Composite Cable Net for Suicide Prevention
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Solution Overview
Problem
Current suicide-prevention barriers face challenges in providing a structurally sound and vandal-proof deterrent while maintaining visual appeal, as they are often difficult to design with both strength and aesthetics in mind, and existing nets can be easily cut using common tools.
Innovation Solution
A composite cable net is created by knitting a strong, fibrous cord around a metal wire core, requiring multiple tools to cut, making it difficult to sever, combining stainless steel cables with aramid fibers and a sheath to form a durable, aesthetically pleasing barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal wire core is used to provide structural strength, then the net becomes resistant to deformation, but it becomes vulnerable to cutting with bolt cutters
Solution Approach 1:
The patent combines metal wire core with aramid fibers and polyethylene sheathing to create a composite cable structure. The metal core provides structural strength and rigidity, while the aramid fibers and polyethylene layers provide resistance to cutting tools. This composite structure resolves the contradiction by integrating materials with complementary properties - the metal maintains structural integrity while the surrounding layers deter cutting attempts.
2Reliability
If a thick cable is used to prevent cutting, then the net becomes more vandal-proof, but it reduces visual appeal
Solution Approach 1:
The patent uses a thin polyethylene sheathing that envelops the metal core and aramid fibers. This thin film provides cutting resistance while maintaining a sleek, visually appealing appearance. The sheathing is thin enough not to compromise aesthetics but sufficiently robust to prevent easy cutting, resolving the contradiction between vandal resistance and visual appeal.
3Reliability
If aramid fibers are knitted around the cable, then cutting resistance improves, but the complexity of manufacture increases
Solution Approach 1:
The patent employs a nested structure where aramid fibers are knitted around the metal core, which is then enclosed by a polyethylene sheathing. Each layer is integrated within the previous layer, creating a compact composite cable. This nesting approach allows for systematic manufacturing where each component is prepared and then assembled in sequence, reducing overall manufacturing complexity while achieving superior cutting resistance.
Data Source
AI summary
A net is formed by joining cables which are over-knitted with cord. A cable may be made of wire or stainless-steel cable. A composite cable is a cable that is over-knitted with cord to form a composite cable. The cord may be made of fibrous material and in some embodiments is made of aramid fibers. Adjacent composite cables are joined at regular intervals to form a net. In some embodiments, composite cables are composed of cable with an over-knitted cord, inter-knitted at junctions that are spaced at regular intervals to form a net. The individual cables are over-knitted with cord and the junctions are formed as the over-knitted cords are inter-knitted.