Slide Fastener Coupling Element Flat Surface Design
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Solution Overview
Problem
Existing slide fasteners with coupling elements tend to form hollow surfaces instead of flat ones when attached to tape, leading to aesthetic issues and potential deformation, which can hinder engagement and ornament application.
Innovation Solution
Incorporating transversely opposing recesses at the inner proximal portions of the leg members in the anchoring end portion of the coupling element, allowing for improved force distribution and preventing the formation of hollow surfaces, resulting in a closely packed, aesthetically pleasing arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupling element is attached to the slide fastener tape using conventional clamping methods, then the anchoring end portion grasps the tape, but hollow surfaces form on the front portions of the coupling element, degrading aesthetic appearance and potentially causing deformation
Solution Approach 1:
The coupling element is divided into three distinct portions: connecting end portion, anchoring end portion, and intermediate portion. This segmentation allows each portion to be optimized independently - the anchoring end can apply clamping force while the intermediate portion maintains the flat front surface geometry, resolving the contradiction between secure anchoring and aesthetic appearance
Solution Approach 2:
Different portions of the coupling element are given different local properties: the anchoring end portion has geometry optimized for grasping the tape, while the front portions of all three portions are designed with smooth, coplanar surfaces for aesthetic appearance. This local differentiation allows the clamping function to be separated from the aesthetic surface, eliminating hollow formation while maintaining anchoring strength
2Shape
If the coupling elements are arranged in a closely-packed configuration, then aesthetic appearance is improved, but the operation and engagement mechanism becomes more constrained
Solution Approach 1:
The coupling element design separates the engagement function to the rear portions while allowing front portions to form a closely-packed coplanar arrangement. The engagement mechanism operates in the longitudinal dimension at the rear, while the aesthetic closely-packed appearance is achieved in the transverse dimension at the front, resolving the contradiction between tight packing and operational ease
Data Source
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AI summary
Provided is a coupling element (1) for use in a slide fastener (SF). A connecting end portion (2), an anchoring end portion (3) and an intermediate portion (4) are arranged along a longitudinal axis (L-L), such that when the coupling element (1) is attached to a tape (T), the connecting end portion (2) faces away from the tape (T), the anchoring end portion (3) grasps the tape (T). In the connecting end portion (2), a front portion (2f) is adapted to be juxtaposed to that of opposing coupling elements (1), so as to form therewith a closely packed arrangement, and a rear portion (2t) is engageable with that of the opposing coupling elements (1). In the anchoring end portion (3), front and rear portions (3f, 3r) form leg members (3g) which extend away from the intermediate portion (4) while defining a groove (5) therebetween, and which are adapted to be clamped onto the tape (T). In the groove (5), a pair of recesses (5b) opposing in a direction transverse to the longitudinal axis (L-L) are provided at inner proximal portions of the leg members (3g), adjacent the intermediate portion (4).