Oval Hair Roller with Concave Cross-Section for Secure Styling
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Solution Overview
Problem
Conventional round hair rollers limit hair styling options and struggle to retain large quantities of hair, causing hair to escape from the ends and making operation difficult.
Innovation Solution
A hair roller with an oval or concave oval cylindrical shape and a hair-retaining structure, such as bristles or Velcro, to securely hold hair, allowing for diverse styling and improved curl retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional round roller is used, then the structure is simple and easy to manufacture, but the hair styling options are limited and hair escapes from the ends
Solution Approach 1:
The patent applies asymmetry by changing the roller cross-section from a symmetric circle to an asymmetric oval shape. This asymmetric geometry allows the roller to accommodate hair portions more effectively, preventing hair escape while enabling diverse styling options including voluminous curls and sleek styles, thus resolving the contradiction between versatility and structural simplicity
Solution Approach 2:
The patent implements local quality by creating a concave oval cross-section where the curvature varies across different regions. The concave shape provides enhanced hair retention capability at specific locations while maintaining overall roller functionality, allowing different areas of the roller to serve different purposes in controlling hair behavior during styling
2Reliability
If a conventional round roller is used, then the manufacturing process is simple, but large quantities of hair escape from the roller ends
Solution Approach 1:
By transitioning from a symmetric circular cross-section to an asymmetric concave oval cross-section, the roller achieves superior hair retention reliability. The concave geometry creates a cradling effect that secures large quantities of hair at the roller ends, directly addressing the hair escape problem while remaining manufacturable through standard molding techniques
Solution Approach 2:
The patent changes the geometric parameters of the roller cross-section from a circle with uniform radius to an oval with varying curvature. This parameter modification, specifically creating a concave shape with different radius values at different locations, enhances the roller's ability to retain hair while maintaining ease of manufacture through conventional manufacturing processes
Data Source
AI summary
A hair roller for wrapping therearound a hair portion is a concave cylinder, which has a normally cross section at a top portion and a bottom portion thereof larger than a normally cross section at a middle portion thereof an oval cylinder; an oval cylinder, which has at least one normally oval cross-section; or a concave oval cylinder. The hair roller is optionally provided with a hair-retaining structure formed on the roller body for grabbing the hair portion.