Unitary Razor Blade Bent Portion Geometry

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Solution Overview

Problem

Conventional razor blades face challenges in maintaining shaving performance and rinsability due to increased drag force and reduced rinsability when trying to narrow the distance between blades, while also being limited by production costs and efficiency from separate manufacturing and welding processes, and excessive thinness compromising durability and cutting ability.

Innovation Solution

A unitary razor blade with a geometrical structure featuring a base portion, bent portion, and edge portion, where the first separation distance between the base and cutting edge is optimized between 0.3 mm to 1.0 mm, allowing for improved strength and production efficiency by forming the blade in one-piece, thus enabling a narrow span and efficient rinsability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of razor blades is increased, then shaving efficiency is improved, but drag force increases

Engineering Contradiction:

Improveshaving efficiencyVSAvoiddrag force

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The support structure is designed with thin film characteristics, reducing the overall thickness of the razor blade assembly. This allows multiple blades to be arranged in a compact configuration without significantly increasing drag force, thereby maintaining shaving efficiency while minimizing resistance during skin contact

Inventive Principle:

Principle #30Flexible shells and thin films

2Ease of operation

If the distance between razor blades is reduced, then smooth shaving is achieved, but rinsability deteriorates

Engineering Contradiction:

Improveshaving smoothnessVSAvoidrinsability

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The thin film support structure creates adequate spacing between blades even when the overall blade assembly is compact. This maintains the narrow span needed for smooth shaving while preserving sufficient gaps for water and shaving residue to flow through, ensuring good rinsability

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The first separation distance parameter is optimized to range from 0.3mm to 1.0mm, which balances the need for narrow blade spacing (for smooth shaving) with sufficient clearance (for rinsability). This precise parameter control resolves the contradiction between shaving quality and rinsing efficiency

Inventive Principle:

Principle #35Parameter changes

3Strength

If the thickness of the support is increased, then strength is improved, but the number of mountable blades is limited

Engineering Contradiction:

Improvesupport strengthVSAvoidnumber of blades

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The support is designed as a thin film structure that maintains sufficient strength through optimized geometry and material properties rather than increased thickness. This enables multiple blades to be mounted on the support without compromising structural integrity, thereby increasing the number of mountable blades

Inventive Principle:

Principle #30Flexible shells and thin films

4Ease of manufacture

If the razor blade is made thinner, then rinsability is improved, but durability and cutting ability are reduced

Engineering Contradiction:

ImproverinsabilityVSAvoiddurability and cutting ability

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The thin film support structure provides adequate mechanical strength and rigidity despite reduced thickness, enabling the razor blade to maintain durability and cutting ability. The optimized thin design simultaneously improves rinsability by reducing drag and facilitating water flow, resolving the contradiction between thinness and structural performance

Inventive Principle:

Principle #30Flexible shells and thin films

5Ease of manufacture

If separate manufacturing and welding processes are used, then blade and support can be produced independently, but production cost and complexity increase

Engineering Contradiction:

Improveindependent productionVSAvoidmanufacturing process complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The blade and support are integrated into a unitary structure formed by a single stamping process, eliminating the need for separate manufacturing and welding operations. This merging of components reduces manufacturing process complexity while maintaining production efficiency, resolving the contradiction between independent production capability and process simplicity

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20240359350A1Razor blade with bent portion

Publication Date: 2024.10.31 DORCO CO LTD

AI summary

Proposed is an integral razor blade which is thin and has improved strength by shaping a geometrical structure of the razor blade and a razor cartridge using the same. The razor blade may include a base portion, a bent portion extending in a bent manner from one end of the base portion, and an edge portion extending from one end of the bent portion, a cutting edge being formed at one end of the edge portion. A first separation distance X between a straight line extending in a longitudinal direction from a front surface of the base portion and an end point of the cutting edge may range from 0.3 mm to 1.0 mm.