Water-Activated Inflatable Flotation Device with LED Illumination
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Solution Overview
Problem
Existing devices for making items float in water, such as keys and mobile phones, are either too bulky, unsafe, unreliable, or expensive due to their reliance on flammable gases or complex mechanisms like compressed carbon dioxide and water-degradable materials.
Innovation Solution
A cost-effective and reliable flotation device using a hydrogenated chlorofluorocarbon gas in a plastic container, with a water-reactive band to release pressure and prevent airlocks, and an LED illumination system for visibility, attached via a clip or O-ring for easy retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cork devices are used to make items float, then items can be retrieved from water, but the devices are bulky and not sufficiently buoyant for heavy items
Solution Approach 1:
The patent changes the physical parameters of the flotation device by using an inflatable bag structure that transitions from a compact deflated state to a large inflated state. The bag expands to provide sufficient buoyancy (1.5 litres when inflated) while maintaining a small volume when not in use. This parameter change allows the device to achieve reliable buoyancy for heavy items without occupying excessive space during storage.
Solution Approach 2:
The flotation device transitions from a static cork structure to a dynamic inflatable bag that can change its volume and buoyancy characteristics. The bag is automatically inflated upon contact with water through a valve mechanism, allowing the device to adapt its buoyant properties based on environmental conditions. This dynamic behavior enables the device to provide reliable flotation only when needed, resolving the contradiction between buoyancy reliability and device volume.
2Reliability
If acetylene gas is generated by calcium carbide and water reaction, then the bag inflates to provide flotation, but the device becomes unsafe due to flammability
Solution Approach 1:
The patent changes the chemical parameter by replacing flammable acetylene gas with inert carbon dioxide gas as the inflation medium. This substitution eliminates the fire hazard while maintaining the inflation capability. The carbon dioxide is stored in a pressurized canister and released through a water-activated valve mechanism, providing reliable flotation without the harmful flammability associated with acetylene.
Solution Approach 2:
The patent employs a disposable water-reactive material (such as magnesium or aluminum powder) that reacts with water to generate pressure and open the valve. This consumable component is designed to be used once and then discarded, eliminating the need for complex reusable mechanisms. The reaction provides sufficient pressure to inflate the bag and release carbon dioxide, achieving reliable flotation capability while using simple, safe materials that pose no fire hazard.
3Reliability
If a canister of compressed carbon dioxide with a trigger device is used, then the bag inflates reliably, but the device becomes expensive to produce and complex in structure
Solution Approach 1:
The patent extracts the complex trigger mechanism from the canister system and replaces it with a simple water-reactive material that directly generates pressure to open the valve. The water-reactive material (magnesium or aluminum powder) reacts with water to produce hydrogen gas and heat, creating sufficient pressure to rupture a seal or open a valve on the carbon dioxide canister. This extraction of the complex mechanical trigger simplifies the overall device structure while maintaining reliable inflation capability.
Solution Approach 2:
The patent uses pneumatic pressure generated by the water-reactive material to activate the inflation mechanism. The chemical reaction between the reactive material and water produces gas and heat, creating pressure that automatically opens the valve or ruptures the seal on the carbon dioxide canister. This pneumatic activation method eliminates the need for complex mechanical triggers, buttons, or switches, simplifying the device while ensuring reliable inflation when water contact occurs.
4Ease of operation
If water-degradable material is used to trigger inflation, then the device can be activated by water contact, but air locks frequently occur in the water passage
Solution Approach 1:
The patent applies preliminary action by pre-positioning multiple apertures in specific locations on the casing to ensure water can reach the water-reactive material regardless of the device's orientation in water. The apertures are strategically placed so that at least one will be submerged and allow water ingress under any reasonable orientation. This preliminary arrangement of apertures prevents air locks by ensuring water has multiple potential entry paths to the reactive material, eliminating the reliability issue associated with single-point water activation.
Solution Approach 2:
The patent segments the water activation system by providing multiple separate apertures rather than a single water entry point. This segmentation ensures that if one aperture is blocked by air or oriented away from water, other apertures can still allow water to reach the reactive material. The water-reactive material itself is also segmented into multiple particles or layers, increasing the probability that at least some will be in contact with water. This segmentation approach eliminates air lock problems by providing redundant water access paths.
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 device provides a safe, efficient, and cost-effective means to inflate a buoyant bag that can support up to 1 kg of weight, with the LED ensuring visibility in low light conditions, and can be scaled for heavier items by using multiple units or larger designs.
Implementation Method 1
the retainer means comprises at least one water reactive band (strip) of material which dissolves upon contact with water thereby releasing the valve
Implementation Method 2
a container of compressed gas in communication with the interior of the bag through a valve
Implementation Method 3
an illumination device comprising a light emitting diode (LED) and a battery power source
Data Source
Figure 1~3
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Figure 7
AI summary
A device which will act efficiently as a float for any article (e.g. keys, mobile telephone, wallet) attached thereto when dropped into water comprises an inflatable bag (14') of substantially waterproof and air impervious material, a container (12) of compressed gas, and trigger means (16,30,32) associated with the container (12) and operable upon immersion of the device in water to open the container (12) and allow gas from the container (14') to inflate the bag (14). The trigger means comprises a valve (16) mounted on the container (12) and connecting the container to the inflatable bag (14'), retainer means (64) operative to hold the valve (16) in a closed condition, and water reactive means (66) which, upon contact with water, serves to release the retainer means (64) and allow the valve to open, e.g. under spring bias. The water reactive means may comprise a band of material (66), at least part of which is water reactive. The bag (14'), the container (12) and the trigger means are housed in a casing (10) and means (37) are provided, preferably integrally on the container (12), for attachment of the device to another article. An illumination device (50) is mounted inside the inflatable bag (14'). This preferably includes a light emitting diode (LED) (52) powered by at least one battery (54), the latter being automatically connected to the LED upon inflation of the bag by withdrawal of an intervening strip of insulating material.