Coiled Cord Design With Alternating Layers
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Solution Overview
Problem
The existing coiled cord structure with cables spirally wound in the same plane leads to an increased winding diameter in the orthogonal plane when extended or contracted, limiting the length of the cable and requiring more housing space.
Innovation Solution
A coiled cord design with alternating layers of cable winding from the inner to the outer side and vice versa, forming a nesting structure that maintains posture and prevents diameter increase, integrated into a displacement apparatus to enhance cable length and reduce housing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cables are spirally wound in the same plane to house the coiled cord in a flat housing space, then the housing space thickness is reduced, but the winding diameter in the orthogonal plane becomes large
Solution Approach 1:
The patent applies nesting by stacking multiple cable layers in a nested configuration where inner layers are positioned within the curvature of outer layers. This allows the coiled cord to maintain a compact cross-sectional diameter while accommodating longer cable lengths through the nested arrangement, effectively resolving the contradiction between housing space thickness and winding diameter.
Solution Approach 2:
The patent transitions from a two-dimensional planar spiral winding to a three-dimensional nested structure. By adding the vertical stacking dimension and configuring layers to nest within each other, the design achieves compactness in the cross-sectional plane while extending cable length through the third dimension, thus reducing winding diameter without compromising housing space efficiency.
2Length of moving object
If multiple layers of cables are stacked to increase cable length, then the cable length increases, but the structural stability and posture maintenance become difficult
Solution Approach 1:
The nested configuration of multiple cable layers provides inherent structural stability. Each inner layer is supported by the curvature of outer layers, creating a self-reinforcing structure that maintains posture. This nesting arrangement allows multiple layers to be stacked for increased cable length while the interlocking geometry prevents collapse and maintains structural integrity.
Solution Approach 2:
The patent creates a composite structure by integrating multiple cable layers into a unified nested assembly. The interaction between layers forms a composite system where the collective structure provides greater stability than individual layers, enabling posture maintenance while accommodating extended cable lengths through the multi-layer configuration.
3Length of moving object
If the coiled cord is extended and contracted frequently, then the displacement amount increases, but the local loads on the cable increase causing damage
Solution Approach 1:
The nested layer configuration distributes mechanical loads across multiple cable layers during extension and contraction cycles. When the coiled cord is subjected to displacement, the nested structure allows load sharing between inner and outer layers, reducing peak local stresses on any single cable. This load distribution mechanism enhances cable durability while maintaining the ability to achieve large displacement amounts.
Data Source
AI summary
The present disclosure provides a coiled cord capable of increasing the length of a cable while preventing a winding diameter of the coiled cord in a plane orthogonal to the direction in which the coiled cord is extended and contracted in a natural state from increasing. A first exemplary aspect is a coiled cord around which a cable is wound, the cable being capable of being freely extended and contracted, the coiled cord including: a first layer in which the cable is wound from an inner side of the coiled cord to an outer side thereof in a radial direction, and a second layer in which the cable is wound from the outer side of the coiled cord to the inner side thereof in the radial direction, in which the first and the second layers are continuously connected to each other.