GB572888A - Improvements in or relating to respirators - Google Patents

Improvements in or relating to respirators

Info

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
Application number
GB359842A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUY R FOUNTAIN Ltd
Original Assignee
GUY R FOUNTAIN Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GUY R FOUNTAIN Ltd filed Critical GUY R FOUNTAIN Ltd
Priority to GB359842A priority Critical patent/GB572888A/en
Publication of GB572888A publication Critical patent/GB572888A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing 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
    • A62B18/08Component 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.
GB359842A 1942-03-18 1942-03-18 Improvements in or relating to respirators Expired GB572888A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (9)

* Cited by examiner, † Cited by third party
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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