Closure System Strap Deflection Control
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Solution Overview
Problem
Existing closure systems are susceptible to being pried open, allowing unauthorized access due to slat overlap when a vertical force is applied, as they deform and create a gap between the closure and the surface.
Innovation Solution
A closure system with a strap and bottom bar configuration that resists deformation, where the strap is coupled to the closure and bottom bar, preventing slat overlap by maintaining structural integrity and limiting deflection distances, thereby preventing access when a vertical force is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a closure system is made flexible to allow coiling about a shaft, then the closure can move between extended and retracted states, but the closure becomes susceptible to prying forces and deformation
Solution Approach 1:
The closure is divided into multiple individual slats that can move independently relative to each other. Each slat is separated by spacers, creating a segmented structure that allows the closure to coil about the shaft while maintaining structural integrity. The segmentation enables the closure to adapt to different positions (extended/retracted) without requiring the entire structure to deform under prying forces.
Solution Approach 2:
The closure system combines different materials with complementary properties: slats made of metal or rigid polymer for strength, elastomeric materials for cushioning and friction engagement, and reinforced composite structures. This composite approach allows the closure to simultaneously achieve flexibility for coiling and rigidity for resisting prying forces.
2Ease of operation
If the closure slats are allowed to overlap for coiling, then the closure can be retracted, but the slats may overlap improperly creating gaps that allow unauthorized access
Solution Approach 1:
The spacers are pre-positioned between slats to maintain proper spacing and prevent overlapping before the closure is subjected to prying forces or during retraction. This preliminary structural arrangement ensures that slats remain in correct alignment throughout the coiling process, preventing gaps from forming that could allow unauthorized access.
Solution Approach 2:
The closure system incorporates mechanisms that provide feedback on slat positioning and engagement. Sensors or mechanical indicators detect whether slats are properly aligned and spaced, and can trigger alerts or prevent operation if improper overlapping is detected, ensuring reliable gap prevention during retraction.
3Strength
If the closure is made rigid to prevent deformation, then resistance to prying forces improves, but the closure cannot coil about the shaft for retraction
Solution Approach 1:
The closure system employs dynamic characteristics where the overall structure remains rigid for resisting prying forces, but individual components (slats) are designed to flex and move relative to each other. This dynamic design allows the closure to coil about the shaft during retraction while maintaining rigidity when in the extended protective position, resolving the contradiction between strength and 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 closure system effectively prevents unauthorized access by maintaining structural integrity and limiting deflection distances, ensuring the closure remains secure even under significant vertical forces, thus enhancing security and preventing prying attempts.
Implementation Method 1
The closure may deflect by a first deflection distance when a vertical force is applied to the closure. The closure with the strap coupled thereto may deflect by a second deflection distance when the vertical force is applied to the closure. The first distance may be at least 100 percent more than the second deflection distance.
Data Source
AI summary
A closure system may include a closure movable between an extended state and a retracted state. The closure may be configured to at least partially obstruct an opening in the extended state and allow access through the opening in the retracted state. The closure may include a first portion and a second portion opposite the first portion. The closure may deflect by a first deflection distance when a vertical force is applied to the closure. The closure system may include a strap coupled to the first portion of the closure. The closure with the strap coupled thereto may deflect by a second deflection distance when the vertical force is applied to the closure. The first deflection distance may be at least 100 percent more than the second deflection distance.