Razor Cartridge Segmented Support Member Design
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Solution Overview
Problem
Conventional razor cartridges face challenges in stably supporting multiple razor blades with narrow spans due to the difficulty in forming and accurately assembling corrugated protrusions on narrow blade housings, leading to instability and potential detachment during shaving.
Innovation Solution
The razor cartridge features a support member with alternating seating protrusions of different heights, facilitating stable blade support and easy assembly, where the first seating protrusion has a higher height and the second protrusion is lower, positioned closer to the rear, to securely seat and maintain razor blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corrugated protrusions are formed on a narrow blade housing to support multiple blades, then blade stability is improved, but manufacturing difficulty increases due to narrow intervals between protrusions
Solution Approach 1:
The blade housing is divided into multiple support members, each with its own seating protrusions. This segmentation allows each protrusion to be formed independently with sufficient clearance, avoiding the manufacturing difficulties of forming multiple protrusions in close proximity on a single narrow surface.
Solution Approach 2:
Instead of forming multiple protrusions in the lateral direction on a narrow surface, the patent uses multiple support members arranged in the longitudinal direction of the blade housing. This dimensional reorganization provides adequate space for each protrusion while still supporting multiple blades.
2Productivity
If the number of blades on a blade housing is increased, then shaving performance is improved, but the span between blades must be reduced
Solution Approach 1:
The blade housing is segmented into multiple support members that can independently hold blades. This allows blades to be arranged in a compact configuration with sufficient support, enabling increased blade count without requiring excessive blade span.
Solution Approach 2:
Each support member provides localized support with appropriately sized seating protrusions for the specific blade position. This local optimization allows tight blade spacing while maintaining adequate support geometry for each individual blade.
3Area of stationary object
If seating protrusions are reduced in size to accommodate narrow blade housing, then blade housing size is reduced, but support capability deteriorates
Solution Approach 1:
The seating function is segmented across multiple support members rather than concentrating all seating features on a single narrow surface. This allows each protrusion to have adequate dimensions for reliable blade support while the overall blade housing remains compact.
Solution Approach 2:
The patent rearranges the seating architecture from a two-dimensional array of protrusions on a narrow surface to a three-dimensional arrangement using multiple support members stacked or arranged along the longitudinal axis, providing sufficient protrusion size without increasing overall housing footprint.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A
AI summary
Provided is a razor cartridge 10 including at least one razor blade 5 having a cutting edge 41, a blade housing 60 configured to accommodate the at least one razor blade, a guard bar 1 disposed at a front portion 61 of the blade housing, and a cap 3 disposed at a rear portion 62 of the blade housing, wherein the blade housing includes at least one support member 70a, 70b configured to connect the front portion and the rear portion, a plurality of seating protrusions 71, 72 disposed on the at least one support member and configured to seat the at least one razor blade, and the plurality of seating protrusions include a first seating protrusion 71 having a first height h1 and a second seating protrusion 72 having a second height h2 lower than the first height, and the plurality of first seating protrusions and the plurality of second seating protrusions are aligned along a transverse direction perpendicular to a longitudinal direction, along which the cutting edge extends.