Dry Shaver Lower Blade Assembly with Adaptive Spring Pretension
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Solution Overview
Problem
Existing dry shaver lower blade assemblies are complex, with a large number of functional parts that increase friction, drive power requirements, and reduce shaving comfort due to skin irritation and the complexity of implementing skin protection and hair pulling mechanisms.
Innovation Solution
A lower blade assembly with only two functional parts, where the first and second lower blades alternate their functions with movement direction, reducing the number of components and incorporating adaptive spring pretension to provide skin protection and hair separation, thereby simplifying assembly and production while maintaining shaving effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lower blade with a sharpened cutting edge is used to cut hair effectively, then shaving performance is improved, but skin irritations increase when skin sections protrude into the cutting plane
Solution Approach 1:
The leading lower blade performs a preliminary action by pushing back skin sections before they can enter the cutting plane, preventing skin irritation before it occurs. This preliminary protective action is taken in the movement direction ahead of the cutting edge.
Solution Approach 2:
The lower blade is segmented into two distinct functional parts: a leading blade with a rounded-off edge for skin protection and pushing back, and a trailing blade with a sharpened cutting edge for hair cutting. This segmentation allows each part to specialize in its function without compromise.
2Object-affected harmful factors
If protector elements or pulling elements are added upstream of the lower blade to protect skin and pull hair, then skin protection and shaving quality are improved, but the number of functional parts increases significantly
Solution Approach 1:
The protective function and cutting function are merged into a single lower blade component by integrating a leading protective edge and a trailing cutting edge into one piece. This eliminates the need for separate protector elements and pulling elements, reducing the total number of functional parts while maintaining all necessary functions.
Solution Approach 2:
The lower blade is designed as a multi-functional element that simultaneously performs skin protection (via the leading rounded edge), hair pulling (via the leading edge in movement direction), and hair cutting (via the trailing sharpened edge). This universal design consolidates multiple functions into one component.
3Productivity
If multiple functional parts are arranged in the lower blade assembly to provide skin protection and hair pulling functions, then shaving quality is improved, but friction increases and drive power requirements increase
Solution Approach 1:
By merging the protective function and cutting function into a single lower blade component, the total surface area in contact with the upper blade is reduced, thereby decreasing friction and the drive power required to operate the shaver.
Solution Approach 2:
The multi-functional lower blade performs multiple tasks (skin protection, hair pulling, hair cutting) with a single component, eliminating the need for multiple separate parts that would each contribute to friction and energy consumption.
4Ease of manufacture
If the lower blade assembly is simplified to reduce the number of components, then assembly complexity and production costs are reduced, but skin protection and hair pulling functions may be compromised
Solution Approach 1:
The lower blade is designed as a universal component that integrates skin protection (rounded leading edge), hair pulling, and hair cutting functions into one piece, ensuring that simplification does not compromise protective or functional performance.
Solution Approach 2:
Different regions of the lower blade have different local qualities: the leading edge has a rounded-off profile for skin protection and pushing back, while the trailing edge has a sharpened cutting edge for hair cutting. This local differentiation ensures each function is optimized without requiring separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces assembly complexity and production costs while enhancing shaving comfort and performance by adapting the lower blades' functions to movement direction, ensuring effective hair cutting and skin protection with fewer components.
Implementation Method 1
At least one spring element is provided for supporting the at least one lower blade with respect to the upper blade in a pretensioned manner in the movement direction
Data Source
Figure 1~2
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AI summary
The invention relates to a lower blade assembly for a dry shaver as well as to a dry shaver, which has an upper blade (5) equipped with openings and a motor for driving the upper blade and the lower blade assembly so as to oscillate with respect to one another, wherein the lower blade assembly has at least a first (10, 20; 30, 40) and a second (20, 10; 40, 30) lower blade, wherein the one blade (20, 10; 40, 30), which trails a blade that is leading (10, 20; 30, 40) in the movement direction, is provided for separating a hair protruding into the opening of the upper blade.