Spring-Lid Razor Cutter for Precise Cutting and Finger Protection

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Solution Overview

Problem

Existing hand-held cutting devices, such as razor blades, lack flexibility, sharpness, and safety, often causing user injuries during cutting operations, especially with double-edged blades that lack proper protection and can lead to cuts and lacerations.

Innovation Solution

A hand-held cutting device with a body, lid, and spring mechanism that securely mounts a razor blade, partially exposing the cutting edge while covering the rest, featuring indentations for efficient finger force transfer and a pivotable lid for safe operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a double edged razor blade is used for precise cutting, then cutting precision is improved, but user safety deteriorates due to exposed sharp edges causing cuts and lacerations

Engineering Contradiction:

Improvecutting precisionVSAvoiduser safety

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The razor blade is segmented into multiple cutting edges (first cutting edge and second cutting edge) with different exposure levels. The first cutting edge is partially exposed for precise cutting operations, while the second cutting edge remains covered by the lid for safety. This segmentation allows the device to provide precise cutting functionality while minimizing exposure of sharp edges to users.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lid acts as an intermediary element between the user and the razor blade. It selectively covers the second cutting edge while allowing the first cutting edge to be partially exposed for cutting operations. The lid serves as a protective mediator that enables precise cutting when needed while preventing direct contact with dangerous sharp edges during normal operation and maintenance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If more of the razor blade is exposed for flexibility and sharpness, then cutting performance is improved, but the risk of finger cuts and lacerations increases

Engineering Contradiction:

Improvecutting flexibility and sharpnessVSAvoidrisk of finger cuts

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Different parts of the razor blade have different exposure qualities. The first cutting edge is designed to be partially exposed to provide the necessary flexibility and sharpness for precise cutting operations. In contrast, the second cutting edge is kept covered by the lid to eliminate the hazard of finger cuts. This local differentiation of exposure quality allows the device to maintain cutting performance while minimizing safety risks.

Inventive Principle:

Principle #3Local quality

3Ease of repair

If the lid is fully opened to access the razor blade for maintenance, then ease of blade replacement is improved, but exposure to sharp edges increases

Engineering Contradiction:

Improveblade replacement easeVSAvoidexposure to sharp edges

Core Design Contradiction:

Ease of repairVSObject-affected harmful factors

Solution Approach 1:

The second cutting edge is extracted from the exposed area and kept covered by the lid even when the lid is opened for maintenance. The lid can be opened to access the razor blade for replacement, but the design ensures that the most dangerous second cutting edge remains covered, thereby reducing exposure to sharp edges during maintenance operations while still allowing easy blade replacement.

Inventive Principle:

Principle #2Taking out (Extraction)

4Object-affected harmful factors

If a single edged razor blade is used for safety, then user protection is improved, but cutting flexibility and precision are reduced

Engineering Contradiction:

Improveuser protectionVSAvoidcutting flexibility

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The lid is designed to be movable, allowing dynamic adjustment of the exposure level of the first cutting edge based on operational needs. When precise cutting is required, the lid can be opened to expose the first cutting edge. When safety is the priority or cutting is not in progress, the lid can be closed to cover both cutting edges. This dynamic capability allows the device to transition between safety and flexibility modes, overcoming the limitation of static single-edged designs.

Inventive Principle:

Principle #15Dynamics

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

The device provides precise cutting while significantly reducing the risk of user injuries by ensuring only the necessary cutting edge is exposed and using a spring mechanism for secure closure, enhancing safety and efficiency.

Implementation Method 1

The spring is coupled between the body and the lid

Methodology Applied

Scientific EffectSpring mechanism: Spring

Data Source

PatentUS20260001247A1Safety cutting device and method

Publication Date: 2026.01.01 ZHANG XIANGYANG

AI summary

A cutting device and a method are designed to facilitate precise cutting and prevent a user from cutting fingers and hands. The cutting device includes a body and a lid. The body has a mounting mechanism, to which a razor blade is removably attached. The lid is pivotably coupled to the body by a spring. Moreover, the lid partially covers the razor blade so that at least one cutting edge of the razor blade is exposed. Thus, the cutting device safeguards the razor blade and protects the user's fingers, hands, and other body parts while allowing at least one cutting edge of the razor blade for cutting operations.