Roller Blind Spring Assist for Constant Operating Force
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Solution Overview
Problem
Existing spring-assisted roller blinds lack interchangeability of the operator's side and require oversized springs, leading to uneven operating forces and increased installation complexity, as they are not customizable for individual blind sizes and require dedicated left- and right-side operator combinations.
Innovation Solution
A roller blind system with a Protocol for selecting springs based on specific blind parameters to ensure constant operating force, using a spring assist module with torsion springs that can be pre-assembled as a self-contained unit, allowing operation from either side and accommodating different wire and spring diameters, and a formula for calculating the exact spring length to match the blind's torque curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated left- and right-side operator combinations are used, then the spring can properly drive the roller in the correct direction, but the device complexity and assembly difficulty increase
Solution Approach 1:
The patent applies universality by designing a single operator combination that can function for both left-side and right-side installations. The spring mechanism is configured to automatically adapt to the installation side through symmetrical mounting provisions, eliminating the need for dedicated left- and right-side variants. This allows the same operator assembly to universally serve both configurations, reducing inventory complexity and assembly difficulty while maintaining reliable spring operation.
2Adaptability or versatility
If oversized springs are selected to fit a range of blind sizes, then the spring can operate various blind dimensions, but the operating force becomes uneven and acceleration occurs during blind raising
Solution Approach 1:
The patent applies local quality by customizing spring parameters (wire diameter, spring diameter, length, and material properties) to match the specific blind dimensions and operational requirements. Rather than using a universal oversized spring, the solution tailors the spring characteristics to each blind's fabric weight, roller diameter, and height, ensuring optimal torque delivery and constant operating force throughout the blind's range of motion without acceleration or uneven force distribution.
3Reliability
If the spring is pre-assembled with the operator, then the spring-assist module can be pre-tested and quality-controlled, but interchangeability of operator placement is lost
Solution Approach 1:
The patent applies asymmetry in a controlled manner by designing the spring-assist module with asymmetrical internal components that can be rotated or reoriented to match symmetrical external mounting points. The module incorporates reversible mounting brackets and bidirectional spring winding capabilities, allowing the pre-assembled quality-controlled unit to be installed on either the left or right side of the blind. This maintains both quality control benefits and installation flexibility.
4Ease of operation
If a brake is provided to counteract roller acceleration, then the operating force becomes more constant, but the device complexity increases
Solution Approach 1:
The patent extracts the braking function from a separate mechanical brake mechanism and integrates it directly into the spring-assist module design. The spring mechanism itself is configured to provide progressive torque delivery that naturally counteracts acceleration, eliminating the need for an independent brake system. The spring's inherent mechanical properties and mounting configuration work together to provide smooth, constant operating force without adding device complexity.
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 a customizable solution for roller blinds with constant operating force, reducing installation complexity and cost by allowing operation from either side with the same spring assist module, ensuring consistent force requirements for lifting and lowering, and optimizing spring selection for individual blind sizes.
Implementation Method 1
at least one torsion spring having a first and a second spring end; and the torsion spring having the first end operatively coupled to the stationary member and the second end operatively coupled to the rotatable member
Data Source
AI summary
A roller blind including a roller of having a roller length and a roller outer diameter, a fabric attached to said roller for winding and unwinding from said roller. The fabric has a fabric length, a fabric weight, a fabric height, and fabric thickness. The blind includes a bottom bar having a bottom bar weight, and at least one spring operatively connected to the roller to drivingly rotate the roller in at least one direction of rotation. The spring is selected according to a Protocol such that it's length ensures that it drives the roller with a constant operating force.