Shaving Cartridge Pivot Stop Prevents Blade Breakage
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Solution Overview
Problem
Conventional shaving razors with multiple blades face issues of blade breakage due to over-rotation and difficulty in trimming operations, as existing designs lack effective load distribution and stop surfaces to prevent terminal portion damage and facilitate trimming.
Innovation Solution
A shaving cartridge design featuring a cartridge housing with pivotally connected blades and a connecting member that includes load-bearing surfaces and stop surfaces, allowing the cartridge to pivot beyond a normal angle, thereby distributing load and preventing terminal portion breakage, and incorporating a trimming blade assembly for enhanced trimming functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cartridge is designed to pivot during shaving operations, then shaving performance is improved, but the terminal portions of the connecting member are susceptible to breakage due to over-rotation
Solution Approach 1:
The patent applies beforehand cushioning by providing load-bearing surfaces on the connecting member that engage with stop surfaces on the cartridge housing before the terminal portions can break. These load-bearing surfaces are positioned to contact the housing when the cartridge pivots beyond a normal shaving angle, thereby cushioning the impact and preventing breakage of the thinner terminal portions while allowing free pivoting during normal operation
2Ease of operation
If the connecting member has thin terminal portions for pivoting, then ease of pivoting is improved, but the terminal portions become prone to breaking under load
Solution Approach 1:
The patent positions load-bearing surfaces on the connecting member body (远离 terminal portions) to engage with stop surfaces on the housing before terminal portions can break. This beforehand cushioning protects the thin terminal portions by transferring loads to stronger regions of the connecting member during over-rotation events while maintaining pivoting ease during normal use
Solution Approach 2:
The patent applies local quality by differentiating the functional properties of different parts of the connecting member: the terminal portions are designed to be thin for easy pivoting during normal operation, while the body portion contains load-bearing surfaces that provide enhanced strength and load distribution when needed during over-rotation
3Strength
If stop surfaces are added to limit rotation, then blade breakage is prevented, but trimming operation flexibility is reduced
Solution Approach 1:
The patent applies parameter changes by designing stop surfaces that limit rotation to a specific angle range suitable for both shaving and trimming operations. The stop surfaces are positioned to engage at angles that prevent excessive rotation during shaving while still allowing sufficient pivoting range for effective trimming, thus optimizing the parameter of rotation angle for multiple functions
Data Source
AI summary
A shaving cartridge includes a cartridge housing having a front edge and a rear edge. One or more shaving blades are positioned between the front and rear edges of the housing. A connecting member is pivotally connected to the cartridge housing, the connecting member having a load-bearing surface arranged and configured to contact the housing only when the housing is pivoted beyond a limit angle that is greater than the normal pivot angle.