Razor Support with Rounded Extremities for Burr-Free Blade Fixation

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Solution Overview

Problem

Existing razor cartridges face challenges in performance improvement, particularly in feel and safety, due to burrs on support structures from cutting operations, which affect blade fixation and assembly precision.

Innovation Solution

A method involving a strip of material with rounded extremities, bent about a bending axis, and a razor blade fixed onto one portion, eliminating burrs and reducing joint welds, thereby enhancing blade fixation and assembly efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cutting operations are used to manufacture support structures, then manufacturing efficiency is improved, but burrs are generated on the extremities affecting blade fixation precision

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidblade fixation precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The support structure is pre-formed with rounded extremities before blade fixation operations. This preliminary shaping eliminates burrs that would otherwise interfere with precise blade positioning and fixation, allowing cutting operations to maintain high efficiency while ensuring precision in the subsequent blade attachment step

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of attempting to remove burrs as a separate corrective step, the manufacturing process converts the harmful burr formation into a benefit by designing the support with rounded extremities from the outset. This design choice transforms what would be a defect into a feature that facilitates better blade fixation and reduces interference during assembly

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Strength

If traditional rectangular cross-section coils are used, then structural strength is maintained, but the number of joint welds increases causing manufacturing downtime

Engineering Contradiction:

Improvestructural strengthVSAvoidmanufacturing downtime

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The support structure is designed as a flattened wire coil that is segmented into multiple sections along its length. Each section can be formed and positioned independently, reducing the need for joint welds between sections and thereby minimizing manufacturing downtime while maintaining overall structural integrity through the coil's continuous geometry

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support transitions from a rectangular cross-section to a rounded, flattened wire coil configuration. This curvilinear geometry reduces stress concentration points and allows for smoother forming operations, while the continuous curved structure requires fewer joints and welds compared to angular, segmented rectangular sections

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP2419247B1Method of manufacturing a razor head component, support obtained thereby and razor cartridge and razor comprising said support

Publication Date: 2020.05.27 BIC VIOLEX SA

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AI summary

Razor cartridge comprising a housing (110) at least one support (134), received by said housing, and having parallel first (48) and second (49) faces, said support comprising a lower portion (135), an upper portion (139), and a bent portion (136) intermediate the lower and upper portions, a razor blade (125) comprising a cutting edge (126) and a fixation portion (128) fixed on the second face of the upper portion of the support, wherein the support has rounded extremities (47, 46).