Reciprocating Shaver Blade Movable Support Mechanism
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Solution Overview
Problem
Existing hair cutting units in reciprocating electric shavers suffer from reduced hair cutting efficiency due to deformation of the external blade and displacement of the internal blade under uneven skin pressure, resulting in a smaller common contact surface.
Innovation Solution
The hair cutting unit incorporates an external blade with a curved wall and long walls that can move along a support passing through holes in the blade, and a retainer with non-parallel retaining walls and bosses to maintain the common contact surface under non-uniform pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the external blade is fixed on the retainer by welding or riveting, then the external blade is securely attached, but the external blade deforms under uneven skin pressure and the common contact surface area decreases
Solution Approach 1:
The patent applies the dynamics principle by making the external blade movable relative to the retainer through a support mechanism with a following hole. The external blade can move along the support in the longitudinal direction, allowing it to dynamically adjust its position under skin pressure rather than being rigidly fixed. This dynamic capability prevents deformation and maintains the common contact surface area between the internal and external blades during shaving operations.
2Ease of operation
If the internal blade maintains a large gap with the retainer, then the internal blade can move freely, but the internal blade undergoes significant tilt and displacement under non-uniform pressure
Solution Approach 1:
The patent applies the intermediary principle by introducing a support mechanism as a mediator between the internal blade and the retainer. The support includes a following hole that guides the external blade's movement and provides structural guidance. This intermediary structure allows the internal blade to move freely for cutting operation while simultaneously constraining excessive tilt and displacement under non-uniform skin pressure, maintaining both freedom of operation and positional stability.
3Adaptability or versatility
If the external blade is made extremely thin, then the external blade can be flexible, but the external blade deforms easily under skin pressure
Solution Approach 1:
The patent applies the parameter changes principle by modifying the structural parameters of the external blade assembly. Instead of simply making the blade thinner for flexibility, the patent introduces a support mechanism with a following hole and allows longitudinal movement. This changes the system from a static thin blade to a dynamic assembly where the thin external blade can move along the support, maintaining flexibility for conforming to skin contours while preventing deformation through the guided movement mechanism.
Data Source
AI summary
A hair cutting unit of reciprocating electric shaver includes an external blade, an internal blade, a support, and a retainer, and the external blade includes a curved wall and two mutually opposite long walls; the support holds the internal blade; the retainer has two mutually opposite retaining walls, wherein the long wall of the external blade is provided with a following hole through which at least one support passes, and the long wall of external blade can move along the support that passes through the following hole. The advantage of the hair cutting unit is that when the cutting unit is subjected to non-uniform pressure from the skin, the curved wall of external blade can continue to wrap around the internal blade without deformation, along with the moving long wall of the external blade, thus maintaining high hair cutting efficiency in actual use.