Friction-Based Position-Fixing for Cordless Window Coverings
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Solution Overview
Problem
Conventional cordless window coverings have complex and costly brake mechanisms that wear out over time, leading to inaccurate position-fixing and require large torsion springs, making them inconvenient to operate, especially when space is limited.
Innovation Solution
A position-fixing system that includes a pole, a guiding member, and a movable member, where the movable member is driven by the rotation of a shaft to create friction along the pole, allowing the covering material to be easily fixed at any position without the need for complex brake mechanisms or large springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional brake mechanism is used to fix the position of the covering material, then the position can be maintained, but the structure becomes complex and costly
Solution Approach 1:
The patent extracts the essential function of position-fixing from the complex brake mechanism and implements it through a simple friction-based system. The brake mechanism is completely removed and replaced by a cord that creates friction against the roller shaft, achieving position maintenance without complex mechanical components.
Solution Approach 2:
The system uses the tension from the weighing member itself to create the friction force needed for position-fixing. The weighing member's weight automatically generates the necessary friction against the shaft, eliminating the need for external braking components and making the system self-regulating.
2Reliability
If a conventional brake mechanism is used to maintain position, then position-fixing is achieved, but the cost increases
Solution Approach 1:
The patent removes the expensive brake mechanism components and retains only the essential friction-based position-fixing function. This extraction of the core function eliminates manufacturing costs associated with complex mechanical brakes while maintaining position-fixing reliability.
Solution Approach 2:
The system replaces expensive, complex brake mechanisms with simple, inexpensive components such as a cord and friction surfaces. These simple components are cheaper to manufacture and replace, reducing overall system cost while maintaining functional reliability.
3Power
If large torque torsion springs are used to provide sufficient rewinding force, then the rewinding capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent uses a weighing member that acts as a counterweight to balance the covering material's weight. This counterweight system provides the necessary force to overcome friction during retraction without requiring large torque springs, reducing the power requirements and associated manufacturing costs.
Solution Approach 2:
The weighing member automatically provides the necessary force for both maintaining position and enabling retraction. The system uses the weight of the weighing member itself to generate the required forces, eliminating the need for additional power-generating components like large torque springs.
4Ease of operation
If the weighing member is pulled downward to disrupt the limited state before rolling up, then the covering material can be retracted, but the operation becomes inconvenient when space is limited
Solution Approach 1:
The patent extracts the position-fixing function from a complex brake mechanism that requires significant space for operation. The simplified friction-based system eliminates the need for additional operational space, allowing the weighing member to be manipulated directly without requiring room to pull downward for disruption.
Solution Approach 2:
Instead of requiring the user to pull downward to disrupt a limited state before retraction, the system allows direct manipulation. The friction-based mechanism enables the weighing member to be moved freely without preliminary disruption actions, inverting the conventional operational sequence and improving convenience in space-constrained environments.
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 provides reliable and easy operation for fixing the position of window coverings, maintaining accuracy and reducing manufacturing costs by eliminating the need for complex brake mechanisms and large torsion springs, while allowing for precise control of the covering material's position.
Implementation Method 1
the movable member remains in contact with the pole as being guided by the retaining face to create a friction
Data Source
AI summary
A position-fixing system includes a pole, a guiding member adjacent to the pole, and a movable member fitting around the pole. The pole is immovable relative to a window covering. The guiding member includes a principal axis parallel to an extension axis of the pole, and includes a retaining face substantially extending in the direction of the principal axis, but non-coplanar with it. The movable member corresponds to the retaining face. The movements of the movable member and the guiding member are related to that of a shaft of the window covering. When the window covering is being operated, the movable member is driven to rotate around the pole, and moves along the pole and the guiding member. Due to the retaining face, the movable member keeps contacting the pole to create a friction therebetween. Therefore, the position of a covering material of the window covering can be precisely fixed.