Slider Cutout Region for Insert Pin Access and Fastener Guidance
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Solution Overview
Problem
Existing sliders for slide fasteners face issues with reduced engagement performance due to lack of guidance by the upper blade and increased size, which complicates the insertion of the insert pin and may cause contact with the wearer when fully closed.
Innovation Solution
A slider design featuring a cutout region on the upper blade that sandwiches the guide post, with a pull tab attachment portion and flanges, allowing easy insertion of the insert pin while maintaining engagement performance by guiding fastener elements with both the upper and lower blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lower blade and guide post are extended in front of the upper blade to facilitate insert pin insertion, then ease of operation is improved, but device complexity and size increase
Solution Approach 1:
The slider body is divided into distinct functional segments: the upper blade with cutout region for insert pin access, the lower blade with placement portion for fastener element positioning, and the guide post for alignment. This segmentation allows each component to perform its specific function without requiring extension of other components, thereby facilitating insert pin insertion while maintaining compact overall structure.
Solution Approach 2:
The cutout region in the upper blade creates a three-dimensional access path that allows the insert pin to be inserted from the side rather than requiring the lower blade to extend forward. This dimensional change in the insertion approach eliminates the need for blade extension while maintaining ease of operation.
2Ease of operation
If the lower blade and guide post are extended in front of the upper blade, then ease of operation is improved, but the slider may contact the wearer when fully closed
Solution Approach 1:
By separating the insert pin insertion function (handled by the cutout region in the upper blade) from the fastener element guidance function (handled by the lower blade and guide post), the invention eliminates the need to extend the lower blade and guide post forward. This prevents potential contact with the wearer while maintaining ease of insert pin insertion through the cutout region.
3Device complexity
If fastener elements are guided only by the lower blade, then device complexity is reduced, but engagement performance deteriorates
Solution Approach 1:
The guidance function is segmented between multiple components: the upper blade with cutout region provides lateral guidance, the guide post provides longitudinal alignment, and the lower blade with placement portion provides final positioning. This distributed guidance system maintains engagement performance while avoiding the need for any single component to be excessively complex or extended.
Solution Approach 2:
The upper blade serves dual functions: it provides structural support for the slider body and simultaneously guides fastener elements through its cutout region. The lower blade similarly provides both structural support and guidance through its placement portion. This multi-functionality maintains engagement performance without requiring additional dedicated guidance components.
Data Source
AI summary
A slider for slide fastener includes: a slider body including an upper blade and a lower blade which are separate from and face each other in an upward and downward direction, and a guide post which connects the upper blade and the lower blade on a front end side; and a pull tab which is attached to the slider body. A cutout region is formed in at least one of both sides in a width direction of the upper blade, the both sides in the width direction sandwiching the guide post. The cutout region is formed of a side edge portion extending toward an outer side in the width direction of the guide post and being arranged along a front and rear direction, and a front edge portion.