Floating Chain Tensioner for Manual Shade Loop Control
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Solution Overview
Problem
Existing manual roller shades with beaded chains often form large loops when pulled, leading to inefficiencies and a lack of control in operating the shade fabric, as they cannot maintain a small loop size effectively.
Innovation Solution
A drive assembly with intermediate tensioners, including sprockets and clamps, is introduced to prevent slack in the drive chain loop, ensuring it does not exceed a certain gap size, allowing for controlled operation and maintaining a small loop when pulled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a beaded chain is used to operate the roller shade manually, then the user can grab the chain to move the shade fabric, but the chain forms large loops when pulled, reducing control and operational efficiency
Solution Approach 1:
A chain guide is introduced as an intermediary component between the chain and the roller tube. The chain guide includes a guide surface that directs the chain and limits the loop size formed when the chain is pulled. This intermediary structure maintains ease of operation while controlling the loop shape to prevent excessive sizing.
Solution Approach 2:
The patent changes the geometric parameters of the chain path by introducing a chain guide with specific guide surface geometry. This modifies how the chain forms loops, constraining the loop size parameter while maintaining the chain's functionality for manual operation. The guide surface angle and position are optimized to achieve the desired loop control.
2Ease of operation
If the chain is allowed to form large loops, then the chain can be easily pulled, but the operational precision and control over the shade fabric is reduced
Solution Approach 1:
The chain guide serves as a mediator that maintains easy chain pullability while precisely controlling loop size. The guide surface provides a smooth path for the chain to follow, reducing friction and maintaining ease of operation, while simultaneously constraining the loop geometry to achieve precise size control.
Solution Approach 2:
By modifying the chain path geometry through the chain guide, the patent changes the loop size parameter from uncontrolled to controlled. The guide surface configuration optimizes the balance between pullability (force required) and loop size control, achieving both ease of operation and measurement precision.
Data Source
AI summary
A manual drive assembly for a manually-operated window treatment based on a drive chain formed as a loop, may incorporate one or more intermediate tensioners disposed between two ends of the loop. The loop may be formed between a manual clutch mechanism coupled to the window treatment and an end tensioner. The one or more intermediate tensioners may serve to limit slack in the loop such that sides of the loop cannot be pulled to create a large loop, for example, having a gap of four inches or greater, between the hanging sides of the cord.