Slider Recess Restoring Insert Pin Alignment
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Solution Overview
Problem
Conventional concealed type slide fasteners with separable bottom end stops face issues with insert pin alignment, as the insert pin tends to droop or tilt when inserted, leading to difficulties in smooth insertion and proper coupling of fastener stringers.
Innovation Solution
A recess is formed on the inner face of the slider's lower blade, sloped on both the diamond and rear mouth sides, to restore the insert pin to a parallel position relative to the fastener tape, ensuring smooth insertion and accurate coupling of fastener stringers, accommodating both right and left side insertion systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the insert pin is inserted without a restoring mechanism, then the insertion process is simple, but the insert pin droops or tilts causing insertion failure
Solution Approach 1:
The recess is pre-formed on the inner face of the lower blade to automatically restore the insert pin to the correct parallel position relative to the fastener tape during insertion. This preliminary geometric constraint ensures proper alignment before the insert pin engages with the box pin, eliminating the need for manual adjustment or complex guiding mechanisms.
2Manufacturing precision
If a recess is added to restore insert pin orientation, then insertion accuracy improves, but device complexity increases
Solution Approach 1:
Instead of redesigning the entire slider structure, only a localized recess is added to the inner face of the lower blade. This minimal structural modification creates the necessary restoring function while maintaining the overall simplicity of the slider design. The recess is positioned specifically to interact with the insert pin during insertion, providing alignment correction without affecting other components.
3Manufacturing precision
If the insert pin insertion hole is made smaller for precise coupling, then coupling accuracy improves, but insert pin insertability worsens
Solution Approach 1:
The recess performs the preliminary action of orienting the insert pin parallel to the fastener tape before the insert pin reaches the insertion hole. This pre-alignment ensures that even with a smaller, more precise insertion hole, the insert pin can be inserted smoothly without tilting or drooping, thereby maintaining both insertability and coupling accuracy.
Data Source
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AI summary
The present invention provides a slider for a concealed type slide fastener with a separable bottom end stop, capable of, when an insert pin is inserted with an abnormal status, restoring the status to a normal one. In the slider for a concealed type slide fastener with a separable bottom end stop, a recess (20) is provided in a shoulder mouth (15) of a lower blade (5) sideways of a diamond (6) erected from a body (2) of the slider (1) and a slope is formed on a side wall (21) sideways of the diamond (6) and a rear mouth (16) side of the recess (20). Consequently, even if the insert pin (28) is inserted with an abnormal condition, for example, such that the insert pin (28) is drooped in a vertical direction with respect to a fastener tape (22), the slope of the side wall (21) restores the fastener tape (22) into a parallel condition quickly and after that, the insert pin (28) can be inserted into a box (26), thereby attaching the bottom end stop smoothly and easily.