Retractable Cargo Hook With Torsion-Spring Crash Protection
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Solution Overview
Problem
Existing cargo hooks for aircraft are intrusive and pose challenges in designing safety systems, requiring additional backup structures, risking damage to lanyards and increasing the risk of component damage during crashes.
Innovation Solution
A retractable cargo hook system utilizing a torsion spring to bias the hook towards a preferred orientation, allowing it to retract into a recessed portion of the fuselage and minimizing damage during crashes, and eliminating the need for bungee cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional intrusive cargo hook is used, then the cargo hook can securely hold cargo, but it increases the risk of damage to aircraft components and requires additional backup structures
Solution Approach 1:
The cargo hook is designed to be movable rather than fixed, allowing it to retract into a recessed portion of the aircraft fuselage. The torsion spring enables the hook to dynamically adjust its position between extended (for cargo attachment) and retracted (for safety) states, reducing its intrusiveness while maintaining cargo holding capability.
Solution Approach 2:
The cargo hook system utilizes a recessed portion in the aircraft fuselage where the hook can be nested when not in use. This nesting arrangement allows the hook to be stored within the aircraft structure, minimizing its external presence and reducing the risk of damage to aircraft components during crashes or emergencies.
2Reliability
If a traditional cargo hook with backup structures is used, then safety is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for separate backup structures by integrating the safety function into the retractable mechanism itself. The torsion spring-loaded retraction system serves as both the operational mechanism and the safety feature, simplifying the overall device architecture.
Solution Approach 2:
The retractable cargo hook system performs multiple functions: it secures cargo when extended and provides crash safety when retracted. This multi-functionality eliminates the need for separate backup structures, as the same mechanism serves both operational and safety roles.
3Object-affected harmful factors
If a retractable cargo hook with torsion spring is used, then crash safety is improved, but the device requires more complex machinery
Solution Approach 1:
The torsion spring provides self-powered retraction capability, eliminating the need for external motors, actuators, or complex control systems. The spring automatically recoils the hook into the recessed portion using stored mechanical energy, simplifying the machinery required for retraction while maintaining crash safety functionality.
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 provides safer crash dynamics by controlling the orientation of the cargo hook, reducing the risk of damage to aircraft components and passengers, and enabling weight savings through a smaller footprint and targeted protection mechanisms.
Implementation Method 1
an arm portion comprising a torsion spring configured to rotatably couple the cargo hook about an axis
Data Source
AI summary
A retractable cargo hook for aircraft is described. The cargo hook including a torsion spring allowing rotatable attachment to an aircraft body. An optional recessed portion of the aircraft body can house and receive the cargo hook. This can protect interior components from crashes which can push the cargo hook into the aircraft fuselage, damaging components.