Dock Leveler Optical Sensor Monitoring Safety
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Solution Overview
Problem
Current dock leveler systems lack effective monitoring capabilities to detect personnel presence, obstruction on the deck, and optimal deck elevation for material handling equipment, leading to potential safety hazards and operational inefficiencies.
Innovation Solution
The implementation of touchless sensors with 3D and 2D fields of view to monitor the loading dock area, detecting personnel, obstructions, and deck elevation, ensuring the deck is at a safe angle for material handling equipment and preventing the dock leveler from operating when obstructions are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional contact-based sensors are used to monitor the dock leveler, then the system can detect deck position and obstructions, but the sensors may fail or give false readings when exposed to dust, moisture, and physical contact in the harsh loading dock environment
Solution Approach 1:
The patent replaces mechanical contact-based sensors with optical sensors that detect deck position and obstructions using light fields. The optical sensor system includes a light source and sensor array that detect changes in light reflection and obstruction patterns, eliminating the need for physical contact between sensors and the harsh environment while maintaining detection accuracy
Solution Approach 2:
The patent introduces an optical field as an intermediary between the sensor system and the physical objects being monitored. The optical sensor detects deck position and obstructions by measuring light interactions (reflection, obstruction) rather than direct physical contact, creating a non-contact measurement interface that protects the sensing system from environmental damage
2Reliability
If the dock leveler operates without comprehensive monitoring, then the system is simpler and faster to deploy, but safety hazards arise from undetected personnel presence and obstructions
Solution Approach 1:
The patent implements a multi-functional optical sensor system that simultaneously performs multiple safety functions: detecting deck position, identifying obstructions, and monitoring personnel presence in the loading area. This single integrated system replaces what would otherwise require multiple separate monitoring devices, achieving comprehensive safety coverage while maintaining relatively simple system architecture
Solution Approach 2:
The patent incorporates real-time feedback mechanisms where optical sensors continuously monitor the loading dock environment and provide immediate data to the control system. The system processes sensor inputs to detect unsafe conditions (personnel in hazard zones, obstructions on deck) and provides feedback signals to prevent dock leveler operation when safety criteria are not met, creating a closed-loop safety control system
3Measurement precision
If touchless optical sensors are implemented to monitor the loading dock, then safety and detection accuracy improve, but the system complexity and cost increase
Solution Approach 1:
The patent divides the optical sensor system into discrete functional modules: light source array, sensor array, signal processing circuits, and control logic. Each module performs a specific function and can be independently optimized or replaced. The sensor array is segmented into multiple detection elements that can be selectively activated based on monitoring requirements, reducing overall system complexity while maintaining high measurement precision
Solution Approach 2:
The patent utilizes variations in optical parameters (light intensity, wavelength, reflection angle) to encode multiple types of information from the loading dock environment. By measuring changes in these optical parameters, the system can distinguish between different objects (deck surface, personnel, obstructions) and determine their positions and characteristics, achieving high detection accuracy through non-contact optical measurement
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
Enhances safety by preventing accidents and optimizing operations by ensuring the dock leveler is only deployed when safe for personnel and equipment, improving the efficiency of cargo handling processes.
Implementation Method 1
an optical sensor having a field of view... to detect a presence of a body on the dock leveler deck
Data Source
AI summary
Methods and apparatus for monitoring a dock leveler are disclosed herein. One example dock leveler system for use at a doorway of a loading dock, where a body is sometimes present at the loading dock, includes a deck movable between a raised position and a lowered position. The example dock leveler system also includes a sensor having a field of view extending over the deck when the deck is in the lowered position. The sensor is in a normal state when the deck is in the lowered position while the body is off the deck, the sensor is in a triggered state when the deck is in the lowered position while the body is on the deck interrupting the field of view, and the sensor is in the triggered state when the deck is in the raised position with the deck interrupting the field of view regardless of whether the body is on or off the deck.