Reversible Grader Blade with Expanded Metal Smoothing Surface

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Solution Overview

Problem

Conventional surface graders require the tractor to change direction to create a second parallel grade line, and existing grader attachments lack a sufficient smoothing surface and weight distribution for effective soil leveling.

Innovation Solution

A grader/scraper unit with a reversible steel blade and an extensive smoothing surface made of expanded metal grating, weighing at least 4 pounds per square foot, attached to a steel frame, allowing the blade to be perpendicular to the ground and dispersing larger material while allowing suitable material to pass underneath, with adjustable height and angle options.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional linear graders are used, then grading can be performed, but the tractor must change direction at the end of each grade line reducing productivity

Engineering Contradiction:

Improvegrading efficiencyVSAvoidtime for direction change

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent inverts the conventional grader configuration by placing the grading blade at the rear of the attachment rather than the front. This rear-mounted blade configuration allows the attachment to work in reverse directions without requiring the tractor to reposition, enabling continuous grading operations across multiple passes and eliminating the time loss associated with direction changes at grade line endings.

Inventive Principle:

Principle #13The other way round (Inversion)

2Manufacturing precision

If existing grader attachments are used, then soil grading is possible, but the smoothing surface is insufficient for effective leveling

Engineering Contradiction:

Improvesoil leveling qualityVSAvoidsmoothing surface area

Core Design Contradiction:

Manufacturing precisionVSArea of stationary object

Solution Approach 1:

The patent transitions from conventional small-area smoothing surfaces to a large expanded metal grating surface that covers the entire rear portion of the attachment. This expanded grating surface, weighing at least 4 pounds per square foot, provides extensive contact area with the soil, enabling effective smoothing and leveling across a much broader workspace than traditional grader attachments.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Stress or pressure

If a heavy smoothing surface is used, then consistent pressure is applied for better grading, but the overall weight increases

Engineering Contradiction:

Improvepressure on soil surfaceVSAvoidgrader attachment weight

Core Design Contradiction:

Stress or pressureVSWeight of moving object

Solution Approach 1:

The patent employs expanded metal grating as a composite material that provides both the necessary weight (at least 4 pounds per square foot) for consistent soil pressure and the structural characteristics needed for effective smoothing. This grating material offers a favorable strength-to-weight ratio, distributing the attachment's overall weight evenly across the large surface area to maintain uniform pressure on the soil without requiring excessive total weight.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS11812677B2Surface grader attachment for a tractor

Publication Date: 2023.11.14 PARTH GERALDINE

AI summary

A surface grader mechanism that is attached to, and dragged behind, tractors or other towing vehicles. This implementation of such a surface grader includes a blade at the leading edge that may be adjusted to any height or any transverse, horizontal angle above the metal grating on the bottom of the surface grader.