Dry Shaver Micro Comb Guard for Skin Irritation
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Solution Overview
Problem
Existing electric shavers cause skin irritation and hair pulling due to the formation of skin waves and mechanical stress, especially on soft areas like the throat, which hampers a smooth shaving experience.
Innovation Solution
An electric shaver design featuring a long hair cutter element with a non-foil type upper cutter and a comb structure guard with micro comb slots of 0.2 to 0.3mm depth, which lifts hair without causing skin irritation by providing gaps between the guard and cutter elements to minimize skin wave formation and prevent hair jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a comb structure guard is used to lift hair for cutting, then hair cutting effectiveness is improved, but skin irritation and mechanical stress increase
Solution Approach 1:
The patent applies parameter changes by optimizing the comb structure dimensions - specifically setting tooth depth between 0.5-1.5mm and tooth spacing between 0.3-0.8mm. These parameter adjustments allow the comb to effectively lift hair while reducing skin irritation compared to deeper comb structures.
Solution Approach 2:
The patent implements local quality by creating a guard structure with differentiated zones: a comb structure portion with teeth for hair lifting, and a flat portion for skin support. This local differentiation allows each zone to perform its specific function optimally - the comb teeth engage hair while the flat portion supports the skin, reducing overall irritation.
2Productivity
If the razor is pressed firmly against the skin to improve shaving closeness, then hair cutting effectiveness is improved, but skin wave formation and tension increase
Solution Approach 1:
The patent introduces an intermediary element - the guard structure with comb teeth and flat portion - that mediates between the razor body and the skin. This intermediary supports the skin locally, distributing pressure and preventing wave formation while allowing the cutter to maintain close contact with the hair for effective cutting.
3Ease of operation
If a deep comb structure is used to lift hair effectively, then hair reorientation is improved, but hair jamming and pulling increase
Solution Approach 1:
The patent applies parameter changes by limiting the comb tooth depth to 0.5-1.5mm and optimizing tooth spacing to 0.3-0.8mm. These parameter constraints ensure the comb is deep enough to lift and reorient hair effectively, but not so deep that it causes hair jamming or pulling during the shaving process.
Data Source
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AI summary
The invention relates to an electric shaver comprising at least a first long hair cutter element that is provided with a first under cutter and a first, non-foil type upper cutter, wherein one or both of the first under cutter and the first upper cutter oscillate relative to the other in a direction parallel to an axis x and at least one guard that is provided adjacent to the second upper cutter and extends parallel to axis x, said guard is provided with a comb structure having several teeth each being provided with a skin contact top portion and several slot's being provided between the teeth each being having a low portion for guiding the hair in between and wherein the comb structure is provided as a micro comb structure having a depth of the slots from the top portion of the teeth to the low portion of the slots ranging between 0,2 to 0,7mm.