Elastomeric Guard with Debris Passages for Shaving
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Solution Overview
Problem
Safety razor cartridges with larger guard contact areas often experience accumulation of shave prep and debris, which can reduce skin stretch and lead to hydroplaning, compromising the closeness of the shave.
Innovation Solution
Incorporation of an elastomeric member with passages and channels that direct shave prep and debris away from the skin, combined with flexible fins that conform to the skin and enhance skin stretch, reducing hydroplaning and improving shave closeness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the guard contact area is increased to enhance skin stretching and hair preparation, then skin stretch and shave prep accumulation increase, but shave prep and debris accumulate between the guard and skin, restricting frictional engagement and causing hydroplaning, which reduces closeness of shave
Solution Approach 1:
The guard surface is segmented into multiple discrete skin stretching elements (fins, ribs, fingers) rather than a continuous surface. This segmentation allows shave prep and debris to pass through the spaces between elements, preventing accumulation while maintaining skin stretching functionality. The segmented structure resolves the contradiction by enabling both large effective contact area for skin stretch and adequate clearance for debris removal.
Solution Approach 2:
The guard incorporates a porous or perforated structure with channels and openings that allow shave prep and debris to pass through. This porous design prevents the accumulation problem while maintaining sufficient skin contact area for stretching. The porous structure enables simultaneous achievement of skin stretch enhancement and debris evacuation, resolving the technical contradiction.
2Area of moving object
If the guard contact area is increased to provide greater skin stretching, then skin stretch improves, but hydroplaning increases due to accumulation of shave prep, lifting the cartridge blades away from the skin
Solution Approach 1:
The design extracts or removes the harmful accumulation of shave prep and debris from the interface between the guard and skin by providing escape pathways through channels and openings in the guard structure. This extraction of the harmful factor (accumulated shave prep) prevents hydroplaning while maintaining the beneficial large contact area for skin stretching.
Solution Approach 2:
The solution adds a third dimension to debris management by creating channels that extend through the thickness of the guard, allowing shave prep and debris to be evacuated in the depth direction rather than just laterally. This dimensional approach enables effective debris removal while maintaining large surface area contact for skin stretch, preventing hydroplaning.
3Area of moving object
If the guard contact area is increased to enhance hair preparation, then hair preparation improves, but frictional engagement of the guard with the skin is restricted due to accumulation, lessening skin stretch
Solution Approach 1:
The guard surface is divided into multiple discrete skin stretching elements with spaces between them. This segmentation maintains large effective contact area for skin stretch and hair preparation while allowing shave prep and debris to pass through the gaps, preventing accumulation that would restrict frictional engagement. The segmented design simultaneously achieves both goals.
Solution Approach 2:
The guard incorporates flexible elastomeric elements that can dynamically adapt to skin contours and maintain frictional engagement. The flexible material allows the skin stretching elements to conform to the skin surface, ensuring consistent frictional engagement and skin stretch even during movement, while the open structure prevents accumulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The elastomeric member effectively directs shave debris away from the skin, maintaining skin stretch and reducing hydroplaning, resulting in a closer and more efficient shaving experience.
Implementation Method 1
The guard has an elastomeric member forming at least one passage extending between an upper surface and a lower surface of the elastomeric member
Implementation Method 2
The elastomeric member has a leading portion extending beyond a leading edge of the plastic housing front portion and a following portion supported by the plastic housing front portion
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
A shaving blade unit has a plastic housing having a front portion and a rear portion' and two side surfaces extending from the front portion to the rear portion. A shaving blade is disposed between the front portion and the rear portion and has a blade length extending along a blade axis. A guard (22) is disposed at the front portion of the housing. The guard includes an elastomeric member (100) forming at least one passage extending between an upper surface (132) and a lower surface (134) of the elastomeric member.