Truck Tonneau Cover Lock Bar Mechanism for Security
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Solution Overview
Problem
Existing tonneau cover systems for truck cargo boxes face challenges in providing effective unauthorized access protection without increasing assembly and manufacturing costs or complexity, and lack a positive stop to resist upward movement of the tonneau cover.
Innovation Solution
A tonneau cover system with slidably supported lock bars and actuators that move between unlocked and locked positions, interengaging with locking surfaces of rectangular elements to limit upward movement, and featuring a design with upper and lower longitudinal margins to prevent rotation and upward movement when locked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple individual latching components are provided on each rectangular element to engage the side rail, then protection against unauthorized access is improved, but device complexity and manufacturing costs increase significantly
Solution Approach 1:
Multiple individual latching components on separate rectangular elements are merged into a single long movable latching component that spans across multiple rectangular elements. This single component engages with the side rail to provide unified protection, reducing the total number of parts while maintaining security effectiveness.
Solution Approach 2:
The single long movable latching component serves multiple functions: it latches multiple rectangular elements simultaneously, provides a positive stop to resist upward movement, and engages with the side rail to secure the entire tonneau cover assembly. This multi-functional design eliminates the need for separate latching mechanisms on each element.
2Device complexity
If a single long movable latching component is provided on each side rail, then device complexity is reduced, but the ability to resist upward movement of the tonneau cover is insufficient due to lack of positive stop
Solution Approach 1:
The single long movable latching component is segmented into multiple engagement points along its length, with lateral protrusions that can engage with corresponding features on the side rail. This segmentation allows the component to provide both the simplified single-component design and the multiple contact points needed to resist upward movement effectively.
3Ease of manufacture
If a single long movable latching component is used, then assembly and manufacturing costs are reduced, but additional protection against upward movement is needed
Solution Approach 1:
The latching function and the upward movement resistance function are merged into a single long movable latching component. This component simultaneously provides lateral latching engagement and vertical support through its extended structure and engagement points, eliminating the need for separate components while maintaining both functions.
Data Source
AI summary
A lock bar can be laterally slidable between an unlocked position in which the lock bar is laterally recessed relative to the side rail and a locked position in which the lock bar is laterally extended relative to the side rail. A side rail supported actuator can include a longitudinally extending actuator arm engageable with the lock bar to slide the lock bar between the unlocked position and the locked position and engageable with, and movable by, the tonneau cover as the tonneau cover moves from the open cover position to the closed cover position. Movement of the lock bar between the locked position and the unlocked position can simultaneously interengage and disengage, respectively, with each of the locking surfaces of the plurality of rectangular elements, which interengagement limits upward movement of the rectangular elements.