Recessed Decorative Elements in Slide Fastener Coupling Elements

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Solution Overview

Problem

Conventional slide fasteners face challenges in maintaining the strength and flexibility of plastic coupling elements while providing an attractive appearance, as they are prone to damage from foreign materials like errant plastic fibers, and decorative elements like beads and crystals are difficult to secure and protect from wear and damage.

Innovation Solution

The coupling elements are designed with recessed decorative elements that do not protrude beyond the surface, allowing for secure adhesion and protection, and the use of plastic materials for both coupling elements and sliders, with a design that ensures smooth slider movement and close packing for aesthetic and functional benefits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If coupling elements are made from plastics material to reduce cost and improve manufacturing, then ease of manufacture and cost are improved, but the coupling elements become prone to damage from foreign materials like errant plastic fibers

Engineering Contradiction:

Improveease of manufactureVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary action by incorporating recesses into the coupling elements during the molding process, before the product is put into service. These recesses are designed to trap and retain errant plastic fibers, preventing them from causing damage later. The coupling elements are also designed with rounded edges from the outset to prevent fiber generation. This preliminary structuring ensures that when foreign materials do arise, they are contained and do not compromise the reliability of the fastening mechanism.

Inventive Principle:

Principle #10Preliminary action

2Shape

If decorative elements like beads and crystals are added to enhance appearance, then aesthetic appeal is improved, but the complexity of securing and protecting these elements increases

Engineering Contradiction:

Improveaesthetic appealVSAvoiddevice complexity

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The patent merges the decorative function with the structural function of the coupling elements. The recesses that provide structural benefits (trapping fibers, rounding edges) are simultaneously used to secure decorative elements. The decorative elements are embedded within the recesses, so their attachment is integrated into the existing structural design rather than adding separate attachment mechanisms. This merging reduces overall complexity while achieving both aesthetic and functional goals.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies the nesting principle by placing decorative elements within the recesses of the coupling elements. The recesses act as protective housings that contain the decorative elements, shielding them from external damage while allowing them to be visible and aesthetic. This nested structure protects the decorative elements without requiring additional protective layers or complex mounting mechanisms.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Shape

If decorative elements protrude from the surface for visibility, then aesthetic appeal is improved, but the decorative elements become vulnerable to wear and damage

Engineering Contradiction:

Improveaesthetic appealVSAvoidwear and damage

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #7Nested doll (Nesting)

4Shape

If coupling elements are designed with holes or indents for ornamentation, then aesthetic appeal is improved, but the likelihood of plastic fibers arising increases

Engineering Contradiction:

Improveaesthetic appealVSAvoidplastic fibers

Core Design Contradiction:

ShapeVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by carefully designing the recesses with specific geometric characteristics - smooth transitions, rounded corners, and continuous surfaces in critical areas. The recesses are shaped to minimize stress concentration points where fibers could initiate. The local geometry of the recesses is optimized to maintain structural integrity while providing space for decorative elements, ensuring that the specific local structure prevents fiber generation rather than promoting it.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2696718B1Decorated slide fastener

Publication Date: 2016.07.20 YKK CORP

Figure 1
Figure 2a~2b
Figure 2c

AI summary

A slide fastener (10) including a pair of first and second stringers (2, 3) each including a tape (5a, 5b) and a row of coupling elements (7) mounted on one longitudinal edge of the tape; wherein each of the coupling elements includes a first non - connecting portion (40) and a second connecting portion (41) and wherein the second connecting portion includes a head portion (91) and a body portion (92); and wherein the first non- connecting portion includes an attachment surface (22) to which a decorative element (20) is attached and the attachment surface has a first surface (22a) and a second surface (22b) lower than the first surface. The decorative element is attached to the second surface.