Bi-directional Clutch with Return Feature for Roller Shades
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Solution Overview
Problem
Existing roller shade clutches pose a strangulation hazard due to hanging cords or chains and require additional components like cord guides and breakaways, increasing installation complexity and cost.
Innovation Solution
A bi-directional clutch with a return feature, comprising a clutch base, drive sprocket, clutch housing, and a return drive mechanism including a tether and torsion spring, allowing for compact mounting and eliminating the need for continuous loops and additional guides, enabling safe and efficient operation without breakaway links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional clutch mechanisms with continuous loops of cord or chain are used, then the roller shade can be raised and lowered, but the hanging cords or chains create strangulation hazards requiring additional cord guides and tensioning devices
Solution Approach 1:
The patent extracts and eliminates the harmful continuous loop of cord or chain from the system. Instead, it uses a tether that is paid out from a tether base as the clutch housing rotates, allowing the shade to be raised and lowered without having hanging loops that could wrap around a child's neck. The tether is contained within the headrail structure rather than hanging freely.
Solution Approach 2:
The patent introduces a tether base and tether mechanism as an intermediary between the clutch housing and the shade fabric. The tether acts as a controlled connection element that can be paid out and reeled in, replacing the dangerous continuous loop while maintaining the functional connection needed to raise and lower the shade.
2Object-affected harmful factors
If cord guides and tensioning devices are added to minimize strangulation risk, then safety is improved, but the number of component parts and overall cost increase
Solution Approach 1:
The patent merges the safety function with the existing clutch mechanism. The tether base and tether integration are incorporated into the clutch housing assembly itself, eliminating the need for separate cord guides and tensioning devices. The clutch housing rotation mechanism inherently controls the tether payout, combining multiple functions into a unified system.
Solution Approach 2:
The clutch housing serves multiple functions: it contains the clutch mechanism for raising and lowering the shade, houses the tether base, and controls the tether payout through its rotation. This multi-functionality eliminates the need for dedicated safety components, reducing overall device complexity while maintaining safety.
3Ease of operation
If cord guides and tensioners are secured to the window frame, then cord control is improved, but installation labor increases due to drilling and securing requirements
Solution Approach 1:
The patent combines the cord control function directly into the movable clutch housing assembly that is already mounted to the roller tube. The tether base and tether control mechanism are integrated into this existing mounting structure, eliminating the need for separate cord guides that would require drilling and securing to the window frame.
4Volume of moving object
If a compact clutch structure is achieved by axial alignment of components, then mounting in confined locations is facilitated, but the mechanism complexity increases
Solution Approach 1:
The patent employs a nested arrangement where the tether base and return spring are positioned coaxially within the clutch housing structure. The tether base is received within the clutch housing, and the return spring is positioned within the tether base, creating a compact nested configuration that reduces the overall volume while managing the mechanism complexity through systematic spatial organization.
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 solution provides a safe, compact, and cost-effective clutch mechanism that reduces the risk of strangulation hazards and simplifies installation by integrating a return feature, allowing bi-directional operation without continuous loops and additional guides, enhancing safety and ease of use.
Implementation Method 1
a return spring, said return spring comprising a torsion spring having a first end engageable with said shaft portion and a second end engageable with said tether base
Data Source
AI summary
A clutch having a clutch housing and a drive sprocket coaxially and rotationally mounted about a drive housing that is coaxially mounted about a shaft portion. The clutch housing has one or more drive sprocket engaging members with a locked and an unlocked position. When locked the drive sprocket engaging members lock the drive sprocket to the drive housing. When unlocked the drive sprocket engaging members permit the drive sprocket to rotate independently from the. A return drive mechanism includes a tether, a tether base and a return spring. The tether has a first end secured to the tether base and a second end secured to the clutch housing. The clutch housing, tether base and return spring are axially aligned and coaxially mounted about the shaft portion to present an overall compact clutch structure to facilitate mounting in confined locations.