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Publication numberUS3202150 A
Publication typeGrant
Publication dateAug 24, 1965
Filing dateJun 11, 1962
Priority dateJun 11, 1962
Publication numberUS 3202150 A, US 3202150A, US-A-3202150, US3202150 A, US3202150A
InventorsArthur E Miller
Original AssigneeScott Aviation Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Filter attachment for a pressurized breathing apparatus
US 3202150 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Aug. 24, 1965 A. E. MILLER 3,202,150

FILTER ATTACHMENT FOR A PRESSURIZED BREATHING APPARATUS Filed June 11, 1962 2 Sheets-Sheet 1 INVENTOR GzwifiPi'E M27??? Alig. 24, 1965 MILLER 3,202,150

FILTER ATTACHMENT FOR A PRESSURIZED BREATHING APPARATUS Filed June 11, 1962 2 Sheets-Sheet 2 auri fizu E Ali/fer BY AT T ORNE Y 3 vs Y I NVENTOR. R

United States Patent,

I s 202 150 FILTER ATTACHMENT FOR A PRESSURIZED BREATHING APPARATUS Arthur E. Miller, Buifalo, N.Y., assiguor to Scott Aviation This invention relates to the combination of a filter and a breathing apparatus, said combination being so constituted that the person who is wearing the combination may either breathe in ambient air which was originally slightly contaminated but which has been completely purified by .a filter or, optionally, may cut 01f this flow of ambient air through the filter and breathe in only breathing fluid that is supplied by a breathing apparatus from a tank of compressed breathing fluid.

The principal object of the invention is to enable a person, who is approaching an area which might be contaminated, to breathe in either pure air or lightly contaminated, ambient air through a purifying filter so long as the contaminants in the ambient air are not greater than the filter can adequately handle, and then, if or when the percentage of contaminants becomes excessive, to switch over from the filter to a breathing apparatus that is supplied by pure breathing air from a pressurized tank.

Other objects of the invention and practical solutions thereof are described in detail in the following specifications and in the accompanying drawings, wherein:

FIGURE 1 is a front elevation of the upper torso of a fireman equipped with my complete invention with all of its component part connected together.

FIGURE 2 is a similar front elevation, but showing the filter 8 disconnected from the pressurized breathing apparatus.

FIGURE 3 is a side elevation of the fireman equipped with my complete invention with all of its component parts connected together, as in FIGURE 1.

FIGURE 4 is a fragmentary, horizontal section through the filter 8, taken on line 4-4, FIGURE 3.

For convenience, I will describe my invention precisely as it is illustrated, but it is to be definitely understood that the breadth of my invention is to be measured solely by its intrinsic novelty and by the scope of the appended claims.

I will further assume that the user of my invention is a fireman and that he has been ordered to move into an \area which might be contaminated by nuclear fall-out,

and that he has prepared himself to go a maximum distance and directly to the heart of the catastrophe, after leaving an outlying region where he is sure that the ambient air is pure.

Now as he i about to enter the area where the ambient air might be contaminated, he dons a harness 5 which carries a pressurized air tank 6 on his back, and a demand regulator 7 and a filter 8 on his chest, said regulator and filter being hung on the chest strap 10 of the harness 5. He then connects the high-pressure, air-hose 11 of the air tank shut-off valve 12 with aforesaid demand regulator 7.

The filter 8 is provided with a short, corrugated hose 13 whose distal end is tubularly connected to the lateral arm 14 of a metal T pipe fitting 15. The coupling nut 16 of the T pipe fitting 15 is then screwed onto the demand regulator 7, while the coupling nut 17 of the mask hose 18 is screwed onto the upper end of said T pipe fitting 15, the upper end of said mask hose 18 being tubularly connected with a mask 20. An exhalation valve 21 is connected to the mask. (This mask 20 3 ,292,150 Patented Aug. 24, 1965 2 a can, of course, be replaced by an oro-na-sal mask orby a plain mouth piece, if desired.) i i As shown in FIGURE 4, the filter 8 isrconstructed of a cylindrical, metal, replaceable canister 22 whichis screwed into a metal, L, pipe fitting 23 in the lower bore of which is staked, or otherwise secured, a check valve 24. This check valve 24 allows ambient air to be sucked in through the corrugated, paper, filter element 25 and then to pass through said check valve 24 and thence into the short, corrugated, filter hose 13 tothe T pipe fitting 15. Any reverse fiow is, of course, prevented by said check valve 24. I Operation In FIGURES 1 and 3 we will at first assume that the shut-01f valve 12 of. the pressurized air tank 6 isclosed.

We will also assume in these FIGURES l and 3 that the fireman has left the area where the purity of the ambient air is unquestionable and that he is about to enter an area which may be at least lightly contaminated Withfor instance, atomic tall-out. He is, therefore, at this time about to breathe ambient air in through the filter 8 whose filter element is capable of removing small percentages of contaminants.

It is to be borne in mind that, at this time, he is not depleting the supply of compressed air in his tank 6, and hence is lengthening his radius of operations by put-ting off any breathing from said air tank just' as long as it is safe to do so.

Assuming that he is now moving straight to the center of the disaster, it is to be expected that, at some point or other, he will learn from his Geiger or other contaminant counter, that the contaminant percentage is too high for the filter 8 to adequately handle the difiiculty. At this point the fireman opens the shut-off valve 12 of his air tank 6 and also adjusts hi demand pressure regulator to provide a positive pressure. This prevents any inhalation pressure from opening the check valve 24 of the filter :8, and hence all the air he then breathes is supplied from the compressed air tank 6.

Dual use of breiathz'ng apparatus FIGURE 2 illustrates how the pressurized breathing apparatuscan be used as a commercial unit independently of the filter 8. In other Words, this FIGURE 3 illustrates :how a large quantity of standard pressurized breathing equipment can be carried on hand by the fire department, and, in addition, a limited number of filter assemblies kept available, any one of which can be joined to any one of the pressurized breathing apparatii, or idly hung of the chest strap 10 of the harness 5 (as in FIG- URE 2) for use in doubtful situations where itmight possibly be advantageous to have a contaminant filter available.

I claim:

1. Portable breathing apparatus comprising, incombination, a fiace mask, an exhalation valve connected to said mask, a filter tubularly connected .to said mask for supplying filtered ambient air to said mask, a container of compressed breathing fluid, a demand regulator of the positive pressure type tubularly connected to said container and to said mask for supplying breathing fluid to .said mask from said container on demand, and a check valve in the tubular connection between said filter and said mask preventing the escape of breathing fluid from said container through said filter, said filter, said container and said regulator being adapted to be carried by the user, wherein the tubular connections between said filter and said mask and between said regulator and said mask include a T fitting, means detachably connecting said fitting to said regulator, a first hose interconnecting said filter and said fitting, a second hose inter- '3 8 connecting said mask and saidjfitting, and means detachably connecting said second hose to said fitting both said means being interchangeable whereby said second hose can be detached from said fitting and attached to said regulator upon detachment of said fitting from said regulator. 72. T-he combination set forth in claim 1, together with a shut-01f valve interposed in the tubular connection between said regulator and said container. 7

3. Portable breathing apparatus comprising, in com- .bination, a face mask, an exhalation valve connected to said mask, a filter tubularly connected to said mask for supplying filtered ambient air to said mask, a container of-compressed breathing fluid, a demand regulator of the positive pressure type tubularly connected to said container and to said mask for supplying breathing fluid to said mask from said container on demand, and a check valve in the tubular connection between said filter and said mask preventing the escape of breathing fluid from said container through said filter, said filter, said container and said regulator being adapted'to be carried by the user, wherein the tubular connections between said filter and said mask and between said regulator and said mask include :a first hose connected to said filter, a second hose connected to said mask, means including a fitting carried by' said regulator for detachably connecting said'first hose to said second hose, thereby supplying filtered ambient air to said mask, and means detachably connected said second hose to said regulator for supplying breathing fluid to said mask from said container. r 7

References Cited by the Examiner UNITED STATES PATENTS 2,764,151 9/56 cu 128-142 2,818,066 12/57 Gliclden 1 2s 142 "2,948,292 8/60 Fitt 12s 142 RICHARD A. GAUDET, Primary Examiner.

JORDAN FRANKLIN, Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2764151 *Jun 16, 1953Sep 25, 1956Scott Aviation CorpUnderwater breathing apparatus
US2818066 *Sep 16, 1954Dec 31, 1957Acme Prot Equipment CompanyTransfer mask
US2948292 *Jun 7, 1957Aug 9, 1960Normalair LtdBreathing apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3773044 *Mar 10, 1971Nov 20, 1973Wallace RChemical breathing apparatus with alarm device
US3803817 *Nov 2, 1971Apr 16, 1974Ato IncFilter assembly
US4019507 *Sep 24, 1975Apr 26, 1977Dragerwerk AktiengesellschaftProtective breathing device having a filtering apparatus and additional oxygen supply for emergency use
US4108172 *Jun 14, 1977Aug 22, 1978Moore Jr George BCarbon dioxide absorption canister for use with analgesia equipment
US4265238 *Aug 16, 1979May 5, 1981The United States Of America As Represented By The Secretary Of The NavySimulated oxygen breathing apparatus
US4419110 *Aug 20, 1981Dec 6, 1983Figgie International Inc.Gas filter container
US4548626 *Apr 30, 1984Oct 22, 1985Figgie International Inc.Particulate air filter assembly
US4793342 *Mar 3, 1987Dec 27, 1988Terry McGovern GaberEmergency smoke hood and breathing mask
US4841953 *Nov 7, 1986Jun 27, 1989Dodrill Gregg WAuxiliary supply system for a portable self-contained breathing apparatus
US4955373 *Oct 16, 1989Sep 11, 1990Maguire Iii John NAir breathing assembly and air filter attachment therein
US5318019 *Mar 19, 1992Jun 7, 1994Celaya Marty AEmergency portable oxygen supply unit
US5562092 *Jul 31, 1995Oct 8, 1996George; Eric W.Firefighter's emergency smoke filter
US5592935 *May 3, 1995Jan 14, 1997Minnesota Mining And Manufacturing CompanyPositive/negative air pressure adaptor for use with respirators
US5720280 *Oct 8, 1996Feb 24, 1998Minnesota Mining And Manufacturing CompanyAttenuator for use with respirators
US6398266Sep 22, 1999Jun 4, 2002Ballard Medical ProductsCollapse resistant popoid connector
US7380551Sep 3, 2004Jun 3, 2008Tvi CorporationBreathing apparatus
US7513251 *Jun 13, 2005Apr 7, 2009Mel BlumHand-held potassium super oxide oxygen generating apparatus
US7543584Sep 29, 2003Jun 9, 2009Interspiro, Inc.Powered air purifying respirator system and breathing apparatus
US7647927Aug 23, 2004Jan 19, 2010Wilcox Industries Corp.Self-contained breathing system
US7937775Aug 8, 2006May 10, 2011Microtek Medical, Inc.Surgical protective head gear assembly including high volume air delivery system
US8113198Jan 15, 2010Feb 14, 2012Wilcox Industries Corp.Self-contained breathing system
US8919340Mar 22, 2012Dec 30, 2014Mel BlumHand-held potassium super oxide oxygen generating apparatus
US8950401Feb 13, 2012Feb 10, 2015Wilcox Industries Corp.Self-contained breathing system
US20040182394 *Mar 21, 2003Sep 23, 2004Alvey Jeffrey ArthurPowered air purifying respirator system and self contained breathing apparatus
US20050022817 *Sep 3, 2004Feb 3, 2005Tvi CorporationBreathing apparatus
US20050109341 *Apr 2, 2004May 26, 2005Alvey Jeffrey A.Powered air purifying respirator system and self contained breathing apparatus
US20060048777 *Jul 21, 2005Mar 9, 2006Interspiro, Inc.Apparatus and method for providing breathable air and bodily protection in a contaminated environment
US20060191533 *Sep 8, 2005Aug 31, 2006Interspiro, Inc.Powered air purifying respirator system and breathing apparatus
US20070235030 *Aug 23, 2004Oct 11, 2007Teetzel James WSelf-contained breathing system
US20080053447 *Aug 29, 2007Mar 6, 2008Ratajczak John AAdapter for air purifying filter
US20100224193 *Jan 15, 2010Sep 9, 2010Wilcox Industries Corp.Self-contained breathing system
US20120066819 *Feb 5, 2010Mar 22, 2012Materiels Industriels De SecuriteAssembly for protecting an individual, comprising an insulation suit
USD466607Aug 27, 2001Dec 3, 2002Kimberly-Clark Worldwide, Inc.Flexible connector
USD473941Aug 27, 2001Apr 29, 2003Kimberly-Clark Worldwide, Inc.Flexible connecting device
USD476731Aug 27, 2001Jul 1, 2003Kimberly-Clark Worldwide, Inc.Bendable connector
USD486909Aug 27, 2001Feb 17, 2004Kimberly-Clark Worldwide, Inc.Bendable connecting device
DE3143103A1 *Oct 30, 1981May 11, 1983Draegerwerk AgAtemschutzgeraet als filtergeraet mit zusaetzlicher sauerstoffversorgung, insbesondere als fluchtgeraet
DE3230636A1 *Aug 18, 1982Mar 10, 1983Figgie Int IncBehaelter fuer glasfilter
DE3512644A1 *Apr 6, 1985Oct 16, 1986Bartels & RiegerProtective breathing equipment
EP0241188A1 *Mar 27, 1987Oct 14, 1987Racal Safety LimitedImprovements in and relating to breathing apparatus
EP0781156A1 *Aug 31, 1995Jul 2, 1997Lifepro, Inc.Method of air filtration for fire fighter emergency smoke inhalation protection
EP0781156B1 *Aug 31, 1995Dec 10, 2003Lifepro, Inc.Method of air filtration for fire fighter emergency smoke inhalation protection
EP0803434A2 *Apr 16, 1997Oct 29, 1997HTM SPORT S.p.A.Regulator for underwater breathing apparatus
EP0803434A3 *Apr 16, 1997Dec 29, 1997HTM SPORT S.p.A.Regulator for underwater breathing apparatus
EP0847296A1 *Aug 30, 1996Jun 17, 1998Besha, Richard G.Personal emergency breathing system for supplied air respirators
EP0847296A4 *Aug 30, 1996Jul 18, 2001Besha Richard GPersonal emergency breathing system for supplied air respirators
WO1992010237A1 *Nov 27, 1991Jun 25, 1992Aran Fire & Safety (Uk) LimitedImprovements in or relating to safety helmets
Classifications
U.S. Classification128/205.12, 128/205.25, 55/DIG.350, 128/204.18, D24/110.2, 128/202.27
International ClassificationA62B7/02, A62B18/00
Cooperative ClassificationA62B7/02, A62B18/00, Y10S55/35
European ClassificationA62B18/00, A62B7/02
Legal Events
DateCodeEventDescription
Jun 30, 1981ASAssignment
Owner name: FIGGIE INTERNATIONAL INC.
Free format text: CHANGE OF NAME;ASSIGNOR:A-T-O INC.;REEL/FRAME:003866/0442
Effective date: 19810623