CA1251117A - Gas mask - Google Patents
Gas maskInfo
- Publication number
- CA1251117A CA1251117A CA000488517A CA488517A CA1251117A CA 1251117 A CA1251117 A CA 1251117A CA 000488517 A CA000488517 A CA 000488517A CA 488517 A CA488517 A CA 488517A CA 1251117 A CA1251117 A CA 1251117A
- Authority
- CA
- Canada
- Prior art keywords
- filter
- layer
- carbon
- gas
- catalytic layer
- 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 A gas mask of the invention comprises breathing means positioned in a faced manner to a mouth of a user to have a function of filtering air to clean it.
The breathing means includes a plurality of filters and a catalytic layer of active carbon carrying at least one of platinum, palladium and platinum-palladium alloy.
The breathing means includes a plurality of filters and a catalytic layer of active carbon carrying at least one of platinum, palladium and platinum-palladium alloy.
Description
This invention relates to a gas mask adapted to breathe in clean air although a user is placed in a space where there is much poisonous gas such as carbon monoxide gas as in a fire.
Gas masks of the prior art have various forms in which they are worn on a head or in front of a face. One type of prior gas filtering means has a laminate of non-woven fiber or high density filters. Another prior gas filtering means fundamentally comprises porous material such as active carbon which is commercially used as deodorant.
Such gas filtering means has the function of absorbing carbon monoxide by utilizing chemically absorbing reac-tion of alumina hydrate.
Al-though such gas filtering means for the gas mask including absorbing ma-terial can be provided a-t low cost, the function of absorbing is disadvantageously lowered over a long -time. Accordingly, the prior gas mask cannot effectively fil-ter air including much carbon monoxide gas as in a fire, which prevents people from taking refuge in a safe placeD
Accordingly~ it is a principal object of the invention to provide a gas mask adapted to have a function of removing poisonous gas for a longer time.
It is another object of the invention to provide a gas mask adapted to convert carbon monoxide into innoxious carbon dioxide as well as absorb poisonous gas, lamp soot, tar, etc., which causes gas filtering to be made for a longer time even in a place such as a fire where there is much carbon monoxide.
In accordance with the present invention, there is provided a gas mask comprising breathing means positionable in front of a mouth of a user to filter air to clean i-t and including a plurality of filters and a catalytic layer of active carbon carrying at least one of platinum, palladium and a platinum-palladium alloy, the fil-ters comprising a back filter group including a metal mesh layer and a carbon filter disposed in back of the catalytic layer, a middle LCM:mls s~
~ 2~ 7 filter grip including a carbon filter and a high density fil-ter of non-woven fiber disposed in front of the catalytic layer and a front filter group including an ou-termost glass fiber filter and a high densi-ty fil-ter disposed in front of the middle filter group so as to be spaced from the middle filter group.
The above and other objects and features of the invention will be apparent from the description of an embodiment taken along with reference to the accompanying drawings in which:
Fig. 1 is a cross sectional view of a gas mask construc-ted in accordance with one embodiment o e the invention;
and Fig. 2 is an enlarged cross sectional view of breathing means used in the gas mask of Fig. 1.
Fig. 1 shows a gas mask 1 constructed in accordance with one embodiment of the invention. The gas mask 1 comprises a mask body or head protec-tor 2 formed of soft and fire-proof sheet of plastic material such as polyvinyl chloride, inorganic fiber such as glass fiber or a laminate of heat reflecting films such as aluminum foils.
The mask body 2 has a window portion 3 in front of the eyes of a user. The window portion 3 is formed of transparent or semi-LCM:mls 2 ra~
transparent sheet of fire-proof plastic ~aterial and secured to the mask body 2 in an air-tight manner.
The 8as mask l essentially comprises braething means 4 which is pro~ided in a faced manner to a mouth and a nose of the user. As illustrated in Fig. 2, the bTeathing means 4 cocprises a glass fiber !ayer 5a disposed outer~ost of the breathing means 4 to ~ilter out relati~ely larger particles included in poisonous gas such as lamp soot, tar, etc. and a high densitY
filter layer 5b of non-wo~eM fiber disposed inside of the glass fiber layer 5a to filter out fine particles passing through the glass fiber layer 5a. An aluminium frame 5 ha~ing air holes may be so proYided as to co~er edges of a laminate of the glass fiber layer 5a and the high densitY layer 5b. The aluminium frame 5 is secured to the mask body 2 in an air-tight ~anner. The glas_ fibeT f.lter 51 and the high density filter 5b form a front filter group.
The breathing means 4 essentially COmpTiSeS a catalytiG layer 7 of acti~e carbon carTying at least one of platinum. palladium and platinum-palladium alloy, which ser~es to con~eTt highly poisonous carbon mono~ide into inno~ious carbon diogide by o~idizing caTbon monogide at a normal te~perature. The catalytic layer 7 has water included to absorb oxidization reaction heat from carbon mono~ide.
In front of the catalytic layer 7 are pro~ided a high i.L2~ 7 densit~ filter layer 6a of non-~o~en fiber substantially similar to the high densitY fiiter la~er 5b and a catbon fiIter layer 6b . The high densitY
filter layer 6a serves to further filter out the air passing through the layers 5a and 5b while the carbon filter layer 6b serves to adjust ~entilation resistance as well as reinforce the adjacent layer 6a.
The high densitY filter layer 6a and the carbon filter layer 6b form a middle filter ~TOUp. In back of the catal~tic laYer 7 are a metal mesh layer 8 which serves to absorb and radiate o~idization reaction heat from carbon monoxide ar~ a carbon filter layer 9 similar to the carbon filter la~er 6b. The metal mesh layer 8 and the carbon filter layer 9 form a back filter group.
A cylindrical body 10 carries the high densitY
filter la~er 6a, the carboD fil~er layer ~b~ the catalytic layer 7, the metal mesh layer 8 amd the carbon filter layer 9 integrallY with them. The cylindrical body 10 at the edge thereof is secured to a supporting member 11, one end of which is secured to the mask body at the inner face thereof and the other end of which is integra]ly pro~ided with a mouth coYer 12. The mouth coYer 12 closely engages the mouth and the nose of the user to co~er them. Thus, it will be noted that the mouth and nose of the user can inhale only the air cleaned by the breathing means 4.
reinforcing me~ber 13 may be provided with the mouth cover i2t a leadin8 end of which is connected to the mask body 2.
An air pool 14 mag be proYided between the high densitY filter layers 5b and 6a. The air pool 14 serYes to uniforml~ disPerse the a~ount of air passing throu8h the high densitY fiber layer 6a to enhance the effect of filtering air and converting carbon monoxide into carbon dio~ide by the catalytic layer 7. In Fig.
. ~ . . . . . .. .. .. , . . . . ~ - . ...
1~ a reference numeral 15 designates a strap which is secured to the mask body 2 to bond the gas mask 1 to the user so that the breathing means 4 is faced to a face 16 of the user.
In operation, air including smoke and p~isonous gas passes through the glass fiber layer 5a to remoYe relati~ely larger particles such as lamp soot and tar, etc. and then passes through the high densitY filter laYerS 5D and 6a to remo~e fine particles which pass thTough the glass fiber filter 5a. The adiacent catalytic layer 7 serYes to conqert poisonous carbon mono~ide int~ inno~ious carbon dioxide by reacting with o~gen in air thTough at least one of platinum, palladium and platinuo-paliadium allo~ included in the catalytic la~er 7. Although heat is produced on reaction of o~idizing carbon mono~ide, it is absorbed by radiating it by means of the adjacent metal mesh layer 8 as well as by e~aporating ~ater in the ~L 2 ~L'9L~L7 catal~tic layer 7. Thus, it will be noted that air to be breathed in by the user has no abnormally high temperature. It will be understood that poisonous gas e~cept for carbon monoxide is removed by the porous absorbing function of active carbon carrying the catalytic metal in the catalgtic layer 7. It should be noted that the c~rbon filter iayers 6b and 9 in front of and in back of the catalytic layer 7 serve to provide proper air resistance to the air so as to maiiltain sufficient reaction -time. Thus, it will be noted that although there is a difference between the Qelocities of breathing in due to indiviRual variation, non-reactive gas passes through the catalytic layer 7.
1~ Accordingly, it will be noted that safe 'oTeathing is acco~plished for a longer time e~en in a place where there is carbon mono~ide of high concentration such as 2hd3 ~ 10000 ppm, for exa~ple, which cannot be accomplished b~ any prior ~as m~sk havins only absorption filtet.
The follo~ing table sho~s a result of test of poisonous gas treatment by the $as mask constructed in accordance with one embodiment of the inYention.
Table
Gas masks of the prior art have various forms in which they are worn on a head or in front of a face. One type of prior gas filtering means has a laminate of non-woven fiber or high density filters. Another prior gas filtering means fundamentally comprises porous material such as active carbon which is commercially used as deodorant.
Such gas filtering means has the function of absorbing carbon monoxide by utilizing chemically absorbing reac-tion of alumina hydrate.
Al-though such gas filtering means for the gas mask including absorbing ma-terial can be provided a-t low cost, the function of absorbing is disadvantageously lowered over a long -time. Accordingly, the prior gas mask cannot effectively fil-ter air including much carbon monoxide gas as in a fire, which prevents people from taking refuge in a safe placeD
Accordingly~ it is a principal object of the invention to provide a gas mask adapted to have a function of removing poisonous gas for a longer time.
It is another object of the invention to provide a gas mask adapted to convert carbon monoxide into innoxious carbon dioxide as well as absorb poisonous gas, lamp soot, tar, etc., which causes gas filtering to be made for a longer time even in a place such as a fire where there is much carbon monoxide.
In accordance with the present invention, there is provided a gas mask comprising breathing means positionable in front of a mouth of a user to filter air to clean i-t and including a plurality of filters and a catalytic layer of active carbon carrying at least one of platinum, palladium and a platinum-palladium alloy, the fil-ters comprising a back filter group including a metal mesh layer and a carbon filter disposed in back of the catalytic layer, a middle LCM:mls s~
~ 2~ 7 filter grip including a carbon filter and a high density fil-ter of non-woven fiber disposed in front of the catalytic layer and a front filter group including an ou-termost glass fiber filter and a high densi-ty fil-ter disposed in front of the middle filter group so as to be spaced from the middle filter group.
The above and other objects and features of the invention will be apparent from the description of an embodiment taken along with reference to the accompanying drawings in which:
Fig. 1 is a cross sectional view of a gas mask construc-ted in accordance with one embodiment o e the invention;
and Fig. 2 is an enlarged cross sectional view of breathing means used in the gas mask of Fig. 1.
Fig. 1 shows a gas mask 1 constructed in accordance with one embodiment of the invention. The gas mask 1 comprises a mask body or head protec-tor 2 formed of soft and fire-proof sheet of plastic material such as polyvinyl chloride, inorganic fiber such as glass fiber or a laminate of heat reflecting films such as aluminum foils.
The mask body 2 has a window portion 3 in front of the eyes of a user. The window portion 3 is formed of transparent or semi-LCM:mls 2 ra~
transparent sheet of fire-proof plastic ~aterial and secured to the mask body 2 in an air-tight manner.
The 8as mask l essentially comprises braething means 4 which is pro~ided in a faced manner to a mouth and a nose of the user. As illustrated in Fig. 2, the bTeathing means 4 cocprises a glass fiber !ayer 5a disposed outer~ost of the breathing means 4 to ~ilter out relati~ely larger particles included in poisonous gas such as lamp soot, tar, etc. and a high densitY
filter layer 5b of non-wo~eM fiber disposed inside of the glass fiber layer 5a to filter out fine particles passing through the glass fiber layer 5a. An aluminium frame 5 ha~ing air holes may be so proYided as to co~er edges of a laminate of the glass fiber layer 5a and the high densitY layer 5b. The aluminium frame 5 is secured to the mask body 2 in an air-tight ~anner. The glas_ fibeT f.lter 51 and the high density filter 5b form a front filter group.
The breathing means 4 essentially COmpTiSeS a catalytiG layer 7 of acti~e carbon carTying at least one of platinum. palladium and platinum-palladium alloy, which ser~es to con~eTt highly poisonous carbon mono~ide into inno~ious carbon diogide by o~idizing caTbon monogide at a normal te~perature. The catalytic layer 7 has water included to absorb oxidization reaction heat from carbon mono~ide.
In front of the catalytic layer 7 are pro~ided a high i.L2~ 7 densit~ filter layer 6a of non-~o~en fiber substantially similar to the high densitY fiiter la~er 5b and a catbon fiIter layer 6b . The high densitY
filter layer 6a serves to further filter out the air passing through the layers 5a and 5b while the carbon filter layer 6b serves to adjust ~entilation resistance as well as reinforce the adjacent layer 6a.
The high densitY filter layer 6a and the carbon filter layer 6b form a middle filter ~TOUp. In back of the catal~tic laYer 7 are a metal mesh layer 8 which serves to absorb and radiate o~idization reaction heat from carbon monoxide ar~ a carbon filter layer 9 similar to the carbon filter la~er 6b. The metal mesh layer 8 and the carbon filter layer 9 form a back filter group.
A cylindrical body 10 carries the high densitY
filter la~er 6a, the carboD fil~er layer ~b~ the catalytic layer 7, the metal mesh layer 8 amd the carbon filter layer 9 integrallY with them. The cylindrical body 10 at the edge thereof is secured to a supporting member 11, one end of which is secured to the mask body at the inner face thereof and the other end of which is integra]ly pro~ided with a mouth coYer 12. The mouth coYer 12 closely engages the mouth and the nose of the user to co~er them. Thus, it will be noted that the mouth and nose of the user can inhale only the air cleaned by the breathing means 4.
reinforcing me~ber 13 may be provided with the mouth cover i2t a leadin8 end of which is connected to the mask body 2.
An air pool 14 mag be proYided between the high densitY filter layers 5b and 6a. The air pool 14 serYes to uniforml~ disPerse the a~ount of air passing throu8h the high densitY fiber layer 6a to enhance the effect of filtering air and converting carbon monoxide into carbon dio~ide by the catalytic layer 7. In Fig.
. ~ . . . . . .. .. .. , . . . . ~ - . ...
1~ a reference numeral 15 designates a strap which is secured to the mask body 2 to bond the gas mask 1 to the user so that the breathing means 4 is faced to a face 16 of the user.
In operation, air including smoke and p~isonous gas passes through the glass fiber layer 5a to remoYe relati~ely larger particles such as lamp soot and tar, etc. and then passes through the high densitY filter laYerS 5D and 6a to remo~e fine particles which pass thTough the glass fiber filter 5a. The adiacent catalytic layer 7 serYes to conqert poisonous carbon mono~ide int~ inno~ious carbon dioxide by reacting with o~gen in air thTough at least one of platinum, palladium and platinuo-paliadium allo~ included in the catalytic la~er 7. Although heat is produced on reaction of o~idizing carbon mono~ide, it is absorbed by radiating it by means of the adjacent metal mesh layer 8 as well as by e~aporating ~ater in the ~L 2 ~L'9L~L7 catal~tic layer 7. Thus, it will be noted that air to be breathed in by the user has no abnormally high temperature. It will be understood that poisonous gas e~cept for carbon monoxide is removed by the porous absorbing function of active carbon carrying the catalytic metal in the catalgtic layer 7. It should be noted that the c~rbon filter iayers 6b and 9 in front of and in back of the catalytic layer 7 serve to provide proper air resistance to the air so as to maiiltain sufficient reaction -time. Thus, it will be noted that although there is a difference between the Qelocities of breathing in due to indiviRual variation, non-reactive gas passes through the catalytic layer 7.
1~ Accordingly, it will be noted that safe 'oTeathing is acco~plished for a longer time e~en in a place where there is carbon mono~ide of high concentration such as 2hd3 ~ 10000 ppm, for exa~ple, which cannot be accomplished b~ any prior ~as m~sk havins only absorption filtet.
The follo~ing table sho~s a result of test of poisonous gas treatment by the $as mask constructed in accordance with one embodiment of the inYention.
Table
2~ Kind of catalytic lager: Carbon CaTrying platinum Amount of catalyzer: 64g Gas to be treated: (a) Black smoke ~ C0(2500ppm) -- ~L 2 ~3L~L'gL7 tb) ~hite smoke ~ C0(2500ppm) ~reated gas: (a) C0(~4pp~
(b) CO(g4ppm) Thus, it uill be noted that the ~dS mask of the inYention had an e~cellent property.
While one preferred embodi~ent of the in~ention has been described and illustrated with teference to the accompanging drawings, it will be umdeTstood b~
those skilled in the art that it is by way of e~a~ple and that Yarious changes and modifications may be made without departing from the spirit and scope of the in~ention, which is intended to be defined only by the appenùed clai~s.
2~
(b) CO(g4ppm) Thus, it uill be noted that the ~dS mask of the inYention had an e~cellent property.
While one preferred embodi~ent of the in~ention has been described and illustrated with teference to the accompanging drawings, it will be umdeTstood b~
those skilled in the art that it is by way of e~a~ple and that Yarious changes and modifications may be made without departing from the spirit and scope of the in~ention, which is intended to be defined only by the appenùed clai~s.
2~
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A gas mask comprising breathing means positionable in front of a mouth of a user to filter air to clean it and including a plurality of filters and a catalytic layer of active carbon carrying at least one of platinum, palladium and a platinum-palladium alloy, said filters comprising a back filter group including a metal mesh layer and a carbon filter disposed in back of said catalytic layer, a middle filter grip including a carbon filter and a high density filter of non-woven fiber disposed in front of said catalytic layer and a front filter group including an outermost glass fiber filter and a high density filter disposed in front of said middle filter group so as to be spaced from said middle filter group.
2. A gas mask as set forth in Claim 1, wherein said catalytic layer includes water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000488517A CA1251117A (en) | 1985-08-12 | 1985-08-12 | Gas mask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000488517A CA1251117A (en) | 1985-08-12 | 1985-08-12 | Gas mask |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1251117A true CA1251117A (en) | 1989-03-14 |
Family
ID=4131166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000488517A Expired CA1251117A (en) | 1985-08-12 | 1985-08-12 | Gas mask |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1251117A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104394940A (en) * | 2012-06-21 | 2015-03-04 | Emw能源有限公司 | Portable air purifier |
| CN104436461A (en) * | 2014-12-11 | 2015-03-25 | 江苏同康特种活性炭纤维面料有限公司 | Filter firefighting self-rescue respirator |
| CN111544794A (en) * | 2018-06-28 | 2020-08-18 | 浙江带立新材料科技有限公司 | Canister structure with time-space conversion delay mechanism |
-
1985
- 1985-08-12 CA CA000488517A patent/CA1251117A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104394940A (en) * | 2012-06-21 | 2015-03-04 | Emw能源有限公司 | Portable air purifier |
| CN104436461A (en) * | 2014-12-11 | 2015-03-25 | 江苏同康特种活性炭纤维面料有限公司 | Filter firefighting self-rescue respirator |
| CN111544794A (en) * | 2018-06-28 | 2020-08-18 | 浙江带立新材料科技有限公司 | Canister structure with time-space conversion delay mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |