Tonneau Cover Coupling Strip End Cap Retention

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Solution Overview

Problem

Tonneau cover systems for pickup trucks face issues with premature engagement of coupling elements, leading to wrinkles and difficulty in securing the cover due to exposure to elements, and the desired movement between components causes end caps to be pushed off the side rails, while attempts to retain end caps with fasteners inhibit sliding movement.

Innovation Solution

A tonneau cover system with a first coupling strip and a side rail featuring an exterior channel and end cap with an exterior tab extension that engages the second coupling strip to limit longitudinal sliding movement, allowing for desired sliding action without creating weakened areas in the coupling strips.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If releasable coupling strips are used to attach the cover to side rails, then ease of operation is improved, but reliability deteriorates due to exposure to elements and wear from repetitive use

Engineering Contradiction:

Improveease of attachmentVSAvoidattachment reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent employs hook and loop fastening strips that are designed to be replaceable rather than permanent. These strips are intentionally made as consumable components that can wear out and be replaced, accepting their limited service life in exchange for providing easy attachment and detachment functionality throughout that period.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Adaptability or versatility

If the tonneau cover is allowed to expand and contract due to heat and cold exposure, then adaptability to environmental conditions is improved, but manufacturing precision deteriorates as the cover becomes loose or wrinkled

Engineering Contradiction:

Improveenvironmental adaptabilityVSAvoidcover tightness

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent incorporates coupling strips with intentional movement capability that allow the tonneau cover to dynamically adjust to thermal expansion and contraction. The strips can slide or move relative to each other within defined limits, enabling the system to adapt to temperature changes while maintaining adequate tension and preventing wrinkles through controlled movement rather than rigid fixation.

Inventive Principle:

Principle #15Dynamics

3Stability of the object's composition

If end caps are positively retained with fasteners, then stability of component position is improved, but ease of operation deteriorates by inhibiting sliding movement of coupling strips

Engineering Contradiction:

Improveend cap retentionVSAvoidcoupling strip movement

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent divides the retention system into separate functional zones: end caps are securely retained to the side rails through positive attachment, while coupling strips are allowed to slide within the end caps. This segmentation allows different components to have different degrees of freedom - the end caps remain stable while the coupling strips maintain mobility for proper engagement.

Inventive Principle:

Principle #1Segmentation

4Ease of operation

If coupling strips are allowed to slide freely, then ease of operation is improved for tensioning the cover, but device complexity increases due to forces pushing end caps off side rails

Engineering Contradiction:

Improvecover tensioningVSAvoidcomponent retention mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent introduces end caps as intermediary components between the sliding coupling strips and the fixed side rails. The end caps serve as mediators that receive the sliding motion and tensioning forces from the coupling strips while transferring stable retention to the side rails, thus enabling free sliding operation without requiring complex retention mechanisms on the side rails themselves.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9849765B2Tonneau cover system for a cargo box with side rail end plugs with external mounting extensions

Publication Date: 2017.12.26 TRUXEDO

AI summary

A side rail can define an exterior channel. A coupling strip can be slidably retained within the exterior channel of the side rail and can be positioned to selectively engage with a coupling strip of a tonneau cover. An end cap can be positioned on an end of the side rail. The end cap can include an exterior tab extension received within the exterior channel, and the exterior tab extension can have an end face positioned within the exterior channel and spaced from a corresponding end of the exterior channel. The end face of the exterior tab extension can be positioned to engage an opposing end face of the coupling strip within the exterior channel to positively limit longitudinal sliding movement of the coupling strip within the exterior channel.