Adjustable Head Rail Spring for Cordless Roller Blind
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Solution Overview
Problem
The existing spring-type cordless automatic roller blind designs require different non-standard springs to match roller blinds of varying widths, lengths, and materials, leading to increased design, production, and sales costs.
Innovation Solution
An adjustable head rail device with a spring and a limiting assembly, where the limiting assembly applies radial pressure to convert a portion of the spring into a rigid member, allowing the working length of the spring to be adjusted to accommodate roller blinds of different dimensions and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different non-standard springs are used to match roller blinds of varying widths, lengths, and materials, then the roller blind can balance its gravity effectively, but the design cost, production cost, packaging cost, transportation cost and sales difficulty increase
Solution Approach 1:
The patent applies the dynamics principle by making the spring's effective working length adjustable through a limiting assembly that can be positioned at different locations along the spring. This allows a single standard spring to dynamically adapt its characteristics to match different roller blind specifications (width, length, material), replacing the need for multiple fixed-specification springs. The limiting assembly creates different effective spring lengths by constraining portions of the spring, thereby providing gravity balancing for various roller blind configurations using one universal spring design.
Solution Approach 2:
The patent implements parameter changes by modifying the effective working length of the spring through the adjustable limiting assembly. By changing the position of the limiting assembly along the spring axis, the effective length parameter of the spring is varied, which directly changes the spring constant and elastic potential energy characteristics. This enables a single spring to provide appropriate gravity balancing for roller blinds with different parameters (area, material density, dimensions) without requiring multiple springs with different fixed parameters.
2Device complexity
If a standard spring is used for all roller blinds, then the production and sales costs are reduced, but the spring cannot effectively balance the gravity of roller blinds with different dimensions and materials
Solution Approach 1:
The patent makes the spring system dynamic by introducing an adjustable limiting assembly that can be repositioned along the spring's length. This allows the same standard spring to adapt its effective working length and elastic characteristics to match the specific gravity requirements of different roller blinds. The dynamic adjustability ensures that a single standard spring can reliably balance gravity for roller blinds with varying dimensions and materials, maintaining reliability while reducing spring specification variety.
Solution Approach 2:
The patent achieves universality by designing a single standard spring that can serve multiple functions for different roller blind applications. Through the adjustable limiting assembly, one spring design can be configured to work with roller blinds of various widths, lengths, and materials. This multi-functional capability eliminates the need for multiple specialized spring types, allowing the same spring to be universally applied across different product specifications while maintaining effective gravity balancing.
3Ease of manufacture
If the spring working length is fixed, then the manufacturing process is simplified, but the roller blind cannot adapt to different window sizes and shading needs
Solution Approach 1:
The patent introduces dynamics by making the spring's effective working length adjustable through the repositionable limiting assembly. While the spring itself is manufactured with a fixed overall length using standard processes, the effective working portion can be dynamically adjusted by moving the limiting assembly to different positions. This maintains manufacturing simplicity for the spring production while providing configuration flexibility for different window sizes and shading requirements through field adjustment of the limiting assembly position.
Solution Approach 2:
The patent applies segmentation by dividing the spring into different functional segments using the limiting assembly. The limiting assembly effectively segments the spring into a constrained portion and a working portion, where only the working portion between the limiting assembly and the fixed end contributes to the elastic potential energy storage. This segmentation allows the same spring to provide different effective working lengths for different applications, maintaining ease of manufacture while achieving adaptability for various roller blind configurations.
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 adjustable head rail device allows for a wide range of applications by enabling the spring's working length to be adjusted, reducing the need for multiple non-standard springs and lowering production and sales costs while maintaining effective operation.
Implementation Method 1
The elastic potential energy of a torsion spring is utilized by the cordless roller blind to balance the gravitational potential energy of a roller blind fabric
Implementation Method 2
The elastic potential energy of a torsion spring is utilized by the cordless roller blind to balance the gravitational potential energy of a roller blind fabric
Implementation Method 3
the limiting assembly is configured to apply a radial pressure to the spring, so that the abutted portion of the spring is converted from an elastic member to a rigid member
Data Source
AI summary
An adjustable head rail device of a spring assisted cordless roller blind includes a spring and a limiting assembly, the spring is indirectly connected to a roller blind fabric to provide the roller blind fabric with a pulling force that balances its own gravity; the limiting assembly abuts against a middle portion of the spring, and the limiting assembly applies a radial pressure to the spring, so that the abutted portion of the spring is converted from an elastic member to a rigid member, and is not elastically deformable; the limiting assembly is movable in an axial direction of the spring to adjust a position of the abutted portion of the spring, which can realize an adjustable working length of the spring arranged in the head rail device, and can adapt to the roller blinds with different widths, materials and lengths, with a wide application range.