Metallic Button Back with Polygonal Umbrella Part
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Solution Overview
Problem
Conventional buttons used in jeans and similar garments face issues with maintaining a circular shape on the front surface and preventing the shell cap from rotating, especially when made from aluminum or aluminum alloys, which are more deformable than brass, leading to reduced attachment force and aesthetic concerns.
Innovation Solution
A metallic button back design featuring a cylindrical part with a radially extending umbrella part that includes a first bending part with a polygonal shape and flat plates, enhancing the strength and rigidity of the umbrella part, while allowing the shell cap to be securely attached in a circular manner, preventing rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer periphery of the umbrella part is formed in a polygonal shape to prevent shell cap rotation, then the shell cap is prevented from rotating, but it becomes hard to form the front surface of the button to be a beautiful circle
Solution Approach 1:
The invention divides the umbrella part's outer periphery into two distinct segments: a polygonal first bending part for anti-rotation and circular flat plates for aesthetics. This segmentation allows each part to fulfill its specific function independently - the polygonal shape prevents shell cap rotation while the circular flat plates maintain the button's beautiful circular appearance from the front
Solution Approach 2:
The invention applies different geometric qualities to different parts of the same component. The first bending part has a polygonal shape with corners and sides to provide rotational resistance, while the flat plates extending from the sides have a circular outer periphery to ensure aesthetic appearance. This local differentiation of geometric properties resolves the contradiction between functional and aesthetic requirements
2Loss of substance
If aluminum or aluminum alloy is used to reduce material costs, then material costs are reduced, but the umbrella part becomes easily deformed and attachment force is lowered
Solution Approach 1:
The invention creates a composite structure by combining aluminum or aluminum alloy with a specific geometric configuration (polygonal first bending part with flat plates). This composite approach allows the use of cost-effective aluminum materials while the engineered geometry provides the necessary strength and deformation resistance that pure material selection could not achieve alone
Solution Approach 2:
The invention utilizes curved surfaces and geometric forms to enhance structural performance. The flat plates extending from the polygonal first bending part create a composite geometry that distributes stress more effectively, reducing deformation in aluminum materials and maintaining attachment force despite using lighter, less expensive aluminum alloys
Data Source
AI summary
A button back which makes it possible to form the front surface of a button to be a circular shape; a shell cap hard to be rotated; and an umbrella part hard to be deformed. The button back is made of metal, including a cylindrical part and an umbrella part extending radially outward from one axial end of the cylindrical part. The umbrella part includes a first bending part which extends radially outward from the one axial end of the cylindrical part and then bends on the opposite side of the cylindrical part. An outer periphery, including a radially outer end, of the first bending part has a polygonal shape including at least three corners and sides which extend between two circumferentially adjacent corners. The umbrella part includes flat plates extending radially outward from the radially outer end, corresponding to the sides, of the first bending part.