Razor Head Geometry to Reduce Skin Bulging During Shaving
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Solution Overview
Problem
Conventional razors cause skin bulging and irritation due to the blades pressing against and cutting the bulging skin during shaving.
Innovation Solution
A shaving system with a blade head frame design where the protective member's upper surface is higher than the supporting sidewall by 0.05-0.80 mm and the sidewall's upper surface is higher than the blade's cutting edge by 0.01-0.32 mm, reducing skin bulging and preventing cutting by maintaining a comfortable shaving experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protective member's upper surface is flush with the supporting sidewall, then the structure is simple, but skin bulging occurs causing blade irritation
Solution Approach 1:
The protective member is designed with a specific height relative to the supporting sidewall (0.05-0.80mm higher), creating a localized height difference that changes the pressure distribution characteristics. This local geometric modification allows the protective member to press down on skin from the front while the blade presses from behind, reducing skin bulging and preventing irritation without requiring complex overall structural changes
2Productivity
If the protective member presses down on skin from the front and the blade presses from behind, then hair cutting effectiveness is improved, but skin bulging increases causing irritation
Solution Approach 1:
The patent specifies precise height parameters: the protective member's upper surface is 0.05-0.80mm higher than the supporting sidewall, and the supporting sidewall's upper surface is 0.01-0.32mm higher than the blade's cutting edge. These parameter changes create an optimized pressure distribution that maintains effective hair cutting while preventing excessive skin bulging and irritation
Data Source
AI summary
A shaving system includes a blade head frame and blades. The blade head frame is provided with a front side wall located in front of the blades, the blades extend in a left-right direction of the blade head frame, and cutting edges of the blades face the front side wall of the blade head frame. The front side wall of the blade head frame is provided with a protective member, and a supporting sidewall between the protective member and the blades, an upper surface of the protective member is 0.05-0.80 mm higher than an upper surface of the supporting sidewall, and the upper surface of the supporting sidewall is 0.01-0.32 mm higher than the cutting edge of the blade adjacent to the supporting sidewall, so as to effectively reduce the skin bulging at the protective member and the blades during shaving, thereby ensuring shaving comfort.