Razor Cartridge With Partitioned Blades for Longer-Beard Shaving
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Solution Overview
Problem
Existing multi-blade razors designed for daily shaving face inefficiencies when dealing with moderately hirsute surfaces, such as longer beard hair, due to clogging and increased user discomfort from closely spaced blades engaging the same hair simultaneously.
Innovation Solution
A razor cartridge with an elongated housing featuring spaced blades and guard ribs, allowing for a minimum 3.0 mm span between cutting edges, along with a partition and pivot axis positioned between the blades to prevent hair pulling and enhance comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blades are closely spaced (0.95-1.15 mm for 5-blade cartridge or 1.0-2.0 mm for 3-blade cartridge) to achieve close shave, then shaving closeness is improved, but cut hairs and debris clog spaces between blades resulting in loss of efficiency
Solution Approach 1:
The cartridge is divided into multiple blade mounting regions separated by partitioning elements. Each region contains a specific number of blades (one region has one blade, another region has two blades), creating distinct spacing zones that prevent clogging while maintaining close shave capability through the partitioned structure.
Solution Approach 2:
Different regions of the cartridge have different blade densities and spacing characteristics. The partitioning elements create localized areas with specific blade configurations optimized for their respective functions, allowing some regions to handle longer hairs while other regions provide close shave for shorter stubble.
2Measurement precision
If blades are closely spaced to achieve close shave, then shaving closeness is improved, but longer beard hairs lay on skin surface and engage same hair simultaneously causing increased hair pulling and user discomfort
Solution Approach 1:
The blade array is segmented into multiple regions with different spacing characteristics. The partitioning elements create zones where blades are spaced to handle longer hairs that lay on the skin surface, preventing multiple blades from engaging the same hair simultaneously and reducing hair pulling and user discomfort.
3Object-affected harmful factors
If multiple devices are used to cut longer beard hair in multiple stages, then user discomfort is reduced, but device complexity and time consumption increase
Solution Approach 1:
Multiple blade mounting regions with different blade configurations are combined into a single cartridge unit. This integrated design allows the user to perform all shaving stages (long hair cutting, medium hair trimming, and close shave) with one device, eliminating the need for multiple separate razors and reducing overall complexity while maintaining comfort.
Solution Approach 2:
The cartridge is designed with universal functionality to handle various hair lengths and shaving requirements within a single unit. The multiple blade mounting regions enable the cartridge to perform multiple shaving stages sequentially, making it a versatile device that replaces several specialized razors.
Data Source
AI summary
A razor cartridge has an elongated housing with a guard having spaced-apart ribs; a cap at a respective front and rear region of the housing; and a partition extending between and integrally formed with opposed lateral side walls of the housing. A first razor blade is mounted in a first blade mounting region between the guard and the partition. A second razor blade adjacent the partition, and a third razor blade are mounted in a second blade mounting region between the partition and the cap. A first span between the cutting edge of the first razor blade and the cutting edge of the second razor blade is at least 3.0 mm up to 5.12 mm. Pivotal connecting structure of the housing defines a pivot axis in a region between the cutting edges of the first and second razor blades.