GB912418A - Improvements in or relating to masks - Google Patents
Improvements in or relating to masksInfo
- Publication number
- GB912418A GB912418A GB3055260A GB3055260A GB912418A GB 912418 A GB912418 A GB 912418A GB 3055260 A GB3055260 A GB 3055260A GB 3055260 A GB3055260 A GB 3055260A GB 912418 A GB912418 A GB 912418A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- exhalation valve
- tube
- exhalation
- sept
- 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
Classifications
-
- 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
- A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
Landscapes
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
912,418. Respiratory appliances. VICKERS RESEARCH Ltd. Sept. 25, 1961 [Sept. 5, 1960], No. 30552/60. Class 81 (2). In a breathing-mask, such as for use for high altitudes, the exhalation valve is controlled by a pressure-sensitive member connected to the inlet, the member having means for delaying its response to pressure changes. Respirable gas is supplied to a mask 6 through a tube 4 and open ducts 5 and vitiated air passes out through an exhalation valve 12 to an outlet 9. However, a capsule 13, having its interior connected through a narrow-bore tube 17 to the supply pipe 4, carries a pressure member 14 which may bear upon the exhalation valve plate 11 to tend to hold it closed. Thus as the supply pressure is increased with increasing altitude an equivalent pressure is applied to the valve 12 to prevent a through flow and consequent wastage of gas. However the exhalation valve may be readily opened by the rapid, slight rise in pressure caused by exhalation of the user since this is not transmitted through the restricted tube 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3055260A GB912418A (en) | 1960-09-05 | 1960-09-05 | Improvements in or relating to masks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3055260A GB912418A (en) | 1960-09-05 | 1960-09-05 | Improvements in or relating to masks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB912418A true GB912418A (en) | 1962-12-05 |
Family
ID=10309424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3055260A Expired GB912418A (en) | 1960-09-05 | 1960-09-05 | Improvements in or relating to masks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB912418A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2169209A (en) * | 1984-11-23 | 1986-07-09 | Gas Serv Offshore Ltd | Secondary life support system |
| CN110122949A (en) * | 2019-04-10 | 2019-08-16 | 江山凡络达医疗器械有限公司 | A kind of replaceable anti-dust mask |
-
1960
- 1960-09-05 GB GB3055260A patent/GB912418A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2169209A (en) * | 1984-11-23 | 1986-07-09 | Gas Serv Offshore Ltd | Secondary life support system |
| CN110122949A (en) * | 2019-04-10 | 2019-08-16 | 江山凡络达医疗器械有限公司 | A kind of replaceable anti-dust mask |
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