Razor Blade Aperture Offset for Complete Shaving Coverage
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Solution Overview
Problem
Razors with apertures on a broad surface blade often miss hairs due to small gaps between effective shaving zones, leading to incomplete shaving as the bell curve distribution of cutting effectiveness does not fully overlap, resulting in missed hairs.
Innovation Solution
The razor features a metallic foil sheet with apertures arranged in an offset array or angled orientation relative to the handle, or utilizes a powered circular scrubbing motion to eliminate or minimize gaps between effective shaving zones, ensuring overlapping cutting edges and reducing missed hairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If apertures are arranged in a regular array on the blade, then manufacturing is simplified and blade structure is regular, but gaps between effective shaving zones cause hairs to be missed
Solution Approach 1:
The patent applies asymmetry by offsetting the arrangement of apertures in adjacent rows, creating an asymmetric pattern rather than a regular grid. This offset arrangement causes the effective shaving zones to overlap, eliminating gaps and ensuring complete hair coverage while maintaining manufacturing feasibility through a systematic offset pattern.
Solution Approach 2:
The patent introduces a dimensional change by arranging apertures in an offset pattern across multiple rows, effectively utilizing the two-dimensional blade surface more efficiently. The offset arrangement in the lateral dimension ensures that effective shaving zones overlap, converting a one-dimensional gap problem into a solved two-dimensional coverage pattern.
2Area of stationary object
If apertures are closely spaced to cover more area, then shaving coverage increases, but gaps between effective zones still result in missed hairs
Solution Approach 1:
By implementing an offset array where apertures in adjacent rows are laterally displaced, the effective shaving zones overlap to eliminate gaps. This asymmetric arrangement ensures complete hair coverage across the entire blade area without requiring increased aperture density.
3Ease of operation
If traditional linear blade movement is used, then操作简单ity is maintained, but gaps in effective shaving zones cause incomplete shaving
Solution Approach 1:
The offset aperture arrangement creates an asymmetric pattern that eliminates gaps in effective shaving zones. This allows the blade to maintain simple linear movement during operation while achieving complete hair coverage through the geometric arrangement of apertures rather than complex motion patterns.
Data Source
Figure 1
Figure 2~2A
Figure 3~3A
AI summary
Razor blades (20) and razors are provided. The razor blades include apertures (12) , the perimeter of each aperture forming a cutting edge. The razor blades and razors are constructed so as to minimize gaps between the effective shaving zones (14) of the apertures.