Fan Brush Cosmetic Applicator Ferrule Design
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Solution Overview
Problem
Conventional cosmetics brushes with cylindrical fiber bundles face issues such as fiber twisting and difficulty in returning to their original shape, leading to uneven cosmetic application and inconvenience in applying cosmetics at a constant thickness and width.
Innovation Solution
A cosmetics brush design featuring a ferrule with a tapered insertion groove that allows the fiber bundle to fan out, maintaining a spread formation and utilizing a fixing piece to secure the fibers, enabling uniform application and improved cosmetic distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical fiber bundle is used in a cosmetics brush, then the brush structure is simple and easy to manufacture, but the fiber bundle twists in viscous cosmetics and cannot return to its original shape, resulting in uneven cosmetic application
Solution Approach 1:
The patent applies asymmetry by changing the fiber bundle cross-section from circular to oval shape, and designing the ferrule with a groove that creates an asymmetric internal structure. This asymmetric design prevents the fiber bundle from twisting in viscous cosmetics while maintaining ease of manufacture, as the oval cross-section and grooved ferrule can be easily formed during manufacturing processes.
Solution Approach 2:
The patent utilizes curvature by giving the fiber bundle an oval cross-section instead of a circular one, and creating a grooved ferrule with curved surfaces. The curved oval shape provides better resistance against twisting forces from viscous cosmetics compared to a circular cross-section, while the grooved ferrule's curved surfaces guide and maintain the fiber bundle's shape during application.
2Device complexity
If a cylindrical fiber bundle is used in a cosmetics brush, then the brush structure is simple, but the fiber bundle has weak force of restitution and difficulty in returning to its proper shape
Solution Approach 1:
The oval cross-section of the fiber bundle creates an asymmetric structure that inherently provides better shape recovery. When the fiber bundle is compressed or deformed, the asymmetric oval shape creates restoring forces that more effectively return the bundle to its original configuration compared to a symmetric circular cross-section.
Solution Approach 2:
The curved oval cross-section of the fiber bundle enhances its elastic properties and force of restitution. The curved geometry distributes stress more effectively during deformation, allowing the fiber bundle to return to its proper shape more reliably after being compressed in viscous cosmetics.
3Ease of manufacture
If a cylindrical fiber bundle is used in a cosmetics brush, then the brush is easy to manufacture, but it is disadvantageous for applying cosmetics at a constant thickness and width
Solution Approach 1:
The oval cross-section of the fiber bundle provides a more stable and consistent application surface compared to a circular cross-section. This asymmetric shape maintains constant thickness and width during cosmetic application, preventing the twisting and deformation that occurs with cylindrical bundles, while remaining easy to manufacture through standard molding processes.
Solution Approach 2:
The curved oval cross-section of the fiber bundle creates a more uniform application surface that maintains constant thickness and width. The smooth curved geometry distributes cosmetic product evenly across the application area, improving consistency without complicating the manufacturing process.
Data Source
AI summary
A cosmetics brush for applying cosmetics. The brush includes a rod, a ferrule formed at the end of the rod, the ferrule defining an insertion groove, and a bundle of fibers inserted in the ferrule. The insertion groove extends from an opening to a closed end and is defined by opposed side walls and opposed front and rear inside walls. The opposed side walls taper toward one another moving from the opening to the closed end.