Intimate Trimmer Cutter Head With Obtuse Tooth Tips for Skin Protection
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Solution Overview
Problem
Existing hair cutters, particularly those used in sensitive skin areas like intimate regions, face challenges in efficiently cutting hair without causing skin irritations or injuries due to the risk of skin wrapping around sharp rake-like cutting elements, especially when the upper blade is movable, leading to inefficiencies and potential injuries.
Innovation Solution
The design features upper movable cutter blades with beveled, obtuse tooth tips and a recessed contour to prevent skin from getting caught, combined with a protective comb attachment to ensure safe and efficient hair cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the upper cutter blade is made movable to improve cutting efficiency, then cutting performance is improved, but the risk of skin wrapping around tooth tips and causing injuries increases
Solution Approach 1:
The patent inverts the conventional cutter configuration by making the upper blade movable instead of the lower blade, and by positioning the stationary blade closer to the skin. This inversion, combined with the obtuse tooth tip angle, prevents skin wrapping while maintaining cutting efficiency through the movable upper blade's scissor-like action.
Solution Approach 2:
The patent changes the geometric parameter of the tooth tips to have an obtuse angle (greater than 90 degrees) instead of the conventional acute angle. This parameter change fundamentally alters the interaction between the cutter and skin, preventing skin from wrapping around the tooth tips while still allowing effective hair cutting.
2Manufacturing precision
If the cutter elements are positioned close to the skin to cut long hairs short, then cutting precision is improved, but the risk of skin irritations and micro-injuries increases
Solution Approach 1:
The patent changes the tooth tip geometry to an obtuse angle, which fundamentally alters how the cutter interacts with skin at close distances. This parameter change allows the cutter to be positioned close to the skin for precise cutting while the obtuse angle prevents skin from wrapping around the teeth, eliminating micro-injuries.
3Object-affected harmful factors
If the lower cutter blade is made stationary to protect skin, then skin safety is improved, but cutting efficiency decreases
Solution Approach 1:
The patent inverts the conventional configuration by making the upper blade movable and stationary closer to the skin. This allows the stationary blade to provide skin protection while the movable upper blade performs the cutting action through scissor-like engagement, maintaining high cutting efficiency.
Solution Approach 2:
The patent applies different functional qualities to different parts of the cutter system: the stationary lower blade provides skin protection and guidance, while the movable upper blade provides cutting action. This local differentiation of functions allows both safety and efficiency to coexist.
Data Source
AI summary
The present invention relates to a cutter head for an intimate trimmer, comprising a pair of cooperating cutter blades each having at least one row of comb-like cutting teeth for long hair cutting, said cutter blades including a lower cutter blade and an upper cutter blade which is closer to a skin contact surface than said lower cutter blade and is movable in a cutting direction along a cutting surface defined between said cooperating cutter blades. The cutting teeth of the upper, movable cutter blade have tooth tips with obtuse tooth tip angles of more than 100° or more than 110° defined between a lower tooth side facing said cutting surface and a lower front side portion extending from said lower tooth side to a forward end point defining a maximum longitudinal tooth extension.