Slide Fastener Blocking Element Asymmetry
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Solution Overview
Problem
Existing slide fasteners allow for compatibility between standard elements from different suppliers, making it difficult for original suppliers to prevent engagement and thus competition from replacement products.
Innovation Solution
Incorporating a blocking element and blocking coupling elements with unique contours on one stringer, which do not engage with standard elements from another stringer, ensuring compatibility only between specific configurations, preventing engagement with non-compatible stringers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard elements with the same contour are used on both stringers, then engagement compatibility is achieved allowing replacement products to compete, but the original supplier cannot prevent unauthorized competition
Solution Approach 1:
The patent applies asymmetry by providing different contours for elements on the first stringer versus the second stringer. Specifically, the first stringer has elements with a first contour while the second stringer has elements with a second contour that is different from the first contour. This asymmetric design ensures that only the specific pairing of first and second stringers can engage properly, preventing replacement products from either stringer from competing with the original paired configuration.
2Reliability
If blocking elements with different contours are introduced, then engagement compatibility is restricted to specific configurations, but device complexity increases
Solution Approach 1:
The patent applies local quality by making the contour difference a specific local characteristic of the elements rather than changing the entire fastener system. The blocking elements maintain the basic element structure and function but incorporate a specific contour variation at the engagement surface. This localized differentiation achieves the protection goal while minimizing overall system complexity.
Data Source
AI summary
Various implementations include a slide fastener that has a blocking element on one stringer that prevents engagement compatibility with standard elements on the other stringer. For example, at least one blocking element is coupled to a first stringer, and first and second blocking coupling elements are coupled to a second stringer. The contour of the blocking element and the contour of the blocking coupling elements are different from the contour of the standard elements on the stringers such that the standard elements do not engage with the blocking element or the blocking coupling elements in an alternating arrangement. However, the contour of the blocking element and contour of the blocking coupling elements allow for the engagement of the blocking element with the blocking coupling elements in an alternating arrangement.