Fixed Blade Structure with Convex Edges for Hair Cutter Heat Dissipation

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Solution Overview

Problem

Existing electric hair cutters with fixed blades suffer from inadequate heat dissipation, leading to discomfort for users due to skin contact and heat transfer during operation.

Innovation Solution

A fixed blade structure with a blade portion and connecting portion, featuring outer and middle convex edges that reduce skin contact and enhance heat dissipation through strategically designed grooves and convex edges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If heat dissipation holes are formed in the fixed blade to improve heat dissipation, then heat dissipation effect is improved, but processing requirement increases and manufacturing becomes time-consuming

Engineering Contradiction:

Improveheat dissipation effectVSAvoidprocessing requirement

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The fixed blade is divided into multiple blade segments (first blade segment, second blade segment, third blade segment) with different convex edge configurations. Each segment independently manages heat dissipation and skin contact, allowing optimized local designs without requiring complex hole patterns throughout the entire blade.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the fixed blade are assigned different surface characteristics: the first blade segment has convex edges for cutting, the second blade segment has recessed edges for reduced skin contact, and the third blade segment has convex edges for heat dissipation. This local differentiation resolves the contradiction by addressing heat dissipation needs in specific areas without complicating overall manufacturing.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the fixed blade contacts user's skin during operation, then cutting function is achieved, but heat transfer causes burning feeling and discomfort

Engineering Contradiction:

Improvecutting functionVSAvoidheat transfer to skin

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The harmful thermal energy is extracted from the contact interface by introducing recessed edges in the second blade segment that create air gaps between the blade and skin. This air layer acts as a thermal barrier, extracting heat from the direct contact path while preserving the cutting function through the adjacent convex edges.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

An air layer is introduced as an intermediary between the fixed blade and user's skin through the recessed edge design. This air intermediary layer reduces direct thermal conduction from the blade to the skin, minimizing burning feelings while allowing the blade to maintain its cutting function through the surrounding convex edges.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If convex edges are designed on the blade for cutting performance, then cutting efficiency is improved, but contact area with skin increases leading to more heat transfer

Engineering Contradiction:

Improvecutting efficiencyVSAvoidheat transfer to skin

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The blade is segmented into functional zones: the first and third blade segments have convex edges for cutting efficiency, while the second blade segment has recessed edges that reduce skin contact area. This segmentation allows the blade to simultaneously achieve high cutting efficiency where needed and minimize heat transfer where skin contact occurs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The blade edges are designed with asymmetric characteristics - convex edges in certain segments for cutting performance and recessed edges in other segments for reduced skin contact. This asymmetric design optimizes the trade-off between cutting efficiency and heat transfer by placing different edge types in different spatial locations.

Inventive Principle:

Principle #4Asymmetry

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 significantly reduces the contact area between the blade and the user's skin, minimizing heat transfer and discomfort, while improving heat dissipation for efficient operation.

Implementation Method 1

the upper surface of the first middle convex edge is lower than the upper surface of the outer convex edge... significantly reduce the contact area between the upper surface of the fixed blade body and the user's skin... the heat transferred to the user's skin during the operation of the fixed blade body and the movable blade is significantly reduced

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250170734A1Fixed blade structure

Publication Date: 2025.05.29 NINGBO ICLIPPER ELECTRIC APPLIANCE CO LTD

AI summary

A fixed blade structure includes a fixed blade body, the lower surface of the fixed blade body is attached to a movable blade; the fixed blade body further comprises a blade portion and a connecting portion, a blade end is integrally arranged at the front end of the blade portion, and the rear end of the blade portion is connected to the connecting portion; the blade end further comprises two outer blades located on two sides of the blade portion, and a plurality of middle blades evenly arranged between the two outer blades; the upper surface of the outer blade is provided with an outer convex edge, and the upper surfaces of at least a part of the middle blades are provided with first middle convex edges.