Intimate Trimmer Cutter Head With Recessed Tooth Tips
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Solution Overview
Problem
Existing hair cutters, particularly those used in sensitive skin areas, face challenges in efficiently cutting hair without causing skin irritations or injuries, especially when used without protective combs, due to the risk of skin wrapping around the rake-like cutting elements and reduced cutting efficiency with obtuse tooth tip angles.
Innovation Solution
The design features upper movable cutter blades with beveled, recessed tooth tips having obtuse angles of 100° to 140°, allowing the skin to follow an overhanging contour and preventing it from entering the cutting zone, combined with a protective attachment that guides the skin away from the cutting teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rake-like cutting elements are used to cut long hairs, then cutting efficiency for long hairs is improved, but skin irritations and injuries increase due to skin wrapping around the tooth tips
Solution Approach 1:
The patent applies local quality by differentiating the tooth tip geometry from the rest of the cutter blade. Specifically, the tooth tips are designed with obtuse angles (100°-140°) and overhanging contours that create a recessed cutting zone, while the body of the cutter blade maintains its functional cutting geometry. This localized modification at the tooth tips prevents skin wrapping without compromising the overall cutting efficiency of the rake-like elements.
2Object-affected harmful factors
If obtuse tooth tip angles are used to prevent skin wrapping, then skin protection is improved, but cutting efficiency decreases
Solution Approach 1:
The patent segments the cutter blade into distinct functional zones: the tooth body maintains sharp, functional geometry for efficient hair cutting, while the tooth tips feature obtuse angles and overhanging contours for skin protection. This segmentation allows different parts of the same component to serve different functions - the body cuts hair efficiently while the modified tips protect the skin from wrapping and injury.
3Manufacturing precision
If cutter blades are positioned close to the skin for effective cutting, then cutting precision is improved, but the risk of skin injuries increases
Solution Approach 1:
The patent introduces an intermediary protective structure through the obtuse-angled tooth tips with overhanging contours. These modified tooth tips act as a mediator between the cutting elements and the skin, creating a recessed cutting zone that allows precise cutting while preventing direct skin contact with the sharp cutting edges, thus reducing the risk of injuries.
Data Source
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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.