Rolling Shutter End Retention System With Washer Slip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional roller shutter end retention systems face challenges such as limited slip capacity, increased material usage, and potential failure due to moment forces, especially when used with thinner profiles, and are not easily adaptable for single-walled shutter curtains.
Innovation Solution
An end retention system comprising a fastener with a washer and spacer, where the washer's inner diameter is at least twice the shaft diameter, allowing for increased engagement and slip without altering the side track shape, and featuring a compressible or rigid spacer to manage catenary forces, facilitating smooth operation and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional end retention systems are used with thin profiles, then material usage is reduced, but structural integrity and reliability deteriorate due to moment forces and limited engagement
Solution Approach 1:
The end retention system is segmented into distinct functional components: a retention member with engagement features, a separate fastening mechanism, and modular mounting elements. This segmentation allows each component to be optimized for its specific function while maintaining overall structural integrity even with thin profiles
Solution Approach 2:
The retention member incorporates engagement features that extend beyond the plane of the thin profile, utilizing three-dimensional space to create multiple engagement points. This dimensional approach increases the effective engagement area and moment resistance without increasing the two-dimensional footprint or material usage
2Manufacturing precision
If special tracks with channels are used for end retention systems, then alignment is improved, but device complexity and manufacturing sophistication increase
Solution Approach 1:
The end retention system incorporates self-aligning features where the retention member automatically positions itself within the side track during installation and operation. The engagement features are designed to guide the retention member into the correct position without requiring precision-machined channels or complex alignment mechanisms in the track
Solution Approach 2:
Instead of designing complex tracks to guide simple retention members, the invention inverts the approach by designing simple tracks that work with retention members containing built-in guidance and alignment features. The complexity is transferred from the track to the retention member, which can be more easily manufactured and installed
3Reliability
If the diameter of the end retention system is reduced to fit between retention fins, then engagement is improved, but the system becomes more susceptible to bending and failure from moment forces
Solution Approach 1:
The retention member incorporates pre-formed engagement features and reinforcement elements that are built into the structure before installation. These features preliminary prepare the system to resist moment forces by creating rigid engagement points with the side track and shutter curtain, preventing bending and failure under load
Solution Approach 2:
The retention member utilizes composite construction combining materials with different properties - such as rigid materials for structural strength and engagement features, and potentially more flexible materials for stress distribution. This composite approach maintains strength against moment forces while fitting within the constrained dimensions between retention fins
4Reliability
If end retention systems are installed in every slat, then security is maximized, but device complexity and cost increase
Solution Approach 1:
The invention enables effective security by installing end retention systems in only selected slats rather than every slat. The retention member design provides such effective engagement and force distribution that partial coverage achieves the necessary security level while reducing complexity and cost
Solution Approach 2:
The retention member is designed as a universal component that can be installed in various slat positions and works effectively whether installed in one, a few, or many slats. This multi-functionality allows the same component design to provide adequate security across different installation scenarios without requiring different component types
Data Source
AI summary
An end retention system for a rolling shutter system is provided. The end retention system comprises a fastener that has a head and a shaft, a washer and a spacer. The aperture of the washer is greater than that of the shaft. The shaft is configured for insertion into a shutter slat. A guide track is provided with retention fins spaced apart a distance that is less than the outer diameter of the washer. The guide may include a channel partially bounded by the retention fins and having a width that is greater than the outer diameter of the washer. The washer is located in the channel, and is retained near the slat by the head of and the fastener. An end retention system may have a rigid spacer, or a compressible spacer that is a resilient member located between the head of the fastener and the washer. An arrangement of rigid and compressible spacers in a curtain assembly allows the end retention systems in a curtain to have the same degree of horizontal slip, yet prevents the washers from interfering with one another when the curtain is in a rolled position.