EP0223808A1 - Protection hood against smokes and hypoxy. - Google Patents

Protection hood against smokes and hypoxy.

Info

Publication number
EP0223808A1
EP0223808A1 EP19860903410 EP86903410A EP0223808A1 EP 0223808 A1 EP0223808 A1 EP 0223808A1 EP 19860903410 EP19860903410 EP 19860903410 EP 86903410 A EP86903410 A EP 86903410A EP 0223808 A1 EP0223808 A1 EP 0223808A1
Authority
EP
European Patent Office
Prior art keywords
hood
tube
characterized
oxygen
wearer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19860903410
Other languages
German (de)
French (fr)
Other versions
EP0223808B1 (en
Inventor
Pierre Pelloux-Gervais
Richard Zapata
Michel Bres
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide SA
Original Assignee
Air Liquide SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR8508208 priority Critical
Priority to FR8508208A priority patent/FR2582524B1/en
Application filed by Air Liquide SA filed Critical Air Liquide SA
Publication of EP0223808A1 publication Critical patent/EP0223808A1/en
Application granted granted Critical
Publication of EP0223808B1 publication Critical patent/EP0223808B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B17/00Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
    • A62B17/04Hoods

Abstract

Cagoule de protection contre les fumées et l'hypoxie, utilisable plus particulièrement pour la protection du personnel navigant dans les aéronefs. Hood protection against smoke and hypoxia, particularly usable for the Protection of flight personnel in aircraft. Cette cagoule est caractérisée en ce qu'elle comprend, à sa base et à l'intérieur de l'enveloppe étanche, un tube fermé (3) entourant le cou du porteur et contenant une réserve d'oxygène sous pression et des moyens (11-13) pour provoquer automatiquement, lors de l'enfilage de la cagoule, la mise en communication de l'intérieur de ce tube avec une alimentation automatique du porteur de la cagoule en oxygène. This hood is characterized in that it comprises, at its base and within the sealed casing, a closed tube (3) surrounding the wearer's neck and containing a reserve of oxygen under pressure and means (11 -13) for causing automatically during donning of the hood, the inside of the communication setting of this tube with an automatic feed of the carrier of the oxygen hood.

Description

"HOOD PROTECTION AGAINST FUMES AND HYPOXIA"

The present invention relates to a protective hood against fumes and hypoxia usable in particular for the protection of the cabin crew in aircraft, comprising a sealed envelqppe forming a capping helmet wearer's head and in its lower part, means for sealing connecting the hood to the wearer's neck.

There are currently, to protect the aircrew to 1 * against accidental depressions or fumes forming in the cabins, open circuit devices which are ccmposés bottled oxygen cαtprimé, can provide about 300 liters of gas, which is connected to a conventional aircraft-type mask. These open circuit devices are effective but have the drawback of being difficult to implement, heavy and bulky. Other self-contained breathing systems operating in closed loops that provide combined protection against hypoxia altitude and smoke, usually in the form of a hood which is pushed by individuals when necessary and which is provided of sealing means in the neck. Such hood comprises on the one hand, means for injecting, inside, oxygen covering consαrmation of the individual wearing the hood and, on the other hand, means for trapping dioxide carbon fear limiting the content inside the hood.

The carbon dioxide absorption takes place by means of an absorbent of the type soda lime, lithium hydroxide, molecular sieves etc ..

The absorption efficiency depends both the absorbent product and secondly the proper flow through the bed of absorbent material, the gases contained in respiratory enclosure within the hood. currently known protective hoods are of two types namely either the static type or of the mechanical type. In the first case the absorption of carbon dioxide is made only by the cenvection movement of gas within the hood and in order to obtain a good efficiency of this absorption, the surface and the absorbent material to trap quickly become prohibitive for application in the aeronautical dαnaine. In the second case that is to say, that of a mechanical solution, it ensures the flow of gas through an absorbent bed or by means of a mechanical ventilator powered by a battery or by means of a i ejector using for example the expansion energy of the oxygen source.

All these known systems pose reliability problems, notaπment that their requested lifetime is more than 5 years, and efficiency, especially in the case of using an injector when the pressure capacity oxygen fall. In addition, such systems ccπplexité iirpose regularly checking the condition of the equipment.

The present invention aims to remedy these drawbacks by providing a particularly simple design protective hood, coπpacte, light, guaranteeing a long life, can provide oxygen for human consumption for a long period of time and allowing to obtain a very high efficiency for the pinning of the carbon dioxide. For this purpose, the protective hood according to the invention is characterized in that it comprises, at its base and within the sealed casing, a closed tube surrounding the wearer's neck and containing a reserve of oxygen under pressure and means for causing autαnatique ent when donning the hood, the ccmrunication formatting within that tube with the interior of the sealed casing in order to ensure automatic feeding of the carrier of the oxygen hood.

Next ccπplémentaire a feature of the invention the tube containing the oxygen under pressure coπprend advantageously two separate ccmpartiments preferably in series, to obtain an oxygen supply with two different flows, namely a high initial rate to achieve a rapid inflation of the hood and a lower bit rate corresponding to the normal oxygen conscπmation by the wearer. According to a preferred embodiment of the invention the hood cαπprend a second flexible outer casing, in gas-impermeable material, which is secured along its edges in a sealed manner, to the first casing and the wall of the first sealed enclosure is interrupted in at least one location to define, in said wall, an opening through which is arranged an absorbent product carbon dioxide and / or water. Below is described, by way of non-limiting examples, various embodiments of the present invention, with reference to the accompanying drawings wherein:

Figure 1 is an elevational view, partly in vertical section, of a protective hood according to the invention.

Figure 2 is a horizontal sectional view taken along the line II-II of Figure 1.

Figure 3 is an axial sectional developed view, on a larger scale, of the closed tube constituting the pressurized oxygen reserve.

Figure 4 is an elevational view, partly in vertical section, of an alternative embodiment of the protective hood according to the invention.

Figure 5 is a plan view, partially broken away of the protective hood of Figure 4.

FIG 6 is a partially sectional view of an exemplary embodiment of the invention.

Figure 7 is a sectional view of a detail of the hood of Figure 6. Figure 8 is a side view of the Figure 7 device.

The protective hood which is shown in Figures 1 and 2 comprises a casing 1 in sealing material, preferably elastic, forming a sort of headphone styling wearer's head and which cαrprend, in its front portion, a transparent portion 2 forming a visor providing vision to the outside, if the envelope 2 is not itself transparent material. This sealed envelope 1 is secured at its lower part, a tube 3, in form of a split ring surrounding the wearer's neck and constituting a reserve of oxygen. This tube 3 is integral, at its lower part, a flexible and elastic sheet 4, for example rubber, which extends horizontally. The sheet 4 which is tangent to the tube 3, is pierced in its central part a hole 5 for the passage of the head of the hood carrier through this hole.

The tube 3 may have in plan view, any suitable curve shape to surround the bearing neck. It may in particular circular or have a substantially oval shape as shown in Figure 2. The tube 3 is closed at both ends by frontal and transverse walls 6 and 7 which are arranged in the rear part of the hood, at a distance, opposite each other. The-tube 3 is advantageously subdivided by a transverse wall 8 pierced with a calibrated hole or capillary 9 into two ccπpartiments 3a and 3b. Both ccπpartiments are filled pressurized oxygen, for example from 150 da N / cm 2. The cxmpartiment 3a which is defined between the transverse wall 8 and the front face 6 may cαrmuniquer with the outside through a calibrated hole or capillary 10 which is drilled in the end wall 6 and which ccmπunique with a hollow tip forming cap 11 closing, secured by welding or by any other suitable means on the end face 6. This tip 11, of small dimensions, is arranged so as to be broken easily by a percussion device 12 autcmatiquament actuated upon insertion of the head within the hood. The percussion device may be constituted by exeπple, by a lever pivotally mounted on the tube 3 around an axis 13, one leg of which extends inwardly of the hood, so as to be repelled by the head of the person donning the hood, and a smaller branch acting on the end 11 to cause breakage thereof.

Therefore, at the beginning of the threading of the hood, the lever 12 causes the jump eπbout 11 so that pressurized oxygen content inside the tube 3 can escape inside the hood. The calibrated hole or capillary 10 to a sufficiently large diameter to provide a relatively high flow rate i.e. of about 0.06 1 / min bar, which allows to quickly inflate the hood when it is in place. This rate is higher than 0.03 1 / min bar is however sufficiently low

(Less than 0.2 1 / min bar) not empty too quickly the capacitance formed by the tube 3 so as not to cause excessive loss of gas if the threading of the hood is carried out badly (jamming or flight when crossing obstacles such as glasses, bun etc ...). The capillary or calibrated hole 9 provided in the transverse wall 8 takes over and the ability consisting ccπpartiment 3b slowly vacuum to ensure the flow necessary for the conscrrmation oxygen, either iriiniπum 1.51 / min.

It can be seen in Figure 3 that the end wall 7 which is opposite to the front wall 6 carrying the eirfaout 11, has a central recessed portion 14 in the bottom of which projects a capillary tube 15 into the interior of the cxxrparti ent 3b. This capillary tube extends outside to form a helix 16 which ectrânité is closed. This propeller 16 which is axially deformable as a function of the pressure prevailing inside the tube 3, can thus be a pressure gauge indicating the residual pressure within the tube.

Preferably the sealed casing 1 comprises a posterior portion LA_ more flexible than the remainder of the envelope, so as to constitute a sort of "lung" inflatable.

The casing 1 also contains therein a device ensuring pinning carbon dioxide. This device may be constituted, e.g., by soda lime grains which continuously rid the gas exhaled impurities and in particular of carbon dioxide by absorption thereof. The wearer of the protective hood according to the invention can thus breathe in closed circuit with a low oxygen supply. To increase the exchange surface with the absorbent material, the hood has preferably the shape of a mountain pass cαrme there is shown in the drawing. In the variant of the invention shown in Figures 4 and 5 the protection hood comprises a second flexible outer cover 18 in gas-impermeable material, which is fastened along its edges 19, 20 in a manner sealed, to the first casing 1. This fixing can be carried out by exeπple by welding. The sealed welding of the edge 19 extends along the visor 2 and it is connected to the lower tight weld 20 which extends horizontally in the upper horizontal plane tangential to the tube 3.

The internal wall of the sealed casing 1 is interrupted in at least one location, for example in the lower part of the posterior wall to delimit in this wall an opening 21 across which is disposed a pad 22 of porous material such a metallic grid or fiberglass net. In this porous material is iirmobilisé an absorbent product carbon dioxide and optionally water. The inner shell 1 and the outer casing 18 which has a larger area than the portion of the inner shell 1 it covers, and define between them two ccπpartiments namely a <xr_partiment internal 23 wherein is accommodated the head the wearer and an outer ccnçartiirient 24 of variable volume and forms a kind of "lung".

With the arrangement according to the invention the gases pass at all times during the breathing of the wearer of the hood, alternately in one direction and in the other, between the two ccπpartiinents 23 and 24, passing through the bed of absorbent material contained in the porous bed 22. during exhalation gases pass the DC-23 to c tpartiment internal external rpartiment 24, and during the inspiration the flow of gas is effected in reverse. Thus, the gas is continuously rid exhaled impurities and in particular carbon dioxide. The wearer of the protective hood according to the invention can thus breathe in closed circuit with a low oxygen supply.

6 shows a view, partially in section, of an embodiment of a hood according to the invention. In this figure, the same elements as those of the preceding figures have the same references. The casings 1 and 18 are made of polyester coated double sided flame retardant PVC. The total volume of the hood is 17 liters, 7 liters in volume 23 of the head and 10 liters for the volume 24 of the "lung". Reference numeral 121 indicates a soda-lime cartridge 22 kept in a closed housing by a fine wire mesh and coated with a protective plate 122 provided with a system of side openings to allow passage of air from the headspace 23 in the lungs 24 through the soda lime 22 which rid the air of the excess water and carbon dioxide. Volumes 23 and 24 are sealed relative to each other and the airflow is necessarily carried out by the lime cartridges sodées (two in number in this example). The lever 12, which has the form of a pallet is placed above the opening 5. The opening system of the oxygen capacity 3, which here has only one volume, is shown in Figure 7. the hollow tip 11 is integral with a cylindrical cap 108 whose inner side wall 100 carries, at its base, lugs 107 cooperating with the annular groove 106 carried by the front wall 6. the lever 12 is secured to the said wall 100 . eπbσut the hollow 11 has a circular groove 103. When threading the hood, the rotation of the vane 12 causes rotation of the cylindrical cap 108 around the Yi axis, which causes the rupture of the hollow tip 11 at the groove 103, the axis XX of said eπfaout YY parallel to but remote therefrom.

The oxygen present in the reservoir 3 having only ccπpartiirent is released through the nozzle 10, the housing 101 and the pipe 102. For example, the nozzle 10 to a diaπÊtre 6/100 πm releasing of 40 liters of oxygen stored under 150 bar in the reservoir 3. the autonomy of such a hood is about 15 minutes.

8 shows a side view of the device of Figure 7 clearly can be seen in this figure the shape of the piece 109, integral with the plate 12 and the cap 108 which cooperates with the end of the part 11 to cause it break. This part 109 has a semi-circular surface with a diameter through the axis YY. It cαπporte under this axis (in the figure) a semicircular notch 110 of the same diameter as the part 11 in which it comes to rest when the lever 12 is in the rest position. The rotation of the pallet (to the right in the figure) around the point 0 (YY axis) causes the tearing of the end of the workpiece 11 located before the groove 103, the same length as the thickness of the workpiece 109 and the release of oxygen through pipe 102.

Claims

CLAIMS 1. A hood for protection against fumes and hypoxia, comprising a sealed envelope, forming headphone styling the wearer's head, and, in its lower part, means for sealing connecting the hood to the wearer's neck, characterized in that it comprises, at its base and within the sealed casing, a closed tube (3) surrounding the wearer's neck and containing a reserve of oxygen under pressure and means (11-13) for causing automatically, when threading the hood, the placing in communication the interior of the tube with the interior of the sealed casing (1) so as to ensure automatic feeding of the carrier of the oxygen hood.
2. A protective hood according to claim 1 characterized in that the tube (3) in the form of a split ring closed off at its two opposite ends by frontal and transverse walls (6, 7).
3.- protection hood according to one of the preceding claims characterized in that the tube containing the oxygen under pressure comprises two separate compartments (3a, 3b) for obtaining an oxygen supply with two different flow rates, in namely a high initial rate to achieve a rapid inflation of the hood, then a lower bit rate corresponding to the normal oxygen consumption of the wearer.
4.- protection hood according to claim 3 characterized in that the tube (3) contains a transverse partition (8) separating the two compartments (3a, 3b) and which is traversed by a capillary or calibrated hole (9) smaller diameter than that of a capillary or calibrated hole (10) drilled in an end wall (6) of the tube (3) and closed by a removable closure member (11).
5.- protection hood according to claim 4 characterized in that the removable closure member (11) is actuated by a lever (12) pivoting about an axis (13) and whose one leg extends toward the inside the hood so as to be rejected by the head of the person donning the hood.
6.- protection hood according to any one of claims 4 and 5 characterized in that the removable closure member (11) is constituted by a tear-off endpiece. 1.- protective hood according to any one of claims 4 to 6 characterized in that the front wall (7) opposite to the front wall (6) carrying the tip (11) has a recessed central portion (14) in the bottom of which projects a capillary tube (15) opening inside the ccmpart-ment (3b), this capillary tube extends outside by forming a helix (16) whose end is closed and which is axially deformable as a function of the pressure prevailing inside the tube (3), to thereby constitute a pressure gauge indicating the residual pressure within the tube (3). 8. A protection hood according to one of the preceding claims characterized in that it comprises a second flexible outer casing (3), impervious to gases, which is secured along its edges (4, 5), of a sealed manner, to the first casing (1) and the wall of the first inner sealed casing (1) is interrupted in at least one location to define in this wall an opening (6) through which is arranged a mat (7 ) of porous material wherein is iirmobilisé an absorbent product carbon dioxide and / or water.
EP19860903410 1985-05-31 1986-05-28 Protection hood against smokes and hypoxy Expired - Lifetime EP0223808B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8508208 1985-05-31
FR8508208A FR2582524B1 (en) 1985-05-31 1985-05-31 Hood to protect against fumes and hypoxia

Publications (2)

Publication Number Publication Date
EP0223808A1 true EP0223808A1 (en) 1987-06-03
EP0223808B1 EP0223808B1 (en) 1990-08-01

Family

ID=9319734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860903410 Expired - Lifetime EP0223808B1 (en) 1985-05-31 1986-05-28 Protection hood against smokes and hypoxy

Country Status (8)

Country Link
US (1) US4889113A (en)
EP (1) EP0223808B1 (en)
JP (1) JPH0720496B2 (en)
CA (1) CA1296236C (en)
DE (1) DE3673132D1 (en)
ES (1) ES8704743A1 (en)
FR (1) FR2582524B1 (en)
WO (1) WO1986006971A1 (en)

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US5113854A (en) * 1990-01-25 1992-05-19 Figgie International, Inc. Quick-donning protective hood assembly
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US5186165A (en) * 1991-06-05 1993-02-16 Brookdale International Systems Inc. Filtering canister with deployable hood and mouthpiece
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US6701920B1 (en) * 2000-06-02 2004-03-09 Gerald L. Cox Head enclosing gas hood
US20030136411A1 (en) * 2001-07-03 2003-07-24 Ming-Mei Hsieh Portable life mask
US6892725B2 (en) * 2002-04-26 2005-05-17 Mine Safety Appliances Company Protective hoods and neck seals for use therein
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WO2006062548A1 (en) * 2004-06-21 2006-06-15 Humanscale Corporation Air purifying escape hood
US7225806B2 (en) * 2004-10-29 2007-06-05 Jamcet Innovations, Llc Portable oxygen regenerating escape hood
US20110030114A1 (en) * 2009-08-04 2011-02-10 Chicago Protective Apparel, Inc. Arc flash protection system
CA2775755C (en) * 2009-09-30 2017-12-12 Essex P.B. & R. Corp. Emergency breathing apparatus
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DE102012213288A1 (en) * 2012-07-27 2014-05-15 Uvex Sports Gmbh & Co. Kg Avalanche safety helmet
FR3006899B1 (en) * 2013-06-12 2015-05-29 Air Liquide Hood respirator
FR3006900B1 (en) * 2013-06-12 2015-05-29 Air Liquide Respiratory Protection
FR3024370B1 (en) * 2014-08-01 2016-07-22 Air Liquide Hood respirator
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Also Published As

Publication number Publication date
JPH0720496B2 (en) 1995-03-08
ES555517D0 (en)
CA1296236C (en) 1992-02-25
ES555517A0 (en) 1987-04-16
DE3673132D1 (en) 1990-09-06
EP0223808B1 (en) 1990-08-01
ES8704743A1 (en) 1987-04-16
FR2582524B1 (en) 1989-01-13
WO1986006971A1 (en) 1986-12-04
FR2582524A1 (en) 1986-12-05
US4889113A (en) 1989-12-26
JPS62503014A (en) 1987-12-03

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