Razor Connecting Member Chamfer Design for Pivot Jamming
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Solution Overview
Problem
The pivoting mechanism in current razor cartridges often becomes jammed or compromised due to debris buildup or physical stress, leading to suboptimal performance and operational issues.
Innovation Solution
A connecting member with fingers featuring multiple chamfers, specifically a first chamfer angle of 15-45 degrees and a second chamfer angle of 45-80 degrees, providing a bearing length of 1.50mm to 2.50mm, which enhances clearance and attachment to the razor cartridge housing, allowing for improved pivot dynamics and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connecting member arms are used, then the structure is simple and easy to manufacture, but the pivot mechanism becomes jammed or compromised due to debris buildup or physical stress
Solution Approach 1:
The patent applies local quality by modifying only the critical finger regions of the connecting member arms with specific chamfer geometries, rather than redesigning the entire structure. The chamfers are strategically positioned at the interfaces where fingers contact the cartridge housing, providing enhanced debris resistance and pivot control precisely where needed, while maintaining the overall simplicity of the connecting member design
Solution Approach 2:
The chamfer structures perform preliminary action by pre-establishing controlled clearance paths and debris ejection channels before debris accumulation can cause jamming. The angled surfaces proactively guide debris away from the pivot interface during normal operation, preventing the pivot mechanism from becoming compromised in the first place
2Ease of operation
If the pivot mechanism allows blade unit movement, then the razor provides operational flexibility, but debris buildup interferes with the connecting member and housing
Solution Approach 1:
The patent converts the harmful effect of debris accumulation into a beneficial outcome by designing chamfered surfaces that actively utilize debris as a tool for self-cleaning. As debris accumulates during use, the angled chamfer surfaces guide and eject the debris away from the pivot interface, transforming what would be a harmful jamming force into a beneficial clearing mechanism that maintains operational flexibility
Solution Approach 2:
The chamfer structures introduce dynamic characteristics to the previously static finger-housing interface. The angled surfaces create variable clearance that changes during pivot motion, allowing the mechanism to adapt its debris resistance properties dynamically as the blade unit moves through its range of motion, thereby maintaining ease of operation while resisting debris interference
Data Source
Figure 1~2
Figure 3~4
Figure 4a~4b
AI summary
A connecting member (30) of a razor is shown to have a plurality of chamfers (42, 44) on at least one finger (36, 38) disposed at an end of an arm (34, 35). Desirably, both arms have two chamfers on each finger. Each chamfer is disposed having an angle to a top surface of the finger. Though any angles are contemplated in the present invention, the angle of the first chamfer is desirably smaller than the angle of the second chamfer. The bearing length of the finger and the first chamfer angle are together desirably balanced to provide an optimal clearance for the fingers into openings on either end of the back of the housing and improve the pivot operation and control for the user.