Lever-Driven Cutting Tool for Crack-Free Sheet Cutting

Solution Overview

Problem

Existing cutting tools for thin wooden or plastic polymer materials require large sizes, heavy weights, and external power sources, leading to structural complexity, high cost, and material cracking during cutting.

Innovation Solution

A cutting tool design featuring a bearing member, first and second cutting members, and a manipulation member, allowing manual operation with a lever mechanism to generate sufficient cutting force without external power, and incorporating an avoidance part to prevent material damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If external power sources (electric, pneumatic) are used to provide sufficient cutting force, then cutting power is improved, but device complexity and cost increase

Engineering Contradiction:

Improvecutting powerVSAvoidstructural complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The cutting tool uses the material itself as the power source. The material to be cut is fed into the cutting chamber where it contacts the cutting blade, and the material's own energy (through friction and pressure) drives the cutting action, eliminating the need for external power sources and reducing structural complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces complex mechanical power transmission systems (motors, pneumatic systems) with a simple mechanical cutting mechanism that relies on direct contact between the cutting blade and material, using basic mechanical principles of friction and pressure generation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Power

If external power sources are used to provide sufficient cutting force, then cutting power is improved, but weight increases

Engineering Contradiction:

Improvecutting powerVSAvoidtool weight

Core Design Contradiction:

PowerVSWeight of moving object

Solution Approach 1:

The cutting tool uses the material itself as the power source. The material to be cut is fed into the cutting chamber where it contacts the cutting blade, and the material's own energy (through friction and pressure) drives the cutting action, eliminating the need for external power sources and reducing structural complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces complex mechanical power transmission systems (motors, pneumatic systems) with a simple mechanical cutting mechanism that relies on direct contact between the cutting blade and material, using basic mechanical principles of friction and pressure generation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Force

If strong pressure is applied to cut strong materials, then cutting force is improved, but material cracking and damage occur

Engineering Contradiction:

Improvecutting forceVSAvoidmaterial cracking

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The cutting blade is designed with specific local properties (sharp edge geometry, appropriate hardness) that allow it to concentrate cutting force precisely at the contact point with the material, achieving effective cutting without applying excessive pressure that would cause cracking

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The cutting blade features a curved cutting edge rather than a straight edge, which allows for more uniform distribution of cutting pressure along the contact line, reducing stress concentration and preventing material cracking during the cutting process

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 tool is lightweight, cost-effective, and capable of cutting materials predictably without cracking, with a wide range of applications and improved operating efficiency.

Implementation Method 1

the second cutting member being pivotably coupled to the bearing member by the first axle... The manipulation member is configured to drive the second cutting member to pivot about the first axle

Methodology Applied

Scientific EffectLever mechanism: Lever

Data Source

PatentUS12600053B2Cutting tool

Publication Date: 2026.04.14 HANGZHOU UNITED TOOLS CO LTD

AI summary

A cutting tool includes a bearing member, a first cutting member, a second cutting member, a manipulation member, an avoidance part and a measuring member. The first cutting member is fixedly disposed on one side of the bearing member. The second cutting member is pivotable about a first axle provided on the bearing member, and the manipulation member is pivotable about a second axle provided on the bearing member. The manipulation member and the second cutting member make up an effort-saving lever, in which the manipulation member drives the second cutting member to move.