Mechanical Depth Guide for Paving Machine Screed Thickness Control

Solution Overview

Problem

Road paving machines often struggle to maintain the correct pavement layer thickness due to variations in the roadbed, leading to either insufficient or excessive material usage, which is costly and affects durability, and existing electronic thickness detection devices are expensive and complex, making them inaccessible to smaller machines.

Innovation Solution

A mechanical depth guide attached to the screed of a road paving machine, featuring a depth indicator and optional extension arm and depth control gauge, provides a visual indication of pavement layer thickness, allowing operators to dynamically adjust the screed height without electronic components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electronic thickness detection devices are used, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvepavement layer thickness detectionVSAvoiddevice structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces electronic thickness detection devices with a simple mechanical depth guide system. The depth guide consists of a vertical indicator arm attached to the screed that extends downward to just above the roadbed surface. This mechanical system provides visual indication of pavement layer thickness through the position of the indicator relative to the roadbed, eliminating the need for complex electronic transmitters, sensors, and processors while maintaining adequate measurement precision for operational adjustments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs a simple, inexpensive mechanical depth guide that can be easily attached to and removed from the screed. The depth guide consists of basic mechanical components including an indicator arm, attachment mechanism, and optional extension arm, all of which can be manufactured at low cost. This simple mechanical system replaces expensive electronic detection devices, making the thickness monitoring capability accessible to smaller road paving machines that cannot afford complex electronic systems.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Measurement precision

If electronic thickness detection devices are used, then measurement precision is improved, but cost increases

Engineering Contradiction:

Improvepavement layer thickness detectionVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces expensive electronic thickness detection devices with a simple mechanical depth guide system. The depth guide consists of a vertical indicator arm attached to the screed that extends downward to just above the roadbed surface. This mechanical system provides visual indication of pavement layer thickness through the position of the indicator relative to the roadbed, eliminating the need for complex electronic transmitters, sensors, and processors while maintaining adequate measurement precision for operational adjustments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs a simple, inexpensive mechanical depth guide that can be easily attached to and removed from the screed. The depth guide consists of basic mechanical components including an indicator arm, attachment mechanism, and optional extension arm, all of which can be manufactured at low cost. This simple mechanical system replaces expensive electronic detection devices, making the thickness monitoring capability accessible to smaller road paving machines that cannot afford complex electronic systems.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Device complexity

If operator visually assesses screed height, then device complexity is reduced, but measurement precision deteriorates

Engineering Contradiction:

Improvedetection deviceVSAvoidscreed height assessment

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces a mechanical depth guide as an intermediary device between the screed and the operator's visual assessment. The depth guide includes a vertical indicator arm that extends downward from the screed to a position just above the roadbed surface. This intermediary mechanism translates the abstract concept of screed height into a direct visual reference point, allowing operators to accurately assess pavement layer thickness by observing the indicator's position relative to the roadbed without requiring complex electronic systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11933000B2Depth guide for paving machine

Publication Date: 2024.03.19 PATTERSON SAMUEL C

AI summary

A depth guide to be used with a road paving machine having a movable screed, said depth guide allowing the operator of the road paving machine a simple means for visually assessing whether the pavement layer being deposited by the road paving machine and formed by the screed is of the proper thickness.