Slit Blade Block with Segmented Combs for Skin-Friendly Shaving

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Solution Overview

Problem

Existing slit blade blocks in electric razors efficiently shave body hair but cause significant skin stimulation.

Innovation Solution

A slit blade block design featuring a slit outer blade with outer blade pieces spaced apart in a specific direction and a comb component with protrusions that guide hair into the slits, reducing skin contact and enhancing shaving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If combs are provided outside the slit outer blade to improve whisker introduction properties, then hair shaving efficiency is improved, but skin stimulation increases

Engineering Contradiction:

Improvehair shaving efficiencyVSAvoidskin stimulation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The comb component is divided into multiple individual combs spaced apart from each other, with each comb having a tooth that can independently guide hair. This segmentation allows hair to be introduced into slits more effectively while distributing the contact area to reduce concentrated skin stimulation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The comb teeth extend in a direction perpendicular to the blade pieces, creating a three-dimensional hair introduction pathway. This dimensional arrangement allows hair to be guided into the slits from multiple angles, improving shaving efficiency while the spaced arrangement of combs reduces skin contact concentration.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If outer blade pieces are spaced apart to improve hair introduction, then productivity is improved, but skin contact area increases causing more stimulation

Engineering Contradiction:

Improvehair introduction efficiencyVSAvoidskin contact and stimulation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The comb component acts as an intermediary between the skin and the blade pieces. The comb teeth guide hair into the slits formed by spaced blade pieces, enabling effective hair introduction while the comb structure itself provides a cushioning layer that reduces direct skin contact with the blade edges.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The comb teeth are positioned at specific locations between the blade pieces, providing localized hair guidance exactly where needed. This local arrangement improves hair introduction efficiency at the critical interfaces while maintaining larger overall spacing between blade pieces to minimize skin contact area.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250236031A1Slit blade block and electric razor

Publication Date: 2025.07.24 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The present disclosure provides a slit blade block and an electric razor capable of more efficiently shaving body hair while suppressing stimulation to skin. The slit blade block according to the present disclosure includes a slit outer blade having a plurality of outer blade pieces extending in a first direction and spaced apart from each other along a second direction intersecting the first direction. The slit blade block further includes a comb component comprising a plurality of combs that are disposed outside the slit outer blade in the first direction and spaced apart from each other along the second direction. The comb component comprises a protrusion protruding outward in the first direction, and the protrusion includes a first protrusion extending across two or more of combs disposed side by side in the second direction.