Multilayer Slide Fastener Independent Layer Control
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Solution Overview
Problem
Existing slide fasteners with a multilayer structure require all layers to be opened and closed simultaneously, lacking independent control over each layer, which can lead to instability and unintended engagement or disengagement.
Innovation Solution
A novel slide fastener design featuring a multilayered structure where each fastener unit is overlaid on another, with specific engagement and holding pieces forming arrow-head, hook-like, or flat head shapes to ensure stable and independent operation of each layer, allowing for sequential opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer structure is used to provide waterproof and safe properties, then the reliability and waterproofing are improved, but all layers must be opened and closed simultaneously which reduces the ease of operation and independence of each layer
Solution Approach 1:
The slide fastener is divided into multiple independent fastener units, each with its own elements and engagement mechanism. Each fastener unit can be opened and closed independently through the slider, allowing selective operation of individual layers while maintaining the overall multilayer waterproof structure.
Solution Approach 2:
The patent introduces a vertical stacking dimension by arranging fastener units in multiple layers (first fastener unit, second fastener unit, etc.) with engagement holding portions and engagement portions that interlock vertically. This allows independent horizontal operation of each layer while maintaining vertical integration for waterproofing.
2Stability of the object's composition
If a multilayer structure with simultaneous opening and closing is used, then the structural stability is improved, but unintended engagement or disengagement occurs reducing the reliability
Solution Approach 1:
By segmenting the fastener into distinct fastener units with separate engagement holding portions and engagement portions, the patent prevents unintended interaction between layers. Each unit operates independently, eliminating the problem of simultaneous opening/closing causing unintended engagement or disengagement.
Solution Approach 2:
The engagement holding portions and engagement portions act as intermediaries that control the interaction between layers. These specialized components allow stable vertical interlocking while preventing unintended horizontal engagement between different fastener units, ensuring reliable operation.
3Ease of manufacture
If elements are arranged in a line along edges of opening/closing ends, then the ease of manufacture is improved, but the ability to form stable multilayered structure is reduced
Solution Approach 1:
The patent extends the element arrangement from a simple linear configuration to a three-dimensional configuration with vertical stacking. Elements are arranged in lines along edges of opening/closing ends horizontally, while engagement holding portions and engagement portions create vertical interlocking between layers, achieving stable multilayered structure.
Solution Approach 2:
The fastener units are nested vertically with the engagement holding portions of one unit fitting into the engagement portions of another unit. This nesting arrangement creates a stable multilayered structure while maintaining the simplicity of linear element arrangement within each unit.
Data Source
AI summary
The slide fastener includes elements and a slider, wherein each of the elements includes a horizontal functional section an upper vertical functional section and a lower vertical functional section the slide fastener includes a plurality of fastener units in each of which the elements are arranged to oppositely face each other and the meshing portions are meshed with each other by sliding the slider between the oppositely-positioned elements, whereby the engagement pieces of the oppositely-positioned elements form an engagement portion and the engagement holding pieces of the oppositely-positioned elements in pair form an engagement holding portion, and the plurality of fastener units are constituted in a multilayered structure by engaging the engagement holding portions of a second fastener with the engagement portions of a first fastener such that the engagement holding portions of a new fastener unit are engaged with the engagement portions of a preceding fastener unit.