EP0781573B1 - Head element with pressure regulated zones - Google Patents

Head element with pressure regulated zones Download PDF

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Publication number
EP0781573B1
EP0781573B1 EP96402832A EP96402832A EP0781573B1 EP 0781573 B1 EP0781573 B1 EP 0781573B1 EP 96402832 A EP96402832 A EP 96402832A EP 96402832 A EP96402832 A EP 96402832A EP 0781573 B1 EP0781573 B1 EP 0781573B1
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EP
European Patent Office
Prior art keywords
pressure
cavity
seal
head gear
mask
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Expired - Lifetime
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EP96402832A
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German (de)
French (fr)
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EP0781573A1 (en
Inventor
Robert Schegerin
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Safran Aerosystems SAS
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Intertechnique SA
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/04—Gas helmets

Definitions

  • the main challenge today is to design and then integrate a flexible mask that can accept high overpressures (greater than 100 hectoPascal) without leakage.
  • the faces are very different from each other and experience shows that the difficulty of sealing a mask increases exponential when the pressure to maintain in the mask increases. Indeed, it is relatively easy to seal a mask for a pressure from 30 to 60 hectoPascal, difficult to quench for a pressure from 60 to 90 hectoPascal and practically impossible to seal a mask for internal pressures between 120 and 150 hectoPascal.
  • calibrated passages between the cavities C1, C2 and C3 exist and allow a gas flow calibrated ensuring ventilation of the entire head.
  • the means openings exist to separate the facial assembly from the head element comprising at least the mask M, of the rest of the leading element at the option of the wearer.
  • the means automatic devices trigger, at least partially, on contact with water the opening of the facial part comprising at least the mask M.
  • At least one of two calibrated leaks are orifices with variable diameter depending on the pressure P1 so that the ventilation air flow is substantially constant whatever the pressure P1.
  • At least one of two calibrated leaks includes a variable section orifice adjustable by the pilot.
  • the means M3 is such that it can be adjusted by the pilot so that the pressure P3 is adjustable by the pilot.
  • a subject 1 is placed inside a head element 2.
  • This head element consists of a helmet C, a transparent visor V at eye level and an M mask covering the mouth and nose.
  • the mask once placed on the wearer's face, defines a cavity C1.
  • the front part of the head element comprising at least the eyes defines a C2 cavity.
  • a joint J1 isolates the cavity C1 from the cavity C2.
  • This J1 joint is continuous and completely "contained" in the cavity C2, so that the pressure P1 prevailing in the cavity C1 is isolated from the pressure P2 prevailing in the C2 by the seal J1.
  • a helmet C surrounds the rest of the wearer's head.
  • the C3 cavity is the space between the helmet C, the wearer's head, the seal J2 and a J3 neck seal.
  • the pressure prevailing in this cavity is equal to P3.
  • the joint J2 is continuous and closes on itself. This joint insulates the cavity C2 of the cavity C3.
  • the J3 seal is continuous and closes on itself. This joint insulates the cavity C3 of the ambient medium.
  • a pipe 3 brings the breathable gas under a pressure PA.
  • An inspiratory valve 4 with very low pressure drop allows passage in one direction of the breathing gas.
  • Volume C1 is minimized to reduce the dead volume of the mask and improve the flow of CO2 to the outside.
  • a compensated exhalation valve allows exhalation in the environment (which is at PE pressure) whatever the pressure PA admission.
  • a mechanical or electrical regulator regulates the pressure P2 by function of the pressure PA which is substantially equal to P1, following by example the setpoint defined in figure 3.
  • An F1 calibrated leak allows a slight flow to pass to ventilate, refresh the face and demister the visor.
  • a leak calibrated F2 allows a slight flow to pass through the C3 cavity to ventilate the head.
  • a calibrated valve 7 makes it possible to maintain a slight pressure P3 in the cavity C3.
  • the table in FIG. 4 gives an example of the pressures which could be chosen.

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Description

Aujourd'hui les éléments de têtes ont besoin d'être de plus en plus performants. Ils doivent être souvent étanches aux contaminants contenus dans l'atmosphère et maintenir des pressions internes de plus en plus grandes notamment pour les applications aéronautiques.Today the elements of heads need to be more and more more efficient. They must often be impervious to contaminants contained in the atmosphere and maintain more internal pressures larger in particular for aeronautical applications.

Il existe de nombreux produits permettant d'assurer certaines protections physiologiques des sujets, mais peu d'exemples existent où il est possible de combiner plusieurs protections physiologiques efficaces dans le même ensemble.There are many products to ensure certain physiological protections of the subjects, but few examples exist where it is possible to combine several physiological protections effective in the same package.

La principale difficulté actuelle est de concevoir, puis d'intégrer un masque souple pouvant accepter des surpressions élevées (supérieures à 100 hectoPascal) sans fuite.The main challenge today is to design and then integrate a flexible mask that can accept high overpressures (greater than 100 hectoPascal) without leakage.

En fait, lorsque l'on désire maintenir une forte pression interne de masque, on est obligé de maintenir fortement le masque sur le visage du porteur. Ceci induit une boursouflure de la joue qui nuit fortement à la performance du joint qui alors se met à fuir.In fact, when one wishes to maintain a strong internal pressure of mask, we are obliged to strongly maintain the mask on the face of the carrier. This induces a blistering of the cheek which strongly harms the performance of the seal which then begins to leak.

D'autre part, les visages sont très différents les uns des autres et l'expérience montre que la difficulté d'étancher un masque croít de façon exponentielle lorsque la pression à maintenir dans le masque augmente. En effet, il est relativement facile d'étancher un masque pour une pression de 30 à 60 hectoPascal, difficile de l'étancher pour une pression de 60 à 90 hectoPascal et pratiquement impossible d'étancher un masque pour des pressions internes comprises entre 120 et 150 hectoPascal.On the other hand, the faces are very different from each other and experience shows that the difficulty of sealing a mask increases exponential when the pressure to maintain in the mask increases. Indeed, it is relatively easy to seal a mask for a pressure from 30 to 60 hectoPascal, difficult to quench for a pressure from 60 to 90 hectoPascal and practically impossible to seal a mask for internal pressures between 120 and 150 hectoPascal.

L'invention proposée ici permet de résoudre ce problème. Le brevet français n° 76 39 294 de 1976 (= FR-A-2 375 873) propose un ensemble de solutions permettant de pressuriser indépendamment les oreilles et les yeux. Il n'est nullement proposé d'intégrer le masque dans le compartiment visière et donc d'améliorer le comportement du joint d'étanchéité du masque en réduisant la pression différentielle existant de chaque côté du joint et en tirant la peau de la joue pour améliorer l'étanchéité entre la lèvre du masque et la peau de la joue. The invention proposed here solves this problem. French patent n ° 76 39 294 of 1976 (= FR-A-2 375 873) proposes a set of solutions to independently pressurize the ears and eyes. It is not at all proposed to integrate the mask in the visor compartment and thus improve the behavior of the seal sealing the mask by reducing the existing differential pressure on each side of the joint and pulling the skin of the cheek to improve the seal between the lip of the mask and the skin of the cheek.

Certains ont proposé de placer des joints gonflables pour étancher le masque. Malheureusement, une fois gonflé le joint est très rigide et ne peut suivre les formes complexes tridimensionnelles du visage et les résultats sont très médiocres.Some have proposed placing inflatable seals for seal the mask. Unfortunately, once inflated the joint is very rigid and cannot follow the complex three-dimensional shapes of the face and the results are very poor.

Un but de l'invention est de réaliser un élément de tête assurant certaines fonctions de protection physiologique de la tête dans une ambiance contaminée et/ou à taux faible d'oxygène où

  • les pressions exprimées en hectoPascal sont des pressions différentielles entre la pression absolue de la zone considérée et la pression absolue de l'atmosphère ambiante.
  • les pressions exprimées en bar sont des pressions absolues.
An object of the invention is to provide a head element providing certain functions of physiological protection of the head in a contaminated environment and / or at a low oxygen level where
  • the pressures expressed in hectoPascal are differential pressures between the absolute pressure of the zone considered and the absolute pressure of the ambient atmosphere.
  • the pressures expressed in bar are absolute pressures.

Un but de l'invention est de réaliser un élément de tête léger et peu coûteux assurant certaines fonctions de protection physiologiques de la tête dans une ambiance contaminée et/ou à taux faible d'oxygène. Ces buts sont atteints par le procédé selon l'invention qui est essentiellement caractérisée en ce qu'il consiste en un élément de tête comprenant au moins trois cavités appelées C1, C2 et C3 définissant trois volumes V1, V2 et V3 où :

  • C1 est une cavité définie par un masque M incluant la bouche et le nez;
  • C2 est une cavité définie par la face avant de l'élément de tête et incluant au moins les yeux du porteur;
  • C3 est une cavité définie par le reste de l'élément de tête et incluant la grande partie du cuir chevelu;
et où
  • trois joints J1, J2 et J3 isolent les trois cavités C1, C2 et C3;
  • ces trois joints sont continus et se referment sur eux-mêmes;
  • le joint J1 isole la cavité C1 de la cavité C2, le joint J2 isole la cavité C2 de la cavité C3 et le joint J3 isole la cavité C3 de l'atmosphère environnante;
et où
  • au moins un moyen M1 faisant partie du masque permet de réguler la pression désirée P1 dans la cavité C1;
  • au moins un moyen M2 permet de réguler la pression P2 dans la cavité C2;
  • au moins un moyen M3 permet de réguler la pression P3 dans la cavité C3;
et où
  • en général la pression P1 est supérieure à la pression P2;
  • en général la pression P2 est supérieure à la pression P3;
et où
  • la pression P2 régulée par le moyen M2 est une fonction continue croissante de la pression P1 de telle sorte que la pression P2 régulée soit pratiquement toujours inférieure à la pression P1 et que la pression P2 ait une valeur intermédiaire comprise entre la pression P1 et la pression P3;
et où
  • en tout endroit du joint J1 la pression différentielle régnant de chaque côté de ce joint est égale à ΔP1 qui est égale à P1-P2;
et où
  • en tout endroit du joint J2 la pression différentielle régnant de chaque côté de ce joint est égale à ΔP2 qui est égale à P3-P2;
et où
  • le joint J2 est placé de telle sorte qu'il crée une tension de la peau des joues diminuant le bourrelet de la peau des joues au droit du joint J1.
An object of the invention is to provide a light and inexpensive head element ensuring certain physiological protection functions of the head in a contaminated environment and / or at a low oxygen level. These aims are achieved by the method according to the invention which is essentially characterized in that it consists of a head element comprising at least three cavities called C1, C2 and C3 defining three volumes V1, V2 and V3 where:
  • C1 is a cavity defined by a mask M including the mouth and the nose;
  • C2 is a cavity defined by the front face of the head element and including at least the eyes of the wearer;
  • C3 is a cavity defined by the rest of the head element and including the large part of the scalp;
and or
  • three joints J1, J2 and J3 isolate the three cavities C1, C2 and C3;
  • these three joints are continuous and close on themselves;
  • the joint J1 isolates the cavity C1 from the cavity C2, the joint J2 isolates the cavity C2 from the cavity C3 and the joint J3 isolates the cavity C3 from the surrounding atmosphere;
and or
  • at least one means M1 forming part of the mask makes it possible to regulate the desired pressure P1 in the cavity C1;
  • at least one means M2 makes it possible to regulate the pressure P2 in the cavity C2;
  • at least one means M3 makes it possible to regulate the pressure P3 in the cavity C3;
and or
  • in general the pressure P1 is greater than the pressure P2;
  • in general the pressure P2 is greater than the pressure P3;
and or
  • the pressure P2 regulated by the means M2 is a continuous increasing function of the pressure P1 so that the pressure P2 regulated is almost always lower than the pressure P1 and that the pressure P2 has an intermediate value between the pressure P1 and the pressure P3;
and or
  • in any place of the joint J1 the differential pressure prevailing on each side of this joint is equal to ΔP1 which is equal to P1-P2;
and or
  • at any point of the joint J2 the differential pressure prevailing on each side of this joint is equal to ΔP2 which is equal to P3-P2;
and or
  • the joint J2 is placed so that it creates a tension of the skin of the cheeks decreasing the bead of the skin of the cheeks in line with the joint J1.

Selon un mode de réalisation avantageux des passages calibrés entre les cavités C1,C2 et C3 existent et permettent un débit de gaz calibré assurant la ventilation de l'ensemble de la tête.According to an advantageous embodiment of the calibrated passages between the cavities C1, C2 and C3 exist and allow a gas flow calibrated ensuring ventilation of the entire head.

Selon un mode de réalisation avantageux des moyens d'ouvertures existent permettant de désolidariser l'ensemble facial de l'élément de tête comprenant au moins le masque M, du reste de l'élément de tête au gré du porteur.According to an advantageous embodiment of the means openings exist to separate the facial assembly from the head element comprising at least the mask M, of the rest of the leading element at the option of the wearer.

Selon un mode de réalisation avantageux des moyens automatiques actifs déclenchent, au moins partiellement, au contact de l'eau l'ouverture de la partie faciale comprenant au moins le masque M.According to an advantageous embodiment of the means automatic devices trigger, at least partially, on contact with water the opening of the facial part comprising at least the mask M.

Selon un mode de réalisation avantageux au moins une des deux fuites calibrées sont des orifices à diamètre variable en fonction de la pression P1 de telle sorte que le débit d'air de ventilation soit sensiblement constant quelque soit la pression P1. According to an advantageous embodiment at least one of two calibrated leaks are orifices with variable diameter depending on the pressure P1 so that the ventilation air flow is substantially constant whatever the pressure P1.

Selon un mode de réalisation avantageux au moins une des deux fuites calibrées comprend un orifice à section variable réglable par le pilote.According to an advantageous embodiment at least one of two calibrated leaks includes a variable section orifice adjustable by the pilot.

Selon un mode de réalisation avantageux le moyen M3 est tel qu'il puisse être réglé par le pilote de telle sorte que la pression P3 soit ajustable par le pilote.According to an advantageous embodiment, the means M3 is such that it can be adjusted by the pilot so that the pressure P3 is adjustable by the pilot.

L'invention sera mieux comprise par la description détaillée d'un mode de réalisation illustré sur les dessins annexés qui représentent respectivement ;

  • figure 1 : représente un élément de tête comportant un masque (M) intégré dans une visière (V), la visière étant partie intégrante du casque (C) ;
  • figure 2 : représente une coupe verticale passant sensiblement par le centre de la tête et montrant schématiquement une solution simple de régulation des pressions P1, P2 et P3 ;
  • figure 3 : représente un exemple de valeur de la pression régulée P2 en fonction de la pression PA ;
  • figure 4 : représente des exemples d'évolution des pression P1, P2 et P3 en fonction de la pression PA.
The invention will be better understood from the detailed description of an embodiment illustrated in the accompanying drawings which represent respectively;
  • Figure 1 : shows a head element comprising a mask (M) integrated in a visor (V), the visor being an integral part of the helmet (C);
  • FIG. 2 : represents a vertical section passing substantially through the center of the head and schematically showing a simple solution for regulating the pressures P1, P2 and P3;
  • FIG. 3 : represents an example of the value of the regulated pressure P2 as a function of the pressure PA;
  • Figure 4 : shows examples of changes in pressure P1, P2 and P3 as a function of the pressure PA.

La description détaillée d'un mode de réalisation se réfère aux figures 1 et 2.The detailed description of an embodiment refers to Figures 1 and 2.

Un sujet 1 est placé à l'intérieur d'un élément de tête 2.. Cet élément de tête se compose d'un casque C, d'une visière V transparente au niveau des yeux et d'un masque M couvrant la bouche et le nez. Le masque, une fois mis en position sur la face du porteur, définit une cavité C1. La partie frontale de l'élément de tête comprenant au moins les yeux définit une cavité C2. Un joint J1 isole la cavité C1 de la cavité C2. Ce joint J1 est continu et complètement "contenu"dans la cavité C2, de telle sorte que la pression P1 régnant dans la cavité C1 soit isolée de la pression P2 régnant dans la C2 par le joint J1. Ces deux pressions P1 et P2 existent sur tout le pourtour du joint J1 qui est continu et qui se referme sur lui-même.A subject 1 is placed inside a head element 2. This head element consists of a helmet C, a transparent visor V at eye level and an M mask covering the mouth and nose. The mask, once placed on the wearer's face, defines a cavity C1. The front part of the head element comprising at least the eyes defines a C2 cavity. A joint J1 isolates the cavity C1 from the cavity C2. This J1 joint is continuous and completely "contained" in the cavity C2, so that the pressure P1 prevailing in the cavity C1 is isolated from the pressure P2 prevailing in the C2 by the seal J1. These two pressures P1 and P2 exist all around the joint J1 which is continuous and which closes on itself.

Un casque C entoure le reste de la tête du porteur. La cavité C3 est l'espace compris entre le casque C, la tête du porteur, le joint J2 et un joint de cou J3. La pression régnant dans cette cavité est égale à P3. A helmet C surrounds the rest of the wearer's head. The C3 cavity is the space between the helmet C, the wearer's head, the seal J2 and a J3 neck seal. The pressure prevailing in this cavity is equal to P3.

Le joint J2 est continu et se referme sur lui-même. Ce joint isole la cavité C2 de la cavité C3.The joint J2 is continuous and closes on itself. This joint insulates the cavity C2 of the cavity C3.

Le joint J3 est continu et se referme sur lui-même. Ce joint isole la cavité C3 du milieu ambiant.The J3 seal is continuous and closes on itself. This joint insulates the cavity C3 of the ambient medium.

Un tuyau 3 amène le gaz respirable sous une pression PA.A pipe 3 brings the breathable gas under a pressure PA.

Une soupape inspiratoire 4 à très faible perte de charge permet le passage dans une direction du gaz respirable.An inspiratory valve 4 with very low pressure drop allows passage in one direction of the breathing gas.

Le volume C1 est minimisé pour réduire le volume mort du masque et améliorer l'écoulement du CO2 vers l'extérieur.Volume C1 is minimized to reduce the dead volume of the mask and improve the flow of CO2 to the outside.

Une soupape expiratoire compensée permet d'expirer dans l'environnement (qui est à une pression PE) quelle que soit la pression d'admission PA.A compensated exhalation valve allows exhalation in the environment (which is at PE pressure) whatever the pressure PA admission.

Un régulateur mécanique ou électrique régule la pression P2 en fonction de la pression PA qui est sensiblement égale à P1, suivant par exemple la consigne définie par la figure 3.A mechanical or electrical regulator regulates the pressure P2 by function of the pressure PA which is substantially equal to P1, following by example the setpoint defined in figure 3.

Une fuite calibrée F1 permet de laisser passer un léger débit pour ventiler, rafraíchir la face et désembuer la visière.An F1 calibrated leak allows a slight flow to pass to ventilate, refresh the face and demister the visor.

Une fuite calibrée F2 permet de laisser passer un léger débit dans la cavité C3 pour ventiler la tete.A leak calibrated F2 allows a slight flow to pass through the C3 cavity to ventilate the head.

Une soupape tarée 7 permet de maintenir une légère pression P3 dans la cavité C3.
Pour une application aéronautique typique, le tableau de la figure 4 donne un exemple des pressions qui pourrait être choisies.A calibrated valve 7 makes it possible to maintain a slight pressure P3 in the cavity C3.
For a typical aeronautical application, the table in FIG. 4 gives an example of the pressures which could be chosen.

On voit que la disposition choisie dans ce cas particulier permet de maintenir une pression dans le masque, par exemple de 145 hectoPascal, en ayant un joint de masque J1 qui ne subit qu'une pression différentielle P1 égale à 145 moins 70 soient 75 hectoPascal. Ce joint de masque peut alors être conçu avec des matériaux et des technologies accessibles. D'autre part, le joint J2 subit une différence de pression égale à P2-P3, soit dans le cas choisi, 65 = 70 - 5 hectoPascal. On voit aussi que le joint J2 tire la peau des joues vers l'arrière ce qui augmente la tension des joues et améliore encore les caractéristiques d'étanchéité du joint de masque J1. We see that the arrangement chosen in this particular case allows maintain a pressure in the mask, for example 145 hectoPascal, by having a mask seal J1 which undergoes only one pressure differential P1 equal to 145 minus 70, i.e. 75 hectoPascal. This joint of mask can then be designed with materials and technologies accessible. On the other hand, the J2 seal undergoes a pressure difference equal to P2-P3, or in the chosen case, 65 = 70 - 5 hectoPascal. We see also that the J2 joint pulls the skin of the cheeks back which increases cheek tension and further improves characteristics mask seal J1.

Il est à remarquer que certaines parties du masque, de la visière et/ou du casque peuvent être communes sans changer le concept, ni la performance du système . Le lecteur comprendra aisément que de nombreuses variantes de ce concept sont facilement réalisables. Les applications sont également nombreuses dès que l'on veut isoler la tête d'un porteur du milieu ambiant de façon optimale.It should be noted that certain parts of the mask, of the visor and / or the helmet can be common without changing the concept or the system performance. The reader will easily understand that many variations of this concept are readily achievable. The there are also many applications when you want to isolate the head of an environment carrier optimally.

Claims (7)

  1. Head gear for an airplane pilot providing certain functions of physiological head protection in a contaminated ambient atmosphere at a low oxygen concentration, said head gear comprising at least three cavities C1, C2, C3 defining three volumes V1, V2 and V3,
    where:
    C1 is a cavity defined by a mask M, including the mouth and nose;
    C2 is a cavity defined by the front surface of the head gear and including at least the eyes of the wearer;
    C3 is a cavity defined by the valance of the head gear and including the major portion of the scalp ;
    and where
    three seals J1, J2 and J3 isolate the three cavities C1, C2 and C3;
    the three seals are continuous and closed;
    Seal J1 separates cavity C1 from cavity C2, Seal J2 separates cavity C2 from cavity C3, Seal J3 separates cavity C3 from the surrounding atmosphere;
    and where
    at least a means M1 which is part of the mask enables regulation of the desired pressure P1 in cavity C1;
    at least a means M2 enables regulation of pressure P2 in cavity C2;
    at least a means M3 enables regulation of pressure P3 in cavity C3;
    and where
    typically pressure P1 is higher than pressure P2;
    typically pressure P2 is higher than pressure P3;
    and where
    pressure P2 regulated by means M2 is a continuous increasing function of pressure P1, whereby regulated pressure P2 is practically always higher than pressure P1 and pressure P2 has a value which is intermediate between pressure P1 and pressure P3;
    and where
    at any place of seal J1, the differential pressure prevailing on each side of that seal is equal to ΔP1 which is equal to P1-P2;
    and where
    at any place of seal J2, the differential pressure prevailing on each side of that seal is equal to ΔP2 which is equal to P3-P2;
    and where
    seal J2 is so located that it generates a tension of the skin of the cheeks which decreases the bulge of the cheek skin in the front of seal J1;
  2. Head gear according to claim 1, characterized in that calibrated passages between cavities C1, C2 and C3 are provided and authorize a calibrated gas flow for ventilation of the head as a whole.
  3. Head gear according to claims 1 and 2, characterized in that opening means exist which permit to separate the face assembly of the head gear comprising at least the mask M from the balance of the head gear at the wearer's will.
  4. Head gear according to claim 3, characterized in that active automatic means trigger, responsive to contact with water, at least partial opening of the face portion comprising at least mask M.
  5. Head gear according to claim 2, characterized in that at least one of the two calibrated passages are ports having a diameter which is variable responsive to pressure P1, whereby the flow of ventilation air is substantially constant whatever the pressure P1.
  6. Head gear according to claim 2, characterized in that at least one of the two calibrated leak passage comprises a port having a cross-section which is variable and adjustable by the pilot.
  7. Head gear according to any one of claims 1-6, characterized in that means M3 is such that it can be adjusted by the pilot whereby pressure P3 is adjustable by the pilot.
EP96402832A 1995-12-21 1996-12-19 Head element with pressure regulated zones Expired - Lifetime EP0781573B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9515233A FR2742667B1 (en) 1995-12-21 1995-12-21 HEAD ELEMENT WITH REGULATED PRESSURE AREAS, ESPECIALLY FOR AIRCRAFT PILOTS
FR9515233 1995-12-21

Publications (2)

Publication Number Publication Date
EP0781573A1 EP0781573A1 (en) 1997-07-02
EP0781573B1 true EP0781573B1 (en) 2001-11-07

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EP96402832A Expired - Lifetime EP0781573B1 (en) 1995-12-21 1996-12-19 Head element with pressure regulated zones

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US (1) US5794260A (en)
EP (1) EP0781573B1 (en)
DE (1) DE69616727T2 (en)
FR (1) FR2742667B1 (en)

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Publication number Priority date Publication date Assignee Title
FR2766723A1 (en) * 1997-07-31 1999-02-05 Ti France Breathing mask for toxic environments
CA2223345A1 (en) 1997-12-03 1999-06-03 Bombardier Inc. Full face helmet with breathing mask
CA2422394A1 (en) * 2002-03-12 2003-09-12 Bombardier Inc. Breathing mask adjuster
GB0406291D0 (en) 2004-03-19 2004-04-21 Scott Health & Safety Ltd Respirators
FR2879469A1 (en) * 2004-12-21 2006-06-23 Robert Schegerin Head protection assembly for use by military aircraft pilot, has tube connecting inlet chamber of compensated exhaling valve to downstream of inspiratory valve and comprising inner volume which is large in order to create buffer volume
US7694353B2 (en) * 2005-11-23 2010-04-13 Brian Weston Air circulation system for protective helmet and helmet containing the same
AU2009231952B2 (en) * 2008-04-04 2012-01-12 3M Innovative Properties Company Lens seal for headgear

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FR2639545B1 (en) * 1988-11-29 1991-02-22 Intertechnique Sa INDIVIDUAL RESPIRATORY AND PROTECTIVE EQUIPMENT IN CONTAMINATED ATMOSPHERE

Also Published As

Publication number Publication date
EP0781573A1 (en) 1997-07-02
DE69616727T2 (en) 2002-08-22
FR2742667A1 (en) 1997-06-27
FR2742667B1 (en) 1998-02-06
DE69616727D1 (en) 2001-12-13
US5794260A (en) 1998-08-18

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