Razor Blade Cartridge Reinforcement for Rigidity
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Solution Overview
Problem
The rigidity of the blade supporting portion in razors is often too low, leading to deformation under pressing force and heat during welding, which affects shaving comfort by altering the relative positions of the blades.
Innovation Solution
Incorporating reinforcement portions bent from the blade mounting portions and arranged between the blade mounting portions and the blade base member to enhance the rigidity of the blade supporting portion, allowing for stable blade mounting and easy formation without interfering with razor use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the blade supporting portion is increased to improve rigidity, then the rigidity is improved, but bending of the blade supporting portion or welding of the blades to the blade mounting portions is hampered
Solution Approach 1:
The patent applies local quality by adding reinforcement portions only at specific locations (blade mounting portions) where high rigidity is needed, rather than uniformly increasing the thickness of the entire blade supporting portion. This allows the blade supporting portion to maintain adequate rigidity for blade positioning while remaining thin enough in other areas to facilitate bending and welding operations.
Solution Approach 2:
The blade supporting portion is segmented into different thickness zones: thicker reinforcement portions at the blade mounting locations and thinner portions in the bridge areas. This segmentation enables differential rigidity distribution, providing structural support where needed while maintaining manufacturability in other regions.
2Ease of manufacture
If the rigidity of the blade supporting portion is low, then bending and welding are facilitated, but the blade supporting portion deforms under pressing force or heat during welding, affecting shaving comfort
Solution Approach 1:
The reinforcement portions are strategically placed at the blade mounting portions where precision positioning is critical. This localized thickening ensures that the blade supporting portion maintains its shape and position during welding and pressing operations, while the rest of the structure remains thin and easy to manufacture.
Solution Approach 2:
Instead of uniformly increasing thickness in one dimension, the patent uses localized reinforcement portions that add dimensional variation only where needed. This approach maintains the overall thin profile of the blade supporting portion while providing localized structural support to prevent deformation during manufacturing and 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 configuration maintains shaving comfort by preventing deformation of the blade supporting portion, ensuring stable blade positioning and efficient shaving scum removal, while facilitating bending and welding processes.
Implementation Method 1
the reinforcement portion is preferably formed by being bent from the blade mounting portions
Implementation Method 2
When the blades of the blade member press the skin surface, the elastic leg portions are elastically deformed in correspondence with the pressing force applied to the blades
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A blade cartridge includes a blade member (15) provided with blades (13), a blade base member (16) located on the back side of the blade cartridge, and a top member (17) located on the front side of the blade cartridge. The blade member (15) is arranged between the blade base member (16) and the top member (17). The cutting edge (13a) of each blade (13) is exposed through the top member (17). A blade supporting portion (24) provided in the blade member (15) has a plurality of step plates (29) arranged in a blade arrangement direction (Z), which is orthogonal to the direction in which the cutting edge (13a) extends. A reinforcement plate portion (33), which increases the rigidity of the step plate (29), is provided while being bent from the step plate (29). The blade supporting portion (24) is also provided with a bridge portion (30) for mutual coupling.