Cargo Container Door Plate Lock With Gravity-Actuated Cam
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Solution Overview
Problem
Current trailer locks for cargo containers are vulnerable to easy breach by criminals, leading to significant financial losses due to tampering and theft, exacerbated by the availability of power tools.
Innovation Solution
A plate lock device with a gravity-based locking system using a steel plate and a locking mechanism comprising a shaft, cam, and spring, which secures the cargo container doors by rotating cams to lock and unlock positions based on the plate's weight, requiring heavy machinery for unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional trailer locks are used, then the locking mechanism is simple and easy to operate, but the security against criminal breach is insufficient
Solution Approach 1:
The locking mechanism uses a dynamic cam that rotates between locked and unlocked positions, transforming a static lock into a dynamic system that requires active manipulation to breach. The cam's rotation creates moving parts that increase the complexity of forced entry while maintaining operational simplicity through gravity-based actuation.
Solution Approach 2:
The locking mechanism embeds multiple functional elements within the single plate structure, including the cam, shaft, and spring all contained within the plate's thickness. This nested arrangement increases security through layered complexity while keeping the overall device compact and easy to install.
2Reliability
If a gravity-based locking system is used, then heavy machinery is required for unauthorized access, but the device weight increases
Solution Approach 1:
The system uses the plate's own weight as a security mechanism, where the heavy plate must be lifted by external force (heavy machinery) to overcome the gravity-based locking action. The weight that increases device mass also serves as the counterweight that prevents unauthorized removal or manipulation of the lock.
Solution Approach 2:
The locking mechanism is self-actuating through gravity, requiring no external power source or complex actuation system. The plate's weight automatically engages the locking action when installed, and the spring provides automatic resetting, making the system self-sufficient while the weight itself becomes the security feature.
3Strength
If the cam is designed with larger cross-sectional dimensions, then the locking engagement is more robust, but the cam cannot be inserted through standard openings
Solution Approach 1:
The cam rotates during installation and operation, changing its effective cross-sectional profile. During insertion, the cam presents its minimum cross-section to fit through the opening, then rotates to engage with its larger cross-section providing robust locking. This dynamic orientation resolves the contradiction between insertion feasibility and locking strength.
Solution Approach 2:
The solution moves the problem from a two-dimensional cross-sectional constraint to a three-dimensional rotational solution. Instead of forcing a large cross-section through an opening, the cam uses rotation to bring different cross-sectional profiles into play at different stages, allowing insertion with minimum dimension and engagement with maximum dimension.
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 device provides robust security by ensuring that cargo containers cannot be opened without heavy machinery, thus deterring theft and tampering, while seamlessly integrating with international transportation logistics without disrupting the supply chain.
Implementation Method 1
The spring is configured to cause the cam to rotate from a first position to a second position
Implementation Method 2
A plate lock device with a gravity-based locking system using a steel plate
Data Source
AI summary
Various implementations include a plate lock device for blocking doors of a cargo container. The device includes a plate and a locking mechanism. The plate has a plate longitudinal axis, a first side, a second side, a first plate end portion, and a second plate end portion. The locking mechanism is located at the first plate end portion. The locking mechanism includes a shaft, a cam, and a spring. The shaft has a shaft longitudinal axis and a first shaft end portion extending away from the second side of the plate. The cam is coupled to the first shaft end portion and is rotatable about the shaft longitudinal axis relative to the plate. The spring is configured to cause the cam to rotate from a first position to a second position. The cam is biased by the spring toward the first position and is urgable toward the second position.