CA2634651C - Breathing apparatus and pressure vessels therefor - Google Patents
Breathing apparatus and pressure vessels therefor Download PDFInfo
- Publication number
- CA2634651C CA2634651C CA2634651A CA2634651A CA2634651C CA 2634651 C CA2634651 C CA 2634651C CA 2634651 A CA2634651 A CA 2634651A CA 2634651 A CA2634651 A CA 2634651A CA 2634651 C CA2634651 C CA 2634651C
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- vessel
- air
- vest
- vessels
- pressure
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B25/00—Devices for storing or holding or carrying respiratory or breathing apparatus
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
- A62B7/02—Respiratory apparatus with compressed oxygen or air
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- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Medicine (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
There is described a wearable garment capable of supplying air to a user comprising a plurality of compartments disposed about the garment, a plurality of air storage vessels for fitting into respective ones of the compartments, an air regulator, a connector for connecting the plurality of air storage vessels to the regulator, and a breathing member connected to the regulator in fluid communication therewith, wherein the breathing member allows a user to receive air from the plurality of air storage vessels.
Description
BREATHING APPARATUS AND PRESSURE
VESSELS THEREFOR
FIELD OF THE INVENTION
The present invention relates to self-contained breathing apparatus, and mqre particularly to breathing apparatus in the nature of a vest worn by a user having pressurized cylinders orflasks of breathable airdistributed in thevest, self-contained underwater breathing apparatus and specifically, self-contained breathing apparatus that may be wom by the user. The apparatus is used for, among other things, firefighting, emergency air supply for workers in hazardous environments or underwater use.
BACKGROUND OF THE INVENTION
The disadvantages of previous air breathing apparatus include their weight, bulk, awkwardness, restrictions they create in closed confinement spaces, their risk of explosion and the marginal minutes of breathable air they provide in both emergency and continuous duty situations.
Previous designs have often put the air supply either high on the back of the user or to the side of the user, causing the user'S centre of grsvity to be shifted, thus creating strain on the user when wearing the apparatus and making continuous use of the apparatus difficult.
Further, in in'dustry, emergency escape apparatus typically only provide 5 minutes to 15 mfnutes of breathable air. This gives the user a false sense of security since documented evidence shows that in many cases more tirne is required. For miners, accidents can require that the miner have one to two hours of breathable air to allow for safe evacuation. Construction workers building additions beside operating gas plants and refineries have found Insufficient evacuation routes in the past and found a 5-16 minute emergency air supply was not enough.
Other problems with self-contained breathing apparatus include the fact that they do not compensate for the size of the user, It is a well known fact that a large person consumers more air per minute than a srnaller person. Thus by providing the same emergency device to both individuals, tho large person will have less time to safely escape the hazardous situation.
One of the main drawbacks to increasing eir supply is the weight of tanks to carry the air. These tanks are generally large metal cylinders that are charged to approximately 3000 psi.
Orie solution to the weight problem is to create composite vessels with a metal liner and a composite structural component. These vessels still however have to be sufficiently strong to prevent failure, and thus the pressure in these vessels is limited.
Another problem with current air vessels, especially filament-epoxy wound containers, is that they have several deficiencies. These vessels do not have a good Impact resiatence capability, and are susceptible to rupturing If damaged.
Further, rupturing of these vessels generally causes fragments to be propelled at high speeds, endangering those near the vessel.
Another problem with fibre-epoxy windings is that they do not withstand adverse environmental conditions very well. Exposure to caustic environments Is possible, for exarnple, in firefsghting applicatiorls or in breathing devices designed for evacuation from chemical or industrial plants. These devices therefore need protection from the adverse environment.
SUMMARY OF THE INVENTION
The present air vest apparatus addresses all of the above problems- for existing self-contained breathing apparatus. This vest device is. engineered to provide a self-contained breathing apparatus option suited for closed confinement applications in all of the categories for fire fighting, industrial, marine and aircraft environments.
VESSELS THEREFOR
FIELD OF THE INVENTION
The present invention relates to self-contained breathing apparatus, and mqre particularly to breathing apparatus in the nature of a vest worn by a user having pressurized cylinders orflasks of breathable airdistributed in thevest, self-contained underwater breathing apparatus and specifically, self-contained breathing apparatus that may be wom by the user. The apparatus is used for, among other things, firefighting, emergency air supply for workers in hazardous environments or underwater use.
BACKGROUND OF THE INVENTION
The disadvantages of previous air breathing apparatus include their weight, bulk, awkwardness, restrictions they create in closed confinement spaces, their risk of explosion and the marginal minutes of breathable air they provide in both emergency and continuous duty situations.
Previous designs have often put the air supply either high on the back of the user or to the side of the user, causing the user'S centre of grsvity to be shifted, thus creating strain on the user when wearing the apparatus and making continuous use of the apparatus difficult.
Further, in in'dustry, emergency escape apparatus typically only provide 5 minutes to 15 mfnutes of breathable air. This gives the user a false sense of security since documented evidence shows that in many cases more tirne is required. For miners, accidents can require that the miner have one to two hours of breathable air to allow for safe evacuation. Construction workers building additions beside operating gas plants and refineries have found Insufficient evacuation routes in the past and found a 5-16 minute emergency air supply was not enough.
Other problems with self-contained breathing apparatus include the fact that they do not compensate for the size of the user, It is a well known fact that a large person consumers more air per minute than a srnaller person. Thus by providing the same emergency device to both individuals, tho large person will have less time to safely escape the hazardous situation.
One of the main drawbacks to increasing eir supply is the weight of tanks to carry the air. These tanks are generally large metal cylinders that are charged to approximately 3000 psi.
Orie solution to the weight problem is to create composite vessels with a metal liner and a composite structural component. These vessels still however have to be sufficiently strong to prevent failure, and thus the pressure in these vessels is limited.
Another problem with current air vessels, especially filament-epoxy wound containers, is that they have several deficiencies. These vessels do not have a good Impact resiatence capability, and are susceptible to rupturing If damaged.
Further, rupturing of these vessels generally causes fragments to be propelled at high speeds, endangering those near the vessel.
Another problem with fibre-epoxy windings is that they do not withstand adverse environmental conditions very well. Exposure to caustic environments Is possible, for exarnple, in firefsghting applicatiorls or in breathing devices designed for evacuation from chemical or industrial plants. These devices therefore need protection from the adverse environment.
SUMMARY OF THE INVENTION
The present air vest apparatus addresses all of the above problems- for existing self-contained breathing apparatus. This vest device is. engineered to provide a self-contained breathing apparatus option suited for closed confinement applications in all of the categories for fire fighting, industrial, marine and aircraft environments.
The compactness of the vest, the longer duration of its air supply due to the variety of the numberof possible cylinderorflask,combinations, its diminished explosive risk and the unique compartmentalization of the vests allows an Increased amoUnt of breathable minutes of air In the garments. The air vest incorporates the function of being able to calibrate the breathable minutes of air on an individual basis.
The advantages of the air vest garment can create new categories of field applications as an emergency escape apparatus and as a working ("prolonged use"
or "continuous duty") apparatus. It is enVisioned that some of these new categories will include Emergency Preparedness for diplomat personnel, government employees, highrise off'ice workers, polioe tactical units, armed forces, naval ship personnel, passenger and cargo ship personnel, aircraft personnel, hotel and motel employees, rail workers, drivers transporiing hazardous goods, asthmatics requiring a portable oxygen supply, residents living In the proximity of possible hazardous incidents, lab technicians, and construction workers, particularly those working in or near potential hazards.
The air vest technology provides a unique, versatile compact design with considerable fiexibility as to the numerous cylinder or flask combinations.
Specific Job task assignments will dictate: (1) the number of cylinders or flasks; (2) whether the cylinders or flasks are composite or metallic compounds; (3) the size of the cylinders or flasks; and (4) the working pressure of each particular model.
Inasmuch as a preferred objective is to engineer an air vest with minimal thickness, dimensional ne.iuctions of the cylinders orflasks will provide reduced vest thickness.
With a view towards allowable working pressures above the "industry-norm", there is provided a high strength flexible pver-wrap for use on pressure vessels.
Specifically, one aspect of the present invenfion provides for the use of a carbon composite filament saturated with a liquid rubber compound which is wound around an existing pressure vessel and cured. In a preferred embodiment the carbon composite is KevlarT".
The carbon fibre over-wrap of the preserft invention is used to add strength, impact resistance, explosion containment, and exposure protection to any existing pressure vessel.
By alleviating the explosive risk of high pressure cylinders with the incorporatian of the containment overwrap, It may become possible to initiate applications to increase the standard working pressures of SCBA (self contained breathing apparatus) and SCUBAs (self contained underwater breathing apparatus).
The containment overwrap should also allow the exterior surface of the composite cylinders or flasks to maintain a pristine quality for an extended number of years relative to prior art in the field.
In order to allow higher air pressure to be used in cylinders, there may additionally be provided a metal braid containment overwrap. The braided containmentoverwrap creates a net around the cylinder or flask and confines propelled fragments from a ruptured cylinder or flask.
To provide for a user's safety, there are also provideNd deflector plates whlch are secured between the cylinders or flasks andthe user. These plates are comprised of a new carbon fiber core material.
The high pressure cylinders or flasks are attached within pockets of the present vest garment, device. The flasks or cylinders are Interconnected with low pressure pneumatic hose between each other and the second stage regulator at chest height which supplies air on demand to the respirator-face piece. This design therefore is relatively compact, lightweight and easy to use. A combination high-pressure shut-off valve, first stage regulator and low pressure valve are contained in the regulator-valve body attached to each cylinder or flask. This device regulates the cylinder or flask's working pressure down to 30 psi - 60 psi. The reduced pressure is supplied into a low pressure pneumatic hose which interconnects all of the cylinders or flasks to the second stage regulator at chest height on the front of the vest garment.
A further pneumatic hose connects the second-stage regulator and the face-piece.
Air pressure is reduced to atmospheric pressure by the second-stage regulator.
in some applications, the pneumatic hose will be replaced with a metal air manifold.
The present invention therefore grovides a wearable garment apparatus capable of supplying air to a user comprising a plurrality of compartments disposed about said garment; a piurality of air storage means for fitting into respective ones of said compartments; regulator means; conduit for connecting said plurality of air storage means to said regulator means; and a breathing member eonnected in fluid communication to said regulator means; wherein said breathing means allows a user to receive air from'said plurality of air storage means.
The present Invention further provides a composite carbon fibre core comprising a first carbon fibre fabric layer; a second carbon fibre fabric layer; and an inner layer of carbon fibre disposed between said='Brst and second layers; wherein said inner layer of carbon fibre has carbon fibres disposed substantially perpendicularly to carbon fibres within said first and secortd carbon fibre fabric iayers.
The present invention still further provides a method for making a composite carbon fibre core comprising the steps of placing a first carbon fibre fabric layer substantiaiiy horizontally; creating a se.cond layer through the steps of placing mixed carbon fibre and epoxy materials Into a mould; and cutting layers from said mixed materials;
placing said second layer over said frr$t layer; placing a third layer of carbon fibre fabric over said second layer; and curing the combination.
The present invention yet further provides an air containment vessel comprising an inner bladder made of rubber; a structural core; an outer rubber cover; and an air outlet; whereby said inner bladder fits concentrically within said core and said core _5-fits concentrically within said outer cover, and whereby said air outiet provides fluid communication for air leaving and enterinp said vessel.
The present invention still further provides a method of making a composite carbon fibre air containment vessel having an intemal bladder, comprising the steps of creating a wax module in the shape of the inside of the air containment vessel;
inserting an air inlet tube into one end of said wax module; dipping said wax module into a liquid to form a layer of bladder material on sald wax module; allowing said layer to cure; filament winding a carbon fibre core over said bladder layer;
curing the carbon fibre core by heating, thereby also melting the wax module; dipping said carbon fibre care into liquid rubber creating an outer rubber layer; and allowing said outer rubber layer to cure.
The present invention still further provides a containment means for a pressurized fluid vessel comprising a plurality of wires wrapped about said vessel; a plurality of fastening means for securfng the ends of respective ones of said wires together, said fastening means having energy absorbing means therein to allow controlled expansion of soid wire in the event of vessel failure; and whereby each wire can be affixed at a second end to a lug using cones and stoppers within the lug.
The present invention yet further provides a protective over-wrap for a pressure vessel comprising a carbon composite thread; and a liquid rubber; wherein said carbon composite thread is immersed in said liquid rubber and subsequently wound about said pressure vessel, and wherein said pressure vessel with said carbon composite thread and liquid rubber winding are then cured.
The present invention further provides a method of creating a proteCtive over-wrap for pressure v ssels comprising the steps of saturating a carbon-composite thread In a liquld rubber compound; winding said saturated thread about said pressure vessel; and curing said pressure vessel and saturated thread; whereby said rubber and carbon composite thread comprise said protective over-wrap.
~6-BRIEF DESCREpTION OF THE DRAWINGS
Preferred embodiments of the present invention will now be described in greater detail and will be better understood when read in conjunction with the following drawings in which:
Figure 1 is a schematical view of the vest apparatus as seen from the rear;
Figure 2 is a schematical view of the vest apparatus as seen from the front;
Figure 3 is a cross sectional view of a preferred embodiment'of a high pressure vessel and fitting;
Figure 4 is a cross sectional view of a second plate and nut arrangement that may be attached to the fittings of Figure 2;
Figure 5 is a cross sectional view of a high pres$ure vessel, Figure 6 is an enlarged cross sectional vi'ew of a portion of the vessel of Figure 3;
Figure 7 is an end view of a wax module for creating the vessel of Figure 3;
Figure 8 is a side view of a wax module fpr creating the vessel of Figure 3;
Figure 9 is a perspective view of a modified shape of an air vessel including aT"
ftting;
Figure 10 is a perspective view of another embodiment of a pressure vessei, including a regulator;
Figure 11 is a schematical view of a containment bag for the vessel of Figure 3;
Figure 12 is a cross sectional view of a suppression device used in the containment bag of Figure 11;
Figure 13 is the prior art configuration of an "i-beam" balsa wood core composite;
Figure 14 is a cross section showing a new pure carbon fibre composite material;
Figure 15 is a view of a prior art regulator-valve body assembly; and Figure 16 is a cross sectional view of a vessel with a protective ovenarrap.
DETAILED DESCRIPTION OF THE DRAWINGS
The present invention consists of a compact, lightweight, self contained air breathing apparatus in the form of muitiple, high pressure vessels or vessels that are contairned within a body vest and in a preferred embodiment are designed to provide a user with at least 30 minutes of breathable air.
Referring to Figures 'i and 2, the construction of the vest apparatus I in the present invention consists of a series of distinct components that are interconnected in order to provide the functionality of the apparatus. These components include a series of high pressure vessels 10 or vessels that are Interconnected, a containment bag (Figure 11) or device to protect a user in the case of a rupture of one of the high pressure vessels, an explosion shield 65 placed within the vest and between a user and the high pressure vessels in order to further protect a user in the case of an explosion or rupture of one of the vessels, a breathing piece 49, and the vest structure I comprised of a material suited to the envisioned use of that particular vest apparatus. Further features such as pressure monitoring sensors and alarms, straps 7 for securing the vest apparatus more securely to a user, regulators, T
fittings, etc., may also be included in the vest. Each of these components and how they interconnect will be described in more detail beiow, starting with preferred air vessels used, including containment means for these vessels to allow them to be charged to a higher pressure, and then deflector ineans placed within the vest between the vessel and the user, and then the regulators, hoses, and respirators used.
The vest I uses a series of interconnected high pressure vessels 10. These vessels are illustrated in Figures 3 to 6, and in a preferred embodiment are comprised of an entirely non-metal structure to reduce their weight. Vessels 10 are discussed in greater detail below. Other metal embodiments of the vessels could also be used in the present invention, and this disclosure is not intended to limit the type of vessel that may be used within the present vest apparatus. One such vessel that is contemplated is illustrated in Figure and is made by Luxfer USA Limited.
Pressure vessels 10 are preferably chargeable to extremely high working pressures, generally within the range of 4500 - 7500 PSI. For safety, vessels 10 can be tested up to 15000 PSI. This is compared to the. prior art air vessels Which are more typically charged in the 3000-4500 PSI range.
Vessels 10 are preferably made of a carbon fibre epoxy and eomprise body portion 12 which has a rubber or nylon.coating 14 on Its inner surface and a rubber or nylon coating 16 on its outer surface. Carbon Pbre and epoxy were chosen due to strength and weight considerations. The shape of the vessel can be a traditional cylinder, or cari be more eliiptical (as shown in Figure 5) to more closely fit a user, and can range in sizes. Other possible cor,figurations are shown in. Figures 9 and 10.
The inner rubber coating or bladder 14 lis preferably used to provide strength and to avoid corrosion. Rubber removes the problem of corrosion associated with aluminum liners used currently in the art, and removes the need to tumble vessels in order to remove any corrosion. Lack of corrosion should also ensure that the strength of the vessel will not diminish from Its original design values.
The inner rubber bladder 14 Is created through the use of a wax module 20, as can be seen In Figures 7 and 8. Wax module 20 Includes inlet fittings 22, as deseribed below, and is dipped in liquid rubber and allowed to cure. An inner nylon liner can optionally be formed by rotomoulding. Aiternatively, an aluminium anodized liner can be used instead of a rubber liner.
-g_ Once cured, the wax module 20 and inner bladder 14 are mounted on a lathe and the carbon filament is wound onto bladder 14. The filament would vessel and wax module are then heated in an oven at between 200 and 450 degrees Fahrenheit, depending on the epoxy used to bond the carbon ttiaments. The heating melts the wax module 20. The wax is drained away, leaving behind the bladder lining the interior of core 12.
The core 12 and bladder 14 are then pre#'erablyx-rayed for imperfections and quality assurance. Once this is done, the outer rubber layer 16 is created by dipping the assembly into liquid rubber. This outer rubber layer 16 provides strength and prevents hazardous materials from contacting the carbon fibre core. This protects against chemicals compromising the Integrity of vessel 10.
In addition to, or instead of, outer rubber layer 16, a composite overwrap can be used. The overwrap is best seen in Figure 16. This figure shows pressure vessel 10 comprised of liner 14 and core 12. L,iner 14 can be a metal or rubber liner, as described above. Core 12 can be a carbon fibre / epoxy mixture, as disclosed above.
Core 12 allows vessel 10 to be filled to its preset pressure without rupturing.
Liner 14 may not be necessary if core 12 is comprised of stainless steel or aluminium. These rriateriais provide enough containment to be used without a liner.
Over-wrap layer 60 is wound over core 12: Over-wrap layer 60 is comprised of a carbon composite thread that is immersed in a liquid rubber. Preferably the carbon composite thread consists of Keviar37' .
The thread and rubberare then filamentwound around thevessei to a predetermined thickness. This winding may be done using a computerized lathe in order to achieve a uniform thickness about pressure vessei 10. -4noe the winding Is compiete,'pressure vessel 10 with its over-wrap layer 60 are then cured to solidify over-wrap layer 60.
The composite overwrap 60 of Figure 16 could also be used on prior art pressure vessels to strengthen and protect these Wesseis.
Over-wrap 60 helps mitigate some of the disadvantages that pressure vessels currently have. In particular, due to the high strength of KeviarTM, present over-wrap layer 60 should provide complete containrnent in the case of a failure of the pressure vessel. This should therefore protect those around the pressure vessel who might previously have been harmed by high vel'ocity fragments created by the failure of the pressure vessel. With the overwrap, pressure vessel 10 may be able to be pressurized cioserto its maximum capacity, allowing more gas to be stored within the pressure vessel.
Also, the rubber within the windings creates better impact resistance for pressure vessel 10, further protecting it. Rubbor will generally cushion an impact to the pressure vessel.
Still further, due to the rubber in the winding, the pressure vessel will be better able to withstand caustic environments, creating greater safety for those dependent on the pressure vessel.
The open end of each vessel 10 indudes an inlet fitting 22, as can be seen in Figure 3 and in -grearter detail in Figures 4 and 6. lnlet portion 22 includes iwo spaced apart stainless steel plates 24, each with a circular hole 23 in the centre. A
cyiindricai stainless steel air fitting 26 whose outer diameter fits concentrically within holes 23 in the steel plates is positioned through holes and the steel plates and air fitting 26 are then welded together at weldments 25. Steel plates 24 are arrang'ed paraliel to each otherwith the gap between them corresponding to the width of carbon fibre core 12 of vessel 10. When the carbon fibre is formed within this gap, its strength will ensure that ftting 22 will not be blown out of vessel 10 due to=the pressures involved.
This is further tested after the manufacture of the vessel by charging the vessel to considerably higher than the rated working pressure and ensuring that vessel does not rupture and air ftting 22 remains in place.
_11 The steel plate 24 disposed towards the inner surface of vessel 10 further includes two flanges 28 welded to it orformed lntegtally therewith and protruding substantially perpendicularly to steel plate 24 and into-vessel 10 and into wax module 20.
This reduces the likelihood of wax module 20 moving during the filament winding process about spindle 21 as most clearly illustrated (n Figure 8 which shows the flanges anchored in the wax.
The outer ernd of the steel air fitting 26 is threaded at 27 to allow a cap 30 Figure 8) to be added to the fitting. Threads 27 canl also be used to secure a second plate 32 with a nut 34 or a nutflock washer combination to outer steel plate 24 as shown most Clearly in figures 3 and 4.
Second plate 32 is shaped and adapted to accommodate regulator body housing 40 of a first stage regulator 44 (Figure 1) as illustrated in Figure 4. As can be seen frnm this figure, second plate 32 includes a skirt 33 with holes 37 for screws 36 that pass through the holes to connect regulator body 40 to second plate 32 for additional safety backing up the connection of rege4ator body 40 to threads 27 on fitting 26.
In operation, the vessels are charged cind with reference to Figure 1, air passes through first stage regulators 44 attached to the steel air fitting 26 of each vessel 10.
A series of low pressure lines 46 connect all of the vesseis together through the use of stainless "T or "Y' fittings 42, and a low pressure supply line 47 9s connected to a second stage regulator 48 on the front of the vest. Lines 46 and 47 are made from low pressure f[exble pneumatic hose designed to withstand the pressures under which the vest is to be tested; or they may comprise metallic hose or a metallic manifold. Although pressure vessels 10 can be disposed on both the front and back of the vest, its contemplated that in most applications, the vessels will be confined to the vesfs back.
Second stage regulator 48 of the present vest apparatus is also selected of course to withstand the pressures under which the vessels are to be tested. In a preferred embodiment, the second stage regulator will be of a quick ooupling mechanism type and will allow for the connection of multiple face masks or mouth pieces 49, i.e., one for a rescuer and one for the person being resqued. The regulator is placed on the vest in a location that allows easy and rapid connection of the face masks.
The location should also allow a user to easily read a pressure gauge on the regulator.
In a preferred embodiment the regulator will also have an alarm to signal to the user when the pressure falls below a certain level.
A respirator can be designed to easily attach to the second stage regulator.
Various types of breathing apparatus are contemplated, including a mask to fit over a users nose and mouth, a simple mouth piece, a SCUBA respirator or a clear plastic anti-fogging hood, such as those currentiy used in -the art.
Due to the high charge pressures of vesseis 1p, the vest apparatus further includes several safety features. The first is a containment bag 50 that Is secured to the outside of vessel 10. A preferred containment bag 50 is shown in Figure 11.
Containment bag 50 consists of braided steiinless steel aircraft cable 52 woven around vessel 10 to resemble a fish net, preferpbly on approximately 2.5 cm squares.
The dimensions of containment bag 50 allow vilrtually no clearance between the cable and the exterior rubber bladder 16 or overwraO 60 of vessel 10. This confines vessel 10, and in the case of an explosion or rupturk any propelled fragments are limited in size to the space between the braids. The rubber bladder 16 or overwrap 60 on the outer surface of vessel 10 should als - act to 'further suppress any flying fragments.
Cable *52 of containment bag 50 is held -in place through the use of special suppression lugs 54, a cross section of one of which is shown in Figure 12, These suppression lugs 54 are crimped at strategic; points on cable 52 to hold and tighten containment bag 50 in place. As can be seen in Figure 12, each suppr$ssion lug preferably includes three lead cones 56 and a stainless cable end anchor plug 58 to hold cable 52 within lug 54. The other end oti cable 52 is perrnanently secured to lug 54, thus creating a closed loop. In the event of a repture of vessel 10, the compression of cones 56 between plug 58 arld the end of lug 54 will dissipate energy.
The strength of cable 52, along with rubber biadder 16 or overwrap 60, should act to prevent any fragments from escaping from vessel 10. If, however, a fragment dobs escape, the present vest apparatus may further be provlded with a novel deflection shield 65 disposed between the user and the vessel.
The defection shield is comprised of a materiai-that should withstand and absorb the impact of a high speed fragment hitting it. In order to ensure that the weight and bulk of the vest apparatus is minimized, it Is furthbr desirable to ensure this deflection shield is as thin and, light in weight as possible. This is accomplished through the use of a new composite material.
Prior art for carbon composite materials lnciudes the "I-beam" configuration 70 as shown in Figure 13. This type of core is referred to as "End-Grain-Balsa", wherein the vertical portion 71 of the I-beam is balsa wood, and the horizontal portions 72 i5 above and below the "I" are applied carbon.fibre fabric.
The present deflection shield 65 (shown in Figure 14) comprises carbon fibre and high quality epoxy, providing higher impact resistance than most core materials. For this Improvement, the balsa wood core of,previous compasites is replaced with vertical carbon fibre strands 66. This core prtrferably measures between one-eighth of an inch to more than two inches in thickness depending upon the level of protection required. The carbon fibres are cpntinuous-roving, pre-impregnated tow, meaning the fibres have been previousiy impregnated in an epoxy-bath with epoxy which will begin its cure process with the in#raduction of heat and light.
The core of the present composite is preferebiy created by placing fibres in a trough approximately 6-inches wide by .6 inches deep by three feet in length. The trough has a plastic liner allowing the fibres to eWly move in the trough. The finished material can be cut to a predetermined thickness using known techniques.
The cut slices are placed on a sheet of pre-impregnated carbon fibre fabric 72. A
second layer of the fabric 72 is placed on top of the slice, creating a pure carbon fibre core material. The material is then placed in refrigerated storage unfil ready for delivery. The present invention further oontemplates using this new core for other uses besides deflection plates.
All of the above components are placed within a vest as may be seen in Figure 1.
The vest is constructed in a compartmet-talized fashidn such that the components are of sufficient capacity to allow for the easy insertion and removal of the vessels.
The number of vessels is dependant upon the size of the vessels and the physical size of a user's vest, where a child's veSt may only accommodate four vessels for example, and an extra large vest may include twelve vessels. Each compartment further allows a deflector plate 65 to be installed behind the vessel, protecting the user in case the vessel explodes or ruptures.
The compartments of the vest are evenly distributed on the back of the vest but they can also be distributed on the front and the back if desired.
In one embodiment of the present invention, the vest is constructed to incorporate a "quick connect' strap 7 under the buttoCks of a user to prevent the vest from rising and interfering with the face mask. The vest may also include a drawstring at its bottom which can be used to tighten the bottom of the vest.
Figure 1 shows vest I which includes a Series of vessels 10 located at various points along a user's back. Vessels 10 are interconnected with a series of first stage regulators 44 and hoses 46 which connect to second stage-regulator 48 on the vesYs front.
As described above, second stage regulator 48 is placer! in a(ocation that is easily accessible to a user to allow for both the connection of a respirator and to facilitate the checlung of the amount of air left in the vessels. This location would generally be at chest height and on the front of the garment.
-~~a-The vest can further include storage compartmer<ts into which the respiratorfits, such that the respirator can easily be accessed in the case of an emergency_ Other embodiments envisioned include a storage compartment for a spare mask or hood allowing the rescue of a victim during an emergency.
The material the vest is made from will depend on its intended application,*
If the vest is to be used In a fire rescue situation, the material can be the same as that presently used in fire fighting clothing, and thus be fire resistant. Conversely, if the vest is to be used in mountaineering or marine environments, it can be constructed of a insulating or waterproof fabric, The air vest device thus provides a coMpact system with a considerably longer air supply than current self contained breathing apparatus on the market. It is envisioned that the vest may be used ifor a number of applications inciuding:
fire fighting, oil i9eld and gas plant operatiDns, mining operations, underwater diving environments, search and rescue units, irzdustrial chemical processing plants, NASA, passenger aircraft personnel, police tadticai units, and anned forces world,wide_ The above-described embodiments df the present invention are meant to be iilustrative of preferred embodiments of the present invention and are not intended to limit the scope of the present inventson. Various modifications, which would be readily apparent to one skilled in the art, are Intended to be within the scope of the present invention. The only limitations'bo the scope of the present invention are set out in the following appended claims.
The advantages of the air vest garment can create new categories of field applications as an emergency escape apparatus and as a working ("prolonged use"
or "continuous duty") apparatus. It is enVisioned that some of these new categories will include Emergency Preparedness for diplomat personnel, government employees, highrise off'ice workers, polioe tactical units, armed forces, naval ship personnel, passenger and cargo ship personnel, aircraft personnel, hotel and motel employees, rail workers, drivers transporiing hazardous goods, asthmatics requiring a portable oxygen supply, residents living In the proximity of possible hazardous incidents, lab technicians, and construction workers, particularly those working in or near potential hazards.
The air vest technology provides a unique, versatile compact design with considerable fiexibility as to the numerous cylinder or flask combinations.
Specific Job task assignments will dictate: (1) the number of cylinders or flasks; (2) whether the cylinders or flasks are composite or metallic compounds; (3) the size of the cylinders or flasks; and (4) the working pressure of each particular model.
Inasmuch as a preferred objective is to engineer an air vest with minimal thickness, dimensional ne.iuctions of the cylinders orflasks will provide reduced vest thickness.
With a view towards allowable working pressures above the "industry-norm", there is provided a high strength flexible pver-wrap for use on pressure vessels.
Specifically, one aspect of the present invenfion provides for the use of a carbon composite filament saturated with a liquid rubber compound which is wound around an existing pressure vessel and cured. In a preferred embodiment the carbon composite is KevlarT".
The carbon fibre over-wrap of the preserft invention is used to add strength, impact resistance, explosion containment, and exposure protection to any existing pressure vessel.
By alleviating the explosive risk of high pressure cylinders with the incorporatian of the containment overwrap, It may become possible to initiate applications to increase the standard working pressures of SCBA (self contained breathing apparatus) and SCUBAs (self contained underwater breathing apparatus).
The containment overwrap should also allow the exterior surface of the composite cylinders or flasks to maintain a pristine quality for an extended number of years relative to prior art in the field.
In order to allow higher air pressure to be used in cylinders, there may additionally be provided a metal braid containment overwrap. The braided containmentoverwrap creates a net around the cylinder or flask and confines propelled fragments from a ruptured cylinder or flask.
To provide for a user's safety, there are also provideNd deflector plates whlch are secured between the cylinders or flasks andthe user. These plates are comprised of a new carbon fiber core material.
The high pressure cylinders or flasks are attached within pockets of the present vest garment, device. The flasks or cylinders are Interconnected with low pressure pneumatic hose between each other and the second stage regulator at chest height which supplies air on demand to the respirator-face piece. This design therefore is relatively compact, lightweight and easy to use. A combination high-pressure shut-off valve, first stage regulator and low pressure valve are contained in the regulator-valve body attached to each cylinder or flask. This device regulates the cylinder or flask's working pressure down to 30 psi - 60 psi. The reduced pressure is supplied into a low pressure pneumatic hose which interconnects all of the cylinders or flasks to the second stage regulator at chest height on the front of the vest garment.
A further pneumatic hose connects the second-stage regulator and the face-piece.
Air pressure is reduced to atmospheric pressure by the second-stage regulator.
in some applications, the pneumatic hose will be replaced with a metal air manifold.
The present invention therefore grovides a wearable garment apparatus capable of supplying air to a user comprising a plurrality of compartments disposed about said garment; a piurality of air storage means for fitting into respective ones of said compartments; regulator means; conduit for connecting said plurality of air storage means to said regulator means; and a breathing member eonnected in fluid communication to said regulator means; wherein said breathing means allows a user to receive air from'said plurality of air storage means.
The present Invention further provides a composite carbon fibre core comprising a first carbon fibre fabric layer; a second carbon fibre fabric layer; and an inner layer of carbon fibre disposed between said='Brst and second layers; wherein said inner layer of carbon fibre has carbon fibres disposed substantially perpendicularly to carbon fibres within said first and secortd carbon fibre fabric iayers.
The present invention still further provides a method for making a composite carbon fibre core comprising the steps of placing a first carbon fibre fabric layer substantiaiiy horizontally; creating a se.cond layer through the steps of placing mixed carbon fibre and epoxy materials Into a mould; and cutting layers from said mixed materials;
placing said second layer over said frr$t layer; placing a third layer of carbon fibre fabric over said second layer; and curing the combination.
The present invention yet further provides an air containment vessel comprising an inner bladder made of rubber; a structural core; an outer rubber cover; and an air outlet; whereby said inner bladder fits concentrically within said core and said core _5-fits concentrically within said outer cover, and whereby said air outiet provides fluid communication for air leaving and enterinp said vessel.
The present invention still further provides a method of making a composite carbon fibre air containment vessel having an intemal bladder, comprising the steps of creating a wax module in the shape of the inside of the air containment vessel;
inserting an air inlet tube into one end of said wax module; dipping said wax module into a liquid to form a layer of bladder material on sald wax module; allowing said layer to cure; filament winding a carbon fibre core over said bladder layer;
curing the carbon fibre core by heating, thereby also melting the wax module; dipping said carbon fibre care into liquid rubber creating an outer rubber layer; and allowing said outer rubber layer to cure.
The present invention still further provides a containment means for a pressurized fluid vessel comprising a plurality of wires wrapped about said vessel; a plurality of fastening means for securfng the ends of respective ones of said wires together, said fastening means having energy absorbing means therein to allow controlled expansion of soid wire in the event of vessel failure; and whereby each wire can be affixed at a second end to a lug using cones and stoppers within the lug.
The present invention yet further provides a protective over-wrap for a pressure vessel comprising a carbon composite thread; and a liquid rubber; wherein said carbon composite thread is immersed in said liquid rubber and subsequently wound about said pressure vessel, and wherein said pressure vessel with said carbon composite thread and liquid rubber winding are then cured.
The present invention further provides a method of creating a proteCtive over-wrap for pressure v ssels comprising the steps of saturating a carbon-composite thread In a liquld rubber compound; winding said saturated thread about said pressure vessel; and curing said pressure vessel and saturated thread; whereby said rubber and carbon composite thread comprise said protective over-wrap.
~6-BRIEF DESCREpTION OF THE DRAWINGS
Preferred embodiments of the present invention will now be described in greater detail and will be better understood when read in conjunction with the following drawings in which:
Figure 1 is a schematical view of the vest apparatus as seen from the rear;
Figure 2 is a schematical view of the vest apparatus as seen from the front;
Figure 3 is a cross sectional view of a preferred embodiment'of a high pressure vessel and fitting;
Figure 4 is a cross sectional view of a second plate and nut arrangement that may be attached to the fittings of Figure 2;
Figure 5 is a cross sectional view of a high pres$ure vessel, Figure 6 is an enlarged cross sectional vi'ew of a portion of the vessel of Figure 3;
Figure 7 is an end view of a wax module for creating the vessel of Figure 3;
Figure 8 is a side view of a wax module fpr creating the vessel of Figure 3;
Figure 9 is a perspective view of a modified shape of an air vessel including aT"
ftting;
Figure 10 is a perspective view of another embodiment of a pressure vessei, including a regulator;
Figure 11 is a schematical view of a containment bag for the vessel of Figure 3;
Figure 12 is a cross sectional view of a suppression device used in the containment bag of Figure 11;
Figure 13 is the prior art configuration of an "i-beam" balsa wood core composite;
Figure 14 is a cross section showing a new pure carbon fibre composite material;
Figure 15 is a view of a prior art regulator-valve body assembly; and Figure 16 is a cross sectional view of a vessel with a protective ovenarrap.
DETAILED DESCRIPTION OF THE DRAWINGS
The present invention consists of a compact, lightweight, self contained air breathing apparatus in the form of muitiple, high pressure vessels or vessels that are contairned within a body vest and in a preferred embodiment are designed to provide a user with at least 30 minutes of breathable air.
Referring to Figures 'i and 2, the construction of the vest apparatus I in the present invention consists of a series of distinct components that are interconnected in order to provide the functionality of the apparatus. These components include a series of high pressure vessels 10 or vessels that are Interconnected, a containment bag (Figure 11) or device to protect a user in the case of a rupture of one of the high pressure vessels, an explosion shield 65 placed within the vest and between a user and the high pressure vessels in order to further protect a user in the case of an explosion or rupture of one of the vessels, a breathing piece 49, and the vest structure I comprised of a material suited to the envisioned use of that particular vest apparatus. Further features such as pressure monitoring sensors and alarms, straps 7 for securing the vest apparatus more securely to a user, regulators, T
fittings, etc., may also be included in the vest. Each of these components and how they interconnect will be described in more detail beiow, starting with preferred air vessels used, including containment means for these vessels to allow them to be charged to a higher pressure, and then deflector ineans placed within the vest between the vessel and the user, and then the regulators, hoses, and respirators used.
The vest I uses a series of interconnected high pressure vessels 10. These vessels are illustrated in Figures 3 to 6, and in a preferred embodiment are comprised of an entirely non-metal structure to reduce their weight. Vessels 10 are discussed in greater detail below. Other metal embodiments of the vessels could also be used in the present invention, and this disclosure is not intended to limit the type of vessel that may be used within the present vest apparatus. One such vessel that is contemplated is illustrated in Figure and is made by Luxfer USA Limited.
Pressure vessels 10 are preferably chargeable to extremely high working pressures, generally within the range of 4500 - 7500 PSI. For safety, vessels 10 can be tested up to 15000 PSI. This is compared to the. prior art air vessels Which are more typically charged in the 3000-4500 PSI range.
Vessels 10 are preferably made of a carbon fibre epoxy and eomprise body portion 12 which has a rubber or nylon.coating 14 on Its inner surface and a rubber or nylon coating 16 on its outer surface. Carbon Pbre and epoxy were chosen due to strength and weight considerations. The shape of the vessel can be a traditional cylinder, or cari be more eliiptical (as shown in Figure 5) to more closely fit a user, and can range in sizes. Other possible cor,figurations are shown in. Figures 9 and 10.
The inner rubber coating or bladder 14 lis preferably used to provide strength and to avoid corrosion. Rubber removes the problem of corrosion associated with aluminum liners used currently in the art, and removes the need to tumble vessels in order to remove any corrosion. Lack of corrosion should also ensure that the strength of the vessel will not diminish from Its original design values.
The inner rubber bladder 14 Is created through the use of a wax module 20, as can be seen In Figures 7 and 8. Wax module 20 Includes inlet fittings 22, as deseribed below, and is dipped in liquid rubber and allowed to cure. An inner nylon liner can optionally be formed by rotomoulding. Aiternatively, an aluminium anodized liner can be used instead of a rubber liner.
-g_ Once cured, the wax module 20 and inner bladder 14 are mounted on a lathe and the carbon filament is wound onto bladder 14. The filament would vessel and wax module are then heated in an oven at between 200 and 450 degrees Fahrenheit, depending on the epoxy used to bond the carbon ttiaments. The heating melts the wax module 20. The wax is drained away, leaving behind the bladder lining the interior of core 12.
The core 12 and bladder 14 are then pre#'erablyx-rayed for imperfections and quality assurance. Once this is done, the outer rubber layer 16 is created by dipping the assembly into liquid rubber. This outer rubber layer 16 provides strength and prevents hazardous materials from contacting the carbon fibre core. This protects against chemicals compromising the Integrity of vessel 10.
In addition to, or instead of, outer rubber layer 16, a composite overwrap can be used. The overwrap is best seen in Figure 16. This figure shows pressure vessel 10 comprised of liner 14 and core 12. L,iner 14 can be a metal or rubber liner, as described above. Core 12 can be a carbon fibre / epoxy mixture, as disclosed above.
Core 12 allows vessel 10 to be filled to its preset pressure without rupturing.
Liner 14 may not be necessary if core 12 is comprised of stainless steel or aluminium. These rriateriais provide enough containment to be used without a liner.
Over-wrap layer 60 is wound over core 12: Over-wrap layer 60 is comprised of a carbon composite thread that is immersed in a liquid rubber. Preferably the carbon composite thread consists of Keviar37' .
The thread and rubberare then filamentwound around thevessei to a predetermined thickness. This winding may be done using a computerized lathe in order to achieve a uniform thickness about pressure vessei 10. -4noe the winding Is compiete,'pressure vessel 10 with its over-wrap layer 60 are then cured to solidify over-wrap layer 60.
The composite overwrap 60 of Figure 16 could also be used on prior art pressure vessels to strengthen and protect these Wesseis.
Over-wrap 60 helps mitigate some of the disadvantages that pressure vessels currently have. In particular, due to the high strength of KeviarTM, present over-wrap layer 60 should provide complete containrnent in the case of a failure of the pressure vessel. This should therefore protect those around the pressure vessel who might previously have been harmed by high vel'ocity fragments created by the failure of the pressure vessel. With the overwrap, pressure vessel 10 may be able to be pressurized cioserto its maximum capacity, allowing more gas to be stored within the pressure vessel.
Also, the rubber within the windings creates better impact resistance for pressure vessel 10, further protecting it. Rubbor will generally cushion an impact to the pressure vessel.
Still further, due to the rubber in the winding, the pressure vessel will be better able to withstand caustic environments, creating greater safety for those dependent on the pressure vessel.
The open end of each vessel 10 indudes an inlet fitting 22, as can be seen in Figure 3 and in -grearter detail in Figures 4 and 6. lnlet portion 22 includes iwo spaced apart stainless steel plates 24, each with a circular hole 23 in the centre. A
cyiindricai stainless steel air fitting 26 whose outer diameter fits concentrically within holes 23 in the steel plates is positioned through holes and the steel plates and air fitting 26 are then welded together at weldments 25. Steel plates 24 are arrang'ed paraliel to each otherwith the gap between them corresponding to the width of carbon fibre core 12 of vessel 10. When the carbon fibre is formed within this gap, its strength will ensure that ftting 22 will not be blown out of vessel 10 due to=the pressures involved.
This is further tested after the manufacture of the vessel by charging the vessel to considerably higher than the rated working pressure and ensuring that vessel does not rupture and air ftting 22 remains in place.
_11 The steel plate 24 disposed towards the inner surface of vessel 10 further includes two flanges 28 welded to it orformed lntegtally therewith and protruding substantially perpendicularly to steel plate 24 and into-vessel 10 and into wax module 20.
This reduces the likelihood of wax module 20 moving during the filament winding process about spindle 21 as most clearly illustrated (n Figure 8 which shows the flanges anchored in the wax.
The outer ernd of the steel air fitting 26 is threaded at 27 to allow a cap 30 Figure 8) to be added to the fitting. Threads 27 canl also be used to secure a second plate 32 with a nut 34 or a nutflock washer combination to outer steel plate 24 as shown most Clearly in figures 3 and 4.
Second plate 32 is shaped and adapted to accommodate regulator body housing 40 of a first stage regulator 44 (Figure 1) as illustrated in Figure 4. As can be seen frnm this figure, second plate 32 includes a skirt 33 with holes 37 for screws 36 that pass through the holes to connect regulator body 40 to second plate 32 for additional safety backing up the connection of rege4ator body 40 to threads 27 on fitting 26.
In operation, the vessels are charged cind with reference to Figure 1, air passes through first stage regulators 44 attached to the steel air fitting 26 of each vessel 10.
A series of low pressure lines 46 connect all of the vesseis together through the use of stainless "T or "Y' fittings 42, and a low pressure supply line 47 9s connected to a second stage regulator 48 on the front of the vest. Lines 46 and 47 are made from low pressure f[exble pneumatic hose designed to withstand the pressures under which the vest is to be tested; or they may comprise metallic hose or a metallic manifold. Although pressure vessels 10 can be disposed on both the front and back of the vest, its contemplated that in most applications, the vessels will be confined to the vesfs back.
Second stage regulator 48 of the present vest apparatus is also selected of course to withstand the pressures under which the vessels are to be tested. In a preferred embodiment, the second stage regulator will be of a quick ooupling mechanism type and will allow for the connection of multiple face masks or mouth pieces 49, i.e., one for a rescuer and one for the person being resqued. The regulator is placed on the vest in a location that allows easy and rapid connection of the face masks.
The location should also allow a user to easily read a pressure gauge on the regulator.
In a preferred embodiment the regulator will also have an alarm to signal to the user when the pressure falls below a certain level.
A respirator can be designed to easily attach to the second stage regulator.
Various types of breathing apparatus are contemplated, including a mask to fit over a users nose and mouth, a simple mouth piece, a SCUBA respirator or a clear plastic anti-fogging hood, such as those currentiy used in -the art.
Due to the high charge pressures of vesseis 1p, the vest apparatus further includes several safety features. The first is a containment bag 50 that Is secured to the outside of vessel 10. A preferred containment bag 50 is shown in Figure 11.
Containment bag 50 consists of braided steiinless steel aircraft cable 52 woven around vessel 10 to resemble a fish net, preferpbly on approximately 2.5 cm squares.
The dimensions of containment bag 50 allow vilrtually no clearance between the cable and the exterior rubber bladder 16 or overwraO 60 of vessel 10. This confines vessel 10, and in the case of an explosion or rupturk any propelled fragments are limited in size to the space between the braids. The rubber bladder 16 or overwrap 60 on the outer surface of vessel 10 should als - act to 'further suppress any flying fragments.
Cable *52 of containment bag 50 is held -in place through the use of special suppression lugs 54, a cross section of one of which is shown in Figure 12, These suppression lugs 54 are crimped at strategic; points on cable 52 to hold and tighten containment bag 50 in place. As can be seen in Figure 12, each suppr$ssion lug preferably includes three lead cones 56 and a stainless cable end anchor plug 58 to hold cable 52 within lug 54. The other end oti cable 52 is perrnanently secured to lug 54, thus creating a closed loop. In the event of a repture of vessel 10, the compression of cones 56 between plug 58 arld the end of lug 54 will dissipate energy.
The strength of cable 52, along with rubber biadder 16 or overwrap 60, should act to prevent any fragments from escaping from vessel 10. If, however, a fragment dobs escape, the present vest apparatus may further be provlded with a novel deflection shield 65 disposed between the user and the vessel.
The defection shield is comprised of a materiai-that should withstand and absorb the impact of a high speed fragment hitting it. In order to ensure that the weight and bulk of the vest apparatus is minimized, it Is furthbr desirable to ensure this deflection shield is as thin and, light in weight as possible. This is accomplished through the use of a new composite material.
Prior art for carbon composite materials lnciudes the "I-beam" configuration 70 as shown in Figure 13. This type of core is referred to as "End-Grain-Balsa", wherein the vertical portion 71 of the I-beam is balsa wood, and the horizontal portions 72 i5 above and below the "I" are applied carbon.fibre fabric.
The present deflection shield 65 (shown in Figure 14) comprises carbon fibre and high quality epoxy, providing higher impact resistance than most core materials. For this Improvement, the balsa wood core of,previous compasites is replaced with vertical carbon fibre strands 66. This core prtrferably measures between one-eighth of an inch to more than two inches in thickness depending upon the level of protection required. The carbon fibres are cpntinuous-roving, pre-impregnated tow, meaning the fibres have been previousiy impregnated in an epoxy-bath with epoxy which will begin its cure process with the in#raduction of heat and light.
The core of the present composite is preferebiy created by placing fibres in a trough approximately 6-inches wide by .6 inches deep by three feet in length. The trough has a plastic liner allowing the fibres to eWly move in the trough. The finished material can be cut to a predetermined thickness using known techniques.
The cut slices are placed on a sheet of pre-impregnated carbon fibre fabric 72. A
second layer of the fabric 72 is placed on top of the slice, creating a pure carbon fibre core material. The material is then placed in refrigerated storage unfil ready for delivery. The present invention further oontemplates using this new core for other uses besides deflection plates.
All of the above components are placed within a vest as may be seen in Figure 1.
The vest is constructed in a compartmet-talized fashidn such that the components are of sufficient capacity to allow for the easy insertion and removal of the vessels.
The number of vessels is dependant upon the size of the vessels and the physical size of a user's vest, where a child's veSt may only accommodate four vessels for example, and an extra large vest may include twelve vessels. Each compartment further allows a deflector plate 65 to be installed behind the vessel, protecting the user in case the vessel explodes or ruptures.
The compartments of the vest are evenly distributed on the back of the vest but they can also be distributed on the front and the back if desired.
In one embodiment of the present invention, the vest is constructed to incorporate a "quick connect' strap 7 under the buttoCks of a user to prevent the vest from rising and interfering with the face mask. The vest may also include a drawstring at its bottom which can be used to tighten the bottom of the vest.
Figure 1 shows vest I which includes a Series of vessels 10 located at various points along a user's back. Vessels 10 are interconnected with a series of first stage regulators 44 and hoses 46 which connect to second stage-regulator 48 on the vesYs front.
As described above, second stage regulator 48 is placer! in a(ocation that is easily accessible to a user to allow for both the connection of a respirator and to facilitate the checlung of the amount of air left in the vessels. This location would generally be at chest height and on the front of the garment.
-~~a-The vest can further include storage compartmer<ts into which the respiratorfits, such that the respirator can easily be accessed in the case of an emergency_ Other embodiments envisioned include a storage compartment for a spare mask or hood allowing the rescue of a victim during an emergency.
The material the vest is made from will depend on its intended application,*
If the vest is to be used In a fire rescue situation, the material can be the same as that presently used in fire fighting clothing, and thus be fire resistant. Conversely, if the vest is to be used in mountaineering or marine environments, it can be constructed of a insulating or waterproof fabric, The air vest device thus provides a coMpact system with a considerably longer air supply than current self contained breathing apparatus on the market. It is envisioned that the vest may be used ifor a number of applications inciuding:
fire fighting, oil i9eld and gas plant operatiDns, mining operations, underwater diving environments, search and rescue units, irzdustrial chemical processing plants, NASA, passenger aircraft personnel, police tadticai units, and anned forces world,wide_ The above-described embodiments df the present invention are meant to be iilustrative of preferred embodiments of the present invention and are not intended to limit the scope of the present inventson. Various modifications, which would be readily apparent to one skilled in the art, are Intended to be within the scope of the present invention. The only limitations'bo the scope of the present invention are set out in the following appended claims.
Claims (4)
1. A protective over-wrap for a pressure vessel comprising:
a carbon composite thread; and a liquid rubber;
wherein said carbon composite thread is immersed in said liquid rubber and subsequently wound about said pressure vessel, and wherein said pressure vessel with said carbon composite thread and liquid rubber winding are then cured.
a carbon composite thread; and a liquid rubber;
wherein said carbon composite thread is immersed in said liquid rubber and subsequently wound about said pressure vessel, and wherein said pressure vessel with said carbon composite thread and liquid rubber winding are then cured.
2. The protective over-wrap of claim 1 wherein said carbon composite thread is comprised of Kevlar.TM..
3. A method of creating a protective over-wrap for pressure vessels comprising the steps of:
saturating a carbon composite thread in a liquid rubber compound;
winding said saturated thread about said pressure vessel; and curing said pressure vessel and saturated thread;
whereby said rubber and carbon composite thread comprise said protective over-wrap.
saturating a carbon composite thread in a liquid rubber compound;
winding said saturated thread about said pressure vessel; and curing said pressure vessel and saturated thread;
whereby said rubber and carbon composite thread comprise said protective over-wrap.
4. The method of providing said protective over-wrap of claim 3 wherein said carbon composite thread is comprised of Kevlar.TM..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2634651A CA2634651C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2,343,454 | 2001-04-06 | ||
| CA 2343454 CA2343454A1 (en) | 2001-04-06 | 2001-04-06 | Breathing apparatus and components therefor |
| CA2,353,298 | 2001-07-19 | ||
| CA 2353298 CA2353298A1 (en) | 2001-07-19 | 2001-07-19 | Pressure vessel |
| CA002380974A CA2380974C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
| CA2634651A CA2634651C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002380974A Division CA2380974C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2634651A1 CA2634651A1 (en) | 2002-10-06 |
| CA2634651C true CA2634651C (en) | 2010-09-28 |
Family
ID=27171505
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002380974A Expired - Fee Related CA2380974C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
| CA2634651A Expired - Fee Related CA2634651C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002380974A Expired - Fee Related CA2380974C (en) | 2001-04-06 | 2002-04-08 | Breathing apparatus and pressure vessels therefor |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2380974C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382120A (en) * | 2022-08-29 | 2022-11-25 | 江苏海拓科技有限公司 | Real-time drive formula malleation air breathing device |
-
2002
- 2002-04-08 CA CA002380974A patent/CA2380974C/en not_active Expired - Fee Related
- 2002-04-08 CA CA2634651A patent/CA2634651C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2380974C (en) | 2008-07-08 |
| CA2634651A1 (en) | 2002-10-06 |
| CA2380974A1 (en) | 2002-10-06 |
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