Semi-rigid Chain Assembly for Window Treatments
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Solution Overview
Problem
Existing manually-operated window treatments often require a safety hold or tensioner for the input chain to prevent free-hanging, which can complicate operation and limit the flexibility of the system.
Innovation Solution
A semi-rigid chain assembly with a flexible outer housing and a spring steel stiffening rod is used, allowing the chain to be free-hanging without a tensioner, while the stiffening rod limits the loop size and defines the operational path, enabling efficient rotation of the roller tube for raising and lowering the covering material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety hold or tensioner is installed on the input chain to prevent free-hanging, then the chain can be controlled, but the device complexity increases and operation becomes more complicated
Solution Approach 1:
The patent removes the safety hold or tensioner from the system by redesigning the chain assembly. The semi-rigid chain assembly inherently prevents free-hanging through its structural design (combining flexible outer housing with stiffening rod) rather than requiring an additional safety component, thus eliminating the need for separate tensioning mechanisms.
Solution Approach 2:
The patent merges the chain structure with the stiffening function by integrating the stiffening rod within the flexible outer housing. This combination creates a unified semi-rigid chain assembly that simultaneously provides flexibility for operation and rigidity to prevent free-hanging, eliminating the need for separate control components.
2Ease of operation
If a semi-rigid chain assembly with stiffening rod is used, then the loop size is limited and operational path is defined, but the chain flexibility is reduced
Solution Approach 1:
The patent applies local quality by making different parts of the chain assembly have different properties. The outer housing remains flexible to allow operation and movement, while the inner stiffening rod provides localized rigidity to define the loop size and operational path. This spatial differentiation of properties resolves the contradiction between flexibility and operational control.
Solution Approach 2:
The patent uses a composite structure combining two different materials or material states: a flexible outer housing material and a rigid stiffening rod material. This composite construction allows the chain assembly to exhibit both flexible and rigid characteristics simultaneously in different regions, enabling controlled operation while maintaining adaptability.
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 semi-rigid chain assembly simplifies operation by eliminating the need for a tensioner and allows for sufficient rotations of the roller tube, enhancing the usability and flexibility of the window treatment system.
Implementation Method 1
The stiffening rod may be a spring steel stiffening rod
Data Source
AI summary
A manually-operated window treatment system may include a roller tube, a covering material, and a semi-rigid chain assembly. The covering material may be attached to the roller tube and may be operable between a raised position and a lowered position via rotation of the roller tube. The semi-rigid chain assembly may be configured to be operated by a user to rotate the roller tube. The semi-rigid chain assembly may be configured to limit the size of a loop that can be formed by the semi-rigid chain assembly. The semi-rigid chain assembly may be operatively coupled to a drive pulley of the window treatment system. The semi-rigid chain assembly may include flexible outer housing and a stiffening rod. The flexible housing may surround and operate along the stiffening rod. The hollow chain may include multiple links that are connected together to form a continuous loop.