Trimming Blade Head With Chamfered Comb Teeth

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Solution Overview

Problem

Existing trimming blade systems with combs have a reduced active blade length and are prone to hair clogging, leading to inefficiencies in hair trimming due to the gap between comb teeth and the blade, requiring more strokes and promoting clogging.

Innovation Solution

The trimming blade system incorporates chamfered faces on the lower and lateral surfaces of the teeth, and stepped teeth with rearwardly directed shoulders, increasing the active blade length and reducing hair clogging by optimizing the geometry of the comb and blade interaction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a comb is provided in the trimming blade system, then hair separation and precise trimming is improved, but the active length of the blade is reduced

Engineering Contradiction:

Improvetrimming precisionVSAvoidactive blade length

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The patent introduces chamfered faces on the teeth that extend in a direction oblique to both the longitudinal axis and the cutting edge. This third-dimensional geometry allows the comb teeth to guide hair effectively while minimizing the space occupied by the teeth themselves, thereby preserving more active blade length.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If a comb is provided in the trimming blade system, then hair separation is improved, but hair clogging increases due to gap between teeth and blade

Engineering Contradiction:

Improvehair separationVSAvoidhair clogging

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the geometric parameters of the comb teeth by adding chamfered faces with specific angles. This changes the way hair interacts with the teeth-blade interface, allowing hair to be guided smoothly onto the cutting edge without getting trapped in gaps, thus reducing clogging while maintaining separation effectiveness.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If traditional blade geometry is used with comb, then more strokes are required, but this promotes clogging and reduces efficiency

Engineering Contradiction:

Improvenumber of hairs cut per strokeVSAvoidtrimming efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The chamfered faces on the comb teeth perform a preliminary guiding action on the hair, pre-positioning it optimally for cutting. This preliminary alignment ensures that each stroke cuts the maximum number of hairs efficiently, reducing the total number of strokes needed and preventing clogging from repeated strokes.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10442097B2Trimming blade head and a razor comprising a razor handle and such a trimming blade head

Publication Date: 2019.10.15 BIC VIOLEX SA

AI summary

A trimming blade system has a front and includes a supporting plate, a blade, and a cover plate. The blade has a cutting edge facing forwardly toward the front of the trimming blade system. The trimming blade system has a comb provided with teeth which project forwardly toward the front of the trimming blade system and which overlap the cutting edge. Each of the teeth has an upper face, two lateral faces, and a lower face. The lower face of each of the teeth is joined to the lateral faces by opposite chamfered faces.