing spring connected to the spring coupling, the biasing spring being adapted to urge the spring coupling to pivot in a first direction snapping the position selector into the first or second holding position. According to an embodiment, the brake actuating mechanism further comprises an actuating member in linkage with the switch actuator, movement of the switch actuator from an initial state to an actuated state causing the actuating member to urge the spring coupling member to pivot in a second direction opposite the first direction, and the catch moves relative to the spring coupling member and the anchor as the spring coupling member pivots about the longitudinal axis for switching the position selector between the first and second holding posit