Female Snap Button With Alternating Wall Thickness
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Solution Overview
Problem
Conventional synthetic-resin female snap buttons require high precision in flexibility, leading to increased mating and demating forces and potential nonuniformity in detachment resistance, making them difficult to produce and prone to faulty operation.
Innovation Solution
A female snap button design featuring alternately arranged thick-walled and thin-walled portions in the annular protrusion, reducing the need for high precision in flexibility and maintaining high detachment resistance by varying the radial thickness, thereby reducing the mating and demating force and minimizing nonuniformity in the circumferential direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the annular protrusion has uniform thickness in the circumferential direction, then the flexibility is uniform, but very high precision is required for production and it is difficult to manufacture
Solution Approach 1:
The annular protrusion is designed with non-uniform thickness in the circumferential direction, creating thick-walled portions and thin-walled portions with different flexibilities. This local variation in geometry allows the structure to achieve the required flexibility characteristics without demanding high manufacturing precision, as the design inherently accommodates variability through its asymmetric thickness distribution.
2Reliability
If the annular protrusion has high detachment resistance, then the projection is securely held, but the force required to mate and demate increases
Solution Approach 1:
The annular protrusion features thick-walled portions that provide high detachment resistance to securely hold the projection, and thin-walled portions that require less force for mating and demating operations. This localized differentiation allows the structure to simultaneously achieve secure holding and ease of operation with reduced force requirements.
3Device complexity
If the annular protrusion has uniform flexibility, then the structure is simple, but nonuniformity in detachment resistance occurs due to faulty molding or long-term use
Solution Approach 1:
The annular protrusion is designed with asymmetric thickness distribution, creating distinct thick-walled and thin-walled portions arranged alternately in the circumferential direction. This asymmetric geometry inherently compensates for nonuniformity caused by faulty molding or long-term use, as the alternating pattern ensures that variations are distributed evenly around the circumference, maintaining consistent overall performance.
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 simplifies production by eliminating the need for precise flexibility, reduces the force required for mating and demating, and maintains consistent detachment resistance across the circumferential direction, enhancing the reliability of the snap button mechanism.
Implementation Method 1
the outer bulge of the projection first overlaps the inner bulge of the annular protrusion, which elastically displaces the annular protrusion radially outward
Implementation Method 2
the flexibility of the annular protrusion as being elastically deformed radially outward is uniform in the whole circumferential direction
Data Source
AI summary
A female snap button detachably receives a projection of a male snap button in a projection-receiving space. The female snap button includes an annular protrusion rising from a base and defining the projection-receiving space. In the annular protrusion, there are formed thick-walled portions with the thickness from the inner surface of the protrusion to the radially outer side being relatively thick and thin-walled portions with the thickness being thinner than that in the thick-walled portions. The thick-walled portions and the thin-walled portions are arranged alternately in the circumferential direction.