Gyroscope Litter Basket Stabilization Against Hoist-Induced Spin

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Solution Overview

Problem

Helicopter rescue hoist systems face challenges in controlling the spin of patient litter baskets due to ambient wind and rotor downdraft, leading to unpleasant and potentially dangerous conditions for patients and rescue operations.

Innovation Solution

A patient litter basket spin control assembly featuring gyroscopes and a motion sensor that detect angular acceleration, generating counter torque to stabilize the basket, with configurations using one or more pairs of gyroscopes strategically positioned to counteract spinning motions effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a patient litter basket is lowered by a hoist during helicopter rescue, then the patient can be transported to a hospital, but the litter basket may spin uncontrollably due to wind and rotor downdraft

Engineering Contradiction:

Improvestability of litter basketVSAvoidspinning motion from wind and downdraft

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical state of the litter basket by introducing gyroscopic elements that alter the rotational dynamics. The gyroscope modifies the system's angular momentum parameters to resist unwanted spinning motions caused by external forces like wind and rotor downdraft.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The gyroscope acts as an intermediary device between the external disturbing forces (wind, downdraft) and the litter basket. It absorbs and counteracts the spinning torques through gyroscopic precession, protecting the patient from harmful rotational motions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If gyroscopes are added to counteract spinning motion, then stability is improved, but device complexity increases

Engineering Contradiction:

Improvestability of litter basketVSAvoidcomplexity of litter basket assembly

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The stabilization system is segmented into modular components: individual gyroscopes, mounting brackets, power sources, and control units. This segmentation allows for easier installation, maintenance, and replacement without redesigning the entire litter basket system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gyroscope assembly serves multiple functions: it stabilizes the litter basket against spinning, provides structural mounting points, and integrates with existing hoist mechanisms. This multi-functionality reduces the need for additional separate stabilization devices.

Inventive Principle:

Principle #6Universality (Multi-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 solution effectively stabilizes the patient litter basket, reducing angular acceleration and preventing spin-induced sickness and safety hazards during helicopter rescues, ensuring safer transportation of patients.

Implementation Method 1

a first gyroscope mounted to the patient litter basket and configured to counter act the torque of the patient litter basket

Methodology Applied

Scientific EffectGyroscopic effect: Gyroscope

Data Source

PatentEP4180021A1Gyroscope assisted helicopter rescue lift systems and methods

Publication Date: 2023.05.17 HORNET ACQUISITIONCO LLC

Figure 1
Figure 2A
Figure 2B

AI summary

A patient litter basket spin control assembly includes a first gyroscope (351) and a motion sensor (306) for sensing an angular acceleration of a patient litter basket. The first gyroscope generates a counter torque to the litter basket (112) to slow the angular acceleration of the litter basket to provide stabilization. The first gyroscope and a second gyroscope (352) may be configured as a pair and located at opposite ends of the litter basket.