GB572888A - Improvements in or relating to respirators - Google Patents
Improvements in or relating to respiratorsInfo
- Publication number
- GB572888A GB572888A GB359842A GB359842A GB572888A GB 572888 A GB572888 A GB 572888A GB 359842 A GB359842 A GB 359842A GB 359842 A GB359842 A GB 359842A GB 572888 A GB572888 A GB 572888A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- annulus
- seating
- diaphragm
- mouth
- 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
Abstract
572,888. Check valves. FOUNTAIN, Ltd., G. R., and HOULGATE, H. J. March 18, 1942, Nos. 3598, 6087, 9339 and 16239. [Class 135] [Also in Group VI] An exhaling valve for a respirator comprises an annulus 15 of rubber or like resilient material clamped at its inner edge between two annular surfaces, one of which is slightly larger than the other so that the annulus assumes a concave form on the side of the smaller clamping surface to ensure the annulus bearing against an annular seat 18. The valve seating may be constituted by an edge or a very narrow surface so as to obtain line contact between the seating and the annulus, and the larger annular clamping surface may be conical so that the valve is biassed against its seating. An acoustic diaphragm 2 for transmitting sound to the exterior may be formed separately from the valve and the diaphragm and valve may be arranged coaxially in a single aperture in the face-piece of the respirator so as to lie directly in front of the user's mouth. The diaphragm and the passage or passages leading to a point in front of the user's mouth are arranged to provide efficient transmission of high speech frequencies. Specification 539,933, [Group XXXIX], is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB359842A GB572888A (en) | 1942-03-18 | 1942-03-18 | Improvements in or relating to respirators |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB359842A GB572888A (en) | 1942-03-18 | 1942-03-18 | Improvements in or relating to respirators |
Publications (1)
Publication Number | Publication Date |
---|---|
GB572888A true GB572888A (en) | 1945-10-29 |
Family
ID=9761345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB359842A Expired GB572888A (en) | 1942-03-18 | 1942-03-18 | Improvements in or relating to respirators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB572888A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2738788A (en) * | 1952-04-08 | 1956-03-20 | Willson Products Inc | Respirator with speaking diaphragm |
US2974665A (en) * | 1954-02-12 | 1961-03-14 | Armard V Motsinger | Gas mask speech transmission |
US3035574A (en) * | 1959-01-21 | 1962-05-22 | Mine Safety Appliances Co | Combination exhalation valve and speaking diaphragm |
US3109425A (en) * | 1960-03-04 | 1963-11-05 | Electric Storage Battery Co | Respirator speaking diaphragm and exhalation valve unit |
DE1167656B (en) * | 1959-01-21 | 1964-04-09 | Mine Safety Appliances Co | Respirator with a speech membrane |
US3140754A (en) * | 1954-02-12 | 1964-07-14 | Armard V Motsinger | Gas mask speech transmission |
US4373520A (en) * | 1979-09-28 | 1983-02-15 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence | Respirator speech unit/outlet valve |
EP0319612A1 (en) * | 1987-12-11 | 1989-06-14 | Zentralen Institut Po Chimitscheska Promischlenost | Device affording breathing and speaking, particularly for breath-protection masks |
-
1942
- 1942-03-18 GB GB359842A patent/GB572888A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2738788A (en) * | 1952-04-08 | 1956-03-20 | Willson Products Inc | Respirator with speaking diaphragm |
US2974665A (en) * | 1954-02-12 | 1961-03-14 | Armard V Motsinger | Gas mask speech transmission |
US3140754A (en) * | 1954-02-12 | 1964-07-14 | Armard V Motsinger | Gas mask speech transmission |
US3035574A (en) * | 1959-01-21 | 1962-05-22 | Mine Safety Appliances Co | Combination exhalation valve and speaking diaphragm |
DE1167656B (en) * | 1959-01-21 | 1964-04-09 | Mine Safety Appliances Co | Respirator with a speech membrane |
US3109425A (en) * | 1960-03-04 | 1963-11-05 | Electric Storage Battery Co | Respirator speaking diaphragm and exhalation valve unit |
US4373520A (en) * | 1979-09-28 | 1983-02-15 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence | Respirator speech unit/outlet valve |
EP0319612A1 (en) * | 1987-12-11 | 1989-06-14 | Zentralen Institut Po Chimitscheska Promischlenost | Device affording breathing and speaking, particularly for breath-protection masks |
US4869244A (en) * | 1987-12-11 | 1989-09-26 | Nentchev Valentin N | Valve-talking device |
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