Knife Blade Guide for Accurate Cardboard Corner Cutting

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Solution Overview

Problem

Existing utility knives and box cutters lack effective guidance for cutting cardboard corners, leading to irregular cuts and potential safety issues, especially when trying to open taped boxes without damaging the contents.

Innovation Solution

A knife blade guide with a hollow main body and corner guides that include right and left guide arms positioned at a predetermined angle, allowing the guide to fit over a utility knife and accommodate the blade slot proximate to the corner of a container, providing precise guidance for cutting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the utility knife blade is extended to reach the corner of the cardboard box, then the cutting capability is improved, but the risk of damaging packaged goods and safety issues increases

Engineering Contradiction:

Improvecutting capabilityVSAvoiddamage to packaged goods

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a blade guide as an intermediary device between the utility knife and the cardboard corner. The guide features a corner guide portion with guide arms that contact the box sides, and a blade slot that controls blade positioning. This intermediary structure enables the blade to reach the corner effectively while preventing excessive blade extension that would damage goods or create safety hazards.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the utility knife blade is used without depth guidance, then the cutting reach is improved, but the precision of cutting depth control deteriorates

Engineering Contradiction:

Improvecutting reachVSAvoidcutting depth control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The blade guide serves as a mediator that provides both reach and precision. The guide body extends the effective cutting reach to the corner, while the blade slot within the guide body acts as a depth stop, precisely controlling how far the blade can extend beyond the guide. This dual function resolves the contradiction between reaching the corner and controlling cut depth.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the utility knife is used without corner guidance, then the ease of operation is improved, but the cut quality and regularity deteriorate

Engineering Contradiction:

Improveease of useVSAvoidcut quality

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The corner guide portion of the blade guide acts as a mediator that maintains ease of operation while ensuring cut quality. The guide arms contact the box sides to provide geometric guidance, and the strike plate with blade slot positions the blade correctly at the corner. This allows the user to simply follow the guide structure, maintaining ease of use while achieving regular, high-quality cuts.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250170740A1Knife blade guide and method

Publication Date: 2025.05.29 WILSON IAN

AI summary

A knife guide is disclosed which may include a hollow main body and a corner guide positioned on a front end of the hollow main body. The corner guide can have a right guide arm projecting from the front end, a left guide arm projecting from the front end, a blade slot positioned between the right guide arm and the left guide arm and wherein the right guide arm and the left guide arm are positioned at a predetermined angle apart from each other.