Electric Shaver Rocking Support Arm for Blade Head Range
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Solution Overview
Problem
Conventional electric shavers face a limitation in increasing the rockable range of the blade head without enlarging the main body, which hampers enhanced skin-following capability and shaving performance.
Innovation Solution
The electric shaver features a blade head with an outer blade having multiple openings, an inner blade that reciprocates, and a support arm that rocks around an axis intersecting with the reciprocating direction of the inner blade, allowing for a wider rockable range while maintaining a compact design. The support arm's width increases from base to tip, and it is divided into sections for enhanced flexibility, with biasing mechanisms and rollers guiding the rocking motion to optimize skin contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the width of the main body block is increased to increase the rockable range of the head block, then the rockable range is improved, but the device size increases
Solution Approach 1:
The invention changes the rocking axis orientation from the conventional direction (parallel to blade width) to a direction intersecting with the reciprocating direction of the inner blade. This dimensional reorientation allows the blade head to rock in a different plane, effectively increasing the rockable range without requiring an increase in the main body block width. The support arm projects from the end of the grip portion and enables rocking motion around this newly oriented axis.
Solution Approach 2:
The support arm is designed with variable flexibility along its length, being more flexible at the tip end and stiffer at the base end. This dynamic characteristic allows the support arm to accommodate the rocking motion of the blade head while maintaining structural integrity. The progressive flexibility enables a wider rockable range without requiring a larger main body block, as the support arm itself adapts to the motion requirements.
2Adaptability or versatility
If the support arm is made more flexible to increase rockable range, then the skin-following capability is improved, but the structural stability deteriorates
Solution Approach 1:
The support arm is designed with non-uniform flexibility characteristics along its length. The tip end portion is made more flexible to allow greater rockable range and skin-following capability, while the base end portion near the grip portion is made stiffer to maintain structural stability and proper positioning. This local differentiation of mechanical properties resolves the contradiction between flexibility for motion and stiffness for stability.
Solution Approach 2:
The support arm exhibits dynamic flexibility that varies along its length, with the tip end being more compliant and the base end being more rigid. This gradient in flexibility allows the support arm to dynamically adapt to different operational requirements: it flexes sufficiently at the tip to enable wide rocking motion for skin-following, while maintaining adequate stiffness at the base for stable mounting and positioning.
Data Source
AI summary
A support arm that is rockably supported on one end of a grip portion and projects from the one end is provided. Both ends of a blade head are supported by the support arm such that the blade head can rock around an axis extending along a reciprocating direction of an inner blade, and an axial direction of the rocking motion of the support arm with respect to the grip portion is set in a direction intersecting with the reciprocating direction of the inner blade. This configuration achieves an electric shaver capable of increasing the movable range of the blade head while preventing a main body from increasing in size.