Rotary Shaver Inner Blade Assembly Component Reduction
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Solution Overview
Problem
The complexity and increased cost of manufacturing rotary electric shavers due to the large number of components in existing designs, which complicates the structure and processing methods, leading to higher component and manufacturing costs.
Innovation Solution
A rotary electric shaver configuration with a reduced number of components, featuring an inner blade assembly composed of three main parts: an inner blade, a movable inner blade, and an inner blade base, where the small blades are arranged in multiple rows and are vertically movable, allowing for deeper shaving with a dual track structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rotary electric shaver uses a conventional inner blade assembly with multiple separate components (cutting members, hair pulling members, coupling members, cover plates), then the shaving function is achieved, but the number of components increases, processing steps become complicated, and manufacturing cost increases
Solution Approach 1:
The patent combines the inner blade, movable inner blade, and coupling member into a single integrated inner blade assembly. This merging of previously separate components reduces the total number of parts, simplifies the structure, and lowers manufacturing complexity while maintaining the shaving and hair-pulling functions
Solution Approach 2:
The integrated inner blade assembly serves multiple functions simultaneously: the inner blade performs cutting, the movable inner blade performs hair pulling, and the coupling member provides structural support and connection. This multi-functionality is achieved within a single assembled unit rather than requiring separate dedicated components for each function
2Device complexity
If a rotary electric shaver uses a conventional inner blade assembly with multiple separate components, then the shaving function is achieved, but the structure becomes complicated and processing steps increase
Solution Approach 1:
The patent merges the inner blade, movable inner blade, and coupling member into one integrated assembly, thereby simplifying the overall structure. This reduction in structural complexity directly decreases the number of assembly steps and processing operations required during manufacturing
3Ease of operation
If a rotary electric shaver has small blades in multiple tracks, then deep shaving capability is improved, but the number of components and assembly complexity increase
Solution Approach 1:
The patent integrates multiple small blades arranged in different tracks (dual track configuration) within a single inner blade assembly. This allows the shaver to achieve deep shaving capability through multiple blade tracks while maintaining a simplified component structure, as all blades are part of one integrated unit rather than separate assemblies
Data Source
Figure 1
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Figure 3~4
AI summary
A rotary electric shaver (1) includes an outer blade (22) whose upper surface (22a) functions as annular shaving surfaces having multiple hair inlets (23) formed therein, and an inner blade (40) that has a small blade (42) which rotates while coming into sliding contact with a lower surface (22b) of the outer blade (22). The small blade (42) is formed so that an inner blade base plate (41) is partially erected, and is disposed in at least two rows on a circumference close to an outer periphery and on a circumference close to an inner periphery. There is provided a movable inner blade (50) that has a movable small blade (52) which is vertically movable along a front end surface (42b) in a rotation direction of the small blade (42), with respect to the predetermined small blade (42).