Fixed Blade Tooth Structure for Closer Hair Trimming
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Solution Overview
Problem
Existing fixed blades for hair trimming have cutting teeth that are as thick as the blade itself, leading to unsatisfactory hair trimming results due to longer residual hair roots.
Innovation Solution
A fixed blade design featuring a base sheet with a blade teeth set and a material removal groove that reduces the thickness of each cutting tooth below the base sheet thickness, along with tooth protrusions for enhanced safety and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the fixed blade is increased to ensure working strength and prevent deformation, then the blade strength is improved, but the hair trimming effectiveness deteriorates due to longer residual hair roots
Solution Approach 1:
The patent applies local quality by creating different thickness zones within the blade structure. The base sheet maintains a standard thickness (0.3mm or above) for overall strength, while material removal grooves are strategically positioned to reduce the thickness of specific cutting tooth regions. This allows the blade to have both strong structural support and thin cutting edges that effectively trim hair close to the scalp.
Solution Approach 2:
The blade is segmented into distinct functional zones through the material removal grooves, which divide the base sheet into multiple thickness regions. The grooves create separate areas: thicker regions for structural support and thinner regions for cutting teeth, allowing each segment to perform its specific function optimally without compromising the other.
2Productivity
If the thickness of cutting teeth is reduced to improve hair trimming effectiveness, then the trimming quality is improved, but the blade working strength deteriorates due to increased deformation risk
Solution Approach 1:
The patent reduces cutting tooth thickness locally through material removal grooves while maintaining the base sheet's overall thickness for strength. The grooves are positioned specifically at the cutting tooth regions, creating thin edges (smaller than base sheet thickness) that effectively trim hair, while the rest of the base sheet remains thick enough to prevent deformation during use.
Solution Approach 2:
The patent solves the strength-thickness contradiction by transitioning to a multi-dimensional structure. Instead of uniformly reducing thickness, the material removal grooves create a three-dimensional thickness variation within the blade, with cutting teeth having reduced thickness in the cutting direction while maintaining adequate thickness in structural support regions.
Data Source
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AI summary
A fixed blade, comprising a base plate (1). A blade tooth group (2) consisting of a plurality of cutting teeth (21) is provided at the edge of at least one side of the base plate. A hollowed-out groove (3) is provided in the upper end face and/or the lower end face of the base plate, such that the thickness (T3) of each cutting tooth in the blade tooth group is less than the thickness (T2) of the base plate, and a tooth protrusion (4) is formed at the upper end face and/or the lower end face of the tooth tip of each cutting tooth in the blade tooth group. Also provided is a manufacturing method for the fixed blade. The upper end face and/or the lower end face of the base plate is provided with a hollowed-out groove and the hollowed-out groove is used to reduce the thickness of the cutting teeth so as to improve the hair trimming effect. Moreover, the hollowed-out groove also enables tooth protrusions to be formed at the upper end face and/or the lower end face of the tooth tips of the cutting teeth; the tooth protrusions can be used for protecting the skin and preventing the tooth tips of the cutting teeth being too sharp and scratching the skin, thus improving the safety of using the fixed blade; the tooth protrusions can also serve as a comb to stimulate skin nerves and to accelerate skin blood circulation and blood oxygen supply, thus making the skin feel comfortable, and improving the comfort of using the fixed blade.