Slider with Concave Release Portions for Fabric Biting Prevention
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Solution Overview
Problem
Existing slide fasteners often bite into fabrics due to the design of the slider, particularly when the front end protrudes in an inverted U-shape or V-shape, leading to fabric entrapment and insufficient biting prevention even with additional covers, which increase costs.
Innovation Solution
The design incorporates an upper wing plate, a lower wing plate, and a guide pillar with a Y-shaped element path, featuring concave portions on the front end sides of the wing plates and a guide pillar with a decreasing width, allowing the slider to engage and disengage element rows without expanding its size, reducing fabric biting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slider front end protrudes in an inverted U-shape or V-shape to close the fastener, then the fastening function is achieved, but fabric is likely to be bitten between the element row and the slider
Solution Approach 1:
The patent introduces a release portion that protrudes from the front surface of the slider body toward the element row side. This release portion acts in advance to push the fabric away from the biting zone between the element row and the slider, preventing fabric entanglement before it can occur during the fastening operation.
Solution Approach 2:
The slider body is segmented into functional regions: the main body for engagement, the release portion protruding toward the element row for fabric management, and the shoulder openings for element passage. This segmentation allows each part to perform its specific function independently, with the release portion specifically addressing fabric biting without compromising the overall fastening mechanism.
2Object-affected harmful factors
If the V-shaped part is expanded to release fabric from the intermediate bottom, then fabric biting is reduced, but the slider size increases unnecessarily
Solution Approach 1:
Instead of expanding the entire V-shaped part of the slider, the patent introduces a localized release portion that protrudes only from the front surface toward the element row. This local modification addresses fabric biting at the critical front engagement zone without increasing the overall slider volume, maintaining a compact design while preventing fabric entanglement.
3Object-affected harmful factors
If a cover is attached to the slider to prevent fabric biting, then fabric protection is improved, but the cost increases due to additional parts
Solution Approach 1:
The patent integrates the fabric protection function directly into the slider body by forming a release portion as an integral part of the slider. This merging of functions eliminates the need for separate protective covers, reducing the number of parts and simplifying the overall structure while maintaining effective fabric protection during operation.
Solution Approach 2:
The release portion of the slider serves dual functions: it maintains the structural integrity of the slider for fastening operations and simultaneously performs fabric protection by pushing fabric away from the biting zone. This self-service approach eliminates the need for additional protective components.
Data Source
AI summary
A slide fastener includes a pair of left and right fastener stringers each having an element row at each of opposing edge portions of left and right fastener tapes, and a slider configured to engage the element rows by moving forward between the pair of left and right fastener stringers and to disengage the element rows by moving backward. The slider includes an upper wing plate, a lower wing plate , a guide pillar for connecting the upper wing plate to the lower wing plate, a Y-shaped element path defined between the upper wing plate and the lower wing plate, left and right shoulder openings that are open forward the element path, and a rear opening that is open backward the element path.