Hair Removal Head Tooth Structure for Flat-Lying Hair and Skin Protection
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Solution Overview
Problem
Existing hair removal devices struggle to effectively lift and cut flat-lying hair while minimizing skin irritation.
Innovation Solution
A hair removal device with a unique tooth design featuring skin support surfaces and tooth tips that do not project beyond a certain line, combined with a comb-like structure and varying cutting units, enhances hair lifting capability and reduces skin irritation by minimizing tooth entry into the hair canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tooth tips are extended beyond the skin support surfaces to improve hair cutting capability, then hair cutting effectiveness is improved, but skin irritation increases due to tooth tips entering the hair canal
Solution Approach 1:
The outer blade is designed with differentiated zones: tooth tips with limited projection height (≤1mm) to prevent skin irritation, and skin support surfaces extending beyond the tooth tips to provide skin stabilization. This local differentiation allows the cutting zone to maintain effectiveness while the support zone prevents harmful tooth-skin contact.
Solution Approach 2:
The skin support surfaces act as an intermediary element between the tooth tips and the skin. By extending these support surfaces beyond the tooth tip projection, they serve as a protective mediator that stabilizes the skin and prevents direct contact between tooth tips and the hair canal, thereby eliminating skin irritation while preserving cutting capability.
2Object-affected harmful factors
If tooth tips are shortened to avoid skin irritation, then skin irritation is reduced, but hair lifting capability for flat-lying hair deteriorates
Solution Approach 1:
The outer blade features teeth with optimized local properties: tooth tips with controlled projection (≤1mm) to prevent skin irritation, while maintaining sufficient length to engage and lift flat-lying hair. The skin support surfaces extend beyond the tooth tips to provide additional skin stabilization, ensuring both hair lifting effectiveness and skin protection.
3Object-affected harmful factors
If multiple skin support surfaces are added to improve skin protection, then skin irritation is reduced, but device complexity increases
Solution Approach 1:
The skin support surfaces are merged with the outer blade structure itself, forming an integrated design where the support surfaces and cutting teeth are part of a single monolithic component. This eliminates the need for separate protective elements, reducing device complexity while maintaining comprehensive skin protection through the extended support surfaces.
Data Source
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AI summary
The present invention relates to a hair removal device, in particular a hair trimmer or a shaver or a hair trimmer portion of a shaver, comprising a handle 60 with a motor 80 and a hair removal head 40, said hair removal head being provided with at least a first hair cutting unit 20 with an outer blade 21 and an inner blade 22, said inner blade being reciprocally moveable along a first axis 30 relative to the outer blade, wherein said outer blade comprises a row of teeth 23, 24 cooperating with said inner blade for cutting hair. At an outer border first and second skin support surfaces 4a, 4b are provided. The skin sides of tooth tips 3 are provided below or on same level as at least one of said first and second skin support surface in a direction towards said handle or said skin sides of said tooth tips are configured such to not cross or extend beyond a connecting line parallel to a second axis 31 between said first and second skin support surfaces.