USRE15673E - George t - Google Patents

Description

3 2 9 1 4 1 a u A G. T. PEARs'oNs FIRE EXTFNGUISBER Original Filed June 28 1916 @n no Reissued Aug. 14, 1923.

UNITED STATES PATENT v GEORGE r. PEARSQNS, or New s me. Y'.

FIRE EXTINGUISHER.

Original'No. 1,381,657, dated June 14, 1921. Serial No. 106,322," filed June 28,- 1916. Application for reissue filed February 4,1922. Serial No. 534,270. V i

Fire Extinguishers, of which the following 1 is a specification. I This invention-relates to syringes to be used as fire extinguishers, in whicha stream "or 'jet of liquid is ejected from a reservoir by piston mecl'ianism within the reservoir, and it is the object of the invention to provide improved means to at all times connect the piston chamber withthe' liquid in the lowermost part of the reservoir todiscl'iarge the liquid whether the reservoir is full orpartially empty,"o'r' held ina' horizontal psition or inclined'upward 'or downward from cent opposite ffendsl-to connect -the cylinder c horizontal. A

A further object ofth'e invention is to provide improved means to seal the pump "ing mechanism to pr'e'vent leakage when the syringe is not in' use.

In carrying out the invention I provide a reservoir or tank and mount a piston chamber therein having suction means to connect said chamber with the reservoir, and

(OllllBCta: flexible tube or tubes to said suction means to extend longitudinally of the reservoir with inlet 0 enings thereto adjacent opposite ends of t e reservoir, and said openings adapted to automatically assume a. position in the lowermost part of the reservoir when the'syringe is held in a horizontal or substantially horizontal position, and

provide valve mechanism to shut ofi one of the tube inlets from the suction means to the piston chamber and connect the other" tube inlet-theret 'to discharge thejliquid 'fro'mthe'reservoir wlgen it is held'in differ: 'entiangularpositions relative to the horn In the drawing accompaanying and'form-' which the construction of the pumping mechanism is substantially the same as that disclosed in my copending applicatlon filed January 15,,1916v Serial No. 72,207 (patented February 13, 1917, No.1,215,698) in which after set forth.

there is provided a reservoir or. tankfor a fire extinguishing liquid consisting of; a body portion 1, preferably cylindricallin shape, and the ends 2 and 3 secured thereto, as by soldering or otherwise, the-end 2 having a discharge" outlet 4 andva filler opening closed by a plug'5 and thesaid plug being constructed with an inwardlywopening and outwardly closing; spring check valve topermit entrance of air to; the reservoir as the liquid -is.dischargedtherefrom-shown in a general-wayby dotted lines. The end 2 is preferably: dished to i permit of standing of the syringe upon ar;horizontal surface. m i

- Mounted in the reservoiriat one side of the axis ofthe cylinderiadjacent' itheyside is a piston chamber or acyl-i'nder' '6 having. inlets 7 and 8 with-inwardlylopening fand outwardly "closing check valy'es 9 and-'10 adjato the reservoir. Th cylinder'eir-tend's from 'the' end of the reservoir opposite .-tothe outchamber :11 5 which is 'intlie nature-of a compression chamber in which th'liquid dischargedinto "said chamber from the piston chamber is placed under pressure :A'tube 12slidably engages in a stufiing box 13 in the cylinder end, said tube extending through a cap 14 into a hollow piston rod15ysaid cap being secured t and closing one'end ofthe piston rod and to which cap the tube 12 is fixed. The'piston rod extends through a stuffing box- 16 't o the exterior of the cylinder and reservoiropposite to'the outlet 4 and has a hand grip 17 fixed thereto, said stuffreservoir 'end' {3 in a 1 manner to be =lierein- A pistonihead 19 having siuitable packing to seal it fin'the cylinder is mounted on:the

' piston rod 15 to have a limited-to "and'fro movement betw'eenythe cap 14, which is in the nature of an abutment, and'an' abutment or collar-20 fixed to the piston rod." The piston rod is connected to the cylinder 6 through ports 21 therein controlled by the piston head -19 to alternately connect the;p1s

ton rod'and the tube 12 withlhejcylinder at opposite sides of the piston at the commencement of each outward 'andinward stroke of the'piston', and for which purpose the opening in the'niston is made of somewhat larger-diameter than the diameter of the p15- ing box being carried by a nut '18 which also serves't'o connect; the piston'chamberto the ton rod to provideeaspace therebetween and communication trteen sai d space and the piston cylinder is shut off by the abutments l4 and 20, for which purpose the abutmen 5 are provided with cone shap'ed ends 22 and 23 to cooperate with correspomlingly cone-i inafter described.

Inoperation,assumingthe parts to be-in. the normal-position shown in the idrawing, as the piston rod is pullednutward and with it; thestllbe 12,-the piston. will-move with=the 'l Lrod due-to the engagement of the piston-With t the abutment l l, the said engagement of-the piston with the abutment :con-necting the piston chamber at the rear-of; the piston to the piston rod and shuttingoff coinmunication between the Pistonrodiand Lpiston chamber -at-:the' front-of the piston. During this anovementbf thel piston liquidwill-bedrawndrom'rthe reser voir into theepiston chamber through zthe inletfi' in fronbof theflpistone while :the' air at the :back of the piston will be ejected through =thei-pistonsand pc'rtsfil- 'into; the ;piston rod: and --from the: piston {rod through rthe tube l2 into-thechamber ll a'nd from the latter through thetube'24 and discharge'o'utlet. ;During theinwa'rd movement. of the Zpiston. rod it will have a slight free,

movement independent .of the piston until. .the' piston -;engag;es with the abutment 20, this movementof thepiston connecting the icru'a-rd end of thepiston chamber through the piston and ports 21 with the piston rods and during, the inward movement of the pistonsthe liquid previously drawn into the piston chamber in front lot tl1Q'-plSl30I1-:Y.illl

"- be ejected through theapiston and. portsfEZl "into the piston rod, and" from. the; piston rod -:;through the tnbe,12 into the chamberll and 'from said chamber through the tube 24: and discha rge .outlet. By .-having. the tube 120 t greater diameter than. the tu-be24 the volume ofL-Iiquidiin'the-ehanrber 11.WilLbegZreater -tha.n that which canbelejected fthro'ughthe tube-fl lrcrfeating a pressure in thecharnber ill with :the ;result that-the liquid -.Wlll.-;l)

"-=- ejected through-the-tub'e 24 With increased -"f6rce;.\andit-he outlet whichis restricted with lGlftt-lbllszlifi :tl1e-*tnbe; -24c will still further fci'eate 50. Pressure :and increase the-force: of the :stream rejected through' the :outlet 4.-

-' :00 Dunmgithis' forwardimo'vement of the piston liquid- -W-ill be drawn into the in back Of-13116 piston. Y, The piston-chamber is preferably located v .at oneside-of the center of the reservoir-and pistonechamber .to draiv the liquid from the lowermost part The area or diameter of ot the-reservoir I connect a flexible tubing to ithi suction means of t eilpiston chamber,

said tubing consisting of what is commercially termed flexible metal hose, comprisin'gfspirallyWound and interlocking or jointed sheet metal with asbestos packing in the joints.

. Inthe embodiment show-n two; sections of tubes 25,125 are connected at one end to a T-shaped intake or valve chamber 26 having a part: extending in a plane longitudinally andwro-axially of the reservoir with inlets in opposite ends, saidintake being common to both of the suction inlets of the piston chamber, said tubes extendinglongitudinally of the reservoiruith theiree end of theinlet adjacentoppositejends ofthe reservoir. The nature of this tubing is ;s-U.'Gh ithatlit has a universal flexing movement and to cause the :inlets 21:0: said tubes to automatically .assumea position till. thelowermostpart of the res ervoir.-the ffree-fend ;is weighted, as shown Theintake 26 is ,directly connected to the inlet TEQf-thepiston chambe yasiatifi, and

as .showns may: be.-;con structed to form the seat'efor the-valve 9, gand-is conneetedito the inlet 8 byna tube 29;;througlracoupling- .30

constructed to form theseat for the valve 10.

The intake is preferably loqatedisubstam ftiallyimidway between theends of-ithe reserfvcir withhthe T-portion thereot located at .fsx'n ned-istance from theside of the reservoir,

as shown and by which: construction the amount of fiexure iofi the tube required to cause the inlets thereto tov assume a. position ad aeent the sideof the reservoir v1ll be materially (reduced; 1.

1 i ltw-ilhbeobvious that shown, the

ends of'zthe tubingmssume.auposition at the .sitlc of therescrvoir which is; d irectly oppo- {site 0 2 below the piston chambegshould the syringe be held in-a positionnyvith the piston chamber at thebottomthe inl ends o f,the tubing will assume aposition adjacent said piston chamber, andtliello vermqst part of e s v v 5- To ,disc-hargethe liquid, fromsthei reservoir .with the discharge endofthe syringe tilted upwardor downward-relative to aborizontal position, :valve mechanism' is provided .to

automatically shut oll the inlet ,tothe t-ubing which is uppermost from the intake 26 and connect the; lowermost inlet, to. the tubing t-hereto. said valve nieeha nism consisting of 'a pair of valves 3lgto cooperate w th valve seats 32 connec-ted ,to orfformed inthe ends of the T-portion of the intake 26, andsaid valves being connected bya rod :33.--of greater length than the T- portion of the intake so thatiwhen'one oLthe valves is seated the other will be unseated, as. clearly. shown.

= The piston chamber, as inithe: application hereinbeforereferred to comprises a cylinder having adriving fit with the ends fic and lll) ' and in which the suction inlets 'T and 8 are located, the piston chamber being clamped to the reservoir end 3 by the nut 18 cooperating with the end 35, the said end having a bore of the same diameter as and which may be a continuation of the cylinder bore and at the'outer end internally screw end 3.

threaded for the engagement of the nut 18 whereby to permit of the drawing ofthe piston mechanlsm by the removal of the nut 18. To properly position the pumping mech anism the end or head 35 has a projection 36 to engage in a recess 37 in the reservoir To seal the pumping mec-hanism'to 'pre- 'yei'i t leakage when the syringe not in use, "I provide'a tube .38 connected to the Stuiiing boxl3 'and jin which the outlet end of the reciprocable'tube. 12 engages, this "tube 38 being of a length-to extend adjacent 'the discharge nozzlea'nd carries a valve at its free end to engage with the discharge e'nd of tlietube '12 when the piston is'in ltS' inner-most position, thisyalve consisting of "a disk 39 carried by .a-cap connected to the end of and causedto be' move c li i'n adircction towiird thetube '12by'a spring- 40. T e rst; ba gni tfi m new. n 'c nb 'i' 1& t ou hlla l' 'pd 'ts'ifl When the syringe is in'use' the inward m'ove- I meiit 'ot'the valve is'limited'by theengage- "inent' thereof with the end of the. tube 38.

'Th'e ltiibelfl is of such length that when' 'the piston rod is infits innermost position the end of the tube 12 will engagepartly in the'ca-p 39 and thevalve will be firmly springL iO. flo locklth p sjlton in itsinn'er- "most positioniwith the end o f'thetub lQ" closed by the valve, I provide cooperating forced against the endotth'e tubelby l the locking parts on the piston'rod and reservoir consisting of a projection dripni 42' extending laterally 'ifrom ith'e piston rod f andwhich is adapted to cooperate with a 'caiuslotj 13 ma annular extensio'n of the 1 m The reservo mayb di id i u 1 nallyliy. pa ial-1. in P ov two chamber's'in the reservoir one inl'j'vhich pimp g me n may b mad mthe other for the fire extinguishing liquid in whichthe intake for thepunipijng meehanism .en'ga es.

Having claim h is Ina syringe, the combination with a described my :invention I reservoir having an outlet, of a piston chainber;a piston to reciprocatein said chamber; a tube reciprocable the piston 'to connect the piston chamber with the outlet of "the reservoir; and a valve to cooperatewith the outlet end of said tube when the piston "is in its innermost position, substantially as and for the purposespecified.

2. In a syringe, the combination with a the? compression chamber reservoir having an outlet, of a piston chamher; a piston to reciprocate 1n saidchamber;

a compression chamber connected to the reservoir outlet; a tube recipro'cable With'the piston to connect the piston chamber with the compression chamber; anda valve in the compression chamber to cooperate with the outlet'end of said tube when the piston is in its innermost position, substantially as and for the purpose specified.

3. In a syringe, "the combination with a. reservoir having an outlet, of a piston chamber; a piston" to reciprocate in said chamber; a tube reciprocable with the "piston and through which the liquid is discharged from the piston chamber; and means to connect the sa-id-tubeto the reservoir outlet including a valve to cooperate withthe end of the tube when the piston is in its innermost position, substantiallyhs and for the purpose speci- 431m a syringe; the combination with a reservoir-having an outlet, of a'plston chamber; a piston o rec procate in sa d' chamber;

fa compression'chamber' connected to themes-"- e rvoirf outletf; a tiiberec iprocable"ii ith the piston to) come-state piste-11' chamber with v a rod to recipro- Cate the "piston and tube valveiii thfbhflpres'si0n cliamber to'5o erate iy ith the end of the reciprocable" tube within Jsa' id" 'chamb'er to 'fclose'sa-id end of the tribe whe'n jthe piston is' {its innermost position," substantially' as and forthfe'purposspecifiedf a syringe?th eg lconibination with a reservoir an ontleh of a "piston chamber; apiston as ieci'proc'atein said chamber;

, compress'ion chamber connected to the rese'rvoir 'outlet;a"tube reciprocable with the piston to connect the piston ch and her with "the compressibn chamber; a rod to reciprocate thepistonand'tube; a valve'in the compre's sio'n; chamber to cooperate with the 'end of the'reciprocable tube within saidchainher t0 'cl0se said 'endbf the tubewhenthe piston is in its innermost position and '1 cooperating locking means carried jby the -pistb'n rod and reservoir'tom'aintaih the piston mechanism pb'sitioii' fwi'tl i 'the' tube closedby the valve, mtsmnnnly as I an the 6-. a spectre i i n f h'i i reservoir having an outlefijof a pistoii'charnber; a piston to re cfiproca te in said 'ehaniber a compression chamber coiin'ected to thefreserv'oir'outletg' a tube reciproc able with the pi'stonto connect the piston chamber with compression chamber; a rod to reciprothe piston and tube a tube in the compression chamber fixed at one'end to the piston chamber and the other end extending adjacent the reservoir outlet in which the reciprocable tube engages, said'tube having lateralports /to connect it with the compression chamber; a spring influenced valve III;

. operating locking means carried by the piston rod and reservoir to maintain the piston in its innermost position with the end of the reciprocable tube closed by the valve, sub-- ,stantiallyas and for the purpose specified inner. end of thepiston chambeig means toconnect the piston chamber \viththe second .chamber; .pistou mechanismoperable in the v piston chamber to alternately draw liquid site. sides .of'..,the piston into said. secondv .450

7. In a syringe the combination of a liquid carrying reservoir having an-outlet, ot' a zfixed piston chzunber; a second chamber exterior of the piston chamber and at the .from the reservoirto opposite sides of the ,piston. and dischargo the liquid fromaoppochamber; valve means operablewithin said second chamber to shut off communication between the liquid in the reservoir and the the piston againstmovement.

, esgterioreo'f theresorvoir; and means to. lock .8. lnaafire .ezgtingui her the combination. pf ,a ,container. for .fiuid; havingsan. putlet,

;o;E,-,a .piston chamber a secondchamber; ,con-

.nectedto the piston' -chamber and container k w en??? h ng nes-erm ne lela one to the pistonchamber a ndfiischargegit into v.

outlet; piston mechanismto -;cl'rai v liquid .Said second chamberv ,from opposite sides ,of

.rthe piston; and valve means containedwithin said second chamber. to open-up and shutoff communication between: the piston and said second chambers for. v the. purpose specified. 9;. .In. ,a: syr1nge, the combination-grams- $237011 to contain. a fillld. and having. a discharge outlet; apiston-chamber supported in a -fixed position in communication with the reservoir and connected at opposite ends with the reservoir; v a chamber locatedatthe inner end f,the pistonchamherconnectedto theupiston chamher an'd thereservoir outlet ,in, which chamberthe liquid ..disc harged thereintoirom the: piston chamber .is,p1aced .under. pressure; piston mechanism. to alternately. draw, liquid from the reservoir topp- ,1 )osite-.ends of :the ,pistonphgrmber and disa charge it into the second -chamber;.a,nd--.valve v mechanism within.;the,; seco nd chamber op-.- erahle by the action of thespistonmeohanism to ope rup andfto shut .ofi' communication ,hetween the pistonchamber and the exterior QfLt'he reservoir; ,an d neans to lock the pistgmflin' its ;inne rmost.position.

.10. lna syringe the combination of-a resl'ervoir, having a discharge outlet; a piston chamber, supported in ,autixe d position in com- ,.municatio i with :the (reservoir; a compressi onchamber to connect-the, piston chamber atmneend tothe, reservoir outlet; a piston; valve mechanism to control ,the; entrance of liquid to and ,its dischargefromthe. piston chamber at oppositesides of thepiston; and avalve o perable when thepiston is in its innermost position to shut off communication between the piston and compression chambers, for the purpose specified.

11. In a-syringe, the combination with a reservoir having an outlet, of a piston chamber; a piston to reciprocate in said; chamher; a tube rec'iprocable with the piston to connect'thepiston chamber With the reservoir outlet; and alva'lve tocooperate with said-tubeto seal the reservoir outlet.

12. In a syringe the combination with a liquid carrying reservoir, having an outlet, of pumping mechanism including a piston chamber and a piston to reciprocate idsaid chamber .a tube reciproca-ble with the piston tofconnect the piston chamber with the reservoir outlet; me-ansconnected @to the pumping neehanismto draw liquid intp the piston chamber from near that portipn 301?. the liquid reservoirqvhich is lowermost; and a valve exterior of the, chamber to: shut pfi communication between the pu g m hs j nge ic s e iq 9 .li id se will? YilV s wil 9 'z nls ,pprti qse ,shamber .adii i t .e ipp t fi nds hemef; a

lithe use. chamber qnp si s hw e es hemi ease qmmum t ee ith the-..

: ervoir outlet 0 valve, [controlled outlet" ports h tes be s d 1se dtseceiidrhe hers an :v re m eh iee. -s rib ftef t m ster ch mb pe a l w en :pi tn in T4. In' a. fire extinguishers liquid carryns s einheri g i'iiseha g u ts' a p o Chamber ni'seii m' ii iqh wi sk reservoir; a piston to reciprocateiin chamber; a s t n 1 n rtetfietthelri c mps adjeqeiit epiiee 'i e si lle 0f; a se nd' heii beisxtsx bxf i;thepistenf ha e s'a dl et d. them she .qithsgpis die bere semieun o. Wit fthe se Yoir enemas: cont lleg m nsii .0 -trol the' discharge of liqu i irorn opposite sides ,,of the piston. through said j second chamber "and the' reservoir outletfflva-lve mseh n smnp mbl i in h s o i f' b e'i' when the pisto is in its innerinost po-' fr omlthe reservoi rf outlet. U

, l fn.' i 'gu sh na iquid serr- :in'g reservoir having an. outlet; at fixedpiston .chambergg .a piston to iee'iprocate said chamber; jvalve controlled ,inlet pol-ts; adjacent oppositeen ds of saidfchainber in comuni i n' with: t e ese r ir e r s chamber located at the inner end of the pis ton chamber to; .connect the piston chamber with the reservoir outlet; means operable in said chamber when the piston is in its innermost position toshut off communication between thepiston chamber and the reservoir. outlet and operable during the initial outward movement of the piston to open up communication between the piston chamber and reservoir outlet; andmeans to lock the piston from movement when in its innermost position.

16. In a fire extinguisher, a-liquid carrying chamber having an outlet; a iixed piston chamber in communication with said liquid carryng chamber; a piston reciprocable in said. chamber havingwan operatinghandle; valve mehanism to 'control the entrance of liquid to and its. discharge :from the piston chamber at opposite. sides o! the piston; intake means; in communication .with .said pumping mechanism to draw liquid from i near -.that,.port ionof said liquid carrying 1 b hich.is lowermost during ,the p1,, ra io i- 1 e fpis a; s nd a aubes located at. the inner end; of. the. piston ch a1nber opposite the-handle to connectmheqmmp chamber with the greservqil". :outlet andvalve means. in, said second i/ehan ber. open:

able; by the; action 1 .ofithe pisto nmejchanism.

to shut off liquid communication betwecn, the-liquid chamber. and-the exterior of said chamber.

--17; In a fire extinguisher. the combination ofaqchamberior carrying liquidhaving an outlet;- reciprocable p ston pumping mechanism in communication; with said chamber;suction inlets adjacent .oppo site endsiof the pump; .means to discharge the liquid from-the .pump chamber at opposite si es of the'pistou; intake means in said. chamberin communication with said suction inlets arranged .to operate about, an axis transverse to the axis of the pum p chamber andarranged to draw, liquid from near that portion,v of the liquid carrying chamber which is lowermost. in whatever position the reservoir may be held during the opera-. tion-of the. pumping. mechanism; a second chamber located atthe; inner end. of..,t-he'..

and the exterior of the reservoir .reservoir which. is lowermost; ,a ,chambe .outlet; means in- ;sai d when the piston of thepumping.

.ervoir outlet; and valve mechanism-"in;-

said latter chamber operable by the action of i the pumping mechanlsm; to shut off 'commun lcation between the liquid in the reservoir l9. In a fire extinguisher,..the.;combina tion of a liquid carrying reseryoir, having aind outlet; pumping n'icchanism, having afixed 30 pump cylinder with suction inlet ports ad 3 jacent opposite 'cndsof thepum j cylinder and means to discharge the liquid zfrdm op .posite sides of the piston, in communicatipqf with said reservoir; intake ,means;to s.aid pumping mechanism arranged.to assume a posit on by gravity near that'portion of the arranged to. connect;said intakefineans ltoi h s c in e a chamb r a the-J me; W endof the pumpingumeehanisn lto connect the pumping mechanism wit t I i an iii neitt commumcatronbetween thelxgrnd he I reservoir and the. exterior of the ,resfery oir is in its inner positiona of a-chamher for carrying a, liquid. andv having an outlet; a reciprocable piston mechanism andfixed piston chamber in ,comm=uni cation with. said liquid carrying chamber; means to reciprocate the piston including a handle located at the end oppositethe out let; suctioninlet means'tothe p1 ton chan her in communication with the liquidcai'ifye; ing chamber; intake means to the inlet means of the piston chamber operahle by gravity,

and pendantly supported. to move (about, an axrstransverse to the; axis of the piston.

cylinder, said intake being in the liquid. car- I ryin chamber and operable to connect the piston chamber with the liquid near thatpo tion of the liquidcarrying.chamber whijcl if s lowermost a cliambei: .loc 'ited att e f end of. thepiston chambet H iminechanism'. p ra-ma n seia limb: to hu ifi munication between tlie. "p'uin1iani:l the 'e'x terior of the liquid carrying chamber.

21. In a liquid projector, a liquid carrying chamber; a pump to discharge the liquid from said chamber including a cylinder and a reciprocable piston member having an operating handle; a chamber located at the end ot' the pump cylinder opposite to its operating handle and having an outlet; means within said chamber positively operable by the reciprocable member to open up and shut off communication between the liquid carrying chamber and the outlet; and

meansto lock the piston in its innermost position.

22; In a fire extinguisher, a reservoir for a liquid, having a discharge nozzle; a pump comprising a. cylinder and a reciprocable piston; a chamber at the inner end of the pump cylinder in communication With the liquidreservoir; a passage leading from the nozzle'to the chamber; means in said chamber; posltivel} operable by movement of the piston to open up and shut oif communi cation between the liquid reservoir and the noztleorific'e; and means toloc'k the piston against movement.

- 23. In a liquid projector, a 'liquid cham her with an outlet; a pump operable to discharge the liquid from said outlet; said pump including a cylinder and. a reciprojcable piston having a handle; a member "reciprocable with the piston; a chamber located at ,the end' of the pump cylinder oppositeftothehandleto connect the liquid ch'ziiilbi-With the outlet; means in said chamber operable by the member recip-ro "cablewith the pistes -'to" open" up and shut off; communication between the' liquid chamberand the'outlet'; and means to lock the iston' ia its innermost' position.

'24. In a"fire extinguisher, a liquid carrying reservoir having a discharge outlet; a fixed piston chamber-in communication with the liquid in said reservoir; a piston to reciprocatein said chamber; a chamber located at the inner end of the piston chamber and in communication with the piston chamber and discharge outlet; and valve means within sa d second chamber to shut off communication between said second chamber and the piston chamber with,- 4n" the discharge outlet open to said second chamber.

25. In a fire extinguisher a liquid carr v ingchamber having means of discharge; a reciprocable piston pumping mechanism having a handle and located outside of said liquid carrying chamber in communication with said liquid carrying chamber having several suction inlet ports to the pumping mechanism;"valve mechanism to control the entrance of liquid to and its discharge from the pumping mechanism; intake means in communication with the suction inlet ports and located in the liquid carrying chamber operable to connect the pumping mechanism with the-liquid near that portion of the liquid chamber which is lowermost; a chamber located in the line between the pumping mechanism and the outletof the liquid carrying; chamber; valve means in said chamber to'shut ofi' communication between the liquid carrying chamber and-its exterior.

26. In a fire extinguisher, a liquid carrying chamber having an outlet; a reciprocable piston pumping mechanism hzwing a handle and locatedoutside of said liquid carrying chamber in communication with said liquid carrying chamber-having several suction inlet ports to the pumping mechanism; valve mechanism to control the en'- trance of liquidto and its dischargefrom the pumping mechanism; intake means connected to thesuction-inltats and located in the liquid carrying chamber operable to draw liquid from near that portion o'fthe chamber WliiClilS lowermost; a=chambe-r '10"- cated inthe line between the pumping'mec'lb an ism I and the outlet ofthe iliquid carrying chamber; valve means in said chamber to e shutcit communication be-tvveen fthe "liquid carrying chamber and itsexteriorfandfa shielding means V operable to protect the pump cylinder and mechanism'agaihstfdent' and accident.

27. In a fire extinguisher; adiqui'd carrymg reservoir having an outlet; at fixed"- piston 'cliamber;- a reciprocating piston mechanism operable by a handle to recip-- rocate-in said-chamber; valve controlled in-- let ports adjacent opposite ends of said"- chamber in communication with said reservoir; a chamber located'at the inner end-of the piston chamberppposite the handle-to connect the piston chamber with the resetvoir outlet; means reciprocable with the enog r. reaiisoNs-

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