Window Shade Actuation With Selective Brake Coupling for Lower Friction
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Solution Overview
Problem
Existing window shades require increased user effort due to braking forces that resist the rotation of the drive axle, leading to higher friction and component wear.
Innovation Solution
An actuating system for window shades that includes an axle coupling part, a braking part, a brake coupling part, a lift actuating module with a spool, and a clutching mechanism to selectively couple the axle coupling part to either the spool or the brake coupling part, reducing friction by allowing concurrent rotation when decoupled from the brake coupling part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the braking force of the arrester is applied to prevent rotation of the drive axle, then the window shade can be held in position, but the user effort required to raise the bottom part increases
Solution Approach 1:
The clutching mechanism dynamically switches between two states: engaged state where the brake coupling part connects the drive axle to the arrester for position holding, and disengaged state where the brake coupling part disconnects to allow free rotation during raising/lowering operations. This dynamic switching resolves the contradiction by applying braking force only when needed for position holding, not during operation.
Solution Approach 2:
The brake coupling part acts as an intermediary element between the drive axle and the arrester. It selectively transmits or blocks the braking force based on the operational state, mediating between the conflicting requirements of position holding and ease of operation. The clutching mechanism controls this intermediary to achieve the desired effect.
2Reliability
If the braking force creates resistance against rotation of the drive axle, then the bottom part can be held at desired position, but component wear increases
Solution Approach 1:
The system dynamically engages the brake coupling part only when position holding is required, and disengages it during motion phases. This minimizes the duration and intensity of frictional contact between the arrester and drive axle, thereby reducing component wear while maintaining position holding capability when needed.
Solution Approach 2:
The brake coupling part is designed to be extractable or disconnectable from the drive axle connection. This allows the braking function to be completely removed from the power transmission path during operations, eliminating wear-causing friction entirely during these phases while preserving position holding capability.
3Stability of the object's composition
If the arrester applies continuous braking force, then position stability is improved, but the effort to operate the window shade increases
Solution Approach 1:
The clutching mechanism provides dynamic control over the brake coupling part engagement. Position stability is maintained through selective engagement of the arrester only when the window shade is at the desired position, while ease of operation is achieved through disengagement during raising and lowering motions, eliminating resistive braking force during these phases.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces internal friction, lowers the effort required for operation, extends the service life of components, and facilitates easier operation by minimizing wear and resistance.
Implementation Method 1
the spool being rotatable in a winding direction to wind the operating part and in an unwinding direction to unwind the operating part
Implementation Method 2
the braking part being adapted to apply a braking force on the brake coupling part for preventing rotation of the brake coupling part
Implementation Method 3
The spool and the axle coupling part are concurrently rotatable relative to the brake coupling part when the axle coupling part is decoupled from the brake coupling part and coupled to the spool
Data Source
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AI summary
An actuating system for a window shade includes an axle coupling part rotatable for raising and lowering a movable rail of the window shade, a braking part and a brake coupling part connected with each other, the braking part being adapted to apply a braking force on the brake coupling part for preventing rotation of the brake coupling part, a lift actuating module including a spool connected with an operating part, the spool being rotatable in a winding direction to wind the operating part and in an unwinding direction to unwind the operating part, and a clutching mechanism including two clutching parts movable relative to the brake coupling part and the spool to selectively couple the axle coupling part to either one of the spool and the brake coupling part.