Asymmetric Shaving Blade Geometry for Skin Safety and Cutting Efficiency
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Solution Overview
Problem
Conventional shaving devices face challenges in achieving a balance between high cutting efficiency and skin safety, as small tip radii and large blade mounting angles lead to increased pressure on the skin, causing discomfort and potential skin cuts, while reducing the effective cutting angle compromises hair cutting performance.
Innovation Solution
An asymmetric cutting blade with a primary and secondary bevel, where the clearance angle is minimized to ensure skin safety and the effective cutting angle is maximized, utilizing a tertiary bevel for mechanical stabilization and reduced cutting force, and a nano-crystalline diamond coating for enhanced durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a small tip radius and large blade mounting angle are used, then cutting efficiency is improved, but pressure on the skin increases causing discomfort and potential skin cuts
Solution Approach 1:
The cutting blade is designed with an asymmetric cross-sectional shape featuring a primary bevel with a first wedge angle and a secondary bevel with a second wedge angle. This asymmetric geometry allows the blade to achieve both a large effective cutting angle for high cutting efficiency and a small clearance angle for reduced skin pressure, resolving the contradiction between productivity and harmful effects on the skin.
Solution Approach 2:
Different portions of the blade are designed with different properties: the primary bevel region provides the cutting function with optimized wedge angle, while the secondary bevel region provides mechanical stabilization and controls the clearance angle. This local differentiation allows simultaneous optimization of cutting efficiency and skin safety.
2Object-affected harmful factors
If the effective cutting angle is reduced to improve skin safety, then pressure on the skin is reduced, but hair cutting performance is compromised
Solution Approach 1:
The asymmetric blade geometry with distinct primary and secondary bevels enables independent optimization of the effective cutting angle and clearance angle. The primary bevel can be designed with a large wedge angle for high cutting efficiency, while the secondary bevel ensures a small clearance angle for skin safety, allowing both parameters to be optimized simultaneously rather than traded off.
Solution Approach 2:
The blade is segmented into functionally distinct regions: the primary bevel region responsible for cutting performance and the secondary bevel region responsible for mechanical stabilization and clearance angle control. This segmentation allows each region to be optimized for its specific function without compromising the other.
3Object-affected harmful factors
If the bevel angle is increased to maintain cutting angle while reducing clearance angle, then skin safety is improved, but cutting force increases and shaving comfort decreases
Solution Approach 1:
The asymmetric cross-sectional design with primary and secondary bevels allows the blade to achieve a small clearance angle for skin safety while maintaining a large effective cutting angle for low cutting force. The specific wedge angles of the primary and secondary bevels are optimized to ensure the blade cuts hair easily without requiring excessive force, thus improving both skin safety and shaving comfort simultaneously.
Solution Approach 2:
The blade geometry parameters (wedge angles of primary and secondary bevels) are specifically optimized to achieve the desired balance between clearance angle and effective cutting angle. By carefully selecting these parameters, the blade maintains skin safety while preserving cutting efficiency and comfort.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4a~4b
AI summary
The present invention relates to a shaving device (100) for shaving a skin surface comprising a housing (200) with a skin contacting surface (250) and at least one cutting blade (1) mounted in the housing, wherein the at least one cutting blade has an asymmetric cross-sectional shape with a first face (2), a second face (3) opposed to the first face as well as a cutting edge (4) at the intersection of the first face and the second face.