Reverse Opening Slider End Stop Preventing Unintentional Separation
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Solution Overview
Problem
Conventional reverse opening type separable end stops for slide fasteners fail to prevent unintentional movement of the reverse opening type slider when disposed on the upper side of an article, leading to separation of fastener elements without intentional operation.
Innovation Solution
The design incorporates a contact portion on the insert pin and box pin that securely engages the locking pawl, preventing the reverse opening type slider from moving inward and ensuring smooth insertion by avoiding collisions and providing a wide contact area for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reverse opening type separable end stop is disposed on the upper side of an article, then the slider can be positioned for new usage styles, but the slider may move downward due to its own weight and separate fastener elements unintentionally
Solution Approach 1:
The patent applies preliminary anti-action by providing a contact portion on the insert pin that proactively prevents the slider from moving downward due to gravity. The contact portion is positioned to engage the locking pawl before unintentional separation can occur, creating a preventive mechanism that counteracts the gravitational force acting on the slider when disposed on the upper side of an article.
2Reliability
If a contact portion is provided on the insert pin to prevent slider movement, then reliability is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by adding the contact portion only at the specific location on the insert pin where it is needed to engage the locking pawl. Rather than redesigning the entire insert pin structure, the solution locally modifies the insert pin by providing a contact portion at the appropriate position, thus preventing slider movement while minimizing overall structural complexity.
3Reliability
If the contact portion is positioned to engage the locking pawl, then secure locking is achieved, but collision during insertion may occur
Solution Approach 1:
The patent applies preliminary action by carefully positioning the contact portion at a location that allows the locking pawl to engage it after the insert pin has been properly inserted into the slider. The contact portion is positioned such that it does not interfere with the insertion process itself, but rather becomes effective after insertion is complete, thus achieving secure locking without causing collision during insertion.
Data Source
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AI summary
The present invention provides a reverse opening type separable end stop having a mechanism which securely locks a reverse opening type slider (1) on a surface of an insert pin (4) or a box pin (3), thereby blocking the slider (1) from needlessly moving inward. The reverse opening type separable end stop is constituted of a reverse opening type slider (1), a box pin (3) and an insert pin (4). The insert pin (4) or the box pin (3) is provided with a contact portion (13) with which a locking pawl (35) provided on the reverse opening type slider (1) mounted on a fastener chain (5) can always make contact by colliding an end surface thereof in an opening/closing direction at an end portion of the fastener chain (5), so that the contact portion (13) is locked by the locking pawl (35). Consequently, the reverse opening type slider (1) is prevented from automatically moving inward of the fastener chain (5) needlessly, whereby a high quality reverse opening type separable end stop is ensured.