Unitary Razor Blade Structure for Thin Yet Strong Shaving
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Solution Overview
Problem
Conventional razor blades are either too thick and prone to deformation or too thin and weak, and the manufacturing process involves costly welding, which affects shaving performance and efficiency.
Innovation Solution
A razor blade with a curved cutting edge, connection, and support portion combined into a single body, distributing cutting pressure and maintaining strength, with a thickness between 0.075 mm and 0.2 mm, and a geometrical structure that enhances durability and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the razor blade is made thin to narrow the gap between blades and improve shaving performance, then the shaving performance is improved, but the blade becomes easily deformed and durability deteriorates
Solution Approach 1:
The razor blade incorporates a curved surface extending from the cutting edge toward the rear, which distributes applied pressure along the curved geometry rather than concentrating it at single points. This curvature allows the blade to maintain structural integrity and resist deformation even when made thin, thereby improving both shaving performance and durability simultaneously
Solution Approach 2:
The blade is constructed from high-strength materials such as stainless steel or titanium alloy that provide exceptional strength-to-weight ratios. These materials enable the blade to be made thin for improved shaving performance while maintaining sufficient strength and resistance to deformation through the inherent material properties
2Ease of manufacture
If the cutting edge and supporter are manufactured separately and combined by welding, then the manufacturing process is established, but manufacturing expenses increase and manufacturing efficiency deteriorates
Solution Approach 1:
The cutting edge and supporter are integrated into a single monolithic structure formed through stamping or molding processes. This merging eliminates the need for separate manufacturing and welding operations, significantly improving manufacturing efficiency and productivity while reducing production costs and complexity
3Productivity
If the number of razor blades is increased to improve shaving efficiency and distribute pressure, then shaving efficiency is improved, but the drag force increases and the gap between blades narrows adversely affecting performance
Solution Approach 1:
The cartridge is designed to accommodate multiple thin blades arranged in sequence, with each blade contributing to the cutting action. The segmented blade structure allows pressure distribution across multiple cutting edges while maintaining optimal spacing between blades to minimize drag force and prevent adverse effects on shaving performance
Data Source
AI summary
A razor blade cartridge includes: a housing: a razor blade fixedly mounted in the housing including: an edge that is elongated in a direction orthogonal to shaving direction, the edge includes a cutting edge formed in a single arch and opposing rear and front faces, wherein the cutting edge extends along a longitudinal direction which is orthogonal to shaving direction; a connection portion extended and bent from the edge toward a direction orthogonal to the longitudinal direction and orthogonal to the shaving direction, the connection portion having faces continuous with the front and rear faces of the edge respectively; and a support portion extending from the connection portion in the direction orthogonal to both the longitudinal direction and the shaving direction, the support portion supporting the edge and the connection portion, the connection portion and the support portion are a single body.