Integrally Formed Makeup Brush With Glue-Free Bristle Retention
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Solution Overview
Problem
Existing makeup brushes face issues with bristle detachment from the handle due to glue-free assembly methods, leading to poor connection reliability, complex assembly, excessive components, and high costs.
Innovation Solution
An integrally-formed makeup brush is created through injection molding, where a bristle cluster with protrusions engages with grooves on a sleeve and a plug, forming a secure connection without glue, using materials like polylactic acid, polyethylene terephthalate, or polybutylene terephthalate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flared skirt edge is inserted into the handle without glue, then environmental protection requirements are satisfied, but the bristle cluster is prone to detachment from the handle
Solution Approach 1:
The patent combines the bristle cluster, sleeve, and handle into an integrally-formed structure through injection molding. The bristle cluster roots are embedded directly into the handle cavity, eliminating the need for separate glue application while ensuring strong mechanical bonding between components.
Solution Approach 2:
The invention introduces engagement features including protrusions on the bristle cluster roots that fit into grooves on the sleeve, and additional protrusions on the sleeve that engage with grooves on the handle. This segmented engagement structure provides multiple mechanical interlocking points to prevent detachment.
2Reliability
If a connecting piece with elastic pieces and clamping assembly is introduced to enhance connection reliability, then the bristle cluster is securely fixed, but the assembly becomes complex with excessive components
Solution Approach 1:
The patent merges the connecting piece functionality directly into the handle structure through injection molding. The handle includes integrated cavities and engagement features that perform the securing function without requiring separate elastic pieces or clamping assemblies.
Solution Approach 2:
The invention extracts the complex elastic pieces and clamping assembly from the structure, replacing them with a simplified integrally-formed handle that incorporates all necessary engagement features directly into the molded structure.
3Reliability
If multiple elastic pieces and clamping assemblies are used to secure the bristle cluster, then connection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple components (bristle cluster, sleeve, handle) into a single integrally-formed assembly through injection molding. This eliminates the need for separate elastic pieces and clamping assemblies, reducing part count and manufacturing cost while maintaining assembly stability.
Solution Approach 2:
The handle is designed as a multi-functional component that simultaneously provides structural support, bristle cluster retention, and alignment features through its integrally-formed cavities and engagement structures, eliminating the need for dedicated separate components.
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 solution provides a reliable, simple, and cost-effective assembly with fewer components, ensuring the bristle cluster remains securely attached to the handle, reducing environmental impact and production complexity.
Implementation Method 1
the brush head assembly and the handle are integrally formed through injection molding
Implementation Method 2
the at least two protrusions engage with the second groove, and the at least two bearing bosses engage with the first groove; and the at least two protrusions are clamped between the plug and the annular boss
Implementation Method 3
the plug is embedded in the sleeve, and the plug is in zero-clearance fit with the sleeve
Data Source
AI summary
A glue-free integrally-formed makeup brush includes a handle and a brush head assembly integrally formed. The brush head assembly includes a bristle cluster, a sleeve and a plug. A root of the bristle cluster is provided with at least two protrusions, and a first groove is provided between adjacent protrusions. A first end of the sleeve is connected with the handle, and an inner wall of a second end of the sleeve is provided with an annular boss. An end surface of the annular boss facing towards the handle is provided with at least two bearing bosses, and a second groove is provided between adjacent two bearing bosses. The protrusions are engaged with the second groove, and the bearing bosses are engaged with the first groove.