Attenuated Cargo Caster Pivot Assembly Dynamics
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Solution Overview
Problem
Existing cargo loading and unloading systems face challenges in controlling unwanted movement of Unit Load Devices (ULDs) during loading and unloading, which can lead to safety risks and damage to the aircraft and cargo, due to the height requirement of braking mechanisms that can cause damage to ULDs or the aircraft.
Innovation Solution
An attenuated caster system with a pivot assembly, spring, and brake assembly is designed to control the movement of ULDs by distributing the load and allowing controlled descent of the brake assembly below the conveyor plane, minimizing damage and ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotating element of the braking caster is elevated above the conveyor plane to provide sufficient cargo contact and normal force for braking, then the braking effectiveness is improved, but the risk of damage to the ULD or aircraft increases
Solution Approach 1:
The caster assembly is made dynamically adjustable through a telescopic mechanism that allows the rotating element's height to be changed from an elevated position (for effective braking) to a retracted position (below the conveyor plane) to prevent damage. This dynamic adjustment resolves the contradiction by allowing the system to optimize braking effectiveness when needed while minimizing damage risk during other operations.
Solution Approach 2:
The height parameter of the rotating element is made variable through the telescopic adjustment mechanism. By changing the vertical position parameter of the rotating element between two extreme positions (elevated for braking, retracted for safety), the system can adapt to different operational requirements and resolve the contradiction between braking effectiveness and damage prevention.
2Reliability
If a braking mechanism is installed to control unwanted movement of ULDs during loading and unloading, then the safety of loaders and aircraft is improved, but the complexity of the cargo handling system increases
Solution Approach 1:
The braking function is merged with the existing caster wheel assembly rather than being implemented as a separate braking mechanism. The rotating element of the caster serves dual purposes: facilitating movement during loading/unloading and providing braking when elevated. This integration reduces system complexity while maintaining safety benefits.
Solution Approach 2:
The caster assembly is designed with multi-functionality, serving both as a movement facilitation device and a braking mechanism. The same rotating element that enables easy movement of ULDs during loading and unloading is also used for braking when elevated, eliminating the need for separate braking components and reducing overall system complexity.
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 attenuated caster effectively limits ULD movement while distributing the load to other components, reducing the risk of damage to the aircraft and cargo, and ensuring safe handling during loading and unloading processes.
Implementation Method 1
at least one spring can be on the second end of the pivot assembly
Implementation Method 2
The wall of the pivot assembly can be rotatably linked to the wall of the housing
Implementation Method 3
The rotating element of the braking caster is configured to slow and stop a ULD
Data Source
AI summary
A caster for use in aircraft along a cargo deck comprises a housing having at least one wall, a pivot assembly, a brake assembly and at least one spring. A pivot assembly can have at least one wall, first and second ends, and a base between the first and second ends, wherein the first end of the pivot assembly can be elevated above the second end of the pivot assembly. The wall of the pivot assembly can be rotatably linked to the wall of the housing. An optional brake assembly can be on the first end of the pivot assembly. At least one spring can be on the second end of the pivot assembly. A cover on or above the at least one spring can be secured to the wall of the housing.