Shaving Razor Blade Retention via Obtuse Angles
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Solution Overview
Problem
Wet shaving razors with unitary blade members or welded blade assemblies often experience blade movement during shaving strokes, leading to inefficiency and increased nicks and cuts due to inadequate retention within the housing.
Innovation Solution
A shaving razor cartridge design featuring a housing with blade retention members forming obtuse included angles and specific contact lengths to securely position and support blade members, minimizing movement during shaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unitary blade members or welded blade assemblies are used, then the blade structure is simplified and manufacturing is easier, but the blade moves during shaving strokes leading to inefficiency and nicks
Solution Approach 1:
The blade retention system is segmented into multiple retention members distributed across the housing, each independently securing the blade at different locations. This segmentation allows the blade to be firmly held without requiring a complex monolithic retention structure, resolving the contradiction between manufacturing simplicity and blade stability.
Solution Approach 2:
The blade retention members are nested within the housing structure, with each retention member positioned to contact the blade at specific zones. This nested arrangement allows compact integration of multiple retention functions within the housing, maintaining manufacturing simplicity while ensuring blade stability through multi-point contact.
2Stability of the object's composition
If the blade retention members are positioned closer together, then blade support is improved, but the housing structure becomes more complex
Solution Approach 1:
Each blade retention member is designed to perform multiple functions: securing the blade laterally, preventing rotation, and providing support during shaving strokes. This multi-functionality allows the use of fewer retention members with greater spacing, reducing housing complexity while maintaining blade stability through efficient use of each retention element.
3Reliability
If the blade retention members have increased contact length with the blade, then blade security is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The blade retention members provide concentrated local contact at specific zones along the blade rather than distributed contact across the entire blade surface. This local quality approach ensures secure retention at critical points while allowing greater tolerance in non-critical areas, reducing overall manufacturing precision requirements while maintaining blade security.
Data Source
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AI summary
A shaving razor cartridge with a housing having a blade platform. A first blade retention member is positioned on the blade platform and has a front wall formed by a first wall and a second wall that define an obtuse included angle. A second blade retention member is positioned on the blade platform and has a rear wall facing the front wall of the first blade retention member. The rear wall has a first wall and a second wall that define an obtuse included angle. A blade member is positioned between the front wall and the rear wall. The second walls have a contact length of about 0.2mm to about 1.0mm.