US 1814506 A
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July 14, 1931. R. H. DAVIS BREATHING APPARATUS Filed Aug. 20, 1929 2: sheets-sneet 1 F' T l I l I l I l l i l l I l I I i l lnvanto'r GM M bw July 14, 1931, R. H. DAVIS BREATHING APPARATUS Filed Aug. 20, 1929 2 Sheets-Sheet 2 Patented July 14, 1931 auren STATES PATENT OFFICE- ROBERT HENRY DAVIS, or LoNnom'ENeLAND BREATHING APPARATUS Application filed August 20, 929, Serial museum, and in Great Britain May 21, 1929.-
This invention relates to breathing apparatus of the kind employing a breathing bag in which a chemical substance is employed to absorbthe carbon dioxide content of the expired breath. of the user of the apparatus, and also having within the bag one or more comparatively small and light capsules filled with a respiratory gas, such asoxygen, or
dispense with the use of chemical substances capable of evolving oxygen in the manner described, as it is found that the liberation of the oxygen therefrom is comparatively slow. 7 1
According to the present invention there is provided a breathing apparatus comprising a breathing bag, a canister open to the said bag, and charged with a"che'mical substance which reacts only 'toabso'rb carbon dioxide, a mouth-piece for the user of the apparatus connected to the said canister so; that his breath will pass through the latter into the bag, and at least one capsule charged with respiratory gas, such as oxygen, or air, 'or a mixture of air andoxygen, under pressure,
disposed'within the bag and capable of being unsealed to liberate the gas into the bag.
In a suitable arrangement for carrying the invention into practice, a chemical absorbent 40 for carbon dioxide, for instance, soda lime or caustic soda, or a mixture of both ofsaid substances,is disposed within a canister arranged in communication with amouth-piece and a breathing bag containing the capsule or cap- 4 sules, A cylinder containing compressed oxygen is arranged outside the said bag and the outlet of the said cylinder connected to the said bag by a tube so that by operating a sealing valveof the said cylinder a supply 5.0 of oxygen can be furnished to thebag,
which addition to or in place of that furnished by the capsule or capsules.
The canister may be placed either outside or within the breathing bag and connected'by atube to the mouthpiece. s The breathing bag may also advantageously be fitted with a connection whereby it can be charged with respiratory gas such as oxygen from any suitable source of supply independently of the capsule or capsules contained'within the said bag and of the oxygen cylinder 3 above referred to.
Thebr'eathing bag may also be fitted with paratus is used in a'p'oisonous atmosphere 1 and of being opened when the apparatus is used under waterto allow of the escape of excess gas. v
To enable the invention to be clearly understood, the same will be described with reference to the accompanying drawings, in
a valve capableof being closed when the ap- -Figure 1 isasectional front elevation of breathing apparatus constructed in accordance with the invention. Figure 2 is a sectional side elevation of the pparatus, the section being taken on the line 2-2 of Figure 1, and, p
Figures 3 and 4 are, respectively, a sectional elevation and a plan view of thecani'ster'for -the chemical absorbent, detached'from the apparatus, I i
Referrmgto the drawings, a 1s a breathing bag made of flexible gas-tight materiahb is V I a capsule arranged within the bag a,the said if capsule being filled with a respiratory gas such 'asoxygen, orair, or a mixture of oxygen and air, under pressure, and having its outlet 0 sealed with a closed tube d deslgned to be broken off to allow of the'escape of the compressed gas into the bag 5a. To enable the breaking of the tube d to be easily effected,
"it' is furnishedwitha screw-thread," and a fit ting e is arranged to project through and within the bag a and be secured to a side wall a ofthe latter by a nut 'f, the said fitting 'beingformed with a screw-threaded hole 9 to receive the tube d. If, the'refore'the portion of the fitting'e' exterior to the bag be held by One 11ml f the a a the app atus, p es;
sure applied on the exterior of the bag by the other hand can be exerted on the capsule and cause rupture of the tube d, to allow the compressed gas in the said capsule to expand into the said bag.
h is a canister containing a chemical capable of reacting only with carbondioxide, for instance, soda lime, or caustioisoda, or a mixture of both said substances, which is coilfined between layers 2', i of wire gauze or the like, the layer 2' being. located adjacent an opening 3' in the upper end of the canister and the layer 71 fitting within the open lower end it of ee ethe e d. p hihs 1 be ng 1- rounded byan upwardly projecting 'rimjy' The sa d ehie e e. a ran e thin he bag a and is securedtoa portion a? of the ennenweltei he. ee el eget e ep hin y at ilPSJJFBQ Z end be ng eehh ted y a lexi tube to -pe eemenwh eh e m unted e eee el m T hehh t eh f e a etee e the tu l ehywey 0 hollow fitting airing-e; hhe re teheieh. 0 i the ei tubeis ettaeheet en being u d e t eehi -te h b ere th upp r-W l (fiof thebag a being. formed with anopening at a to receive tliQi IiKrjP on the canister and elemped. eh hd. he a d. p ning between he fitt hee ehdithe hiete ee h t .e ee ew eerteethe eu e pu po e o ec ri thete e te the ee-is ehiete he e ette e thebea- The portion a of the bag containing the epeh ha i terme e e e t e met eLe ,-P hP,. het y tr ing he a pe hes the .e hie ee e. placed n ei ed fromthe bag.
The. eeh en I iheteed. e e g a an Within h he the eee ibeame be enranged exterior thereto, with itsv lower .end sewed .te QQ a PQB Il h 'thee eidsh 9 en;eyhhde eh h h e pre xygen, air, or a mixture thereof, arranged. outide. the hes ih peehe r en entexteneien la e 9. 2 the h s a th utle h m th a d l. ;a .l eh.e ha e hhee ed by hhe t e he part of the fitting e which projectsthrough th aid beg.) h per h e the sai fit i g be n teased ta ule an pe v'i e w h e ereee-n e g a in the part he f ee te W h n he ee d e By h eee e em if he eehhsf-va t ef ehde -q h mehiphi tee, the. e mpr d ge th n h a cylinder can be, allowed, to expand into the hash hyye e th t t n he-pa ag u i e tt K a 'llhebaga is alsofitted with a connection t hs ihelfeh it eeh eleh ed th eep het re. ee .e .h;eee y .n .e1 er t n reeheehr l 'eh tteehe te t e has eta-ed ihele ehdeh l et e eiepli ee b he teneteft: heea inder Q schich f ha eeidihea T i ehhe bn fitt ngs th', te i tw and ep n d ly nt theehehi e eeredrw h hen openthQ Said. breathing erior of; said bag.
' breath ng. bag
ing in the bag a by the nut 00 a non-return valve 7 being arranged within a part 02 screwing on to the said fitting. The said fitting part m is formed with a spigot 00 which is screw-threaded to enable the supply tube from the source of the compressed gas, not shown, to be. connected thereto, say, by a h i hi'eiht Although the last described supply of compressed respiratory gas has been described as beingsupplied to the bag a by way of the canister h, it is to be understood that it may be supplied directly to the said bag.
2 is a non-return valve connected to the bag ct and made in the fornr of a flattened tubeofi rubber, or likeelastic material, having elite e e1 he eel e-r e e ee se m; h a d he es het e te P e u which tends toclose the valve by pressing the flat i e e a t he e th From the foregoing it is to beunderstood that the user of the breathing bag has three separate sources of r espirat )ry gas upon which to rely.
The valye emay be arr angedsothat it can beea sily closed, for example by meansv of a tap or clip', if the apparatus be used; in a poisonous atmosphere. Or, instead the f exi le v e h l-fl x b e theturn a y h e p e e t allow e e iee' of het e er e eh e h inery a ein elhp ey d e=e e th eh et fie he the apparatus is used. in poisonous, atmosphere.
a? a? and o -a indicate pairs of straps on the bag a for securing. the said bag and its fittings in position for use, tl 1e strapso? exehd -ng e u eh heneek, e d h r pe around he he y. e h teen a a are a pair of straps on the mouthpiece which are secured around the head of the .user.
It; is to be understood that the canister k asshowmpreferably comprises the device described in the specification of; the co-pending t shp en pplieatien Ne- 2,3 0, date the 19th. July, 1929.
A eat ng. appar us, omp i g a breathing bag, a canister containing an absorbent of carbon dioxide arranged in commu ca ion with aid bre h ng ag, a thp e e pe a iv ly eenne edz here e, a cylinder, charged with a respiratory gasfunderp e sure i va ve e ntr dco mu i tion with. said breathing bag to furnish the J rma supply f. b ea hi g g to s id bag, and. a l ast on c psule. ha ged. with, a respiratory gas under pressure disposed within bag'insuch a. position as to ,bebreakable to liberate an emergency. supply of'gas intothe said breathing bagbya wrenching movement applied from the ex- 2; A breathing apparatus, comprising a ,a canister containing an absorbent of carbon dioxide arranged in communication with said breathing bag, a mouthpiece operatively connected thereto, a cylinder charged With a respiratory gasunder pressure, a fitment in communication with said breathing bag, a valve for controlling the flow of the normal supply of breathing gas from said cylinder to said fitment, and at least one emergency-gas capsule mounted upon said fitment and disposed within the said breathing bag in such a position as to be breakable to liberate an emer: gency supply of gas into the said breathing bag by a wrenching movement applied from the exterior of said bag.
3. A breathing apparatus, comprising a breathing bag, a canister containing an absorbent of carbon dioxide arranged in communication with said breathing bag, a mouthpiece operatively connected thereto, a cylinder charged with a respiratory gas under pressure, a fitment in communication with said breathing bag for controlling the flow of the normal supply of breathing gas from said cylinder to said fitment, and at least one capsule charged with a respiratory gas under pressure detachably mounted upon said fitment and disposed within the said breathing bag in such a position as to be breakable to liberate an emergency supply of gas into the said breathing bag by a wrenching movement applied from the exterior of said bag.
. ROBERT HENRY DAVIS.