Snap Fastener Radial Protrusions Prevent Fabric Rotation

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Solution Overview

Problem

Existing snap fasteners that resist water migration often compromise on holding strength or damage waterproof fabrics due to their design, and they tend to rotate or slide relative to the fabric, leading to hole enlargement and increased water migration.

Innovation Solution

The use of radially offset patterned circles of non-penetrating gripping protrusions that securely grip the fabric without penetrating it, providing a watertight seal and preventing rotation or sliding, thus maintaining effective holding strength and resisting water migration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If flat opposed surfaces are used to attach snap fasteners to fabric, then water migration resistance is provided, but fabric holding or gripping power is weak

Engineering Contradiction:

Improvewater migration resistanceVSAvoidfabric holding strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The flat surface is segmented into multiple discrete gripping protrusions arranged in radial patterns. This segmentation allows the snap fastener to maintain water migration resistance through continuous fabric contact while significantly improving gripping power through concentrated localized pressure points that penetrate and secure the fabric effectively.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The surface geometry is changed from uniform flat to non-uniform with radial gripping protrusions. This creates local quality variations where specific areas (protrusion tips) have high penetration capability for strong gripping, while the overall pattern maintains continuous fabric contact for water migration resistance.

Inventive Principle:

Principle #3Local quality

2Strength

If gripping pins are used to increase gripping strength, then fabric holding power is improved, but the fabric is damaged and water migration increases

Engineering Contradiction:

Improvefabric holding strengthVSAvoidfabric damage and water migration

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

Instead of single deep-penetrating pins, the gripping function is segmented into multiple radial protrusions that distribute the gripping force. This segmentation provides sufficient holding strength while reducing individual penetration depth, preventing fabric damage and maintaining water migration resistance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gripping mechanism transitions from vertical pin penetration to a combination of radial and vertical protrusion elements. This dimensional change allows the protrusions to engage fabric fibers in multiple directions, providing strong gripping without the need for deep single-direction penetration that causes damage.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Object-affected harmful factors

If snap fasteners are attached to waterproof fabric, then they provide some water migration resistance, but the fasteners rotate or slide relative to the fabric

Engineering Contradiction:

Improvewater migration resistanceVSAvoidposition stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The symmetrical flat surface is replaced with an asymmetric radial pattern of gripping protrusions. This asymmetric pattern creates directional gripping forces that resist rotation and sliding, while the radial arrangement ensures continuous fabric contact for water migration resistance.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The gripping protrusions are pre-configured in radial patterns that automatically engage fabric fibers upon attachment. This preliminary configuration of gripping elements prevents rotation and sliding from occurring, rather than relying on friction alone after attachment.

Inventive Principle:

Principle #10Preliminary action

4Strength

If gripping protrusions penetrate the fabric, then gripping strength is increased, but hole enlargement occurs and water migration increases

Engineering Contradiction:

Improvegrip strengthVSAvoidhole size control

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The single deep-penetrating grip is segmented into multiple shallower radial protrusions. This segmentation distributes the gripping force across multiple contact points, providing sufficient grip strength while minimizing individual penetration depth, thus preventing hole enlargement and maintaining water migration resistance.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS7617575B2Water migration resistant snap fasteners

Publication Date: 2009.11.17 YKK CORP

AI summary

Snap fasteners are attached to a fabric or substrate and resist water migration from one side of the fabric or substrate to an opposite side of the fabric or substrate. The water migration resistant snap fasteners resist water migration through the fabric to which the snap fastener is attached while maintaining secure attachment to the fabric. The water migration resistant snap fasteners have radially offset patterned circles of gripping protrusions which do not penetrate through the fabric. Also, the radial patterned circles of gripping protrusions securely grip the fabric and maintain the snap fasteners in the proper location on the fabric.