Paving Screed Bypass Prevention Plate

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Solution Overview

Problem

Paving material leakage occurs between the main screed and extension screeds of paving machines when the extension screeds are fully-extended, leading to undesirable streaks of uncompacted material, which existing solutions do not adequately address, especially in rear-mounted screed assembly designs with tamper bars.

Innovation Solution

A material bypass prevention plate with a projection is affixed to the extension screed, extending into the gap between the main and extension screeds, and featuring a chamfered edge to prevent compaction and redirect the material to the front of the extension screed, ensuring uniform paving.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If extension screeds are fully-extended to adjust for varying ground surface widths, then the screed assembly can accommodate wider paving surfaces, but paving material leaks through the gap between main screed and extension screeds causing streaks

Engineering Contradiction:

Improveadjustment for varying ground surface widthsVSAvoidpaving material leakage and streak formation

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

A material bypass prevention plate is introduced as an intermediary component between the main screed and extension screed. This plate includes a projection that extends into the gap to block paving material from leaking through, while allowing the extension screed to maintain its extended position for width adjustment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The prevention plate is divided into multiple functional segments: a main plate body that blocks material leakage, and a projection segment that specifically targets the gap area. This segmentation allows each part to perform its specific function efficiently while working together as a integrated solution.

Inventive Principle:

Principle #1Segmentation

2Productivity

If tamper bars are used to pre-compact paving material, then compaction efficiency is improved, but paving material is pushed forward causing it to bypass blocking systems and leak through gaps

Engineering Contradiction:

Improvecompaction efficiencyVSAvoidmaterial bypass and leakage

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The material bypass prevention plate with its projection is positioned in advance to counteract the forward-pushing action of the tamper bar. The projection creates a physical barrier that prevents material pushed by the tamper bar from bypassing the blocking system and leaking through the gap.

Inventive Principle:

Principle #9Preliminary anti-action

3Length of moving object

If a gap exists between main screed and extension screed when extension screed is fully-extended, then lateral extension capability is maintained, but uncompacted paving material leaks through causing undesirable streaks

Engineering Contradiction:

Improvelateral extension capabilityVSAvoidmat uniformity and quality

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The prevention plate with its projection provides localized blocking quality at the specific gap area between main screed and extension screed. This allows the gap to remain open for lateral extension capability while the projection locally prevents material leakage, maintaining both extension capability and mat uniformity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9683337B2Paving machine screed assembly with material bypass prevention plate

Publication Date: 2017.06.20 CATERPILLAR PAVING PROD INC

AI summary

A screed assembly for a paving machine may comprise a main screed and an extension screed configured to extend from the main screed to a fully-extended position. The extension screed may include a deflector and a material bypass prevention plate affixed to the extension screed. The material bypass prevention plate may have a projection that extends into and fills a space between the material bypass prevention plate and the main screed when the extension screed is in the fully-extended position.