Intruder-Resistant Screen Clamping for Faster Mesh Assembly
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Solution Overview
Problem
Existing intruder resistant screens, such as the Crimsafe Security System, require significant effort to assemble due to their weight and design, which can be taxing, especially for standard-sized doors, despite using lightweight components.
Innovation Solution
The improved intruder resistant screen features a frame with multiple extruded aluminum frame members and corner stakes, using short carbon fibre reinforced polymer clamp elements with self-drilling screws that provide leveraged clamping, reducing the need for extensive drilling and distributing clamping force more efficiently across the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If full-length clamping members are used with multiple screws, then intruder resistance is improved, but assembly time and labor effort increase significantly
Solution Approach 1:
The clamping member is divided into multiple discrete clamp elements distributed along the frame member, with each clamp element requiring only a single screw. This segmentation maintains the distributed clamping force needed for intruder resistance while dramatically reducing the number of fastening operations required during assembly.
Solution Approach 2:
The clamp elements are designed to be self-positioning through engagement with the frame member geometry, eliminating the need for precise alignment and multiple adjustment operations. The single-screw design allows for quick self-service installation without requiring complex fastening procedures.
2Strength
If multiple clamp elements are used per frame member, then clamping force distribution is improved, but device complexity increases
Solution Approach 1:
The clamping system is segmented into multiple identical, simple clamp elements rather than one complex full-length clamping member. Each segment performs the same basic function independently, simplifying the design of individual components while achieving superior force distribution through their collective arrangement.
Solution Approach 2:
The design changes from a continuous clamping member to discrete clamp elements, fundamentally altering the parameter of clamping force application from distributed along a length to concentrated at multiple discrete points. This parameter change achieves better force distribution while reducing component complexity.
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
This design enhances impact strength and reduces manufacturing time by distributing clamping force effectively and using lightweight materials, making assembly less labor-intensive and improving overall performance.
Implementation Method 1
Each fastener has a drilling portion, a shank portion, a head and a thread
Implementation Method 2
a plurality of clamp elements engaging with the frame members to hold the mesh by a leveraged clamping action
Data Source
AI summary
An intruder resistant screen providing improved strength. The improved intruder resistant screen comprises a frame, a woven wire intruder resistant mesh covering an opening enclosed by the frame, a plurality of clamp elements engaging with frame members to hold the mesh by a leveraged clamping action and at least one fastener holding each clamping member to the frame member. Each fastener has a drilling portion, a shank portion, a head and a thread. The frame comprises multiple frame members joined by corner stakes and there are two or more clamp elements engaging each frame member.