FIELD OF THE INVENTION

The present invention relates to an inflation device for a lifejacket.

BACKGROUND OF THE INVENTION

Lifejackets are compulsory in many situations where a person may end up in the water, and require assistance to keep afloat and buoyant. Technology has advanced from simple inflatable jackets to the more complex lifejackets with self-inflation on contact with water. For people working on a fishing vessel, or children travelling on a boat, these self-inflating life jackets work well as they are required to inflate if the person enters the water. The automatic inflation occurs rapidly so that the comfortable jacket quickly becomes a life- saving lifejacket once the device is in contact with water. However, there are a great many circumstances where these self-inflating life-jackets would be useful, but cannot be worn, as the person needs to contact the water and may get wet for at least a short time, to carry out the activity. For example, in white water rafting, sailing or outrigger canoeing there is significant spray and splash of water, and the person may jump in and out of the water during the activity. These voluntary actions involving contact with the water do not need inflation of the life-jacket, as at that point the person is safe, but as the person will contact the water the water activated lifejacket is not an option.

Manual inflation devices could be used in this situation, but need the person to be conscious and so their use can also be limiting in an emergency. If the person is knocked unconscious and is in the water the manual inflation will not occur as the person is unable to act, to save themselves. In an ideal world the person would wear the lifejacket from before the start of the water activity until safe back on dry land, and this would may include episodes in the water. Further, in the case of an emergency such as the person being under the water for some time, or getting into difficulties in the water, the inflation would then operate to inflate the lifejacket and to bring the person to the surface. Therefore, the present invention that will automatically inflate the lifejacket, but only after a predetermined time or sensor condition indicates something outside of the usual contact with the water. In this way use of the invention may be used, with all its added benefits, including for the usual use of water contact sports and activities. The inventors have designed a significant advance over the prior art, an automatic inflation apparatus for lifejackets that can be worn during water sports. The inflation apparatus uses a unique inflation device, operated by a sensor, timer and low current, which in turn releases a force to pierce the CO2 canister so the gas may inflate the lifejacket.

The following describes a non-limiting example of the invention being used with reference to a lifejacket used in water sports, where other auto-inflation devices are not suitable. However, the clever new inflation mechanism of the subject invention is one that could be useful in a great many other applications. It is not intended to limit the use or scope of the inflation apparatus to use with lifejackets, other than as limited in the claims. Further, the activation device itself is not in any way limited to use for inflation, other than as limited by the claims, as it is suitable for a great many useful applications. The activation method and inflation device can be useful in a great many applications.

For clarity, any prior art referred to herein, does not constitute an admission that the prior art forms part of the common general knowledge, in Australia or elsewhere.

It is an object of the present invention to provide an inflation device that at least ameliorates one or more of the aforementioned problems of the prior art. It is a further and separate object of the present invention to provide an inflation apparatus that at least ameliorates one or more of the aforementioned problems of the prior art. It is a further and separate object of the invention to provide a method of use that at least ameliorates one or more of the aforementioned problems of the prior art.

DISCLOSURE OF THE INVENTION

The invention, in a broad aspect provides an inflation device for an improved inflation apparatus for a lifejacket.

Accordingly, the invention provides an inflation device for inflation apparatus for lifejackets, the inflation device including:

a wire means that heats on connection to a power supply;

one or more change part that will change from a first state to a second state on action of the heat of the wire means; and a spring, movable between a coiled compressed state to a sprung state on changing of the change part or parts to the second state,

wherein on providing power from the power supply to the wire means, the wire means heats, which in turn heats at least part of the change part, causing the change from the first state where the spring is in the coiled, compressed state, to the second state, where the spring can uncoil into the sprung state, and the action of the sprung spring on the inflation apparatus leads to inflation of the lifejacket.

The inflation device is preferably, a device suitable to cause inflation of inflation apparatus for a lifejacket. The lifejacket and inflation apparatus may be of a known form used with the inventive inflation device. The inflation apparatus may include a gas cylinder. The inflation apparatus may include an inflation chamber sealably attached to the gas cylinder. The lifejacket may be attached to the inflation chamber. Preferably, a one way valve is included between the inflation chamber and the lifejacket. Preferably, when gas fills the inflation chamber and the pressure overcomes the one-way valve the lifejacket inflates, in the usual manner. The inflation apparatus may be varied to suit the particular apparatus.

The wire means can be any suitable means. The wire means may be any suitable wire or metal piece. Preferably, the wire means is a long piece of wire. The long piece of wire may be bent or folded. Preferably, the wire means is any wire that can be caused to heat by application of an electrical charge. A metal wire is particularly useful, but the invention is not limited to this use.

Preferably, the wire means is a high resistance wire. The wire means preferably heats on application of electrical charge, but does not melt or deform. The wire means preferably heats, and the heat causes the or each change part in close proximity to change and the change releases the spring. Preferably, the heat of the wire means to at least some extent “melts” part of at least one change part, enabling release. The change to the or each change part may involve any form of deformation in response to the heat, including melting, breaking apart or otherwise changing shape. The wire may be a Nichrome wire, or similar. Most preferably, the wire means is suitable that a low charge or current will heat the wire means and enable change in the or each change part, such as through melting, deforming or breaking apart. The or each change part may be changed by any suitable mechanism. The change part may break, separate, deform, melt or burn, for example, or any combination thereof. Preferably, the change part changes through use of the wire means. Preferably, heat is used to cause change in the change part. Preferably, the heating causes one or more parts to melt. The heat could in other forms cause deformation, burning or any other change induced by heat. In alternative forms of the invention heat is not used, but other forms of change are caused in the change part to release the spring.

Preferably, the wire means heats, and the heat melts at least part of one change part, whereby the change part releases the spring to cause piercing of the CO2 canister to inflate the lifejacket. The heating can lead to any suitable transformation to enable the change part to be released. Most preferably, a low or very low current or charge is sufficient to heat the wire means and cause a deformation and change in the change part. Most preferably, low current is used to heat the wire means and activate the inflation device and hence inflate the attached lifejacket. The wire means may be a flattened piece of wire to fit between parts. The wire means may act directly to transfer heat from the wire means to one or more change part.

The connection to the power supply may be any suitable connection. Most preferably, the connection to a power supply is such that on operation an electrical connection is caused, to cause heating of the wire means, and the heat leads to the deformation of the change part to release the spring means. Preferably, the power supply is a portable power supply. Preferably, the power supply is one or more battery. Preferably, the electrical charge is a small charge. Preferably, only a low or small electrical charge is required to operate the apparatus through the device. Preferably, a very small charge or current is used and the wire means heats on this small charge or current leading to changes in the change part and inflation of the lifejacket.

The change part or parts may take any suitable form. There may be several parts which together form the change part. The changes parts may be the same of different to one another. Preferably, application of heat enables the change part or parts to change, to release the spring means. Preferably, the change part includes one or parts that can move or break-up which enables release of the spring means. Preferably, the low charge is all that is needed to enable the heating of the wire means to enable the change part or parts to change. The heating of the wire means leading to melting of part of the or each change part is a particularly beneficial form of the invention, as the strong hold on the spring is readily released with only a small current required.

The shaping of the change parts can be varied within the scope of the invention, as would be understood. However, preferably, a change part is includes substantially in ring form. The ring form may surround a peg of a base, or part of a base itself. More than one substantially ring shaped change parts may be included. Preferably, a pair of change parts are included. Preferably, the pair of change parts work together to maintain the spring in place until the heat from the wire means causes deformation and the deformation releases the spring.

In one form of the invention the change parts are substantially cylindrical in shape. Preferably, in this form of the invention there are a pair of corresponding change parts. Preferably, the pair of corresponding change parts nest within one another. Preferably, the pair of corresponding change parts nest within one another and the wire means lies between them. Preferably, the wire means is sandwiched between the change parts such that on heating the heating is directly acting on the change parts.

The change parts may include shaping or tapering. Preferably, shaping or tapering is included in one or more change part to assist to maintain the change part and the spring in compressed until released. Shaping may be included on the change parts to help to hold together. Shaping may be included in the change parts to assist to hold together.

Preferably, wherein the shaping or tapering is included to assist to hold the spring in the compressed state and the tapering assists rapid deformation on heating so that the change part changes and releases the spring. The tapering or shaping may be varied in different forms of the invention. The change parts may be as 40 and 42 of the drawings. The change parts may be as parts 140 and 142 of the drawings, in another form of the invention.

Preferably, the spring means enables a strong action to cause operation of an apparatus, between the first state and the second state on heating of the wire means. Most preferably, the spring means moves powerfully to cause action, such that the gas can be released from the cylinder to inflate the lifejacket. Most preferably, the spring means moves forcefully from compressed to sprung, which enables a forceful change to occur.

The spring means may take any suitable form. Preferably, the spring means is under tension and on release the tending of the spring towards the CO2 canister will cause part of the spring to be forced toward the seal of the CO2 canister, puncturing it to enable inflation of the lifejacket.

Preferably, the spring includes a coil, held in place under tension. Preferably, a mounting plate is included between the spring and the or each change part and the mounting plate attaches the inflation device to the housing. Most preferably, the inflation device includes a wire means, change parts, mounting plate, coiled spring and base plate with peg. The arrangement of base plate and peg, with coiled spring compressed and held by a mounting plate is particular suitable and useful. Variants can be made to the form. The base plate may double as the impact point to be fired from the inflation device to puncture the frangible seal of the gas cylinder of the lifejacket inflation apparatus. Preferably, the change parts are temporarily attached to the peg of the base plate through corresponding parts. Preferably, the temporary attachment is released through deformation or change of the change parts in response to the wire means heating. The change parts and the temporary attachments may be adapted to the corresponding peg. Preferably, these parts are compressed and held tightly together in the“off” state and when turned on the wire means heats the change parts which deform, the part shifts under the pressure of the spring and then the whole spring is forcefully released towards the CO2 canister to enable inflation. Preferably, the inflation device is adapted to strongly tend towards a frangible opening of the CO2 canister which on puncturing causes gas to fill the waterproof chamber until the pressures is sufficient to pass through a valve and fill the lifejacket.

Preferably, the inflation is automatic inflation. For example, submersion may lead to inflation after a predetermined time. In other circumstances manual operation may be required for inflation to occur, as an override. Preferably, the inflation is the inflation of a connected lifejacket. The inflation may take any suitable form. The inflation may be through use of gas inflation. The inflation may be through use of CO2 gas inflation of a lifejacket. The inflation apparatus could be used to trigger other forms of inflation, not limited to use of gas. Most preferably, however, use of the inflation device of the inflation apparatus triggers release of CO2 gas such that the lifejacket rapidly inflates for use. Most preferably, the inflation device acts strongly from a first state to a second state to cause piercing of a frangible cover on the of CO2 gas causing filling of the lifejacket.

The invention device may be used with an inflation apparatus for a lifejacket, including a body and electronics to control and power the inflation device. The power is a removable battery and the apparatus may be provided with our without the battery. Further, the inflation apparatus is used with a CO2 gas canister which may be supplied with the apparatus or supplied separately. Each of the inflation device, or inflation apparatus including the inflation device may also be supplied separately. In another form the inflation apparatus will be supplied with the CO2 gas canister and may also be supplied with the lifejacket itself as a complete system. The inflation described would usually be filling with a gas lighter than water so that the person wearing the lifejacket will be maintained on the water surface, awaiting rescue.

The inflation apparatus or inflation device may be supplied with the lifejacket, ready for use. The lifejacket may be any suitable lifejacket that may be inflated through use of gas. The lifejacket may be of the kind similar to a Marlin Australia inflatable lifejacket fitted with a UML (Trade Mark, United Moulders Ltd UK) inflation apparatus.

The inflation apparatus or inflation device may be used for any suitable application. Preferably, the inflation apparatus is used for water sports where the person may enter the water voluntarily and not wish the lifejacket to inflate on contact with water. Preferably, the inflation apparatus may be used in activities in the water and the inflation device will only inflate in an emergency. Most preferably, the device only activates after a predetermined time or sensor condition. Preferably, only after a set time in the water will the device activate to operate the lifejacket. The apparatus may also be used to only inflate on manual activation, as an override for use by the wearer.

The body may take any suitable form or shape. Preferably, the body is waterproof. Preferably, the body includes a waterproof chamber. The inflation chamber of a lifejacket may take the place of the body is some forms of the invention. Preferably, it is to the water proof chamber that the CO2 gas canister is connected and the inflation device also associated for release of the gas on operation. Preferably, the CO2 gas canister is connected to a UML (Trade Mark) lifejacket inflation apparatus and it is through use of the inventive activation device that the UML (Trade Mark) lifejacket inflation apparatus is operated. The body may be part of the UML (Trade Mark) lifejacket inflation apparatus. The body may be a separate part in other forms of the invention. Preferably, the body is made substantially of a hard plastics material. Preferably, the body is substantially cuboid in shape, and may include rounded edges for convenience. Any shape may be used for the waterproof chamber. Preferably, the waterproof chamber is connected to the CO2 gas canister, the life jacket and to the inflation device. Preferably, a screw fit is used to connect the CO2 gas canister to the body during assembly through use of corresponding threaded and receiving parts. Other strong connections could be used instead. Preferably, the chamber includes connections to the inflation device, lifejacket and means of inflation and it is through the action of the inflation device through the chamber on the means of inflation that causes the inflation of the lifejacket. Other shapes and arrangements of the body may be used instead.

The body may include housing for the electronics arrangement or be connected thereto. The body may house all the components of the inflation apparatus. The body may connect all the components of the inflation apparatus. The body may connect to the gas supply, lifejacket, and inflation device, conveniently. The body may connect to the electronics arrangement and together form a body of the inflation apparatus. The body is minimised in the example given, to make a lightweight arrangement. In other forms a box or full container may be used instead to contain all or most of the components instead. A valve arrangement is preferably included, between the inflation apparatus and the lifejacket to control flow of gas. Preferably, the valve will only open to allow gas to pass from the inflation chamber within the body to the lifejacket when there is sufficient pressure. Preferably, the valve is a one-way valve system to prevent deflation of the lifejacket. Any suitable valve arrangement may be used between the inflation device and the life jacket. Preferably, the lifejacket is attached to the inflation apparatus via a suitable valve arrangement. Preferably, the valve arrangement is positioned on the body. Preferably, a sensor is included. Preferably, the sensor is used to detect contact with water. Preferably, the sensor is included to detect prolonged exposure to water. The sensor may include a timer and the contact time with the water can be set by the user whereby if the sensor is exposed to water for the set time the activation occurs, which leads to the inflation of the device. A separate timer may be included. The timer and the sensor preferably are in communication with the microprocessor.

Preferably, the sensor is pressure sensor. The sensor may be a pressure sensor that detects contact with water by the change in pressure. The change in pressure for more time that a set time may cause activation. The internal and external pressure may be measured. A timer may be included, and the inflation occur after a predetermined time. The sensor condition may start the timer and after a predetermined time cause inflation of the device. In this way the apparatus may be used for inflation devices for water sports, as a short contact with water will not cause activation of the inflation. However, should the sensor be in contact with water for more time than usual use, as predetermined, the activation will be caused to inflate the lifejacket. In this way the inflation will only be activated if there is a significant water event, a dangerous situation where the person is in the water for a prolonged length of time. The activation will occur whether a person is conscious or conscious as the inflation is automatic.

The invention is far more sophisticated than existing systems as it will only occur when really needed, and on extended contact with the water. The pressure sensor may be included for detection of the person being under the water and in distress. Preferably, the pressure sensor on detection of abnormal pressure operates the inflation apparatus to inflate the lifejacket automatically. Preferably, the pressures sensor may be found on the outside of the waterproof chamber. The pressure sensor may detect that the person is in deep water. The pressure sensor may detect that the person is in the water and a timer starts once the sensor detects water. Once the timer starts it may run a predetermined time while the sensor continues to detect water, and if there is no change the inflation will be activated at the end of the predetermined time. The sensor may detect pressure and depth of water whereby the activation does not occur unless water pressure is detected. There may be a timer included with the sensor. Preferably, the timer works with the sensor and so activation only occurs when the sensor detects a condition for a predetermined time. Preferably, the timer is set to recognised sensor conditions that should activate the lifejacket. The timer may detect a greater than 15 second exposure to the predetermined water pressure. Adjustments may be made, for children, for example. Other ranges can also be used. Most preferably, the sensor with detect where the person has been at a depth of 1 meter of water or greater for 15 seconds. The sensor may cause the current to flow to the wire means once particular predetermined conditions are detected. Once certain sensor conditions have been detected or established as a danger detected situation, the lifejacket will be inflated. Suitable microprocessor circuits and controls may be included to control between the sensor and the wire means.

Preferably, the electronics arrangement is contained in a waterproof housing. The waterproof housing may be part of the body. A separate waterproof housing may be used for the electronics, which may be connected to the body in use. Preferably, the electronics arrangement includes a housing, power supply and operation means to control the inflation device and these are kept dry by the housing. A lid may be included in the housing to enable inspection and replacement of the power supply, for example. Most preferably, the body and housing connect together to form a waterproof connection with the other parts, the gas canister and lifejacket.

Preferably, a screw fit is used to connect the electronics housing to the body during assembly through use of corresponding threaded and receiving parts. Other strong connections could be used instead. Preferably, the waterproof chamber of the body is connected securely to the electronics housing such that operation of the inflation device can act within the chamber. Most preferably, the electronics arrangement is a component attached to the waterproof chamber through a screw fit and the CO2 canister is likewise attached to the waterproof chamber with a screw fit, to make a strong attachment.

The electronic arrangement may include any suitable components to power, control and operate the inflation device. Other components may be included as required. Additional functions of the inflation apparatus may be included operable through use of the electronics arrangement. Preferably, the electronics arrangement is housed in a waterproof housing and contains a power supply, and microprocessor controls operable by the user, through use and the inflation device. The power supply may take any suitable form. Preferably, the power supply is one or more battery. Preferably, the power supply is one or more lithium-ion battery. Nickel metal hydride batteries may be used instead. Other batteries may also be found to be suitable. Preferably, the power supply is connected so that on operation of the operation means the inflation device causes inflation. The connection may be through a circuit including the power supply, operation means and inflation device in the usual fashion. Preferably, the“on” state is caused through activation of the sensor after the timer has run for the predetermined time. Any switch or mechanism could be used instead. In this form of the invention, once the sensor and timer reach the predetermined conditions, operation means is activated from the“off” to the“on” state. Preferably, a circuit is completed so that power is then supplied to the inflation device. Preferably, the“off” state is one where the inflation device is not activated and the lifejacket is not inflated. The inflation device and inflation apparatus will remain in the“off” state most of the time, and only be in the“on” state in the case of an emergency or need for inflation. The“on” state is one where the lifejacket needs to be inflated and so operation takes place to provide power to the inflation device. Preferably, the“on” state achieves the inflation of the lifejacket. After use the inflation device may be resent and the gas cylinder replaced to enable the other components to be reused. In other forms the inflation apparatus may instead be single use.

Any suitable CO2 canister may be used. Preferably, the CO2 canister used is exactly the right size to properly fill the lifejacket. Preferably, the canister releases all the gas into the lifejacket on puncturing. Preferably, the canister has a covering that is easily punctured to release the gas on use of the inflation device. Preferably, the spring is tended so on release strongly contacts a frangible covering, punctures it and releases the gas for inflation.

Preferably, in the inflation form of the invention, the inflation device is adapted to strongly tend towards a lifejacket inflator, which in turn punctures a CO2 canister and on puncturing causes gas to pass through the lifejacket inflator and inflate a lifejacket.

Accordingly, the invention relates to an activation device for activation of apparatus, the activation device including:

a wire means that will heat on connection to a power supply; a change part that will change from a first state to a second state on action of the heating of the wire means; and

a spring means, movable between from coiled compressed state to a sprung state on changing of the change part to the second state,

wherein on providing power from the power supply to the wire means, the wire means heats and in turn heats or melts the change part from the first state where the spring means is in the coiled, compressed state, to the second state, where the spring means can uncoil into the sprung state, to cause activation of the apparatus.

Preferably, the first state is a non-activated state of the apparatus. Preferably, the second state is the activated state where the spring means is released. The activation and second state can be any suitable operation. Preferably, the activation causes the inflation or operation of safety equipment. The activation may be the inflation of the lifejacket, through piercing of a CO2 cylinder, for example.

The activation may be any suitable activation. The activation of the inflation device may be used for any suitable application. The invention has a great many useful applications. The inflation may be the inflation of a life jacket. The inflation may be the inflation of any apparatus from an uninflated state to an inflated state. The usual inflation may be use of gas, but it is not intended to the limit the invention in this manner, any suitable change of state may be used. Most preferably, the inflation is from an uninflated state to an inflated state suitable to float in water. The inflation may be through use of CO2 gas to inflate a closed body. The inflation apparatus may then be used for safety in water to stay afloat, as would be readily understand. The activation means may have any one or more features of the inflation device.

Accordingly, the present invention provides in one form, an inflation apparatus, for a lifejacket, the inflation apparatus including:- a body; an electronics arrangement, associated with the body, connected to a power supply and an operation means, whereby power is supplied to the inflation device on operation of the operation means; an inflation device, associated with the electronics arrangement, operable between an“off” state and an“on” state on operation of the operation means,

wherein a pressurised CO2 canister is used with the apparatus, connected so that when the inflation device is operated to the“on” state the pressurised CO2 canister is opened whereby the pressurised CO2 is released to inflate the connected lifejacket.

Accordingly, the present invention provides in a further variant, an inflation apparatus, for a lifejacket, the inflation apparatus including: - a body for connection to a lifejacket; an electronics arrangement, associated with the body, connected to a power supply and an operation means, whereby power is supplied to the inflation device on operation of the operation means; an inflation device including a wire means that will create heat on connection to a power supply, at least one change part that will change from a first state to a second state on action of the heat of the wire means, and a spring, movable between from coiled to a sprung state on changing of the change part to the second state, associated with the electronics arrangement,

wherein a pressurised CO2 canister is used with the apparatus, connected so that when the inflation device releases the coiled spring a part of the inflation device is forced to puncture the opening of the pressurised CO2 canister to release the gas into the body to inflate the connected lifejacket.

The operation means may be through use or one or more sensor. The sensor may include a pressure sensor. The sensor may include a timer. The operation means may be to

Accordingly, the invention also provides a method of activation using an activation device, the activation device including a wire means that will create heat on connection to a power supply, a change part that will change from a first state to a second state on action of the heat of the wire means, a spring means, movable between from coiled to a sprung state on changing of the change part to the second state, the method including the steps of: a) Activation of the device;

b) Small current to the device;

c) Current heats the wire means; and d) Changing of the change part through the action of the heat.

Preferably, a sensor included. Preferably, the sensor detects a circumstance when activation of the device is necessary. The sensor may be set to detect being in water for a predetermined length of time. Most preferably, activation only occurs when the predetermined circumstance is detected by the sensor. Preferably, where the person is under the water for more than 15 seconds and the depth of the water is detected as 1 metre or greater the device will be deployed. Other arrangements and predetermined controls may be used. The depth pressure or time may be used individually in some cases. Individual sensors may be used together to detect multiple features. There may be a plurality of sensors. The sensors may be the same or different to one another. Sensors or other features may be included. A timer may be included. These sensors or features may be chosen from the group: accelerometers; gyroscopes; GPS; pressure sensor; water detection; light sensor; or other sensor. The invention may act to sensor or detect a wide range of features to assist in operation of the apparatus. Preferably, one or more sensor is included that detect water pressure. Preferably, water pressure is used to detect the depth of the sensor and in this way the depth of the person wearing the lifejacket may be determined. Equally, timers can be used to determine if the person has been at that depth for more than a predetermined length of time.

The activation device of the method may be the activation device of the invention in any of its forms and variants. The various aspects of the invention and methods may be used together, in partial or full combination as appropriate.

Accordingly, the invention also provides a method of activation using an activation device, the activation device including a wire means that will create heat on connection to a power supply, a change part that will change from a first state to a second state on action of the heat of the wire means, a spring means, movable between from coiled to a sprung state on changing of the change part to the second state, the method including the steps of: a) Activation of the device;

b) Small current to the device;

c) Current heats the wire means; and

d) Changing of the change part through the action of the heat. Preferably, a sensor included. Preferably, the sensor detects a circumstance when activation of the device is necessary. The sensor may be set to detect being in water for a predetermined length of time. Most preferably, activation only occurs when the predetermined circumstance is detected by the sensor. Preferably, where the person is under the water for more than 15 seconds and the depth of the water is detected as 1 metre or greater the device will be deployed. Other arrangements and predetermined controls may be used. The depth pressure or time may be used individually in some cases. Individual sensors may be used together to detect multiple features.

There may be a plurality of sensors. The sensors may be the same or different to one another. Sensors or other features may be included. These sensors or features may be chosen from the group: accelerometers; gyroscopes; GPS; pressure sensor; water detection; light sensor; or other sensor. The invention may act to sensor or detect a wide range of features to assist in operation of the apparatus. Preferably, one or more sensor is included that detect water pressure. Preferably, water pressure is used to detect the depth of the sensor and in this way the depth of the person wearing the lifejacket may be determined. Equally, timers can be used to determine if the person has been at that depth for more than a predetermined length of time.

The activation device of the method may be the activation device of the invention in any of its forms and variants. The various aspects of the invention and methods may be used together, in partial or full combination as appropriate.

Accordingly, the invention also provides a method of use of an improved inflation apparatus including a body, an electronics arrangement and a inflation device, the method including the following steps:- a) connecting a CO2 gas canister to the body of the inflation apparatus;

b) connecting an inflatable lifejacket to the body of the inflation apparatus; and c) operating a switch to turn on the inflation device, whereby a spring of the inflation device is fired at a frangible cover to the opening of the gas canister to puncture it, releasing CO2 gas into the body and thereby into the lifejacket causing inflation. Preferably, the operation is through connection to the electronics arrangement. The inflation apparatus of the method may be the inflation device of the invention in any of its forms and variants.

Accordingly, the in a variant a method of inflation, using the inflation device wherein the inflation device including a wire means that will create heat on connection to a power supply, at least one change part that will change from a first state to a second state on action of the heat of the wire means, a spring means, movable between a coiled to a sprung state on changing of the change part to the second state, the method including the steps of:

a) Activation of the device;

b) Powering the device by a small current to the device;

c) Heating the wire means through use of the small current; and

d) Changing of the or each change part through the action of the heat.

Accordingly, the invention also provides a method of operation of an inflation device, including a low resistance wire that will create heat on connection to a power supply, a change part that will change from a first state to a second state on action of the heat or of the low resistance wire, and a spring, movable between from coiled to a sprung state on changing of the change part to the second state, the method including the following steps: a) causing current to be applied to the wire, whereby it heats;

b) deforming the change part on action of the heating;

c) releasing of the compressed spring, where by the spring causes puncturing of a seal on a CO2 cylinder where by the gas is released to inflate a lifejacket.

Preferably, the inflation device of the method is the inflation device of the invention in any of its forms or variants. The inflation device and method may be used in part, combination or fully in performing the invention.

INDUSTRIAL APPLICABILITY

The invention may be manufactured industrially as an inflation device, or inflation device and life jacket, for example. The inflation device and or inflation device and life jacket may then be provided direct to customers, or to wholesalers or retailers, or to lifejacket suppliers for incorporation in their own products, accordingly.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in connection with non-limiting preferred embodiments with reference to the accompanying drawings, in which:

Figure 1 is a plan view from above of an inflation apparatus according to a first preferred embodiment of the invention, with a pressurised CO2 canister connected, for use with a lifejacket, the life jacket itself is omitted throughout the drawings for ease of illustration;

Figure 2 is a plan view of the inflation apparatus of Figure 1 with the major components shown separated, to show how they connect, one to the other with thread connections

Figure 3 is a long cross-sectional view of the assembled inflation apparatus and pressurised CO2 canister of Figure 1 with the rip cord omitted, rotated, illustrating the internal components;

Figure 4 is a detailed view of the electronics housing of the inflation apparatus of Figures 1 to 3, with the lid removed and shown below the body;

Figure 5 is a perspective view, with internal outline, of the body of the inflation apparatus of Figures 1 to 3 showing only the detail from the end that connects to the electronic housing and before connection thereto;

Figure 6 is a plan view from the front of the inflation device, and electronic housing of Figures 1 to 3 with the remainder of the components omitted;

Figure 7 is a detailed plan view from above of the inflation device of Figures 1 to 3 and 6, removed from the rest of the apparatus to illustrate the mechanism;

Figure 8 is a detailed plan view from the front of the inflation device of Figure 7;

Figure 9 is a detailed long cross-sectional view of the inflation device of Figure 7 illustrating the various components;

Figure 10 is an exploded view of the inflation device of Figures 7 to 9 illustrating the individual components; Figure 1 1 is a detailed perspective view from above of an inflation device according to a second preferred embodiment of the invention and removed from the inflation apparatus. The inflation apparatus used would be as illustrated in Figures 1 to 3, with the exception of the inflation device, and as previously described the life jacket itself is omitted throughout the drawings for ease of illustration;

Figure 12 is a plan view from above (similar to Figure 7) of the inflation device of Figure 1 1 ;

Figure 13 is a detailed plan view from the front (similar to Figure 8) of the inflation device of Figure 1 1 and 12; Figure 14 is a detailed long cross-sectional view of the inflation device of Figure 12 (similar to Figure 9) illustrating the various components of the variant inflation device; and

Figure 15 is an exploded view of the inflation device of Figures 1 1 to 14 illustrating the individual components before assembly.

DETAILED DESCRIPTION OF THE INVENTION INCLUDING A BEST MODE Referring to Figures 1 to 10, a first preferred embodiment of the invention will be described, where general inflation apparatus 1 is shown for use to inflate a lifejacket; the lifejacket itself is omitted from all the drawings, for ease of illustration. The invention has many aspects, an inflation device, an inflation apparatus including an inflation device and an improved lifejacket incorporating the inflation apparatus with inflation device. As shown in the Figures, inflation apparatus 1 , including a new inflation device is illustrated in detail, as well as a further variant to the inflation device, in the later Figures, as described below.

The invention in any of its forms may form part of a lifejacket and or lifejacket inflation apparatus. The lifejacket is omitted from the drawings throughout for ease of illustration but may be any suitable lifejacket. For the illustrated example the lifejacket may be a UML (Trade Mark) lifejacket inflation apparatus connected to a Marlin Australia Inflatable Lifejackets, adapted to incorporate the inflation apparatus and device of the invention, as would be readily understood by the person skilled in the art. Other similar apparatus such as a Halkey Roberts (Trade Mark) may be used instead. Any suitable lifejacket that can be filled or inflated through use of compressed gas may be used with the invention in its various forms.

Referring to Figures 1 and 2 in particular, inflation apparatus 1 , is used with a pressurised CO2 canister 10 which may be supplied separately. The CO2 canister and inflation apparatus that acts to inflate the lifejacket (separate to the inventive activation inflation device) would generally be provided together for use with the invention, and be of a standard form. The invention could also be used with alternative inflation gases or means, not limited to pressurised CO2, as would be readily understood. Any suitable brand or kind of pressurised CO2 canister 10 may be used, but typically it is an 8 gram canister with a 3/8 inch threaded connection, screw end 11 , as well known in the art. Any size canister, for example, an 8 grams to 40 grams canister with a 3/8 inch to ½ inch threaded connection may be used instead. The size and form of CO2 canister 10 with screw end 11 will be dictated by the type and form of lifejacket to be inflated, and the volume of gas being suitable to fully inflate but not over inflate the lifejacket in a single use. Conveniently, a UML (Trade Mark) inflation device is used with attached lifejacket with the inventive activation device. Certain adaptations to the inflation apparatus may be used to adapt for use of the inflation device with the particular lifejacket, as would be readily understood by the person skilled in the art. For the end user, the lifejacket, inflation apparatus and inventive inflation device will be all be assembled ready for use before purchase or use, suitable to the particular arrangement.

Inflation apparatus 1 , used with pressurised CO2 canister 10, includes body 12, with rip cord 13 for manual inflation of the lifejacket. The controls, power and electronics with the inflation device itself are contained in electronics housing 14, which is also attached to body 12. Body 12 is a waterproof container, that acts as a gas inflation chamber, thereby an inflation chamber sealably attached to pressurised CO2 canister 10 by screw end 11 screwing into screw fitting 16 of body 12. Body 12 as an inflation chamber for the pressurised CO2 gas is attached to the lifejacket, so that on operation, controlled but rapid inflation from gas cylinder to inflation chamber to lifejacket can occur. Body 12 is the inflation chamber of a lifejacket with automatic inflation of a known form, as would be understood by the person skilled in the art. Ripcord 13 is a standard means in the art for emergency operation of the lifejacket, allowing easy, quick switching on of the emergency inflation. Other means to manual operate the lifejacket inflation may be included instead.

Electronics housing 14 contains the means to operate and power inflation of a standard form, namely a low voltage battery and simple microcircuit to connect the power source and components and described below. Electronics housing 14 is a waterproof housing, suitable to be used in water and below the surface, as described further below, and maintain the contained parts in working order.

Each of the parts of inflation apparatus 1 of Figure 1 , can be separated for maintenance or storage and may be provided in parts, before assembly for use. The separated inflation apparatus is shown in Figure 2, including the fitted threaded connections and shown in particular in Figure 3, in cross-section. Screw fitting 16 of pressurised CO2 canister 10 enables a strong sealed connection through a screw fit between screw end 11 of canister 10 to body 12. It is important that this connection is strong and sealed, so that the pressurised CO2 gas, when released from canister 10, fills and is contained in the inflation chamber body 12 and is caused to pass into the lifejacket, by overcoming one way pressure valve 17. In this way the release of the CO2 quickly fills inflation chamber 12, and opens pressure valve 17, which in turn quickly inflates the lifejacket to provide the necessary buoyancy for a person. Only when pressure on the one-way valve 17 is sufficient will the pressurised CO2 pass through valve 17 to rapidly inflate the lifejacket and is maintained within the lifejacket, maintaining it in the inflated state.

With reference to Figures 3 and 5 in particular, body 12 the inflation chamber fits to electronics housing 14 through use of a screw fit between screwed end 18 and corresponding screw thread 20 Pressure sensor 21 can be seen in these drawings at a convenient location for providing suitable pressure information, connected to the electronics, as described below. In this way end 18 of body 12 the inflation chamber, can be screwed tightly onto screw thread 20 of electronics housing 14. In this manner body 12 of the inflation chamber and electronic housing 14 are connected in a water tight, gas tight fit, with pressurised CO2 canister 10 when it is also screw attached to body 12. In other words, as canister 10, body 12 and electronics housing 14 are attached through screw fittings 1 1/16 and 18/20 the apparatus is strongly attached in a water proof, gas tight fit ready for use with the lifejacket and inflation device apparatus.

Electronics housing 14, as illustrated, is a waterproof box made of a suitable plastic to contain the electronics of the device labelled generally 22, and protected by lid 24 (refer to Figure 1 and 4). As illustrated in the drawings, together electronics housing 14 and lid 24 form a waterproof seal to keep out water that may adversely act on the contents, forming a sealed box. The electronics referred to generally as 22, includes a power source, microcircuit and the inflation device to control and enable inflation of the lifejacket. As described in detail below, on sensing of particular conditions or on manual activation, power is supplied from the power source, the microcircuit completes, the inflation devices activated and the CO2 gas is caused to release from the canister, to fill the inflation chamber, and through the one way valve once sufficient pressure has been reached the lifejacket. In this way the lifejacket very rapidly inflates, when needed to help the wearer maintain buoyancy in the water, in an emergency or rescue situation.

Pressure sensor 21 can also be seen in this region, mounted on body 12 of inflation chamber, close to electronics housing 14. Pressure sensor 21 is of a known kind, simple to use and program and interface with standard microprocessors, refer https://www.digikey.corri.au/product-detail/en/te-connectivi ty-measurement- and the data sheet being found

for full details. Similar other

pressure sensors may be used as alternatives.

Electronics 22 are connected in the usual manner to pressure sensor 21 , which is convenient, due to the close proximity. Pressure sensor 21 is an useful aspect of the invention, used for detecting the pressure exerted. The pressure detected may be external or internal, and would generally reflect the position within the water. For example, where a person is being splashed by water, they may be wet, the lifejacket may be wet but the actual risk to the person is small, as they are taking part in water sports and being splashed and getting wet, is all part of the usual activity. It is in these circumstances that a standard lifejacket or one that operates to inflate on getting wet would not be useful. When taking part in a water sport activity some time in the water is usual and not usually a circumstance requiring inflation of the lifejacket as the person is safe.

In the present invention the pressure sensor is pre-set to the particular conditions where it is desired for the lifejacket to inflate, for example, if the person is below the water for more than an expected time. As the pressure sensor goes below the water the sensor detects the change in pressure, as the person goes deeper the pressure will increase and this too will be detected and can reach a threshold for activation of the inflation device.

A timer is also included in the electronics arrangement as part of the microprocessor mounted on a circuit board (not shown). Pressure sensor 21 detects the depth of water and the timer measures the time at that depth, so if a person is below the depth of water threshold for longer that the pre-set time then the inflation device will be caused to activated as this is outside of normal use and the emergency use of the lifejacket is caused. For example, in its simplest form, the inflation would occur after the sensors have determined the user has been at greater than 1 metre depth below the water for 15 seconds. Other time or depth combinations can also be predetermined. A preprograming of these features during manufacture can set the times and pressures. These may be varied for different ages of person, or fitness or even sports so that a person can choose from a range of options. It is envisaged that in other forms of the invention there could be some tailoring of the pressure sensor and timing settings by the user. Electronics 22 includes a power source, namely a suitable battery and a microcircuit (neither shown) to control the apparatus. The invention uses a custom made circuit board with micro-controller, but a suitable off-the shelf product such as a programmable logic controller with external power source such as ARDUINO UNO (Trade Mark) https://www.arduino.cc/ can be used. The battery to provide the power source is a lithium- ion battery of a known form. Other types of battery are being trialled and could be suitable, as would be understood by the person skilled in the art. It is through these electronics and battery, of electronics 22 that the inflation device and apparatus generally is controlled and powered.

The cross-sectional view of Figure 3 is particularly useful to illustrate inflation device 28, and its relation to the other components. Electronics housing 14 surrounds inflation device 28, with a waterproof and gas proof seal. Any released CO2 is maintained in the inflation chamber on inflation of the device until the pressure overcomes the one way valve and the lifejacket inflates. Also the waterproof seal of electronics housing 14 keeps the electronics dry throughout. Lid 24 can be readily removed for battery replacement and maintenance but when in place electronics 22 are kept sealed and waterproof by electronics housing 14 and sealed lid 24, fitted with a push fit.

Alignment point 26, as can be seen in Figures 1 and 2 assists the assembly to show the user that the two parts have been screwed together properly when aligned. Alignment point 26 may be omitted in other forms of the invention but is convenient to include.

Inflation device 28 is described further below, but is powered by battery 29 of electronics 22. In Figure 3, the position of battery 29 can be seen next to inflation device 28. The microprocessor for controls and wiring to connect electronics 22 are not shown but fit conveniently within electronics housing 14, the actual position is not of particular import. Pressure sensor 21 is not shown on Figure 3 but as can be seen in Figure 2 is positioned just behind connection 18/20. Pressure sensor 21 can actually be positioned anywhere about the body provided the sensor can work comfortably at the position and can be in communication with the microprocessor, powered by the battery as would be understood. Pressure sensor 21 is a sophisticated sensor, as referred to elsewhere, that can sense both the external water pressure and the relative pressure within the inflation tank. Other forms of pressure sensor 21 may be used instead, connected to cause activation to the inflation device in the predetermined circumstances.

Further, in Figure 3 the relationship between inflation device 28 can be seen with gas canister 10, across body 12 of the inflation chamber, as will be described in further detail below in relation to activation and piecing of the frangible cover to release the gas. Manual operation, rather than use of the pressure sensor, can also be caused by pulling on rip cord 13 to pull rip cord connection 30 which acts like a lever or switch to operate inflation. Pulling on rip cord 30 activates inflation device 28 in the same way, to cause gas release and the lifejacket to inflate once the gas pressure in the inflation chamber exceeds that necessary to open the one way valve, as described elsewhere.

Referring to Figure 4 in particular, electronic housing 14 for electronics 22 are shown separate from the other parts of the apparatus with lid 24 removed. Inflation device 28 has its position indicated by label 28 in Figure 4, but the detail of the drawing is omitted for ease of illustration. Housing 14 is made of a strong waterproof plastic, formed to container the components and seal with lid 24. Lid 24 fits strongly, with a push fit, very difficult to remove without prising off, so as not to dislodge unless it is desired to inspect the components within. Figure 6 illustrates a front view of electronics housing showing schematically the positions of the components.

Referring in particular to Figures 7 to 10, inflation device 28 is illustrated in detail a first embodiment or variant with a novel spring mechanism, referred to generally as spring mechanism 34. Spring mechanism 34 includes a number of components which are held tightly together until operation, so that the spring is compressed, but ready to activate quickly. On operation and supplying power to spring mechanism 34 (the power coming from battery 29 of electronics 22 via connecting wires and a microprocessor) a high powered spring release of spring mechanism 34 is caused, the parts separate and one of is used to causes release of the CO2 from the canister 10 into body 12 of the inflation chamber. The inflation chamber rapidly fills with gas and when the pressure from the gas in the inflation chamber exceeds that necessary, the gas passes through one way pressure valve 17 to inflate the lifejacket. The control of the activation may be through manual operation of rip cord 13, to switch on the power to the circuits. Or the circuits may be activated using the automatic release mechanism connected so that when pressure sensor 21 detects the predetermined“danger” conditions, such as the sensor being at a depth of 1 metre for more than 15 seconds, the power is switched on.

In either manual or automated operation, an electrical current is allowed, through completion of the relevant circuit, to pass from battery 29, through wire 38 of inflation device 28. Wire 38 has a high resistance, in the example being made of nichrome, folded into a U-shape through inflation device 28 to contact where a change is required. On passing current through wire 38, due to the high resistance nature of the nichrome wire it heats but does not melt or deform itself. The heating of high resistance nichrome wire 38 is sufficient to cause heating and or melting to surrounding parts without changing itself, and important aspect of the invention. Change parts included in inflation device 28 are caused to change and deform by the heat caused in wire 38, such that the change enables release of the high tension spring. The remainder of the parts of inflation device 28 can be seen to be ring 40, part 42, plate 44, coil 46 and base 48. Ring part 40 is a simple plastics ring and the heat from wire 38 may cause part of ring 40 to melt or deform. Underlying part 42 is shaped such that catch 50 of base 48 catches in and is held together when first assembled. The heat may cause part of part 42 also to deform or release of ring 40 may be sufficient. In either case parts 40 and 42 are acted upon by wire 38 to translate the electrical current to heating of the wire which in turn may heat, melt or deform parts 42 and or 40 to enable release of catch 50. Ring 44 and base 48 are likewise made of a suitable plastics material, and these are made to not be changed by the heat, although the heating from wire 38 will act locally on parts 40 and 42 and the temperature for the remainder of the inflation device will be much cooler. Spring 46 is shown as a plastics spring but can be made of metal.

As can be seen conveniently in the exploded view of Figure 10, each component is threaded over catch 50 at the top of a peg like part of base 48, first coil 46 which is compressed and held in place by plate 44, and part 42 caught into catch 50. In this way compressed coil 46 is held compressed with part 40 surrounding part 42. Wire 38 pushes into the top of this arrangement, cool in most situations until activation occurs, when the instruction comes through manual operation of the rip cord, or the pressure sensor detects that the lifejacket is needed. Then wire 38 is powered, heats, and the heat causes a change such that part 42 and 40 heat, melt deform or break apart to release catch 50 so tightly compressed coil 46 is released under high tension. A suitable polyamide plastics material is used for parts 40, 42, 44 and 48 as would be readily understood in the art. Other materials can be used, for example base 48 may be made of metal instead. Compressed coil of spring 46 is made of metal in order that there is sufficient force created on release. It is envisaged that other materials could be used, but metal is found to be the best method to create the puncturing force.

Therefore, heating of wire 38 when a current is connected, transfers heat to ring 40, which heats and deforms, expanding, and breaks apart having a lower resistance to heat. As ring 40 has lost its integrity it no longer holds part 42 onto catch 50, and the pressure of the tension of the compressed coil 46 acts to strongly release. It may be that part 40 and 42 both deform to release or it may be one or other of the parts deforms and on that deformation releases the other to release the spring. There may be one or more part that is adapted to melt and break up in respond to the heat of wire 38 when connected to a charge. Variants to the changes part or part is envisaged within the scope of the invention. Further, other forms of change may be caused on activation of wire 38. Once parts 40 and 42 release the underlying spring coil 46, by releasing catch 50, the arrangement is strongly bias away from base 48. Part 42 has a shaped and tapered part to correspond to catch 50 so they are held in place strongly, until the deformation takes place, and there is the release under power of the spring. The shaping of part 42 has been carefully designed to hold strongly in place against the tension of coiled spring 46, but also to readily separate and release once ring 40 is heated. Plate 44 is held in place to housing 14 so that on release the tension in coiled spring 46 is no longer held tightly to plate 44 but instead propelled forward, and away, toward canister 10. breaking apart of part 42 releases catch 50 so that instead of being fixed in place base 48 can move away from being held at the other end and is pushed with force away.

Before use CO2 gas canister 10 is screwed, using screw end 11 to into corresponding screw threaded part 16 of body 12 the inflation chamber. The connection is a gas proof seal between gas canister 10 and inflation chamber 12 such that release of the gas from one to the other will fill the inflation chamber and increase the gas pressure therewithin. Likewise screw thread 20 of electronics housing 14 is connected with screw end 18 of body of inflation chamber. The two are screwed together again in a gas proof and water proof manner so that after the two connects are made gas canister 10 and electronics housing containing the working components are both in a sealed connection with the inflation chamber 12. Once attached and sealed the device is ready to use with a lifejacket, the lifejacket being connected to one way pressure valve 17 at the inflation point, in the usual manner. The components may be sold as a single unit, lifejacket and inflation unit or separately for assembly before use.

At the point before use inflation device 28 is compacted and held tightly together, with the spring apparatus coiled under tension for when it is needed. It is not until power is caused to flow to wire 38, on activation that wire 38 heats and deforms ring 40 and part 42 so that instead of fitting tightly together end 50 of base is then free to move forward and through plate 44 firing through compressed coil 46 towards gas canister 10. The firing forward of base 48 is strong enough to impact the top of the canister. Gas canister 10 has seal 52 of a standard form over the top, a frangible seal over the opening to the contained gas. The frangible seal is adapted so that it does not puncture accidentally, requiring a purposeful puncturing action. Inflation device 28 and the very strong spring action released will cause base 48 to be fired at and puncture seal 52 on operation. Once released the pressurised gas from canister 10 rapidly fills body 12 of the inflation chamber and through one way pressure valve 17, once the valve opens the gas rapidly fills the attached lifejacket. After use, a new gas canister 10 will be required and replacement of inflation device 28. To be able to puncture the gas cylinder in a controlled, low energy use manner and through use of safety pressure sensors, the invention provides a very useful inflation device.

The invention is a very clever new way to rapidly inflate a lifejacket which may be used for wearers who are participating in water sports or may need to briefly contact water, but if they are in danger and do need the lifejacket to inflate this will occur automatically. A manual control is also provided and the invention allows a significant improvement in any number of variants and aspects, over the prior art.

With reference to Figures 11 to 15, a variant to the first preferred embodiment with similar reference numerals used for ease of reference, using a variant inflation device 128. The remainder of the inflation apparatus, the gas cylinder, inflation chamber body, and the electronics used to power and control the inflation device are the same as described with respect to the first embodiment. Likewise the pressure sensor and the method of operation are all the same as described above for the first embodiment. The only differences is a developed form of inflation device 128 over the inflation device (28) used in the first embodiment, which is described in detail below.

Inflation device 128 has a variant novel spring mechanism, referred to generally as spring mechanism 134. Spring mechanism 134 is very similar to spring mechanism 34, and again includes a number of components which are held tightly together. In this way a compressed tension is held, ready to be released to puncture the seal of the gas canister, release the gas and inflate the lifejacket.

The components of inflation device 128 and spring mechanism 134 are labelled with corresponding numerals to the first form, and include wire 138, parts 140 and 142, plate 144, coiled spring 146 and base 148. Parts 140 and 142 are developments from ring 40 and 42 but together act in the same way to be changed on heat from wire 138 and release coiled spring 146, as described further below.

Also different from the first embodiment, base 148 is formed now in two parts and has a separate peg and catch 150. Peg 149 fits into hole 152 of base 148 to connect the two together during assembly.

As for the previously described form, plate 144 is mounted to the structure, and in this form includes a threaded edge, corresponding to a thread on the housing, to assist in construction. Other forms of mounting such as a push fit could be used instead. Coiled spring 146 again is held strongly in place between base 148 and plate 144 mounted to the housing. Peg 149 in this form passes through the hollow centre of part 140 and 142, and plate 144, through the centre of coiled spring 146 before the end fits in hole 152, as would be readily understood. A slot in catch 50 enables use of a screwdriver to tighten the components together by screwing into hole 152. Alternative methods may be used instead but the inventors have found the present arrangement to be of particular benefit. Important to the invention, wire 138 is positioned is this form of the invention, sandwiched between parts 140 and 142. Part 140 fits inside part 142 with the wire 138 fitted between them to facilitate the heating action on applying current. The close proximity of both parts 140 and 142 to wire 138 means the action of wire 138 is maximised and will occur quickly and efficiently after activation. As a current is applied to wire 138 the heat is applied directly between parts 140 and 142 rapidly causing them to heat, deform and break apart, to release coil 146 under tension. Catch 150, is held in part 140, surrounded by part 142. Part 140 can be seen to have tapered parts to assist to hold catch 150 and peg 149 in base 148 all together before release. The tapered and shaped parts of part 140 assist to rapidly deform and break apart, when compared to a solid piece, when acted upon by heat from wire 138. In this way the heat causes a quick change and release of the parts, and spring mechanism.

On operation and supplying power to wire 138 from a battery via connecting wires and a microprocessor, a high powered spring release of spring mechanism 134 is caused, the parts separate to cause release of the CO2 from the gas canister into the inflation chamber. The inflation chamber rapidly fills with gas and when the pressure from the gas in the inflation chamber exceeds that necessary, the gas passes through a one way pressure valve, to inflate the lifejacket.

Wire 138 has a high resistance, in the example being made of nichrome, sandwiched between parts 140 and 142 to quickly cause the changes. On passing current through wire 138, due to the high resistance nature of the nichrome wire it heats sufficient to cause heating and or melting to surrounding parts. Change parts included in inflation device 128 are caused to change and deform by the heat caused in wire 138, such that the change enables release of the high tension spring.

Before use a CO2 gas canister is screwed into the inflation chamber and the inflation chamber to the electronics housing so these are sealed together. The lifejacket has already been connected to the one way valve of the inflation chamber, and the pressure sensor conditions set. In the example a range of conditions have been predetermined as warranting the inflation of the lifejacket, including being at depth of more than 1 metre for more than 15 seconds or if the jacket passes below the 1 metre depth. The conditions can be varied within the scope of the pressure and timer sensors used as would be readily understood.

Now ready for use, inflation device 128 is compacted and held tightly together, with the spring apparatus 134 coiled under tension, ready to be rapidly released. It is not until power is caused to flow to wire 138, on activation that wire 138 heats, and due to the positioning between parts 140 and 142 rapidly heats and deforms those change parts. Heat from wire 138 is, in this form of the invention applied directly to the parts 140 and 142 so causing a very rapid change. The tapering of part 40 enables parts to quickly melt and or deform to break apart and release.

Once wire 138 heats, and the deformation of the change parts occurs the operation is exactly as described as for the first embodiment. This includes the firing forward of base 148 to impact the top of the canister to break the frangible seal and release the gas into the inflation chamber. Once released the pressurised gas rapidly fills the inflation chamber and through one way pressure valve the attached lifejacket. Overall, the inventors have developed very clear improvements over the prior art. The activation device can be used as a low power device that can deliver a high force. In other forms the activation device may be used as an inflation device to cause inflation of a life-jacket. The invention is likely to be very well received as both a new method of inflation for lifejackets, but also for any other application of the activation device.

It will be apparent to a person skilled in the art that changes may be made to the embodiments and variants disclosed herein, without departing from the spirit and scope of the invention in its various aspects.

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