Zipper Movable Pin Structure to Prevent Misinsertion

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional zippers lack an anti-misinsertion function, leading to frequent misalignment and deformation of zipper teeth, which affects user experience and increases the likelihood of zipper splitting off.

Innovation Solution

A zipper design featuring a movable pin with a teeth stop portion and a fixed pin with a boss portion that prevent the slider from being pulled when the movable pin is not fully inserted, along with a non-concave transition surface to avoid zipper teeth from getting stuck, enhancing the smoothness and preventing misinsertion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the movable pin is designed with a concave structure to accommodate zipper teeth, then the zipper teeth can be held in place, but the zipper teeth easily get stuck in the concave structure causing misinsertion and deformation

Engineering Contradiction:

Improvezipper engagement stabilityVSAvoidzipper teeth deformation and misinsertion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of using a concave structure that creates a trap for zipper teeth, the patent inverts the approach by using a convex teeth stop portion that protrudes from the movable pin. This convex structure actively prevents teeth from entering incorrect positions rather than passively allowing them to settle into a凹ave, thereby eliminating the misinsertion problem while maintaining engagement stability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The teeth stop portion is positioned on the movable pin to preemptively block zipper teeth from engaging incorrectly before misinsertion can occur. By placing this stop structure in advance on the movable pin, the design prevents the harmful action of teeth getting stuck or deforming, addressing the problem before it manifests

Inventive Principle:

Principle #9Preliminary anti-action

2Strength

If the movable pin is forcibly squeezed between zipper teeth during misinsertion, then the zipper teeth deform, but this deformation increases the probability of subsequent misinsertions

Engineering Contradiction:

Improvezipper teeth structural integrityVSAvoidzipper operation consistency

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The teeth stop portion preemptively prevents misinsertion by blocking incorrect tooth engagement before the movable pin can be forcibly squeezed between teeth. This preliminary prevention eliminates the chain reaction that leads to tooth deformation and subsequent operational failures

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The convex teeth stop portion acts as a protective buffer that prevents the harmful interaction between the movable pin and zipper teeth during misinsertion attempts, cushioning against the forces that would otherwise cause deformation and maintain reliable operation

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If the slider is pulled upward when the movable pin is not fully inserted, then the zipper may split off, but the conventional design allows this misinsertion to occur

Engineering Contradiction:

Improvezipper sliding operationVSAvoidzipper engagement accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The teeth stop portion on the movable pin preemptively blocks incorrect engagement before the slider can be pulled upward. By preventing misinsertion in advance, the design ensures that the slider only moves when properly engaged, eliminating the risk of zipper splitting while maintaining smooth operation

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentEP4699487A1zipper

Publication Date: 2026.02.25 ZHEJIANG WEIXING IND DEV

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

A zipper, comprising two side zipper tapes (6), a slider (4), an insertion portion (1), a fixed pin (2) and a movable pin (3). Either side zipper tape (6) is provided with zipper teeth (5), and the slider (4) is used for operating the zipper teeth (5) on two sides to engage with or be separated from each other; the fixed pin (2) is arranged on the zipper tape (6) on a first side, and the insertion portion (1) is arranged on the zipper tape (6) on the first side and can fit with the fixed pin (2); and the movable pin (3) is arranged on the zipper tape (6) on a second side, and the movable pin (3) is configured to be inserted into the insertion portion (1) and cooperate with the fixed pin (2), such that the zipper teeth (5) on the two sides engage with each other after the slider (4) is pulled. The side of the movable pin (3) that faces the fixed pin (2) is provided with a tooth stop portion, which is provided with a tooth stop face (31), and the tooth stop face (31) is configured to abut against the zipper teeth (5) on the first side when the movable pin (3) is not inserted in place, so as to prevent the slider (4) from crossing the tooth stop portion; and the tooth stop face (31) is connected to the movable pin (3) by means of a transition face (32), so as to prevent the zipper teeth (5) on the first side from being stuck in the movable pin (3).