Braided Core Knitted Outer Cord Knot Security
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Solution Overview
Problem
Conventional cords have limited variability in appearance and structural strength due to their smooth surface, which makes them prone to loosening when tied and requires complex processing steps.
Innovation Solution
A cord design featuring a core material with braided first strands and an outer layer of knitted second strands, providing a concave-convex surface for increased friction and durability, with the outer layer being movable to maintain stretchability and protect the core from abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cord uses a smooth flat or round rope structure, then the manufacturing process is simple, but the friction force is insufficient causing the cord to loosen easily when tied
Solution Approach 1:
The cord is segmented into multiple functional layers: a core material layer and an outer layer, each with distinct structures. The outer layer is further segmented into multiple strands that can be independently knitted, creating a complex multi-layer architecture that enhances knot holding ability while managing structural complexity
Solution Approach 2:
The cord employs a nested structure where the outer layer of knitted strands envelops the core material. This nested arrangement allows the outer layer to provide friction and knot security while the core maintains structural integrity, resolving the contradiction between reliability and complexity through hierarchical organization
2Adaptability or versatility
If a conventional cord uses a single weaving method, then the processing steps are reduced, but the appearance variability is limited
Solution Approach 1:
The cord combines different material types and structures - the core material (which can be various fibers) and the outer layer (knitted strands). This composite approach enables diverse appearance options through material selection while maintaining a consistent dual-layer structural framework, thus achieving versatility without excessive complexity
Solution Approach 2:
Different regions of the cord have different properties: the core material provides structural foundation while the outer knitted layer provides aesthetic variety and friction. This local differentiation allows appearance variability in the outer layer without complicating the overall cord structure, as each layer serves its specific function
3Reliability
If a conventional cord has a smooth outer surface, then the structural strength is reduced, but the friction force is also insufficient causing easy loosening
Solution Approach 1:
The outer layer strands are formed with curved and convoluted paths rather than straight lines, creating a concave-convex surface profile. This curvature increases surface area and friction for better knot holding while the distributed nature of the curves maintains overall structural strength, resolving the contradiction between reliability and strength
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 cord is resistant to loosening when tied, offers diverse appearance options, and enhances structural strength and durability through a combination of frictional resistance and wear-resistance from the knitted outer layer.
Implementation Method 1
The plurality of second strands 21 provides the cord with a relatively concave-convex outer surface so that the cord is not easy to loosen when tied
Implementation Method 2
The core material includes a plurality of first strands braided with one another. The outer layer is disposed around the core material and includes a plurality of second strands knitted with one another
Data Source
AI summary
A cord is provided, including: a core material and an outer layer. The core material includes a plurality of first strands braided with one another, and the outer layer is disposed around the core material and includes a plurality of second strands knitted with one another.