Container Door Locking Assembly Axial Constraint
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Solution Overview
Problem
Conventional locking assemblies for cargo containers fail to effectively withstand racking forces, which can cause doors to shift vertically relative to the door frame, compromising the structural integrity and security of the container during transportation.
Innovation Solution
A locking assembly featuring an axially elongated lock rod with radial projections and guide plates that inhibit axial shifting movements, allowing the lock rod to rotate while maintaining the door in a closed position, thus enhancing the structural integrity and security by preventing racking forces from affecting the door's alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the door frame is fabricated with minimal structural strength to maximize cargo space, then the interior cargo space is increased, but the door frame becomes vulnerable to racking forces that cause door misalignment
Solution Approach 1:
The locking assembly is divided into separate functional components: the lock rod for rotation and locking, and the guide plates for preventing axial movement. This segmentation allows each component to specialize in one function, enabling the door frame to remain lightweight while the locking mechanism provides the necessary structural support against racking forces.
Solution Approach 2:
The guide plates act as intermediary elements between the lock rod and the door. They transfer and distribute the racking forces from the door to the lock rod, preventing these forces from misaligning the door relative to the door frame while allowing the lock rod to freely rotate for locking operations.
2Reliability
If the locking assembly must withstand racking forces to maintain door alignment, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The guide plates combine multiple functions into a single component: they guide the lock rod rotation, prevent axial movement of the lock rod, and distribute racking forces. This merging reduces the overall complexity compared to having separate components for each function.
Solution Approach 2:
The guide plates serve multiple purposes simultaneously: they act as bearings for lock rod rotation, as stoppers to prevent axial shifting, and as force distribution elements. This multi-functionality reduces the number of separate components needed, simplifying the overall assembly while maintaining reliability.
3Ease of operation
If the lock rod is allowed to rotate freely for door locking, then the ease of operation is improved, but axial shifting movements compromise the locking reliability
Solution Approach 1:
The constraint function is extracted from the lock rod itself and placed into the guide plates. The lock rod is designed to rotate freely without axial constraint, while the guide plates separately provide the axial constraint. This separation allows the lock rod to be simple and easy to operate while the guide plates ensure reliability by preventing axial shifting.
Solution Approach 2:
The locking mechanism is segmented into rotational freedom (lock rod) and axial constraint (guide plates). This segmentation allows each component to optimize its specific function: the lock rod provides easy rotation for operation, while the guide plates provide reliable axial positioning through their engagement with the lock rod's radial projections.
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 locking assembly effectively maintains the door in a closed position and prevents racking movements, ensuring the structural integrity and security of the container by combining the lock rod's rotation with the guide plates' axial inhibition, thereby enhancing the container's ability to withstand transportation forces.
Implementation Method 1
Each guide plate further includes structure for allowing each plate to be fastened to the door. The first guide plate defines a first plate portion which extends into the channel between said first and second axially spaced radial projections on the lock rod when said first guide plate is fastened to the door with the lock rod trapped between said first guide plate and said door. With the guide plate fastened to the door, the first plate portion on the guide plate and the first and second axially spaced radial projections on the lock rod combining to inhibit axial shifting movements of the lock rod.
Data Source
AI summary
A locking assembly for a swinging door of a container. The locking assembly includes an axially elongated lock rod having cam structure at opposed ends thereof. The lock rod is provided, toward each end thereof, with axially spaced radial projections which are axially fixed relative to the lock rod and define a channel therebetween. The locking assembly further includes a pair of guide plates; with each guide plate rotatably accommodating a lengthwise portion of the lock rod between the plate and the door. Each guide plate further includes structure for allowing each plate to be fastened to the door. After each guide plate is fastened to the door, a portion of each plate is entrapped between the axially spaced radial projections on the lock rod whereby inhibiting axial shifting movements of the lock rod.