Depth-Activated Flotation Device Using Compressible Gas Valve
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Solution Overview
Problem
Existing wearable flotation devices either interfere with swimming and diving by providing constant buoyancy or require manual activation, which may not provide adequate protection against drowning, especially for individuals who cannot activate them in time.
Innovation Solution
A wearable personal flotation device that automatically deploys a buoyant member upon reaching a certain depth below the water's surface, using a compressible member to block gas flow until sufficient water pressure compresses it, allowing inflation of an inflatable member without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wearable flotation device provides constant buoyancy, then drowning prevention is improved, but interference with swimming and diving activities increases
Solution Approach 1:
The flotation device transitions from a static constant-buoyancy state to a dynamic depth-activated state. The device remains inactive at surface level (allowing free movement) and automatically activates buoyancy when submerged beyond a predetermined depth (providing drowning prevention), thus resolving the contradiction between constant protection and activity freedom
Solution Approach 2:
The device changes its buoyancy parameter based on depth pressure. At surface level, the buoyant member remains deflated (zero buoyancy), allowing normal swimming and diving. When pressure from submersion exceeds a threshold, the buoyant member inflates (providing buoyancy), ensuring drowning prevention. This parameter change resolves the contradiction between constant protection and activity capability
2Ease of operation
If a wearable flotation device requires manual activation, then ease of operation is improved, but reliability of drowning prevention deteriorates
Solution Approach 1:
The device performs self-activation based on depth detection. When the wearer submerges beyond the predetermined depth, the pressure-activated mechanism automatically inflates the buoyant member without requiring manual intervention. This self-service capability ensures reliable drowning prevention even when the wearer is incapacitated, while maintaining simplicity in operation
Solution Approach 2:
The patent replaces manual mechanical activation (button pressing, pulling cords) with an automatic pressure-activated mechanism. The depth-sensitive pressure sensor or pressure-activated valve detects submersion and triggers buoyancy deployment automatically, eliminating the need for manual operation while ensuring reliable protection
3Reliability
If a wearable flotation device automatically deploys at predetermined depth, then drowning prevention reliability is improved, but device complexity increases
Solution Approach 1:
The device uses pneumatic pressure from water submersion to trigger automatic deployment. The pressure-activated valve or diaphragm mechanism utilizes water pressure directly to inflate the buoyant member, eliminating the need for complex electronic sensors, batteries, or control systems. This pneumatic approach achieves reliable automatic activation while keeping the mechanism simple and robust
Solution Approach 2:
The buoyant member undergoes a phase transition from deflated (non-buoyant) to inflated (buoyant) state based on depth pressure. This binary phase change provides clear, reliable activation without requiring complex control mechanisms. The pressure-activated trigger initiates gas flow that causes the abrupt transition from non-buoyant to buoyant, achieving reliable automatic protection with minimal 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
Enables individuals to swim and dive without interference while providing automatic buoyancy only when needed, enhancing protection against drowning by deploying buoyancy at a predetermined depth without user activation.
Implementation Method 1
when the personal flotation device is subjected to greater than or equal to the predetermined water pressure, the compressible member compresses and thereby allows compressed gas from the canister to inflate the inflatable member
Implementation Method 2
a canister disposed within the housing and storing a compressed gas... allows the compressed gas from the canister to inflate the inflatable member
Data Source
AI summary
A personal flotation device is provided that includes a housing, a canister disposed within the housing and storing a compressed gas, an inflatable member coupled to the housing, a channel within the housing, and a compressible member positioned within the channel. The channel extends from an exit point of the canister to the inflatable member such that the canister can be in fluid communication with the inflatable member. The compressible member is configured such that (i) when the personal flotation device is located less than a predetermined depth below a surface of water, the compressible member prevents the compressed gas from the canister from reaching the inflatable member, and (ii) when the personal flotation device is located greater than or equal to the predetermined depth below the surface of water, the compressible member compresses and thereby allows the compressed gas from the canister to inflate the inflatable member.