Razor Handle Attachment Mechanism Using Segmented Stem and Asymmetric Protrusions

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Solution Overview

Problem

Conventional razor handles lack secure attachment mechanisms to razor cartridges, leading to potential separation during handling, and do not provide optimal grip or balance.

Innovation Solution

A razor handle design featuring a cartridge engaging end with a stem and protrusions that interact with a handle body, along with a cover layer made of SEBS-based thermoplastic elastomer for enhanced grip, and a modular construction using interlocking shells for improved stability and attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional razor handles use simple attachment mechanisms, then device complexity is reduced, but attachment reliability deteriorates leading to potential separation during handling

Engineering Contradiction:

Improveattachment reliabilityVSAvoidattachment mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The attachment mechanism is segmented into multiple independent components: a stem with protrusions for insertion, a separate cover layer for securing, and interlocking shells. This segmentation allows each component to perform a specific function (insertion, locking, protection) while collectively achieving reliable attachment without excessive overall complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The attachment end is nested within the handle body, with the stem inserted into the handle body cavity and the cover layer enclosing both the stem and handle body. This nested structure provides secure attachment through multiple concentric protective and locking layers

Inventive Principle:

Principle #7Nested doll (Nesting)

2Stability of the object's composition

If conventional razor handles use simple handle structures, then manufacturing is easier, but stability deteriorates allowing rotation and separation

Engineering Contradiction:

Improvehandle stabilityVSAvoidmanufacturing ease

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The stem features asymmetric protrusions that extend away from the stem centerline at specific angles, creating a non-symmetric configuration that prevents rotation of the cartridge relative to the handle. This asymmetric geometry provides inherent anti-rotation stability while maintaining manufacturability through standard molding techniques

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The protrusions on the stem are pre-positioned during manufacturing to align with corresponding recesses in the handle body. This preliminary positioning ensures that when the cartridge is attached, the components automatically engage in the correct orientation, preventing rotation before the user even handles the razor

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If conventional razor handles lack grip enhancement features, then manufacturing simplicity is maintained, but ease of operation deteriorates

Engineering Contradiction:

Improvegrip qualityVSAvoidhandle structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The cover layer is made of SEBS-based thermoplastic elastomer specifically at the grip portions where user contact occurs, providing enhanced friction and comfort. This localized material selection improves grip quality only where needed, without adding complexity to the entire handle structure

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3496912B1Handle for a razor

Publication Date: 2020.09.23 THE GILLETTE CO

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AI summary

A handle (20) for a razor cartridge (27) is provided.