Segmented Blade Set for Shaving and Trimming
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Solution Overview
Problem
Existing electric razors are not suited for precise trimming operations due to lack of mechanisms for spacing the foil and cutter blade from the skin, while hair trimmers are not suited for shaving due to blade rigidity, leading to the need for separate appliances and complex, uncomfortable combined devices that are heavy and prone to wear.
Innovation Solution
A segmented stationary blade set with a first, second, and intermediate wall portion forming a U-shaped toothed leading edge, allowing for a thin skin-contacting blade that provides both shaving and trimming capabilities with improved stiffness and reduced manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin skin-contacting blade is used for shaving, then shaving performance is improved, but blade rigidity deteriorates causing excessive deformation
Solution Approach 1:
The blade is divided into multiple wall portions (first, second, and intermediate wall portions) that are fixedly interconnected to form a segmented stack. This segmentation allows the blade to be thin for skin contact while maintaining rigidity through the stacked structure, resolving the contradiction between thinness and strength.
Solution Approach 2:
The blade uses a composite structure with multiple wall portions stacked together, creating a multi-layered configuration that provides both the thinness needed for skin contact and the rigidity required to prevent excessive deformation during cutting operations.
2Strength
If a rigid blade structure is used for trimming, then blade strength is improved, but adaptability to skin contact deteriorates
Solution Approach 1:
The blade is segmented into multiple wall portions that can be stacked in different configurations, allowing the same basic structure to serve both trimming (requiring strength) and shaving (requiring skin contact adaptability) functions, thus resolving the contradiction between strength and adaptability.
Solution Approach 2:
The segmented blade structure is designed to be multi-functional, capable of performing both trimming operations (where rigidity is needed) and shaving operations (where thin skin contact is needed) by utilizing the same blade assembly in different operational modes, achieving universality across different hair cutting needs.
3Adaptability or versatility
If separate appliances are used for shaving and trimming, then functional specialization is improved, but device complexity deteriorates
Solution Approach 1:
The blade assembly is designed with universal functionality to perform both shaving and trimming operations using the same basic structure, eliminating the need for separate specialized appliances and thereby reducing overall device complexity while maintaining functional specialization through operational mode differentiation.
Solution Approach 2:
The blade system incorporates dynamic characteristics that allow it to adapt to different operational requirements (shaving vs. trimming) through controlled movement and positioning, enabling a single appliance to handle multiple functions without requiring complex separate mechanisms for each function.
4Adaptability or versatility
If a combined shaving and trimming device is created, then versatility is improved, but device complexity and weight increase
Solution Approach 1:
The shaving and trimming functions are merged into a single blade assembly where the same movable blade and stationary blade structure serve both purposes, combining previously separate functions into one unified system that reduces overall device complexity and weight compared to maintaining separate appliances.
Solution Approach 2:
The combined device achieves versatility through a universal blade design that can perform both shaving and trimming operations, eliminating the need for multiple specialized devices and thereby reducing the overall structural complexity and weight of the complete hair care system.
Data Source
AI summary
A hair cutting appliance includes a blade set including a first wall portion and a second wall portion, each wall portion defining a first surface, a second surface, and at least one toothed leading edge including a plurality of mutually spaced apart projections provided with respective tips, wherein the first surfaces of the first wall portion and the second wall portion face each other, at least at their leading edges, wherein facing projections along the leading edges of the first and second wall portions are mutually connected at their tips to define a plurality of teeth, wherein the first surfaces of the first wall portion and the second wall portion define therebetween a guide slot for a movable blade and wherein the second surface of the first wall portion at, includes a smoothed transitional region, at least at the forwardly extending projections.