Blade Unit with Engaging Mechanism for Electric Razor

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Solution Overview

Problem

Conventional blade units for electric razors have a structure that allows outer blades to sink more than slit-shaped blades, leading to potential skin damage due to the edge of the tip of the slit-shaped blade.

Innovation Solution

The blade unit incorporates a comb-shaped outer blade and at least one mesh-shaped outer blade, with a mechanism that prevents the comb-shaped blade from projecting more than the mesh-shaped blades, utilizing a comb blade urging member, a mesh blade urging member, and an engaging mechanism to control the movement of the blades.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the comb-shaped outer blade is allowed to sink independently like other outer blades, then the blade unit can adapt to skin unevenness, but the comb-shaped blade projects more than mesh-shaped blades causing severe skin damage

Engineering Contradiction:

Improveadaptation to skin unevennessVSAvoidskin damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a dynamic control mechanism where the comb-shaped outer blade can sink independently within a predetermined range to adapt to skin unevenness, but when the predetermined range is exceeded, the engaging mechanism activates to make the comb-shaped blade sink in conjunction with mesh-shaped blades, preventing excessive projection and skin damage

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The engaging mechanism acts as an intermediary between the comb-shaped blade and mesh-shaped blades, controlling their relative movement. This mechanism includes engaging protrusions and recesses that activate when the predetermined sinking range is exceeded, coordinating the movement of different blade types to prevent skin damage

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the comb-shaped outer blade projects more than mesh-shaped blades to scoop up long hair, then hair scooping effectiveness is improved, but the edge of the tip causes severe damage to the skin

Engineering Contradiction:

Improvehair scooping effectVSAvoidskin damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts the projection state of the comb-shaped blade based on operational conditions. During normal operation, the comb-shaped blade projects to effectively scoop up long hair. When excessive projection is detected through the sinking mechanism, the engaging mechanism activates to coordinate the blades and prevent skin damage

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4067020B1Blade unit and electric razor

Publication Date: 2025.04.02 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

The present disclosure provides an electric razor that reduces damage to the skin during shaving. Electric razor (300) according to the present disclosure comprises head portion (320) that holds comb-shaped outer blade (100) and mesh-shaped outer blades (210) each extending in a first direction so as to be movable in a second direction intersecting the first direction, comb blade urging members (231) that urge comb-shaped outer blade (100) in the second direction, mesh blade urging members (232) that urge mesh-shaped outer blades (210) in the second direction, and engaging mechanism (240) that, when mesh-shaped outer blades (210) are moved toward unit base (230) against urging force of mesh blade urging members (232), moves comb-shaped outer blade (100) in a state where comb-shaped outer blade (100) does not project from mesh-shaped outer blades (210) with respect to unit base (230).