Slide Fastener Stop With Segmented Plates And Orientation Feature
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Solution Overview
Problem
Existing slide fastener stops have complex shapes, uneven surfaces, and difficulty in automatic orientation, leading to reduced holding strength and a rough feel, which complicates manufacturing and correct attachment.
Innovation Solution
A stop design featuring a top plate and bottom plate linked by a connecting post, with a flat lower side on the top plate and sloping leg members on the bottom plate, allowing for smooth attachment and decoration, and an uneven member for automatic orientation detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If complex shapes with flanges and projections are used to improve holding strength, then holding strength is improved, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The stop is divided into two separate plates (top plate and bottom plate) that are crimped onto opposite sides of the fastener tape. This segmentation allows each plate to have a simpler, flatter geometry while collectively providing the same holding function through distributed crimping points, reducing overall shape complexity while maintaining holding strength.
Solution Approach 2:
The holding mechanism transitions from relying on complex 3D geometric interlocking (flanges and projections) to utilizing the dimensional advantage of dual-sided crimping. By distributing holding points across both top and bottom plates, the system achieves equivalent or superior holding strength through spatial distribution rather than geometric complexity.
2Strength
If deep central grooves and uneven surfaces are used in the bottom plate, then structural integrity is improved, but the surface feels rough and uncomfortable in use
Solution Approach 1:
By separating the structural function (providing integrity) from the surface function (providing smoothness), each plate can be optimized independently. The bottom plate can have internal reinforcement structures for strength while maintaining a flat external surface for comfort, as the structural integrity comes from the crimping mechanism and material selection rather than surface geometry.
Solution Approach 2:
The bottom plate is designed with differentiated local qualities: the crimping regions have specific geometric features for structural integrity and holding power, while the outer surfaces remain flat and smooth for user comfort. This local differentiation allows simultaneous optimization of both strength and surface quality.
3Ease of manufacture
If symmetric designs are used for simplicity, then manufacturing is simplified, but automatic detection of longitudinal orientation becomes difficult
Solution Approach 1:
An asymmetric marking feature (such as a protrusion, recess, or pattern) is introduced to one of the plates to provide longitudinal orientation information. This minimal asymmetric element breaks the symmetry just enough to enable automatic detection systems to identify the correct orientation during assembly, while the overall structure remains simple and easy to manufacture.
Solution Approach 2:
The asymmetric orientation feature is localized to a specific region of the stop rather than requiring asymmetric design throughout the entire component. This allows the majority of the stop structure to remain simple and symmetric for ease of manufacture, while a small localized feature provides the necessary orientation information for automatic detection.
4Productivity
If die casting is used to manufacture complex stops, then production capability is maintained, but manufacturing cost and complexity increase
Solution Approach 1:
The stop is segmented into two simpler plates that can be manufactured using less complex processes such as stamping, pressing, or forming. This segmentation reduces the need for complex die casting operations while maintaining production capability through alternative high-volume manufacturing methods that are simpler and potentially more cost-effective.
Solution Approach 2:
The manufacturing approach changes from die casting (a high-complexity, high-cost process) to simpler forming or stamping processes. This parameter change in the manufacturing method is enabled by the simplified geometry of the segmented plates, allowing production capability to be maintained through alternative processes that are easier and more economical.
Data Source
AI summary
There is provided a stop for a slide fastener. A top plate and a bottom plate are linked with one another at a transversely intermediate position by an integral connecting post. The lower side of the top plate is substantially flat. The bottom plate slopes away from the connecting post to form two leg members provided with a respective end flange pointing towards the top plate, the leg members being adapted to cooperate in use with the top plate to retain fastener tapes therebetween.