Rivetless Composite Sidewall Construction for Cargo Containers

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Solution Overview

Problem

Cargo container sidewall designs face challenges in achieving lightweight yet rigid structures with minimal protrusions and snag points, easy panel replacement, and cost-effective manufacturing, while maintaining structural integrity and maximizing interior space.

Innovation Solution

A rivetless and boltless sidewall construction using composite panels with posts that incorporate ratcheting grooves and adhesive for secure attachment, allowing for easy panel replacement and minimizing protrusions, combined with logistics slots for securing cargo.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If vertical posts are used to provide structural integrity, then strength and rigidity are improved, but sidewall thickness increases

Engineering Contradiction:

Improvestructural integrityVSAvoidsidewall thickness

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The patent replaces traditional mechanical connection systems (bolts, rivets, welds) with an adhesive bonding system. The adhesive is applied in a bead pattern between the structural panel and the vertical post, creating a strong bond without requiring mechanical fasteners. This substitution reduces sidewall thickness by eliminating the need for thick posts that would accommodate mechanical connections, while maintaining structural integrity through the adhesive bond.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs composite construction by combining structural panels with vertical posts using adhesive bonding. This composite approach allows the use of thinner post materials since the adhesive distributes loads across the bonding surface, rather than concentrating stresses at mechanical connection points. The composite system achieves required strength with reduced individual component thicknesses.

Inventive Principle:

Principle #40Composite materials

2Strength

If bolts or rivets are used for assembling sidewalls, then structural integrity is improved, but construction time and manufacturing cost increase

Engineering Contradiction:

Improvestructural integrityVSAvoidconstruction time

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The patent replaces mechanical fastening systems (bolts, rivets) with an adhesive bonding system. The adhesive is applied in a continuous or patterned bead between the structural panel and vertical post, eliminating the need for drilling, fastener installation, and associated sealing operations. This substitution significantly reduces construction time while maintaining structural integrity through the adhesive bond's load-bearing capacity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If structural panels are joined with vertical posts, then structural integrity is improved, but protrusions and snag points increase

Engineering Contradiction:

Improvestructural integrityVSAvoidprotrusions and snag points

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent replaces mechanical connection systems that create protruding fasteners and connection hardware with an adhesive bonding system. The adhesive bond creates a flush, smooth transition between the structural panel and vertical post, eliminating protrusions and snag points that would otherwise be generated by bolts, rivets, or welds. This maintains structural integrity while providing a smooth exterior surface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Strength

If thicker sidewalls are used, then structural integrity is improved, but interior space decreases

Engineering Contradiction:

Improvestructural integrityVSAvoidinterior space

Core Design Contradiction:

StrengthVSVolume of moving object

Solution Approach 1:

The patent replaces mechanical connection systems with adhesive bonding, enabling the use of thinner vertical posts and structural panel joints. This reduction in connection system thickness directly increases the interior cargo space of the container while maintaining structural integrity through the adhesive's load-bearing capacity. The adhesive allows for optimized, thinner wall sections that maximize interior volume.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution provides a lightweight, rigid, and aerodynamic sidewall construction with reduced snag points, enabling easy panel replacement and enhanced cargo security, while maintaining structural integrity and maximizing interior space without increasing manufacturing costs.

Implementation Method 1

A rivetless and boltless sidewall construction using composite panels with posts that incorporate ratcheting grooves and adhesive for secure attachment

Methodology Applied

Scientific EffectAdhesive: Adhesive

Data Source

PatentUS8540099B2Container sidewall connector

Publication Date: 2013.09.24 VANGUARD NATIONAL TRAILER CORP

AI summary

Presented is a composite panel container sidewall construction that provides additional interior logistics slots in the sidewalls of the container for securing cargo loaded into the container. The sidewall is constructed from posts, outer sheets, inner liners, and logistics panels. The outer sheets have inward protrusions that are secured into pockets in the posts. The logistic panels may include logistic slots that may be used to secure cargo or tie downs to the sidewall of the trailer.