Dual-Action Inflator Actuator for Emergency Floats and Rafts

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Solution Overview

Problem

Existing actuators for inflating emergency flotation devices on aircraft, such as helicopters, are prone to inadvertent activation due to the need for single-action handles, which can lead to premature inflation and potential injury or interference with aircraft controls.

Innovation Solution

The actuator design requires two opposite actions: a pulling motion to inflate floats and a pushing motion to inflate rafts, ensuring that raft inflation occurs only after float inflation has begun, thereby reducing the risk of premature activation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a single-action handle is used for inflation, then the ease of operation is improved, but the reliability deteriorates due to inadvertent activation

Engineering Contradiction:

Improveease of activationVSAvoidrisk of inadvertent activation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The single inflation action is segmented into two distinct opposite actions: a pulling motion to inflate floats and a pushing motion to inflate rafts. This segmentation prevents inadvertent activation because accidental forces are unlikely to produce the specific two-stage opposite motion sequence required for raft inflation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The actuator requires opposite actions (pulling then pushing) rather than a single directional action. This inversion of the conventional single-direction actuation mechanism creates a more reliable system where accidental activation is prevented, as unintended forces rarely produce the required opposite motion sequence.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If multiple handles are provided for inflation from different locations, then the adaptability is improved, but the reliability deteriorates due to increased likelihood of premature inflation

Engineering Contradiction:

Improvenumber of activation locationsVSAvoidlikelihood of premature inflation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A single actuator mechanism performs multiple functions: it can inflate both floats and rafts, and it can be actuated from multiple locations via the flight controls. The dual-action requirement (pulling and pushing) applies universally to all activation locations, maintaining reliability while providing versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The same actuator mechanism is used for both float and raft inflation, requiring opposite actions for different functions. This universal mechanism with inverted action requirements prevents premature activation while allowing activation from multiple locations through the flight control system.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If a breakaway wire is used to prevent inadvertent activation, then the reliability is improved, but the device complexity increases

Engineering Contradiction:

Improveprotection against inadvertent activationVSAvoidactuator mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of adding a breakaway wire to a simple handle, the invention inverts the approach by making the handle itself require a complex dual-action sequence. The pulling and pushing motions are built into the handle's operation, eliminating the need for additional protective components like breakaway wires while maintaining reliability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The protective function previously requiring a separate breakaway wire is merged into the handle mechanism itself. The dual-action requirement is integrated into the basic operation of the handle, combining the activation function and the protection function into a single unified mechanism.

Inventive Principle:

Principle #5Merging (Combining)

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

This dual-action mechanism effectively inhibits inadvertent deployment of the flotation devices, ensuring safe and deliberate activation during emergency situations, reducing the risk of injury or system interference.

Implementation Method 1

movement of a spring-loaded detent so as to align a bearing surface with a second piercing mechanism

Methodology Applied

Scientific EffectSpring-loaded detent mechanism: Spring

Data Source

PatentUS8794484B2Actuators principally for inflatable systems

Publication Date: 2014.08.05 AIR CRUISERS COMPANY LLC

AI summary

Actuators, principally for inflating emergency-usage objects such as floats and rafts, are detailed. Two opposite positive actions may be required to effect complete inflation of the objects, inhibiting inadvertent deployment of, particularly, the rafts while readily permitting deployment when intended.