Concealed Slide Fastener Insert Pin Engagement Mechanism

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Solution Overview

Problem

Concealed slide fasteners face difficulties in determining the insertion state of the insert pin, leading to potential opening when lateral pulling force is applied, and excessive force can break the separable end stop or fastener elements.

Innovation Solution

A concealed slide fastener design with an insert pin having an engagement portion that engages with the lowermost fastener element, where the engagement portion's length is at least twice the interval between fastener elements, and a bulged portion on the box pin to enhance attachment strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the slider is forcibly pulled up without inserting the insert pin into the predetermined position, then the engagement portion enters into the interval between fastener elements and the slide fastener closes, but the slide fastener cannot endure lateral pulling force and may open while being used

Engineering Contradiction:

Improveease of closingVSAvoidreliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The engagement portion is designed to preliminarily engage with the lowermost fastener element before the insert pin is fully inserted into the box body. This preliminary engagement prevents the slider from moving in the closing direction unless the insert pin is properly inserted, thereby ensuring reliable fastening while maintaining ease of operation.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the slider is forcibly pulled up without inserting the insert pin into the predetermined position, then the slide fastener closes, but excessive force may break the separable end stop or fastener elements

Engineering Contradiction:

Improveease of closingVSAvoidstrength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The engagement portion provides a preliminary anti-action by engaging with the lowermost fastener element to prevent the slider from moving downward unless the insert pin is properly inserted. This prevents excessive force from being applied to the separable end stop or fastener elements during improper closing operations.

Inventive Principle:

Principle #9Preliminary anti-action

3Device complexity

Since fastener tapes and pieces of cloth are present on the front surface side, then it is more difficult to determine the insertion state of the insert pin

Engineering Contradiction:

Improveconcealed structureVSAvoiddetectability

Core Design Contradiction:

Device complexityVSDifficulty of detecting and measuring

Solution Approach 1:

The engagement portion acts as an intermediary mechanism that provides tactile feedback through engagement with the lowermost fastener element. This allows users to determine the insertion state of the insert pin by feeling whether the engagement portion is properly engaged, even when the fastener tapes and cloth are present on the front surface side.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8782859B2Concealed slide fastener

Publication Date: 2014.07.22 YKK CORP

AI summary

There is provided a concealed slide fastener. The slide fastener includes a pair of fastener tapes, a pair of fastener element rows, a slider, a box pin, a box body and an insert pin. The insert pin includes an insert portion configured to be inserted into a space of the box body and an engagement portion formed on a side surface of the insert portion, which faces the box pin and configured to be engaged with a lowermost one of the fastener elements of one of the fastener element rows which is close to the box pin. The length of the engagement portion is set to be at least twice an interval between the fastener elements.