Automated Loading Dock Vehicle Restraint Arm
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Solution Overview
Problem
Existing mechanical vehicle restraints at loading docks are complex, costly, and prone to errors due to insufficient robustness, making it difficult to reliably prevent vehicles from rolling away during loading and unloading, which can lead to safety and equipment issues.
Innovation Solution
A vehicle restraint system comprising a base, rotatably mounted arm, arm rotator, contact sensor, position sensor, lock, and controller that automatically adjusts the arm's position to restrain vehicles, ensuring accurate engagement and disengagement, and provides user feedback on the restraint status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wheel chocks are used to restrain vehicles, then the system is simple and cost-effective, but reliability is poor due to operator error and difficulty in ensuring correct placement
Solution Approach 1:
The system automatically detects vehicle presence through sensors and actuates the arm to engage with the vehicle without operator intervention. The controller monitors sensor inputs and autonomously controls the arm rotator and lock actuator, eliminating the need for manual chock placement and ensuring consistent reliable operation.
Solution Approach 2:
Manual mechanical wheel chocks are replaced with an automated electromechanical system featuring sensors, controllers, and motorized actuators. This substitution transforms the simple but unreliable manual system into a complex yet reliable automated system that eliminates human error.
2Reliability
If automated mechanical restraints are implemented, then reliability improves through automatic operation, but device complexity and cost increase due to additional components
Solution Approach 1:
The single arm structure performs multiple functions: it detects vehicle presence, positions itself to engage the vehicle, provides the restraining force, and locks into position. This multi-functionality reduces the need for separate components for each function, thereby reducing overall system complexity while maintaining high reliability.
Solution Approach 2:
The system incorporates sensors that continuously monitor vehicle presence and arm position, providing feedback to the controller. This feedback loop enables automatic adjustment and verification of restraint engagement, ensuring reliable operation while using a streamlined component structure.
3Strength
If existing mechanical restraints are used, then vehicle restraint is provided, but robustness is insufficient to withstand loading dock environment and components fail
Solution Approach 1:
The arm is constructed from heavy-duty steel or other high-strength materials capable of withstanding the demanding loading dock environment. This use of robust materials ensures the component can handle repeated use and environmental stresses without failure, while the integrated design keeps the overall structure relatively simple.
4Ease of operation
If the arm rotates freely without locking, then ease of operation improves for vehicle engagement and disengagement, but reliability decreases as the arm cannot maintain restraining position
Solution Approach 1:
The arm transitions between dynamic and static states based on operational requirements. During vehicle engagement and disengagement, the arm rotates freely under motor control. Once positioned, the lock actuator engages to maintain a stable static position, providing both ease of operation and reliable position maintenance.
Solution Approach 2:
The lock actuator is positioned and configured in advance to engage with the arm at the correct restraining position. This preliminary arrangement ensures that when the arm reaches the desired position, the lock can immediately engage to maintain reliability without requiring additional adjustment or intervention.
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 system effectively prevents vehicles from rolling away by ensuring accurate and reliable engagement of the arm with the vehicle, reducing the risk of accidents and equipment damage while being more robust and cost-effective than existing solutions.
Implementation Method 1
a contact sensor for detecting contact between said arm and said vehicle
Implementation Method 2
a position sensor to detect the rotational position of said arm
Implementation Method 3
an arm rotator for rotating said arm between said lowered and upright positions
Implementation Method 4
a lock actuator in operative communication with and responsive to the contact sensor and position sensor for actuating said lock to retain said arm when in said upright position
Data Source
AI summary
The invention relates to a system for restraining a vehicle at a loading dock, having a base, an arm rotatably mounted to the base for rotating between a lowered position out of contact with the vehicle, a partially elevated position and an upright position for contacting the vehicle to restrain the vehicle in a position suitable for loading or unloading, an arm rotator, a position sensor to detect the rotational position of the arm, a lock and a lock actuator for locking the arm, and a controller in operative communication with the position sensor for determining the position of the vehicle relative to the dock upon contact between the arm and the vehicle for actuating the lock to retain the arm in the upright position to restrain the vehicle.