Retractable Truck Catwalk Guide Arm and Actuator
Solution Overview
Problem
Existing catwalks for vehicles and equipment lack a safe and efficient design that allows for easy access and movement between elevated positions while minimizing obstacles and ensuring safety features, particularly in retractable configurations for storage and travel.
Innovation Solution
A catwalk system with a hydraulic or pneumatic actuator system and guide arm system that supports the catwalk in both deployed and retracted positions, preventing accidental retraction when a person is on the catwalk, and maintains a sleek design with no obstructions within the walkway, allowing for easy access between multiple catwalks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the catwalk is made retractable for storage and travel, then the footprint and storage space are minimized, but the complexity of the mechanism increases and safety risks arise from accidental retraction
Solution Approach 1:
The catwalk transitions from a static structure to a dynamic one, capable of moving between deployed and retracted positions. The floor pivots relative to the vehicle body, and the railing pivots relative to the floor, allowing the structure to adapt its configuration based on operational needs versus storage requirements.
Solution Approach 2:
The railing is nested within the space between the floor and the vehicle body when retracted. The guide arm system allows the railing to pivot and nest compactly, minimizing the overall footprint during storage while maintaining structural integrity.
2Ease of operation
If the catwalk is made retractable, then storage convenience is improved, but the reliability and safety against accidental retraction deteriorate
Solution Approach 1:
The guide arm system is designed to prevent the railing from pivoting beyond a certain point, and the actuator system includes controls that prevent retraction when the catwalk is occupied. These preliminary safety measures are built into the mechanism design to prevent accidental retraction before it can occur.
Solution Approach 2:
The system incorporates sensors or detection mechanisms that monitor whether the catwalk is occupied or in a safe position. The actuator control system receives feedback about the catwalk's state and automatically prevents retraction commands from being executed when safety conditions are not met.
3Device complexity
If manual operation is used, then device complexity is reduced, but productivity and ease of operation deteriorate
Solution Approach 1:
A pneumatic or hydraulic actuator system is used to power the deployment and retraction of the catwalk. The actuator converts pneumatic or hydraulic pressure into mechanical motion, enabling rapid and effortless movement of the floor and railing between positions, significantly improving operational speed compared to manual handling.
Solution Approach 2:
The manual mechanical operation is replaced with an automated actuator system controlled by electronic controls or switches. This substitution eliminates the need for manual physical effort while providing precise control over the deployment and retraction processes.
4Strength
If obstructions are added to the walkway for structural support, then strength is improved, but ease of operation and safety deteriorate due to trip hazards
Solution Approach 1:
Instead of placing support structures within the walkway footprint (two-dimensional constraint), the guide arm system and actuator components are positioned in the vertical dimension or along the sides of the walkway. This allows structural support to be provided without obstructing the walking surface, maintaining clear passage and eliminating trip hazards.
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 solution provides safe and efficient access to elevated positions on vehicles and equipment, ensuring user safety by preventing accidental retraction and minimizing the footprint during storage and travel, while maintaining a barrier-free passage between catwalks.
Implementation Method 1
an actuator system for moving the catwalk enclosure between a retracted position/configuration and a deployed position/configuration
Implementation Method 2
a hydraulic or pneumatic actuator system
Data Source
AI summary
A catwalk includes a mounting frame or other connection to a side of a vehicle/equipment, a floor, and at least one railing/railing-portion; an actuator system to move the catwalk enclosure between retracted and deployed positions; and a guide arm for guiding/controlling pivoting of the at least one railing/railing-portion relative to the floor. The actuator system and guide arm are preferably substantially or entirely outside of the catwalk walkway space, for easy movement along the walkway, easy access to the walkway at one or both ends, and obstacle/barrier-free passage from one catwalk to another on the same vehicle/equipment. The actuator system prevents the catwalk from collapsing/retracting when a person is on the catwalk, for example, by the lift capacity of a hydraulic or pneumatic cylinder being controlled/tuned so that the cylinder does not have the capacity/capability to lift and retract the catwalk when the catwalk is occupied.