Five-Blade Razor Cartridge Span Layout for Longer Hair Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Shaving razor cartridges designed for daily shaving have not kept up with changing consumer habits, leading to inefficiencies and discomfort when used by consumers who shave less frequently, such as men shaving their faces less often or shaving other body parts, due to trapped hairs and decreased shaving performance.
Innovation Solution
A razor cartridge design with a specific blade arrangement and geometry, including a 3:1 to 6:1 ratio of total blade spans to primary span, optimized blade angles, and reduced rinse gaps, to enhance cutting efficiency and comfort for infrequent shavers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional blade arrangement is used, then shaving performance is optimized for daily shavers, but shaving performance deteriorates for infrequent shavers due to trapped hairs
Solution Approach 1:
The patent changes the geometric parameters of the blade arrangement, specifically the ratio of total blade span to primary span (3:1 to 6:1), to optimize performance for infrequent shavers while maintaining versatility across different shaving frequencies
2Productivity
If blade span is reduced to cut longer hairs, then cutting efficiency improves for infrequent shavers, but shaving comfort deteriorates due to increased skin contact pressure
Solution Approach 1:
The patent applies different span characteristics to different blades within the cartridge. The primary blade has a different span ratio compared to secondary blades, allowing each blade to be optimized for its specific function - primary blade for cutting longer hairs, secondary blades for maintaining comfort and reducing skin irritation
Data Source
AI summary
A shaving razor cartridge with a housing a housing, a guard at a front of the housing and a cap at a rear of the housing. A first blade, a second blade, a third blade, a fourth blade and fifth blade mounted to the housing between the guard and the cap. The first blade having a primary span. The second blade having a first blade span. The third blade having a second blade span. The fourth blade having a third blade span. The fifth blade having a fourth blade span. A ratio of a sum of the primary span, the first blade span, the second blade span, the third blade span and the fourth blade span to the primary span is 3:1 to 6:1.