Hair Brush Bristle Retention via Through-Hole Carrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hair brushes experience bristle loosening and popping free from the cushion with repeated use, leading to discomfort and inefficiency in detangling hair.
Innovation Solution
The hair brush design features bristles with through-holes for secure attachment to a carrier, made of silicone rubber, which is soft and inert, providing better anchoring and reduced likelihood of bristle detachment, along with stiff bristles and a hyperbolic paraboloidic frame for improved comfort and detangling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bristles are secured to a flexible cushion using conventional methods, then the brush can be manufactured simply, but the bristles become loose and pop free with repeated use
Solution Approach 1:
The bristle attachment structure is segmented into distinct functional zones: an undercut region that provides lateral retention, a through-hole that provides axial retention, and a base region that distributes stress. This segmentation allows each zone to address specific failure modes of bristle detachment independently.
Solution Approach 2:
The carrier is inserted through the through-hole of the bristle root, creating a nested configuration where the carrier thread passes through the central axis of the bristle. This nested arrangement maximizes the engagement between the carrier and bristle while minimizing the overall attachment structure complexity.
2Object-affected harmful factors
If the carrier is formed of a relatively soft and/or inert material, then user comfort and chemical resistance are improved, but bristle security deteriorates
Solution Approach 1:
The carrier exhibits local quality variations: it is soft and inert in the regions contacting the scalp and hair for comfort and chemical resistance, while forming a relatively thin, robust thread in the through-hole region for mechanical retention. This localized differentiation allows simultaneous optimization of comfort and bristle security.
Solution Approach 2:
The carrier can be formed as a composite structure or use a graded material that combines the benefits of soft, inert materials (for comfort and chemical resistance) with regions of higher structural integrity (for bristle retention).
3Ease of manufacture
If gaps form between bristles and carrier, then manufacturing is simpler, but hair trapping and dirt accumulation increase
Solution Approach 1:
The carrier is designed with an undercut and through-hole geometry that preliminarily establishes gap-free contact with the bristle root before the brush enters service. This preliminary geometric configuration ensures that no gaps can form during normal use, preventing hair and debris accumulation without complicating manufacturing.
4Reliability
If the through-hole diameter is relatively small, then bristle retention is improved, but the carrier thread becomes thinner and more vulnerable
Solution Approach 1:
The carrier thread strength is enhanced by utilizing the longitudinal dimension (length of the thread through the bristle root) rather than increasing the transverse dimension (thread diameter). The extended engagement length in the through-hole provides sufficient retention strength without requiring a thicker, more vulnerable thread.
5Strength
If bristle shafts are relatively thick, then bristle stiffness and resistance to deformation are improved, but comfort may deteriorate if tips are pointed
Solution Approach 1:
The bristle exhibits local quality variation along its length: the shaft has a relatively thick diameter for stiffness and structural integrity, while the tip has a rounded end geometry for comfort. This local differentiation allows the bristle to simultaneously provide structural strength and comfortable contact with the scalp.
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 enhances bristle security, comfort, and detangling effectiveness by preventing bristle loosening, reducing hair trapping, and allowing for deeper penetration and easier tangle removal without causing discomfort.
Implementation Method 1
the carrier may be formed of an elastomer. More particularly, the carrier may be formed of silicone rubber
Implementation Method 2
each bristle comprises a through-hole into which the carrier projects
Data Source
AI summary
A brush is described that includes a plurality of bristles secured to a carrier. Each bristle includes a through-hole into which the carrier projects.