Flattened Anchoring Ring Press-Stud for Compact Snap Fasteners
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Solution Overview
Problem
Existing press-studs face challenges in minimizing axial space requirements while maintaining optimal hold, ease of opening, and long-term strength, with a need for a more economical and compact design.
Innovation Solution
A press-stud featuring a female element with a seat for a resiliently deformable anchoring ring having a flattened cross-section with cantilevered arcuate lips and U-shaped notches, held by an annular covering strip, which reduces axial dimensions and weight, and is produced using sheet-metal deformation for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional press-stud designs are used, then the hold strength and ease of operation are maintained, but the axial space requirement increases
Solution Approach 1:
The spring is transformed from a three-dimensional volumetric component into a two-dimensional flattened ring with cantilevered lips. This dimensional reduction allows the spring to achieve the same anchoring function while occupying significantly less axial space, directly resolving the contradiction between compactness and holding strength.
Solution Approach 2:
The conventional coiled spring mechanism is replaced with a flattened ring featuring cantilevered lips that engage with notches. This substitution maintains the elastic anchoring function through a different mechanical principle - the bending of cantilevered lips rather than coil compression - enabling reduced axial dimensions while preserving reliability.
2Ease of manufacture
If conventional press-stud designs are used, then the functional performance is maintained, but the device complexity and manufacturing cost increase
Solution Approach 1:
The spring body and anchoring elements are merged into a single flattened ring structure with integrated cantilevered lips. This eliminates the need for separate coiled spring components and simplifies the overall structure, making it more suitable for economical sheet-metal deformation manufacturing while reducing device complexity.
Solution Approach 2:
The spring geometry is fundamentally changed from a coiled three-dimensional form to a flattened two-dimensional ring with specific lip configurations. This parameter change simplifies the manufacturing process by enabling production through sheet-metal deformation rather than complex coiling operations, directly improving ease of manufacture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves a significant reduction in axial space and weight, ensuring strong snap hold and durability, suitable for lightweight applications like garments and accessories, with a compact size and cost-efficient manufacturing process.
Implementation Method 1
a resiliently deformable anchoring member which is to anchor a male element in a closed configuration of the stud
Data Source
AI summary
A press-stud comprises a female element having a seat in which is accommodated a resiliently deformable anchoring member (22) which is to anchor a male element in a closed configuration of the stud. The anchoring member is a ring having a flattened cross-section with an inner edge (24) on which are defined substantially freely bending arcuate lips (29) which project in a cantilevered manner from a support wall of the female element (10) by not more than one third of the width of the flattened cross-section of the anchoring ring (22). Preferably, the press-stud has an overall height, in the closed configuration, which does not exceed 2.5 mm, and a ratio between the diameter and the height which is greater than 3.5.