Split-Line Razor Blade Geometry for Lower Tip Pressure

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Solution Overview

Problem

Current razor blades with symmetrical shapes do not fully optimize shaving geometry, leading to suboptimal shaving performance and potential skin irritation.

Innovation Solution

The development of asymmetric razor blades with a split line passing through the tip, defining asymmetric sections and a bevel shoulder on one section to reduce tip pressure and enhance skin-contacting performance, while maintaining a sharp cutting edge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If symmetrical razor blade shape is used, then manufacturing is simple, but shaving performance is suboptimal and causes skin irritation

Engineering Contradiction:

Improveblade manufacturing simplicityVSAvoidshaving performance consistency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies asymmetry by designing the razor blade with a split line that divides the blade into asymmetric first and second sections. The first section has a first bevel and the second section has a second bevel with different geometry, creating an asymmetric blade shape that optimizes shaving performance while maintaining manufacturing feasibility through standard metallurgical processes.

Inventive Principle:

Principle #4Asymmetry

2Productivity

If blade exposure is increased to improve cutting performance, then cutting efficiency improves, but skin irritation increases

Engineering Contradiction:

Improvecutting efficiencyVSAvoidskin irritation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating different bevel configurations in different sections of the blade. The first section has a first bevel angle and the second section has a second bevel angle, allowing each section to have optimized local geometry for its specific function - one section for primary cutting and the other for secondary cutting and skin protection.

Inventive Principle:

Principle #3Local quality

3Reliability

If asymmetric blade design is implemented to optimize shaving geometry, then shaving performance improves, but manufacturing complexity increases

Engineering Contradiction:

Improveshaving geometry optimizationVSAvoidblade structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the blade into distinct first and second sections separated by a split line. Each section can be independently designed with specific bevel geometry, allowing for optimized shaving performance while enabling modular manufacturing approaches that reduce overall complexity.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12576547B2Razor blade

Publication Date: 2026.03.17 THE GILLETTE CO

AI summary

A razor blade is provided comprising a substrate comprising a first portion and a second portion. The first portion may comprise first and second generally parallel outer surfaces. The second portion may comprise first and second sections separated by a split line. The first section may comprise a first facet extending directly from the first outer surface of the first portion and an end facet extending directly from the first facet. The second section may comprise an end facet. The end facets of the first and second sections may converge at a tip to define a cutting edge. The split line may pass through the tip and is generally parallel with and extends between the first and second outer surfaces of the first portion.