Modular Electronic Inflator Actuator for Marine Rescue
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Solution Overview
Problem
Existing inflators for life vests and similar marine applications face issues with reliability due to water-sensitive soluble pellets, accidental inflation, bulkiness, and lack of adjustable spring force, leading to mobility problems and inefficiencies in triggering mechanisms.
Innovation Solution
A modular electronic activation system using disc springs and dual moisture sensors, with manual, automatic, and hydrostatic triggering options, allowing for adjustable pressure and depth settings, and a compact design to prevent inadvertent inflation and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If soluble pellets are used as trigger components, then inflation can be activated by water contact, but reliability deteriorates due to water sensitivity, humidity sensitivity, and low temperature sensitivity causing premature or failed activation
Solution Approach 1:
The patent replaces the chemical dissolution mechanism of soluble pellets with an electrical sensing system. Conductive probes detect water contact by completing an electrical circuit, eliminating the reliability issues of soluble pellets while maintaining automatic activation capability. The electrical sensing mechanism is not affected by humidity, temperature, or water quality variations that plague chemical pellets.
Solution Approach 2:
The patent changes the sensing parameter from chemical dissolution (soluble pellet) to electrical conductivity detection. By using conductive probes that detect the presence of water through electrical circuit completion, the system achieves reliable automatic activation without the drawbacks of water-sensitive chemical triggers. This parameter change makes the system immune to humidity and temperature variations.
2Extent of automation
If conductivity-based triggering is used, then automatic inflation is achieved, but false activation occurs due to wet surfaces and unplanned wetting
Solution Approach 1:
The patent applies preliminary anti-action by requiring a sustained water contact condition before activation. The system includes a delay mechanism that prevents immediate activation upon first water contact, allowing temporary wetting from waves or splashes to expire without triggering inflation. Only prolonged submersion that indicates genuine distress activates the inflator, preventing false positives.
Solution Approach 2:
The patent implements preliminary action through a pre-activation sensing phase. Before actual inflation occurs, the system first detects water contact and enters a verification state where additional conditions must be met (sustained contact, depth threshold). This preliminary detection phase distinguishes between accidental wetting and genuine activation needs, preventing premature inflation.
3Force
If compressed coil springs are used to power penetrator motion, then inflation force is sufficient, but device size increases becoming bulky
Solution Approach 1:
The patent employs disc springs with curved, disc-shaped geometry instead of traditional coil springs. The curved profile of disc springs provides high force output in a compact, flat configuration. This curved geometry allows the penetrator mechanism to be powered by thin disc-shaped springs that occupy minimal volume while delivering sufficient piercing force, directly reducing overall device bulk.
Solution Approach 2:
The patent extracts the spring mechanism from its traditional bulky coil form and replaces it with thin disc-shaped springs. By taking out the essential function of spring storage and releasing it through a different geometric form (discs rather than coils), the system achieves the same force output with dramatically reduced volume, eliminating the bulkiness associated with conventional spring mechanisms.
4Power
If higher rating springs are used to increase penetrator power, then inflation force improves, but device complexity and adjustment difficulty increase
Solution Approach 1:
The patent implements dynamic adjustability in the spring mechanism, allowing users to modify spring force settings according to specific application requirements. The disc spring system includes adjustment mechanisms that enable changing spring pre-load or selecting different spring configurations without redesigning the entire device. This dynamic capability provides optimal power for different scenarios (light vs. heavy duty applications) while maintaining manageable device complexity through standardized adjustment procedures.
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 a reliable, compact, and adjustable inflator that can be triggered by manual, moisture, or depth signals, reducing the risk of accidental inflation and enabling precise control over inflation depth, enhancing safety and usability in marine and rescue operations.
Implementation Method 1
at least one disc spring for propelling said penetrator toward said membrane; wherein said at least one disc spring is compressed when said penetrator is restrained by said restraining pin
Implementation Method 2
dual moisture sensors, and adjustable pressure activation
Data Source
AI summary
This invention discloses an inflator mechanism for rafts and life vests that performs a multitude of functions required for rescue and underwater deployment of personnel and devices. The inner cylinder in this disclosure is actuated by a plethora of inputs, manual, automatic selectable pressure sensing, or dualled hydrostatic sensors which can each be safely selected by function selection. Since the inflator uses spring discs to drive a penetrator which mechanically punctures a membrane of an inflation gas source and actuated by an electronically controlled solenoid, dissolvable elements, conductivity switches and preset check valve actuators are eliminated increasing the safety and reliability of the actuator. Electronic control further permits user enabling of inflation depth actuation and the multiple water sensors prevent failure of actuation due to splashes and humidity effects on sensors. The actuator mechanism is self cocking, indicates proper installation of gas source enables use of several gas source cylinders and is multiply reusable.