US3524464A - Pressure demand exhalation valve - Google Patents

Pressure demand exhalation valve Download PDF

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Publication number
US3524464A
US3524464A US3524464DA US3524464A US 3524464 A US3524464 A US 3524464A US 3524464D A US3524464D A US 3524464DA US 3524464 A US3524464 A US 3524464A
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Prior art keywords
valve
portion
tire
annular
element
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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 - Lifetime
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Galen M Glidden
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Automatic Sprinkler Corp
Scott Technologies Inc
Automatic Sprinkler Corp of America
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Automatic Sprinkler Corp
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    • 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
    • A62B18/10Valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/2496Self-proportioning or correlating systems
    • Y10T137/2544Supply and exhaust type

Description

United States Patent Inventor Galen M. Glidden South Haven, Michigan Appl. No. 715,270

Filed March 22, 1968 Patented Aug. 18, 1970 Assignee Automatic Sprinkler Corporation of America Cleveland, Ohio PRESSURE DEMAND EXHALATION VALVE 6 Claims, 2 Drawing Figs.

U.S. Cl 137/102 Int. Cl A62b 9/02, I F16k 15/14 Field of Search 137/102, 63r

[56] References Cited UNITED STATES PATENTS 2,954,793 10/1960 Seeler 137/102 3,232,304 2/1966 Koester 137/102 Primary Examiner- William F. ODea Assistant Examiner- William H. Wright AttorneyChristel and Bean ABSTRACT: A pneumatic tire element cooperates with a flapper valve disk by engaging the disk along an annular line of contact displaced inwardly of but close to the marginal edge of the disk which engages the valve seat. The marginal edge of the disk thus is positively located with respect to the valve seat but is free to flex out of contact with it.

Patented Aug. 18, 1970 FIG. I

INVENTORY GALEN M.'GL|DDEN %/%o ATTORNEYS PRESSURE DEMAND EXl-IALATION VALVE BACKGROUND OF THE INVENTION This invention relates generally to breathing fluid control art, and more particularly to a new and useful pressure demand exhalation valve assembly.

Protective face masks designed to provide an external source of breathing atmosphere for the wearer conventionally employ an inhalation valve providing access to the external source of breathing atmosphere and an exhalation valve permitting the users breath to be expelled externally. It is of interest particularly in conjunction with the exhalation valve to provide a positive closing action while at the same time eliminating the necessity for an undesirably greater differential in pressure to actuate the valve.

BRIEF SUMMARY OF THE INVENTION The present invention is directed to an improved form of exhalation valve assembly for use in conjunction with protective masks and the like as explained hereinabove wherein the exhalation valve consists of a flapper type element and a tire element which is subjected internally to the pressure of and is in communication with the external source of breathing atmosphere, the tire element having a marginal lip cooperative circumferentially with the flapper valve element for effecting uniform control thereover.

BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWING FIG. I is a sectional view taken through an inhalation-exhalation valve embodying the exhalation valve assembly according to the present invention;

FIG. 2 is a sectional view taken through the tire element of the exhalation valve assembly.

DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1, a respirator valve assembly is indicated generally therein by the reference character 10, it being appreciated that the valve assembly is adapted to be fitted to a face mask 12 or similar entity for disposition of the mouthpiece portion 14 in close proximity to the users mouth. The mouthpiece portion 14 is provided with a central opening I6 through which the user breathes in externally supplied oxygen or air, and also with an outlet opening 18 through which the expelled breath may pass as disclosed more particularly hereinafter. The mouthpiece may be a separate element, as shown, fitted to the main body 20 of the valve assembly. Body portion 20 is provided with an inlet tube 22 which may be externally threaded as at 24 for connection to the female portion of a flexible conduit, not shown, leading to a source of breatheable atmosphere. The inner end of inlet 22 carries a mounting web 26 which affixes the stem 28 of an inhalation flapper valve assembly 30 to the inlet tube. The flapper valve 30 is provided with a marginal edge portion 32 normally bearing against the annular face 34 of the inlet tube and adapted to perform a one-way valving action to permit the induction of the breatheable atmosphere. An exhalation flapper valve assembly indicated generally by the reference character 36 is provided and consists of a flapper valve element 38 and a tire element 40. Flapper valve element 38 is provided with an annular collar portion 42 embracing the inlet tube 22, as shown. Element 38 also includes a flat disk-like portion 44 projecting radially from the collar 42 and which merges with an arcuate annular lip portion 46 which terminates in a radial edge portion 48 laterally offset from the portion 44 and adapted to seat against the annular surface 50 of body 20, thereby normally closing an outlet passage 52' leading to the aforementioned exhalation passage 18.

Since protective devices such as these frequently find application in toxic environments it is practical and important to assure effective and complete closing of the exhalation valve, thereby to prevent back flow of the toxic atmosphere into the interior of the mask. At the same time, it is undesirable to so increase the pressure differential necessary to open the exhalation valve as to cause discomfort to the user. Accordingly, the particular shape of the flapper valve 38 described above acting in conjunction with the tire element 40 forms a cooperative combination of elements which serves to eliminate the possibility of back flow of the external atmosphere and minimizes the pressure differential necessary to operate the valve and expel the internal atmosphere therethrough.

To this end, tire element 40 is provided with a pair of mounting collar portions 54 and 56 which are joined by a specially configurated wall element forming the space 58 which, through openings 60in the collar 56, registering with openings 62 in the inlet tube 22 via an annular groove 61 therearound communicates with the source of external breatheable atmosphere. This normally provides a slightly positive pressure in the space 58 relative to the ambient external atmosphere. Collar 56 acts as a spacing collar between walls 64 and 68, and both collars can be mounted by split rings 63, as shown.

The wall joining the two collars 54 and 56 includes a generally radial portion 64 projecting from collar 54 and joining a generally circumferential portion 66 which extends beyond another generally radial wall portion 68 joined to collar 56 and then turns back under in an arcuate portion 70 to form the annular nose 72.

The dimension of tire element 40 is such as to place nose 72 in engagement with the arcuate lip portion 46 of flapper valve element 38 in slightly inwardly spaced relationship to the free marginal edge 74 of the radial edge portion 48. This assures complete peripheral contact of marginal edge portion 48 against annular face 50 to provide a positive sealing action preventing the inadvertent back flow of the ambient atmosphere into the interior of the protective device. I

At the same time, it allows the relatively flexible marginal edge 48 of the flapper valve 38 to deflect readily and at relatively low pressure differential existing across such flapper valve, thereby minimizing the effort on the part of the user. It will be appreciated of course that the tire element itself may deflect slightly and the combined flexure of tire element 40 and the resiliency of flapper valve element 38 combine in minimizing the effort involved in opening the exhalation valve while at the same time assuring the positive sealing action specified.

The action of tire 40 on flapper valve 38 is unidirectional, and movement of tire element 40 away from flapper valve 38 for any reason will not in itself open the latter. Valve 38 is designed to be self-closing, and if tire 40 should collapse somewhat under an inspiration-demand effort made by the user, the pressure differential across valve 38 would hold it closed. Further, the design of tire 40 and valve 38 is such that they would cooperate to hold valve 38 closed even upon some collapsing of tire 40. If that should occur, it is believed that nose 72 would move across lip 46 and thereby continue to exert a closing action on valve 38.

lclaim:

1. A respirator valve assembly comprising, in combination:

a tubular inlet member adapted for connection to an external source of breatheable atmosphere,

one-way valve means for controlling flow of breatheabl atmosphere through said inlet member,

an annular exhalation valve seat around said inlet member and providing a valve opening therewith for flow of expelled breath to ambient atmosphere,

and an exhalation valve assembly normally closing said valve opening, said valve assembly comprising an annular disk extending radially from siad inlet member to overlie said annular valve seat, a tire member embracing said inlet member and projecting radially therefrom, said tire having a marginal portion in generally axial alignment with said valve seat and hearing against said annular disk adjacent the periphery thereof, and means communicating the interior of said tire with the interior of said inlet member upstream of said one-way valve means 2. The assembly as defined in Claim 1, wherein said disk includes an annular main body portion, an annular radial edge portion laterally offset from said main body portion and normally bearing flatwise against said annular valve seat, and an arcuate annular lip portion joining said main body and radial edge portions, said marginal portion of the tire bearing against the flapper valve disk being in the form of a laterally offset annular nose, said nose engaging said lip portion of said disk adjacent said radial edge portion.

3. The assembly as set forth in Claim 1, wherein said tire includes a pair of generally radial wall portions each having a mounting collar engaging said inlet member, one of said collars spacing apart said wall portions, and means providing a communicating passage through said one collar and said inlet member.

4. The assembly as set forth in Claim 2, wherein said tire includes a first generally radial wall portion joined to a circumferential portion extending toward said valve seat and beyond another generally radial wall portion, said circumferential portion turning back to said other radial wall portion to form said nose.

5. The assembly as set forth in Claim 4, wherein one of said generally radial wall portions extends from a mounting collar engaging said inlet member and spacing apart said radial wall portions.

6. A respirator valve assembly comprising, in combination: a tubular inlet member adapted for connection to an external source of breatheable atmosphere, one-way valve means for controlling flow of breatheable atmosphere through said inlet member, an annular exhalation valve seat around said inlet member and providing a valve opening therewith for flow of expelled breath to ambient atmosphere, and an exhalation valve assembly normally closing said valve opening, said valve assembly comprising an annular disk extending radially from said inlet member to overlie said annular valve seat, a tire member embracing said inlet member and projecting radially therefrom, said tire having a marginal portion bearing against said annular disk adjacent the periphery thereof, and means communicating the interior of said tire with the interior of said inlet member upstream of said one-way valve means, said tire includes a pair of generally radial wall portions each having a mounting collar engaging said inlet member, one of said collars spacing apart said wall portions, and means providing a communicating passage through said one collar and said inlet member.

US3524464A 1968-03-22 1968-03-22 Pressure demand exhalation valve Expired - Lifetime US3524464A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387144A (en) * 1977-05-11 1983-06-07 Tullis Russell & Company Limited Battery separator material
FR2548910A1 (en) * 1981-03-10 1985-01-18 Usd Corp Respirator face mask
EP0449532A2 (en) * 1990-03-29 1991-10-02 F.X.K. Patents Limited Emergency breathing equipment
US5881725A (en) * 1997-08-19 1999-03-16 Victor Equipment Company Pneumatic oxygen conserver
US6364161B1 (en) 2000-09-27 2002-04-02 Victor Equipment Company Oxygen conserver
US20040018886A1 (en) * 2002-07-24 2004-01-29 Burrows Bruce D. Temporary golf club shaft-component connection
WO2014140600A1 (en) * 2013-03-15 2014-09-18 Scott Health & Safety Ltd Combined exhale and inlet valve for respirator

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387144A (en) * 1977-05-11 1983-06-07 Tullis Russell & Company Limited Battery separator material
FR2548910A1 (en) * 1981-03-10 1985-01-18 Usd Corp Respirator face mask
EP0449532A2 (en) * 1990-03-29 1991-10-02 F.X.K. Patents Limited Emergency breathing equipment
EP0449532A3 (en) * 1990-03-29 1992-12-02 F.X.K. Patents Limited Emergency breathing equipment
US5275153A (en) * 1990-03-29 1994-01-04 F.X.K. Patents Limited Demand valve having reaction load means and an insertable trigger element
US5881725A (en) * 1997-08-19 1999-03-16 Victor Equipment Company Pneumatic oxygen conserver
US6364161B1 (en) 2000-09-27 2002-04-02 Victor Equipment Company Oxygen conserver
US20040018886A1 (en) * 2002-07-24 2004-01-29 Burrows Bruce D. Temporary golf club shaft-component connection
US20040018887A1 (en) * 2002-07-24 2004-01-29 Burrows Bruce D. Temporary golf club shaft-component connection
WO2014140600A1 (en) * 2013-03-15 2014-09-18 Scott Health & Safety Ltd Combined exhale and inlet valve for respirator

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AS Assignment

Owner name: FIGGIE INTERNATIONAL INC.

Free format text: CHANGE OF NAME;ASSIGNOR:A-T-O INC.;REEL/FRAME:003866/0442

Effective date: 19810623

AS Assignment

Owner name: FIGGIE INTERNATIONAL INC.

Free format text: MERGER;ASSIGNOR:FIGGIE INTERNATIONAL INC., (MERGED INTO) FIGGIE INTERNATIONAL HOLDINGS INC. (CHANGED TO);REEL/FRAME:004767/0822

Effective date: 19870323