Pull-Type Cutters Side-by-Side Lever Inversion

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Solution Overview

Problem

Conventional hand-held cutters are inefficient and unsafe for cutting rigid materials due to interference from moving handle arms and potential harm from sharp edges, especially when making angled cuts.

Innovation Solution

The design features a side-by-side configuration of levers with a cutting lever that rotates relative to the other levers, allowing for precise cutting without interference and improved safety by positioning the cutting edge away from the user's hands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional cutters are used to cut rigid material, then cutting function is achieved, but the handle arms interfere with the material and create safety hazards

Engineering Contradiction:

Improvecutting operationVSAvoidhandle arm interference and sharp edge hazards

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional cutter design by positioning the cutting blades at the handle ends rather than extending forward from a central pivot. This inversion allows the user to pull the cutters toward themselves rather than push away, eliminating the interference problem where handle arms brush against cut rigid material. The cutting edges are repositioned to face the material from the handle end, creating a safe pulling motion where sharp edges remain confined to the handle area.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces a side-by-side lever configuration where the first and second levers are positioned laterally adjacent to each other rather than one above the other. This lateral arrangement, combined with the cutting lever extending perpendicular to the other levers, creates a three-dimensional spatial relationship that allows the cutting edge to approach material from a different dimension, avoiding interference with the user's hand position.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If cutting blades extend forward from pivot member, then cutting capability is provided, but sharp edges face away from user creating safety risk

Engineering Contradiction:

Improvecutting capabilityVSAvoidsharp edge safety hazard

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The cutting blades are inverted to extend from the handle ends toward the material rather than from a forward pivot point. This repositioning ensures that when the user closes the cutters, the sharp cutting edges are contained within the handle assembly area, facing the material from the user's perspective rather than projecting forward away from the user.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If user pushes cutters away while operating, then cutting action is achieved, but difficulty increases when cutting rigid material at angles

Engineering Contradiction:

Improvecutting efficiencyVSAvoidangled cutting operation

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent changes the pushing motion to a pulling motion by inverting the cutter design. Instead of pushing cutters away from the body, the user pulls the handle assembly toward themselves. This pulling motion provides better control and ergonomics, especially when making angled cuts in rigid materials, as the user can maintain a more stable hand position and apply force more effectively.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Enables efficient and safe cutting of various materials, including rigid ones, by minimizing interference and reducing the risk of injury from sharp edges during operation.

Implementation Method 1

a first member rotatably coupling the first lever to the second lever, a second member coupling the cutting lever to at least one of the first lever or the second lever, the second member providing a pivot for the cutting lever to rotate relative to the second lever

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentUS10730195B2Pull-type cutters

Publication Date: 2020.08.04 BRAINARD PAUL

AI summary

One feature pertains to cutters that include a first lever, a second lever having a bottom edge, and a cutting lever having a top edge. A first member rotatably couples the first lever to the second lever, a second member couples the cutting lever to the first lever and/or the second lever, where the second member provides a pivot for the cutting lever to rotate relative to the second lever. A means for rotating the cutting lever relative to the second lever to move the top edge toward or away from the bottom edge when the first lever's first end is moved relative to the second lever's first end is provided, where the first lever, the second lever, and the cutting lever are arranged in a side-by-side configuration such that each has a longitudinal axis that is parallel to each other when the cutters are in a closed position.