Slider Lower Flange Inclined Surface Reduces Tape Stress
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Solution Overview
Problem
Conventional sliders for slide fasteners often damage the fastener tape due to friction and stress concentration when repeatedly sliding, leading to thread cuts and tape breakage, especially when a strong lateral pulling force is applied.
Innovation Solution
The slider design features downwardly inclined surface portions on the lower flanges that incline toward the shoulder and outward, increasing the contact area and dispersing the load, while the upper flanges have upwardly inclining surface portions symmetric to the lower flanges, both chamfered and notched to reduce stress concentration and prevent hooking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sliders are used with standard flange designs, then the slider structure is simple and easy to manufacture, but the fastener tape is damaged due to stress concentration and friction during repeated sliding
Solution Approach 1:
The flange is designed with different surface characteristics at different locations: the contact surface with the fastener tape is inclined and chamfered to reduce stress concentration, while other parts maintain standard geometry. This local modification of surface quality addresses the tape damage issue without requiring complete redesign of the entire flange structure.
Solution Approach 2:
The flange contact surface is designed with inclined and chamfered geometry, creating curved and angled surfaces instead of sharp edges. This curvature and inclination distribute the contact stress more evenly across the fastener tape, preventing stress concentration and thread cutting during repeated sliding operations.
2Stress or pressure
If the flange contact surface is inclined and chamfered to disperse load, then stress concentration is reduced and tape damage is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The flange contact surface parameters (inclination angle, chamfer dimensions) are optimized to achieve stress distribution while remaining compatible with standard manufacturing processes. By carefully selecting these geometric parameters, the design achieves improved stress distribution that can be manufactured using conventional machining or molding techniques with minimal additional complexity.
3Ease of manufacture
If the slider structure is simplified without special flange modifications, then manufacturing is easier and costs are lower, but the fastener tape threads are cut and tape breaks during repeated use
Solution Approach 1:
Instead of simplifying the entire slider, the invention applies local quality modification only to the flange contact surfaces. The inclined and chamfered surfaces are added only where contact with the fastener tape occurs, leaving the rest of the slider structure simple and easy to manufacture. This localized approach reduces harmful friction and stress without significantly increasing overall manufacturing complexity.
Data Source
AI summary
A slider includes lower flanges placed on left and right side edges of a lower wing plate. Each of the lower flanges includes a downwardly inclined surface portion which is placed on the shoulder-opening-side tip portion on a side of its upper surface and on an outer side in a width direction of the slider, and which downwardly inclines toward a shoulder and downwardly inclines toward the outer side in the width direction of the slider. According to this, in a slide fastener having the slider, even if a sliding operation of the slider is repeated in the slide fastener, it is possible to avoid defects that the lower flange of the slider comes into sliding contact with the fastener tape and the fastener tape is broken, and it is possible to extend the life of the fastener tape.