Razor Head Outer Frame Resilient Arm Angle Optimization
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Solution Overview
Problem
Current razor head outer frames suffer from either insufficient upward force due to a small inclination angle between the resilient arm and the first plane, leading to poor performance, or excessive deformation and potential fracture due to a large inclination angle, resulting in a short lifespan.
Innovation Solution
The outer frame design features an inclination angle of 25° to 30° between the resilient arm's leg part and the first plane, with a radius of curvature between 0.03 mm and 1.0 mm, and a unitary structure for the resilient arms and positioning blocks, ensuring a suitable supporting force and preventing fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the inclination angle between the leg part and the first plane is made small, then the downward offset distance Yp is small which results in insufficient upward force F, but if the inclination angle is made large, then the downward offset distance Yp is large which causes excessive elastic deformation and potential fractures
Solution Approach 1:
The patent applies parameter changes by optimizing the inclination angle of the resilient arm's leg part to a specific range (25°-30°). This parameter optimization resolves the contradiction by finding the optimal value that provides sufficient upward force while preventing excessive deformation. The specific angle range was determined through mathematical modeling and experimental verification to balance force generation and structural integrity.
2Force
If the inclination angle between the leg part and the first plane is increased, then the upward force F increases, but the elastic deformation becomes excessive causing fractures
Solution Approach 1:
The patent resolves this contradiction by changing the inclination angle parameter to an optimized range (25°-30°). This parameter adjustment ensures that the resilient arm generates adequate upward force to support the razor blade assemblies while remaining within safe elastic deformation limits, thereby improving reliability and preventing fractures during use.
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 enhances the razor head's performance and extends its lifespan by providing a suitable supporting force to the razor blade holder within a safe deformation range, preventing fractures and improving usability.
Implementation Method 1
the upward force F that the head part applies to the razor blade holder is a linear function of a downward displacement Y: F=K×Y, wherein K is the spring constant (depended on the length L, inertia moment I and modulus of elasticity E of the resilient arm, K=L3/(3EI))
Data Source
AI summary
An outer frame of a razor head includes two side parts, a front part and a rear part connecting the side parts. An inner side wall of each side part provides a positioning block which has a first plane for mounting and supporting razor blade assemblies. Resilient arms are connected with side walls of the positioning blocks. Each resilient arm includes a leg part connecting the positioning block and a head part connecting an end of the leg part. An inclination angle between the leg part and the first plane is in the range of 25°˜30°. The head part is extended out of the first plane. The resilient arm can provide a suitable supporting force to a razor blade holder within its allowable range to be prevented from being fractured easily, and in turn improve the using performance of the outer frame and extend its lifetime.