Beadless Metal Frame Assembly for Intrusion-Resistant Fenestration
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Solution Overview
Problem
Modern fenestration units are vulnerable to home intrusion due to easily removable beads and lower strength materials like uPVC, which can be exploited to gain access into buildings.
Innovation Solution
A beadless frame assembly with metallic frame members, mitre joints, and connectors secured by fasteners, featuring grooves for panel reception and corner spacers for precise panel positioning, enhancing security and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional beads are used to secure panels in frame assemblies, then the assembly process is simplified, but the fenestration unit becomes vulnerable to home intrusion as beads are easily removable
Solution Approach 1:
The invention removes the traditional bead component entirely from the system. Instead of using a bead to secure the panel, the panel is directly received within grooves formed by the frame members themselves. This extraction of the bead eliminates the security vulnerability while maintaining panel retention through the groove structure.
Solution Approach 2:
The groove structure acts as an intermediary mechanism between the frame members and the panel. Rather than using a separate bead component, the grooves provide a built-in retention mechanism that secures the panel through its geometric configuration, preventing removal while simplifying the overall assembly.
2Ease of manufacture
If uPVC material is used for frame members, then manufacturing cost is reduced, but the material can be easily drilled or broken to enable access to the bead
Solution Approach 1:
The invention changes the material parameter of the frame members from uPVC to metal. This material substitution provides significantly higher strength and resistance to drilling or breaking while maintaining the groove-based panel retention system. The metallic material inherently prevents the vulnerability to mechanical compromise that plagues plastic materials.
3Strength
If frame members are made from metal instead of uPVC, then security and strength are enhanced, but manufacturing complexity increases
Solution Approach 1:
The frame assembly is segmented into multiple frame members, each independently formed with grooves. This segmentation allows each metal component to be manufactured separately using standard metal forming processes, then assembled together. The modular approach reduces the complexity of manufacturing large monolithic metal frames while maintaining the security benefits of metallic construction.
4Productivity
If traditional pre-assembled frame assemblies are used, then production efficiency is improved, but the bead is accessible from the exterior enabling intrusion
Solution Approach 1:
The invention extracts the bead component from the traditional pre-assembled frame system. By removing the bead entirely and using grooves for panel retention, the security vulnerability of external bead access is eliminated while maintaining efficient pre-assembly capabilities for the frame members themselves.
Data Source
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AI summary
A first aspect of the invention provides a beadless frame assembly for a fenestration unit, the frame assembly comprises a plurality of metallic frame members, preferably aluminium, and a plurality of connectors. Each frame member comprises a pair of bevelled edges configured to interface with a respective bevelled edge of a neighbouring frame member so as to form a mitre joint. The plurality of connectors are configured to secure neighbouring frame members at each of the respective of mitre joints. Each of the frame members further comprise a groove for receiving a panel of the fenestration unit, therefore enabling a panel to be secured within the frame assembly without requiring a bead. The level of security provided by the frame assembly is therefore improved.