Shaving Instrument Blade Clamp with Hinged Protrusions

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Solution Overview

Problem

Existing shaving instruments that use single-edged metal blades face challenges in supporting the blades securely within the shaving head, leading to potential blade movement during use, which can result in inefficient shaving and safety issues.

Innovation Solution

A shaving instrument design featuring a handle, a head with a slot for a blade clamp, and a blade clamp with hinged parts and protrusions to securely hold and position single-edged blades, preventing movement and ensuring easy replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If single-edged blades are supplied without cartridges, then cost is reduced and blade replacement is simplified, but blade stability and positioning reliability deteriorate

Engineering Contradiction:

Improveblade replacement simplicityVSAvoidblade positioning reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The blade clamp is divided into first and second parts that can be independently positioned and secured. The first part engages with the blade at one location while the second part engages at another location, providing distributed support that maintains blade stability without requiring a complete cartridge assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The blade clamp is received within a slot in the head structure, creating a nested arrangement where the clamp fits into a predetermined space. This nesting provides structural support and positioning guidance while keeping the blade clamp as a separate, replaceable component.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Device complexity

If simple blade support structure is used, then device complexity is reduced, but blade movement control deteriorates

Engineering Contradiction:

Improveblade support structure complexityVSAvoidblade position stability

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The blade clamp incorporates protrusions at specific locations that engage with corresponding features on the blade. These localized engagement points provide precise positioning control at critical areas without requiring complex structures throughout the entire clamp assembly.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The blade clamp is designed with movable parts that can be actuated to open and close around the blade. This dynamic capability allows the simple clamp structure to transition from an open state for easy blade insertion to a closed state that securely holds the blade in position.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12304094B2Shaving instrument

Publication Date: 2025.05.20 SGARRA ANDREW

AI summary

In a shaving instrument having one or more blades, each with a single exposed cutting, each blade is clamped between clamping parts hinged to one another in a unitary molded blade clamp. Following insertion of the blade or blades, the blade clamp is inserted into an end of an elongated slot in a head attached to a handle. The slot is shaped to allow movement of the blade clamp only along the direction of its insertion. The blades are secured against sliding in the blade clamp by engagement with protrusions formed on interior surfaces of clamping parts. The blades can be replaced when worn, but the clamping elements can be reused.