Vibration-Resistant Cargo Latch Using Segmented Magnetic Field
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Solution Overview
Problem
Existing digital security systems for cargo compartments in trucks often generate false tampering indications due to vehicle movement and vibrations from irregular road surfaces, leading to unnecessary cargo rejection.
Innovation Solution
A vibration-resistant digital security system utilizing an extended magnetic field along the latch surface, created by multiple spaced rare earth magnets, ensures that the magnetic field remains effective during latch movement, preventing false actuation signals and maintaining the displayed number unless the latch is significantly rotated from its engaged position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic reed switch and single magnet system is used to detect latch movement, then the system can detect when the cargo door is opened, but vehicle vibrations cause false tampering indications
Solution Approach 1:
The single magnet is divided into multiple magnets (first magnet and second magnet) spaced along the latch surface. This segmentation creates multiple magnetic field zones that work together to maintain a stable magnetic field connection with the reed switch during vibrations, preventing false actuation signals while still detecting intentional latch opening.
Solution Approach 2:
The magnetic field strength and distribution are optimized locally at different positions along the latch surface. The first and second magnets are positioned to create specific magnetic field zones that ensure the reed switch remains influenced during normal vibrations but detects field changes when the latch is intentionally opened.
2Reliability
If the magnetic field is extended along the latch surface with multiple magnets, then vibration resistance is improved, but the device complexity increases
Solution Approach 1:
The magnetic field is created by segmenting it into multiple discrete magnets rather than using a single large magnet. This segmentation allows the system to achieve vibration resistance through distributed magnetic fields while keeping each individual magnet simple and the overall arrangement manageable.
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
This solution effectively reduces false tampering indications caused by vehicle movement, ensuring accurate tracking of cargo access and preventing unnecessary cargo rejection by maintaining the displayed number unless the latch is intentionally opened.
Implementation Method 1
Magnetic means which are moveable with the part create a magnetic field elongated along the part surface for a given distance
Implementation Method 2
A magnetically actuated switch is situated proximate the path of movement of the part surface, such that the switch remains under the influence of the magnetic field during movement of the part from its said first position toward its second position within the given distance and thereafter generates the actuation signal to the counter
Data Source
AI summary
The latch for the cargo door is moveable between an engaged position wherein the door cannot be opened and a disengaged position wherein the cargo door can be opened to access the compartment. A counter displays a number which can be changed in response to an actuation signal. A series of spaced magnets moveable with the latch create a magnetic field which is elongated along the surface of the latch for a given distance. A magnetically actuated reed switch is situated proximate the path of movement of the latch surface, such that the switch remains under the influence of the magnetic field during movement of the latch from its engaged position toward its disengaged position within the given distance and thereafter changes state to generate an actuation signal to the counter.