Rotatable Hair Iron with Segmented Heating Plates

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Solution Overview

Problem

Existing hair irons struggle to effectively curl hair when the heating plates are flat and struggle to straighten hair when the heating plates are curved.

Innovation Solution

A hair iron design featuring a first arm and a second arm that are rotatably connected, with a first holding member and a second holding member that are good thermal conductors, and a surface member between protrusions on the first arm, allowing for both curling and straightening of hair.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the opposing surfaces of the heating plates are flat, then it is suitable for straightening hair, but it is difficult to curl hair

Engineering Contradiction:

Improvestraightening capabilityVSAvoidcurling capability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The heating plate is divided into multiple regions with different surface characteristics: a first region with a flat opposing surface for straightening hair, and a second region with a curved opposing surface for curling hair. This segmentation allows the single heating plate to provide both straightening and curling functions, resolving the contradiction between straightening capability and curling capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the heating plate are given different local qualities: the first region has a flat surface quality optimized for straightening, while the second region has a curved surface quality optimized for curling. This local differentiation enables the heating plate to perform multiple styling functions simultaneously, addressing both straightening and curling needs.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the opposing surfaces of the heating plates are curved, then it is suitable for curling hair, but it is difficult to straighten hair

Engineering Contradiction:

Improvecurling capabilityVSAvoidstraightening capability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The heating plate is segmented into functional regions: a first region with curved opposing surface for curling and a second region with flat opposing surface for straightening. This segmentation enables the heating plate to deliver both curling and straightening effects, resolving the contradiction between curling capability and straightening capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The heating plate incorporates different local surface qualities: curved surface in the first region for effective curling and flat surface in the second region for effective straightening. This local quality variation allows the single heating plate to adapt to different styling requirements, simultaneously providing curling and straightening functions.

Inventive Principle:

Principle #3Local quality

3Productivity

If heating plates are used to generate heat for styling, then hair styling effectiveness is improved, but skin protection from direct heat contact becomes challenging

Engineering Contradiction:

Improvehair styling effectivenessVSAvoidskin heat exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Protrusions are introduced as intermediary elements between the heating plate and the user's skin. These protrusions create physical spacing that prevents direct contact between the hot heating plate and the skin, thereby reducing heat exposure and potential burns while maintaining the heating plate's styling effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protrusions serve as a pre-established protective barrier (cushioning) between the heat source and the skin. By designing the heating plate with protrusions that inherently prevent direct skin contact, the system proactively mitigates the harmful thermal effects before they can occur during use.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 hair iron can efficiently style hair both curly and straight by utilizing thermally connected heating plates and protrusions that protect the user's skin from direct heat contact.

Implementation Method 1

a film heater that generates heat when supplied with power

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

The surface member and at least one of the first holding member and the second holding member are good thermal conductors and are capable of generating heat based on heat from a heat source

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250143431A1Hair iron

Publication Date: 2025.05.08 YA MAN LTD

AI summary

A hair iron includes a first arm, a second arm, a first inner heating plate, a second inner heating plate, protrusions, and a first outer heating plate. The second arm is rotatably connected to the first arm. The first inner heating plate is located in a region of the first arm that faces the second arm. The second inner heating plate is located in a region of the second arm that faces the first inner heating plate. The protrusions are poor thermal conductors and located in a region of the first arm that does not face the second arm. The first outer heating plate is located between the protrusions. The first outer heating plate and at least one of the first inner heating plate and the second inner heating plate are good thermal conductors and generate heat based on heat from a heat source.