Flat Brush Fastening Structure Without Adhesive Detachment Risk
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Solution Overview
Problem
Conventional cosmetic applicators with flat brushes use adhesives that are environmentally unfriendly, prone to detachment, and require complex manufacturing processes involving aluminum tubes, increasing costs and compatibility issues with chemical agents.
Innovation Solution
A plastic rod with a conic joining member and axial positioning hole secures a flat brush without adhesives, using a complementary shape for fastening, simplifying the manufacturing process and ensuring secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to fasten the brush to the aluminum tube and the aluminum tube to the plastic rod, then the components can be connected together, but the adhesive is not environmentally friendly and is compatible with some chemical agents causing detachment risk
Solution Approach 1:
The invention removes the aluminum tube and adhesive from the fastening system. The brush handle is directly fastened to the plastic rod through a positioning hole and tightening structure, eliminating the intermediate aluminum tube component and the adhesive substance that caused chemical compatibility issues.
Solution Approach 2:
The invention replaces the chemical bonding method (adhesive) with a mechanical fastening system. The positioning hole in the plastic rod and the corresponding tightening structure on the brush handle create a mechanical connection that is both reliable and chemically inert.
2Ease of manufacture
If an aluminum tube is used to connect the brush and the plastic rod, then the components can be assembled, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The invention extracts and removes the aluminum tube from the assembly. The brush handle is directly inserted through a positioning hole in the plastic rod and secured with a tightening structure, reducing the number of components and simplifying the manufacturing process.
Solution Approach 2:
The invention merges the functions of connection and positioning into a single integrated structure. The positioning hole in the plastic rod and the tightening structure on the brush handle work together as a unified fastening system, eliminating the need for separate aluminum tube and adhesive components.
3Shape
If the aluminum tube is flattened to form a flat brush, then the brush shape is achieved, but the conventional flat brush cannot be directly fastened in the cylindrical plastic rod
Solution Approach 1:
The invention prepares the fastening structure in advance by creating a positioning hole in the plastic rod and a corresponding tightening structure on the brush handle before assembly. This preliminary preparation enables direct fastening without requiring post-assembly flattening or shaping operations.
Solution Approach 2:
Instead of shaping the brush to fit the cylindrical rod, the invention inverts the approach by creating a positioning hole in the rod that accommodates the brush handle's tightening structure. This reverses the traditional fitting approach and enables direct fastening of the flat brush in the cylindrical plastic rod.
Data Source
AI summary
A cosmetic applicator is provided. The applicator includes a rod including a conic joining member at a first end, the joining member having a first surface and a second surface both tapering toward the first end, an axial positioning hole open to the first end, and two aligned through holes each having a first end open to a surface thereof and a second end communicating with the positioning hole; and a flat brush partially fastened in the positioning hole and including an application portion exposed outside of the joining member, and a flat combined portion secured to a blind end of the positioning hole. The through holes are disposed in proximity to the blind end of the positioning hole and the combined portion is disposed between the through holes.