CA1230701A - Protective apparatus - Google Patents
Protective apparatusInfo
- Publication number
- CA1230701A CA1230701A CA000463396A CA463396A CA1230701A CA 1230701 A CA1230701 A CA 1230701A CA 000463396 A CA000463396 A CA 000463396A CA 463396 A CA463396 A CA 463396A CA 1230701 A CA1230701 A CA 1230701A
- Authority
- CA
- Canada
- Prior art keywords
- oxygen
- head portion
- supply
- protective apparatus
- atmosphere
- 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.)
- Expired
Links
Landscapes
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The protective covering has a helmet part and a body part at least partly covering the body. An oxygen cartridge is screwed in a connection member on the chest portion of the body part and a cartridge opener is displaceably mounted therein to open the sealed oxygen cartridge when an actuating cord attached to an actuating lever is pulled. The oxygen is reduced to a lower pressure in a metering throttle and conducted to the helmet part with constant circulation.
Using the oxygen cartridge as the oxygen source provides a simple and cost-effective solution to enable the protective covering to be used even in a harmful gas atmosphere as effective protection for the wearer.
The protective covering has a helmet part and a body part at least partly covering the body. An oxygen cartridge is screwed in a connection member on the chest portion of the body part and a cartridge opener is displaceably mounted therein to open the sealed oxygen cartridge when an actuating cord attached to an actuating lever is pulled. The oxygen is reduced to a lower pressure in a metering throttle and conducted to the helmet part with constant circulation.
Using the oxygen cartridge as the oxygen source provides a simple and cost-effective solution to enable the protective covering to be used even in a harmful gas atmosphere as effective protection for the wearer.
Description
3~701 , -~M0*3~UND cr Tll~ J~ION---, ~, ~ .
This invention relates to a protective apparatus, and, more particularly, to a protective apparatus comprising a head portion for covering the head and a body portion for covering at least part of the body~
Various designs of protective coverings are known. They are worn by a wearer as protection against external conditions in cases of emergency and accident, such as fires, dust generation and explosions. Protective coverings of this kind also serve as breathing apparatus since, in situations of this kind, the composition of the atmosphere usually changes, making normal respiration uncertain.
A known protective covering consists of a cloth-like material and may be wcrn over normal clothing. As it is the head which is most at risk in the above-mentioned situations, the protective covering primarily covers the head, although other parts of the body are also covered. To ensure good vision, a window made of a transparent material is provided in the eye region of a head portion. The protective covering may be made of various types of material. Usually a plastic which is not easily inflammable is used, if necessary in conjunction with non-combustible additives. However, the disadvantage of this protective covering is that it is almost always impossible for the covering to remain in a harmful gas atmosphere.
'~
~4-235 ~30701 Another known protective covering serves the purpose of allowing the wearer to work for a longer ti~e in a harmful gas atmosphere. For this purpose the protective covering comprises at least one oxygen cylinder from which oxygen is supplied to the wearer. The oxygen supply in the oxygen cylinders is sufficient for a longer working time. The oxygen cylinders are equipped with a closing valve to which a pressure regulating valve is connected which reduces the pressure to a pressure suitable for the wearer, and maintains a constant circulation irrespective of the pressure in the oxygen cylinder. These protective coverings are equipped additionally with a mask to be worn by the wearer to ensure a reliable supply of oxygen in the region of the nose and mouth. The costly construction of this known protective covering makes it expensive and consequently it is only used where absolutely necessary.
Many protective coverings are only worn on infrequent occasions, for example, for accidents or fires, and usually they are only in use for a very short time. For the rest of the time the protective coverings are not in use, but are kept for such an emergency. It would be an extremely expensive solution if protective coverings of the second-mentioned type were used in this case, particularly for large-scale operations. On the other hand, it must be borne in mind that the first Xnown embodiment mentioned above ~Z3070~
ensures only a limited protection and, particularly in a harm-ful gas atmosphere, offers inadequate protection.
According to the present invention there is provided a protective apparatus comprising a hood portion havin~ a head portion adapted to enclose the head and a neck portion adapted to enclose the neck of a user and a body portion adapted to cover at least a part of the body of the user, said neck por-tion defini.ng an opening adapted to loosely encircle the neck to provide communication between the head portion and the body portion, and said body portion connection to the periphery of said opening, said head portion being provided with means for allowing vision of the user through the head portion, an oxy-gen-containing gas container, supply line means communicating between said gas container and the interior of the head por-tion, said oxygen-containing gas container and supply line means operative to supply oxygen to the interior of the head portion, supply initiating means operatively associated with said container for initiating the supply of oxygen to the head portion so as to increase the pressure in the head portion due to the throttling effect of the neck portion thereby forming a seal between said head portion and atmosphere so as to pro-hibit flow from the atmosphere to the head portion while per-mitting flow from the head portion to the atmosphere, and a metering means operatively associated with said container and said supply line means for metering the supply of oxygen, wherein the apparatus defines a sealed, breathable, oxygen-containing space sealed from the atmosphere by the higher than ambient pressure produced in the space by the oxygen flowing into said space and breath exhaled by the user out of said space whereby inhalation~from the atmosphere is precluded and exhaled breath partially escapes into the atmosphere. The supply initiating means may be manually actuable. Preferably ~Z3070~
the head portion and/or the body portion are made of a flex-ible ma-terial.
Thus, according to an embodiment of the invention, there is attached to the body portion at leas-t one closed oxy-gen cylinder from which a connecting line leads into the body portion and opens in the region of the face inside the head portion, a manually operated cylinder opener and a metering device being arranged in the connecting line between the oxy-gen cylinder and the opening of the connecting line.
In one embodim~nt of the present invention the body portion comprises a sleeveless covering provided with portions adapted to cover the chest, shoulders and back of a wearer.
Suitably at least one of said oxygen container, supply initi-ating means and metering means is attached to the chest cover-ing portion. Desirably at least one of said oxygen container, supply initiating means and metering méans is attached to the exterior of the chest covering portion. Suitably the appara-tus further includes connection means for at least partially housing said supply initiating means and providlng communica-tion between the oxygen-containing gas container and supply line means and metering means. Desirably the apparatus includes first and second gas containers operative to supply gas to the interior of the head portion via sa.ld gas line.
The present inventlosl will be further illustrated by way of the accompanying drawings, in which:-Figure 1 shows a front view of a protective appara-tus according to an embodiment of the invention;
Figure 2 shows a section through one embodiment of a connection member for the connection of a container and a metering device for a protective apparatus according to Figure l; and Figure 3 shows another embodiment of a connection ~23~
member with connections for two containers and a metering device, for a protective apparatus according to Figure 1.
The protective covering 1 shown in Figure 1 i5 made of a flexible, cloth-like material. The material may also be coated in order to achieve an assembly which is not easily combustible or is non-combustible. The protective covering 1 is composed of a head portion, or a helmet part 2 and a body ~ - ~a -~4-235 ~IL2307~1 part 3. The helmet part 2 has, in the wearer's eye region, a window 4, covered by a transparent material to allow vision, connected to which is a neck part 5 which merges into the body part 3. The body part 3 is composed of a chest portion 6, a shoulder portion 7 and a back portion which cannot be seen in Figure 1.
A gas cylinder, normally an oxygen cartridge 8, is fixed to the body part 3, for example, the chest portion 6 by means of a band 9. The oxygen cartridge 8 is a container full of oxygen at approximately 200 bars and has a closed connection piece 10 having a seal which can be opened by a pin in a way yet to be described. The oxygen cartridge is screwed into a connection member or line block 11 into which is also screwed a metering device comprising a metering throttle 12. A
connecting line or gas line 13 leading from the metering throttle 12 is fixed to the chest portion 6 by means of a band 14 and extends through the neck part 5 into the inside of the helmet part 2 and opens in the lower region of the window 4 approximately at the position of the wearer's nose and mouth.
The line block or connection member 11 is described with reference to Figure 2. It consists essentially of a block or member which has two screw-threaded connections lS, 16. The oxygen cartridge 8 is screwed into the screw-threaded connection 15 (see Figure 3). In Figure 1 the screw-threaded ~-235 ~2~d~
connection 15 is arranged on the head-side. The position of this connection does not affect t'ne function of the protective covering, i~e. the oxygen cartridge 8 may be either above or below the line block or connection member 11. The metering throttle 12 is screwed in the screw-threaded connection 16. This has a connecting piece 17 for the connection of the connecting line 13. Inside the metering throttle 12 are the components required for achieving a pressure reduction and a constant circulation; a piston 18 which is acted upon on one side by a spring 19 and on the other side by the oxygen pressure; and a fixed throttle poirt 20 which is connected in series with a variable throttle point 21. Various seals 22 are used to seal the interior of the line block 11 and the metering throttle 12.
A pointed pin 23 is displaceably mounted in the line block or connection member 11. Mounted on the side opposite the point there is an actuating lever 24 with an actuating cord 25 which acts with one end 26 of the lever on the pin 23. When the actuating cord 25 is pulled, the lever 24 is turned about its axis of rotation 27 and moves the pin 23 in the direction of the screw-threaded connection 15 against the force of a spring 28. The point of the pin 23 presses onto the oxygen cartridge screwed into the screw-threaded connection 15 and pierces the membrane-like seal ~o that, ~L23~370~
when the pin 23 springs back, the oxygen can flow via the metering throttle 12 through the line 13 into the helmet part
This invention relates to a protective apparatus, and, more particularly, to a protective apparatus comprising a head portion for covering the head and a body portion for covering at least part of the body~
Various designs of protective coverings are known. They are worn by a wearer as protection against external conditions in cases of emergency and accident, such as fires, dust generation and explosions. Protective coverings of this kind also serve as breathing apparatus since, in situations of this kind, the composition of the atmosphere usually changes, making normal respiration uncertain.
A known protective covering consists of a cloth-like material and may be wcrn over normal clothing. As it is the head which is most at risk in the above-mentioned situations, the protective covering primarily covers the head, although other parts of the body are also covered. To ensure good vision, a window made of a transparent material is provided in the eye region of a head portion. The protective covering may be made of various types of material. Usually a plastic which is not easily inflammable is used, if necessary in conjunction with non-combustible additives. However, the disadvantage of this protective covering is that it is almost always impossible for the covering to remain in a harmful gas atmosphere.
'~
~4-235 ~30701 Another known protective covering serves the purpose of allowing the wearer to work for a longer ti~e in a harmful gas atmosphere. For this purpose the protective covering comprises at least one oxygen cylinder from which oxygen is supplied to the wearer. The oxygen supply in the oxygen cylinders is sufficient for a longer working time. The oxygen cylinders are equipped with a closing valve to which a pressure regulating valve is connected which reduces the pressure to a pressure suitable for the wearer, and maintains a constant circulation irrespective of the pressure in the oxygen cylinder. These protective coverings are equipped additionally with a mask to be worn by the wearer to ensure a reliable supply of oxygen in the region of the nose and mouth. The costly construction of this known protective covering makes it expensive and consequently it is only used where absolutely necessary.
Many protective coverings are only worn on infrequent occasions, for example, for accidents or fires, and usually they are only in use for a very short time. For the rest of the time the protective coverings are not in use, but are kept for such an emergency. It would be an extremely expensive solution if protective coverings of the second-mentioned type were used in this case, particularly for large-scale operations. On the other hand, it must be borne in mind that the first Xnown embodiment mentioned above ~Z3070~
ensures only a limited protection and, particularly in a harm-ful gas atmosphere, offers inadequate protection.
According to the present invention there is provided a protective apparatus comprising a hood portion havin~ a head portion adapted to enclose the head and a neck portion adapted to enclose the neck of a user and a body portion adapted to cover at least a part of the body of the user, said neck por-tion defini.ng an opening adapted to loosely encircle the neck to provide communication between the head portion and the body portion, and said body portion connection to the periphery of said opening, said head portion being provided with means for allowing vision of the user through the head portion, an oxy-gen-containing gas container, supply line means communicating between said gas container and the interior of the head por-tion, said oxygen-containing gas container and supply line means operative to supply oxygen to the interior of the head portion, supply initiating means operatively associated with said container for initiating the supply of oxygen to the head portion so as to increase the pressure in the head portion due to the throttling effect of the neck portion thereby forming a seal between said head portion and atmosphere so as to pro-hibit flow from the atmosphere to the head portion while per-mitting flow from the head portion to the atmosphere, and a metering means operatively associated with said container and said supply line means for metering the supply of oxygen, wherein the apparatus defines a sealed, breathable, oxygen-containing space sealed from the atmosphere by the higher than ambient pressure produced in the space by the oxygen flowing into said space and breath exhaled by the user out of said space whereby inhalation~from the atmosphere is precluded and exhaled breath partially escapes into the atmosphere. The supply initiating means may be manually actuable. Preferably ~Z3070~
the head portion and/or the body portion are made of a flex-ible ma-terial.
Thus, according to an embodiment of the invention, there is attached to the body portion at leas-t one closed oxy-gen cylinder from which a connecting line leads into the body portion and opens in the region of the face inside the head portion, a manually operated cylinder opener and a metering device being arranged in the connecting line between the oxy-gen cylinder and the opening of the connecting line.
In one embodim~nt of the present invention the body portion comprises a sleeveless covering provided with portions adapted to cover the chest, shoulders and back of a wearer.
Suitably at least one of said oxygen container, supply initi-ating means and metering means is attached to the chest cover-ing portion. Desirably at least one of said oxygen container, supply initiating means and metering méans is attached to the exterior of the chest covering portion. Suitably the appara-tus further includes connection means for at least partially housing said supply initiating means and providlng communica-tion between the oxygen-containing gas container and supply line means and metering means. Desirably the apparatus includes first and second gas containers operative to supply gas to the interior of the head portion via sa.ld gas line.
The present inventlosl will be further illustrated by way of the accompanying drawings, in which:-Figure 1 shows a front view of a protective appara-tus according to an embodiment of the invention;
Figure 2 shows a section through one embodiment of a connection member for the connection of a container and a metering device for a protective apparatus according to Figure l; and Figure 3 shows another embodiment of a connection ~23~
member with connections for two containers and a metering device, for a protective apparatus according to Figure 1.
The protective covering 1 shown in Figure 1 i5 made of a flexible, cloth-like material. The material may also be coated in order to achieve an assembly which is not easily combustible or is non-combustible. The protective covering 1 is composed of a head portion, or a helmet part 2 and a body ~ - ~a -~4-235 ~IL2307~1 part 3. The helmet part 2 has, in the wearer's eye region, a window 4, covered by a transparent material to allow vision, connected to which is a neck part 5 which merges into the body part 3. The body part 3 is composed of a chest portion 6, a shoulder portion 7 and a back portion which cannot be seen in Figure 1.
A gas cylinder, normally an oxygen cartridge 8, is fixed to the body part 3, for example, the chest portion 6 by means of a band 9. The oxygen cartridge 8 is a container full of oxygen at approximately 200 bars and has a closed connection piece 10 having a seal which can be opened by a pin in a way yet to be described. The oxygen cartridge is screwed into a connection member or line block 11 into which is also screwed a metering device comprising a metering throttle 12. A
connecting line or gas line 13 leading from the metering throttle 12 is fixed to the chest portion 6 by means of a band 14 and extends through the neck part 5 into the inside of the helmet part 2 and opens in the lower region of the window 4 approximately at the position of the wearer's nose and mouth.
The line block or connection member 11 is described with reference to Figure 2. It consists essentially of a block or member which has two screw-threaded connections lS, 16. The oxygen cartridge 8 is screwed into the screw-threaded connection 15 (see Figure 3). In Figure 1 the screw-threaded ~-235 ~2~d~
connection 15 is arranged on the head-side. The position of this connection does not affect t'ne function of the protective covering, i~e. the oxygen cartridge 8 may be either above or below the line block or connection member 11. The metering throttle 12 is screwed in the screw-threaded connection 16. This has a connecting piece 17 for the connection of the connecting line 13. Inside the metering throttle 12 are the components required for achieving a pressure reduction and a constant circulation; a piston 18 which is acted upon on one side by a spring 19 and on the other side by the oxygen pressure; and a fixed throttle poirt 20 which is connected in series with a variable throttle point 21. Various seals 22 are used to seal the interior of the line block 11 and the metering throttle 12.
A pointed pin 23 is displaceably mounted in the line block or connection member 11. Mounted on the side opposite the point there is an actuating lever 24 with an actuating cord 25 which acts with one end 26 of the lever on the pin 23. When the actuating cord 25 is pulled, the lever 24 is turned about its axis of rotation 27 and moves the pin 23 in the direction of the screw-threaded connection 15 against the force of a spring 28. The point of the pin 23 presses onto the oxygen cartridge screwed into the screw-threaded connection 15 and pierces the membrane-like seal ~o that, ~L23~370~
when the pin 23 springs back, the oxygen can flow via the metering throttle 12 through the line 13 into the helmet part
2 of the protective covering 1.
Figure 3 shows a line block or connection member 11' in which two screw-threaded connections 29, 30 are provided into which two oxygen cartridges 8 are to be screwed. For convenience, one of the cartridges 8 is hereinafter called the upper cartridge and the other the lower cartridge. As in Figure 2, a pin 23 actuated by an actuating lever 24 is also provided in Figure 3, and is used for piercing the membrane-like seal of the adjacent lower oxygen cartridge 8.
Connecting line 31 provides communication between the two oxygen cartridges 8. After one oxygen cartridge 8 has been opened, the lower cartridge in Figure 3, a pressure builds up in connecting line 31 and acts on a piston 32 bearing a pin 33. The pressure forming in the line 31 causes the piston 32 with the pin 33 to move against the force of a spring 34 in the direction of the screw-threaded connection 30. This causes the membrane-like seal of the upper oxygen cartridge 8 screwed into the screw-threaded connection 30 to be pierced, whereupon the piston 32 is pushed back by the spring 33 and releases the oxygen flow which flows through a bore 35 in the piston 32 into the connection line 31. The combined oxygen flow from the two oxygen cartridges 8 flows via the metering throttle 12 via the line 13 into the helmet part 2 of the ~Z3070~
protective covering 1. Seals 22 are also arranged here in the same way as in Figure 2.
The essential point of the protective covering described above is that the use of one oxygen cartridge ensures a supply of oxygen to the helmet part 2 of the protective covering 1 for a specific time, for example 10 to 30 minutes. This limited supply of oxygen is adequate in most of the dangerous situations occurring for the wearer to leave the area of danger. It is not necessary for the protective covering 1 to be additionally sealed. The body part 3 can be designed so that it is impossible for the arms to be restricted. The entire oxygen unit requires little space and may thus be advantageously arranged on the chest part 6 where the actuating cord 25 is also easily accessible.
Actuation may also take place by a means other than the actuating cGrd 25, for example by a pre-controlled device which then requires only a slight force to actuate the pre-control. However, it is also possible for the actuation to be by the exertion of a pressure, for example by the hand or foot.
The protective covering described may also be equipped with cartridges which, instead of being filled with oxygen, are filled with another ga~ or a gas mixture.
The production costs of the described embodiment of the protective covering do not essentially exceed those of the _g_ ~Z30~70~L
first-mentioned known embodiment described above, but the covering nevertheless ensures protection even in a harmful gas atmosphere for a limited, but adequate length of time.
..
",.~1
Figure 3 shows a line block or connection member 11' in which two screw-threaded connections 29, 30 are provided into which two oxygen cartridges 8 are to be screwed. For convenience, one of the cartridges 8 is hereinafter called the upper cartridge and the other the lower cartridge. As in Figure 2, a pin 23 actuated by an actuating lever 24 is also provided in Figure 3, and is used for piercing the membrane-like seal of the adjacent lower oxygen cartridge 8.
Connecting line 31 provides communication between the two oxygen cartridges 8. After one oxygen cartridge 8 has been opened, the lower cartridge in Figure 3, a pressure builds up in connecting line 31 and acts on a piston 32 bearing a pin 33. The pressure forming in the line 31 causes the piston 32 with the pin 33 to move against the force of a spring 34 in the direction of the screw-threaded connection 30. This causes the membrane-like seal of the upper oxygen cartridge 8 screwed into the screw-threaded connection 30 to be pierced, whereupon the piston 32 is pushed back by the spring 33 and releases the oxygen flow which flows through a bore 35 in the piston 32 into the connection line 31. The combined oxygen flow from the two oxygen cartridges 8 flows via the metering throttle 12 via the line 13 into the helmet part 2 of the ~Z3070~
protective covering 1. Seals 22 are also arranged here in the same way as in Figure 2.
The essential point of the protective covering described above is that the use of one oxygen cartridge ensures a supply of oxygen to the helmet part 2 of the protective covering 1 for a specific time, for example 10 to 30 minutes. This limited supply of oxygen is adequate in most of the dangerous situations occurring for the wearer to leave the area of danger. It is not necessary for the protective covering 1 to be additionally sealed. The body part 3 can be designed so that it is impossible for the arms to be restricted. The entire oxygen unit requires little space and may thus be advantageously arranged on the chest part 6 where the actuating cord 25 is also easily accessible.
Actuation may also take place by a means other than the actuating cGrd 25, for example by a pre-controlled device which then requires only a slight force to actuate the pre-control. However, it is also possible for the actuation to be by the exertion of a pressure, for example by the hand or foot.
The protective covering described may also be equipped with cartridges which, instead of being filled with oxygen, are filled with another ga~ or a gas mixture.
The production costs of the described embodiment of the protective covering do not essentially exceed those of the _g_ ~Z30~70~L
first-mentioned known embodiment described above, but the covering nevertheless ensures protection even in a harmful gas atmosphere for a limited, but adequate length of time.
..
",.~1
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A protective apparatus comprising a hood portion having a head portion adapted to enclose the head and a neck portion adapted to enclose the neck of a user and a body por-tion adapted to cover at least a part of the body of the user, said neck portion defining an opening adapted to loosely encircle the neck to provide communication between the head portion and the body portion, and said body portion connected to the periphery of said opening, said head portion being pro-vided with means for allowing vision of the user through the head portion, an oxygen-containing gas container, supply line means communicating between said gas container and the inte-rior of the head portion, said oxygen-containing gas container and supply line means operative to supply oxygen to the inte-rior of the head portion, supply initiating means operatively associated with said container for initiating the supply of oxygen to the head portion so as to increase the pressure in the head portion due to the throttling effect of the neck por-tion thereby forming a seal between said head portion and atmosphere so as to prohibit flow from the atmosphere to the head portion while permitting flow from the head portion to the atmosphere, and a metering means operatively associated with said container and said supply line means for metering the supply of oxygen, wherein the apparatus defines a sealed, breathable, oxygen-containing space sealed from the atmosphere by the higher than ambient pressure produced in the space by the oxygen flowing into said space and breath exhaled by the user out of said space whereby inhalation from the atmosphere is precluded and exhaled breath partially escapes into the atmosphere.
2. A protective apparatus according to claim 1, wherein at least one of the body portion and the head portion is made of a flexible material.
3. A protective apparatus according to claim 1, wherein said supply initiating means is manually actuable.
4. A protective apparatus according to claim 1, wherein the body portion comprises a sleeveless covering pro-vided with portions adapted to cover the chest, shoulders and back of a wearer.
5. A protective apparatus according to claim 1, wherein at least one of said oxygen container, supply initiat-ing means and metering means is attached to the chest covering portion.
6. A protective apparatus according to claim 1, wherein at least one of said oxygen container, supply initiat-ing means and metering means is attached to the exterior of the chest covering portion.
7. A protective apparatus according to claim 1, further including connection means for at least partially housing said supply initiating means and providing communica-tion between the oxygen-containing gas container and supply line means and metering means.
8. A protective apparatus according to claim 1, including first and second gas containers operative to supply gas to the interior of the head portion via said gas line.
9. A protective apparatus according to claim 1, wherein the gas container is at least one oxygen cartridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000463396A CA1230701A (en) | 1984-09-17 | 1984-09-17 | Protective apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000463396A CA1230701A (en) | 1984-09-17 | 1984-09-17 | Protective apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230701A true CA1230701A (en) | 1987-12-29 |
Family
ID=4128733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000463396A Expired CA1230701A (en) | 1984-09-17 | 1984-09-17 | Protective apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1230701A (en) |
-
1984
- 1984-09-17 CA CA000463396A patent/CA1230701A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4440163A (en) | Emergency escape breathing apparatus | |
| US4905683A (en) | Respirator mask for positive pressure respirator equipment | |
| US4807614A (en) | Protective hood | |
| US3739774A (en) | Respirators | |
| US4352353A (en) | Protective clothing | |
| US4640277A (en) | Self-contained breathing apparatus | |
| EP1341582B1 (en) | Breathing apparatus | |
| GB2074455A (en) | Lung-controlled respiratory device | |
| EP0363530A1 (en) | Respirator | |
| DE69819601T2 (en) | Protective device against hypoxia that can be used in hostile surroundings | |
| KR102352619B1 (en) | Ventilation device for Mask of Self-contained breathing apparatus | |
| CA2226100A1 (en) | Breathing equipment | |
| GB2119660A (en) | A protective apparatus | |
| CA1230701A (en) | Protective apparatus | |
| KR100389802B1 (en) | The welding mask | |
| EP0631795B1 (en) | Regulator for self contained breathing apparatus | |
| DE69226784T2 (en) | RESPIRATORY DEVICE | |
| CA2026239A1 (en) | Positive pressure breathing assembly and demand regulator therefor | |
| GB2189707A (en) | Emergency escape breathing apparatus | |
| US5386824A (en) | Lightweight breathing device | |
| US4565196A (en) | Disposable smoke mask and apparatus | |
| US20030116156A1 (en) | Breathing apparatus | |
| CN206808757U (en) | A kind of emergency rescue firefighting helmet | |
| EP0810897B1 (en) | Face mask | |
| CA1223173A (en) | Emergency escape breathing apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |