Lockable Latch Assembly for Retractable Truck Bed Covers
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Solution Overview
Problem
Existing retractable cover systems for pickup truck beds require frequent adjustments and are not capable of securely gripping guide rails at all positions, leading to inconsistent functionality and user dissatisfaction.
Innovation Solution
A lockable latch assembly with a pointed-tip fastener supported by a leaf spring, which automatically adjusts to accommodate variations in the guide rail surface, and can be easily adjusted using a single-handed Allen wrench if needed, ensuring secure engagement and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lever latch with cap screw and lock nut is used to grip the guide rail, then the latch can be adjusted to grip at specific locations, but frequent adjustments are required due to wear and variations along the guide rail length
Solution Approach 1:
The latch assembly is designed to self-adjust along the guide rail through the interaction of the angled surface and cam mechanism. As the latch moves along the rail, the cam automatically adjusts the engagement position, eliminating the need for manual adjustment by the user while maintaining reliable gripping at any position.
Solution Approach 2:
The invention changes the engagement parameter from a fixed cap screw position to a dynamically adjustable cam mechanism. The cam profile is designed to vary the engagement depth and position automatically, allowing the latch to adapt to variations in the guide rail geometry without requiring manual parameter changes.
2Reliability
If the cap screw is adjusted to properly grip the guide rail at one location, then secure gripping is achieved at that position, but the latch becomes incapable of properly gripping the guide rail at other locations along its length
Solution Approach 1:
The latch assembly transitions from a static cap screw engagement to a dynamic cam-based mechanism. The cam profile is specifically designed to maintain consistent gripping force across multiple positions along the guide rail, allowing the engagement parameters to change dynamically as the latch moves, thereby achieving both consistency and adaptability.
Solution Approach 2:
The engagement surface is segmented into multiple zones along the cam profile, each optimized for different positions on the guide rail. This segmentation allows the latch to properly engage at various locations without requiring adjustment, as each segment of the cam profile compensates for variations at different positions.
3Reliability
If a two-handed, two-tool effort is used to adjust the cap screw and lock nut combination, then proper operation can be maintained, but the adjustment process becomes tedious and time consuming
Solution Approach 1:
The cam mechanism automatically maintains proper operation through its geometric design, eliminating the need for manual adjustment by the user. The self-adjusting nature of the cam profile compensates for wear and variations automatically, reducing maintenance time while preserving operational reliability.
Solution Approach 2:
The invention extracts the adjustment function from the user-operated domain and embeds it within the mechanical design of the cam mechanism itself. This removes the need for user intervention in the adjustment process, thereby eliminating the time loss associated with manual adjustments while maintaining reliable operation.
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 lockable latch assembly provides extended reliable operation without frequent adjustments, securely gripping guide rails at any position along their length, enhancing user satisfaction and operational efficiency.
Implementation Method 1
a pointed-tip fastener supported by a leaf spring, which automatically adjusts to accommodate variations in the guide rail surface
Implementation Method 2
a single torsion spring not only to bias the handle toward an open and unlatched position relative to the housing
Data Source
AI summary
A lock for a retractable cover which overlies a bed of a pickup truck has a cover-connectable housing and a handle that pivots relative to the housing for clamping a pointed tip of a flexibly mounted fastener into engagement with a nearby member such as a guide rail extending along one side of the bed of a pickup truck to retain a housing-connected retractable cover in a chosen position. A push button trigger pivoted on the handle is depressable to unlatch the handle and thereby release the clamping action of the handle. A torsion spring biases the trigger relative to the handle. A compression spring biases the handle relative to the housing. A leaf spring flexibly mounts the fastener on the handle. A key-operated plug assembly may retain the trigger in a latched position.