Shaving Cartridge Retainer Segmentation for Blade Exposure Stability
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Solution Overview
Problem
Conventional shaving razor cartridges face issues with unstable blade exposure due to buckling of clip retaining elements during manufacturing, requiring additional labor and steps to secure the clips properly, and involve a multi-step process with third-party vendors, leading to variable retaining forces and increased costs.
Innovation Solution
The shaving cartridge employs preloaded, substantially c-shaped retainers with a planar top portion and curved bottom portion, featuring a protrusion and recess design that secures the retainer to the housing, providing a consistent and stable blade exposure without the need for additional bending steps, thus simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional clips are used to retain blades, then the manufacturing process can be simplified, but the blade exposure becomes unstable due to buckling of the clips
Solution Approach 1:
The retainer is divided into multiple legs (typically three) that are distributed along the length of the housing, rather than using a single continuous clip. This segmentation allows each leg to independently maintain consistent retaining force without buckling, as the force is distributed across multiple discrete attachment points.
Solution Approach 2:
The retainers are positioned at specific locations along the housing (front, middle, and rear sections) to provide localized retaining force where needed. This ensures consistent blade exposure at critical positions while maintaining overall structural integrity throughout the cartridge assembly.
2Device complexity
If conventional clips are used, then fewer components are needed, but additional labor and steps are required to ensure proper bending and securing of clip legs
Solution Approach 1:
The retainer legs are pre-formed with the correct geometry and bending characteristics during manufacturing. This preliminary action ensures that when the retainers are installed, they automatically assume their proper secured position without requiring additional bending steps or labor during assembly, eliminating the need for post-assembly adjustments.
3Device complexity
If conventional clips secured only at front and rear ends are used, then the structure is simpler, but the retaining force becomes variable throughout the length of the clips
Solution Approach 1:
The retaining system is segmented into multiple discrete legs positioned at different locations along the housing length. This segmentation transforms the variable retaining force of a single continuous clip into consistent, distributed retaining forces at multiple points, ensuring uniform blade exposure throughout the entire cartridge assembly.
Data Source
AI summary
A shaving cartridge includes a housing having a top surface, a bottom surface, a front edge, a rear edge, and a pair of side edges extending between the front edge and the rear edge. The housing includes at least one blade having a cutting edge and being disposed between the front edge and the rear edge, and a pair of retainers each having a top portion, a bottom portion, and a portion connecting the top portion to the bottom portion. The retainers extend along the pair of side edges between the front edge of the housing and the rear edge of the housing.