Stacked Tapered Tooth Stationary Blade for Hair Cutting Appliances
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Solution Overview
Problem
Conventional hair cutting appliances with stationary blades have limited length adjustment ranges and require additional attachment combs, which are cumbersome, costly, and prone to loss, limiting their operational performance and application.
Innovation Solution
A method of forming a stationary blade with a series of tapered metal teeth arranged in a stacked configuration, allowing for increased height and length adjustment without the need for additional combs, using metal tooth components and a blade base that can be made from lower-quality material, enabling a significant expansion of the cutting length adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional stationary blades are used with slight tapering, then the blade structure is simple and manufacturing is easy, but the cutting length adjustment range is limited to less than 2.0 mm
Solution Approach 1:
The stationary blade is divided into multiple individual teeth that are stacked and interconnected to form the complete blade structure. This segmentation allows each tooth to be tapered independently, enabling a large cumulative adjustment range while keeping individual components simple and easy to manufacture.
Solution Approach 2:
The stationary blade uses a composite structure combining multiple metal tooth components with different taper degrees. These components are stacked and interconnected to create a blade that achieves both large adjustment range and structural integrity, resolving the contradiction between complexity and functionality.
2Length of moving object
If attachment combs are added to expand length adjustment range, then the adjustment range is increased, but the device complexity increases and additional parts are required
Solution Approach 1:
The length adjustment function is merged into the stationary blade itself through the stacked tapered teeth structure. This eliminates the need for separate attachment combs, as the blade's own structure provides the full adjustment range, reducing the number of accessory parts while maintaining expanded functionality.
Solution Approach 2:
The stationary blade with stacked tapered teeth serves multiple functions: it provides the cutting function and simultaneously provides the length adjustment function through its variable tooth heights. This multi-functionality replaces the need for separate attachment combs, reducing device complexity.
3Reliability
If the stationary blade is made from high-quality steel material, then the cutting performance is effective, but the manufacturing cost is high
Solution Approach 1:
The stationary blade is segmented into multiple teeth that can be manufactured separately using simpler, lower-cost processes. Only the critical cutting edges of individual teeth require high-quality steel, while the overall blade structure can use lower-quality materials, reducing total manufacturing cost while maintaining cutting performance.
Solution Approach 2:
High-quality steel material is applied locally only to the cutting edges of the tooth components where it is most needed for effective cutting. The blade base and non-cutting portions can use lower-quality materials, optimizing the balance between cutting performance and manufacturing cost.
Data Source
AI summary
A stationary blade for a hair cutting appliance and a method of forming the stationary blade includes providing tooth components obtained from metal material, where the tooth components are arranged in a substantially flat fashion and are at least partially tapered towards a tip end. The method further includes arranging the tooth components next to each other to form a series of spaced apart teeth, where neighboring tooth components are arranged at a distance from one another; providing a blade base acting as a support receptacle, arranged to receive the tooth components; and interconnecting the tooth components and the blade base in a direct or mediate fashion, thereby forming teeth of the stationary blade.