US1878472A - Fire extinguisher - Google Patents

Description

Sept. 20, 1932. F. A. DoDELiN l FIRE EXTINGU'ISHER Filed March 14. 1931 2 Sheets-Sheet 1 7 ,w 0 M M 1 d Z 2 mi 7 Wd /4 i. NN

ATTORNEYS.

Sept. 20, 1932. F. A; DonELlN `FIRE EXTINGUISHER Filed vMarch 14, 1931 2 Sheets-Sheet 2 Sil' Patented Sept. 20,` 19.32

UNITED STArEsArENr oFFlcE l b FRED ALRER'L` DoDELIN, 0E GLEN RIDGE, NEW JERSEY, AssIGNoR To PYRENE MANU- FACTURING COMPANY, E NEWARK, NEW JERSEY, A CORPORATION 0E DELAWARE Application led March 14, 1931. Serial No. 522,645.

This invention relates to lire extinguishers ofthe type shown, described and claimed in United States p tent granted to kleter G. MacGregor, June17, 1930.

An object of the present invention is to provide, in a fire extinguisher of the type above identified, certain improvements which relate particularly to the valve ,mechanism forsimultaneously controlling the passage of Another object of the invention is tofpro- Y vide a Y.novel and effect-ive means fortying the heads of the extinguisher ,together in such .a `manner as to lend rigidity and,

strength to the fire extinguisher as a whole, and particularly tothe one head common to the pressure chamber and the fluid chamber so that such common head Imay be so reinforced as to enable it to be made of rela-y tively thin metal `and'yet withstand any and all pressures to which it may be Ysubjected from within the extinguisher.

To the above and other ends, the invention consists in further improvements. and` ar- L rangement of parts,all as will be more -fully described, the novel features being pointed-v cut in the claims.V

In the drawings: Fig. 1 is a view partly in section and partly in elevation of a fire extinguisher embodying this invention; Fig. 2 is an enlarged central, verticahsectional view taken on line2-2 ofFig. l'andin detail the pressure and liquid valve mechanism thereof; Fig. 3 is an enlarged fragmental, central,VK

C sectionalview of the Vcheck-valve assembly for the pump Fig. 4 is av horizontal sectional view taken on linee-afof Fig. 2; Fig. 5 is a horizontal, sectional View taken onv linev 5--5 of Fig. 3; Fig. 6 is avertical, sectional view` taken'on line -ffof. Fig. 3,; Fig. 7 is a somewhat enlarged View in elevation ofthe upper end of the extinguisher of Fig. l; Fig. n 8 is a plan view of the extinguisher, as viewed from above vin Fig. 7; Fig.,9 is an enlarged` central, vertical, sectional View of a shut-off valve taken on line 9*97 of Fig. 8; Fig. 10 isaview, partly in elevation and partly in section, of a pressure and liquid valve mechanism, which is'slightly modified withrespect: to the valve mechanism of Fig. 2; and Fig. ,11 is a horizontal, sectional view taken on line 11-11 of Eig. 10.

The extinguisher, herein shown, includesa l Y 'pair of heads 10 and 11, the former of which is preferably kof cast metaland is provided with an upstanding flange 12, and the latter of whichis preferably a sheet metal stamping, so formed as to provide a peripheral dependingflange 14 andan upwardly extendingpocket-like recess having a depending peripheral y.wall 15. Further, the extinguisher includes a liquid chamberfl, thel lower end msA of the cylindrical wall of which is confined within the flange 12 and suitably connected to the head l0 to forni therewith an air and liquid-tight joint, the upper end' of suchwall being confined within the flange 14 andsuitably connected to the head l1y to form therewith an air and liquid-.tight joint. V,Arranged within the liquid `chamber 16 is a pressure chamber 17, theupper end of the cylindrical wall of which is confinedY within the dependi ing wall 15 of the head 11 and; is so connected thereto asto form with such head an air and liquid-tight joint, the lower end of the chamber 17 being spaced an appreciable distance from thebottom of the liquid chamber 16v` and,v

provided with an end wall 18.. Y

- j Disposed within the pressure chamber 117,:`

is a yerticalpump cylinder19, the upper end of which projects through the head 11 tof which itis suitably connected and the lower jendvof which is embraced by 'and suitably securedV to the upwardly extending flange 20 l i of a check valve housing 2l, which'constitutes 13, hereinafter more particularly described. Within the-pump cylinder 19, is arranged a Y ;v Y one element of a-pump check-valve assembly j 10o Vl ber 25, carried on the upper end of the pump cylinder. The outer end of the piston rod 24 lcarries a suitable handle 26, by which the V'upwardly by a coil spring 34, carried by the piston rod and disposed intermediate said collars. rEhe pump, hereinshown, is oi the singlelacting type, itsA piston 22 being such that it permits air to pass therearound on the upward stroke and such that it is caused'to expand when acting on the air below the same during the compression'stroke. i

Leading from the lower end of the pump, isa pressure tube 35, which extends upwardly tothe head 11 where it is connected to a valve block36, the valve block beingprovided with air ducts 37 and 38 vwhich maybe placed in communication with each other, when desired,vby a suitable valve hereinafter more particularly described. This valve.v block is connected to the head 11 in an inclined position, and is so located with respect to the pressureV chamber 17 that communication between thatchaniber and the air pump maybel established by way of the ports 37 and 38 and the pi'essuretube 35. For the purpose of establishing or Ysevering communicationbetween the/pressure chamber and theA air pump, there is provideda needle valve y 40, the shaft portion of which is screw-thread# ed, as shown, and is adapted to engage similar screw-threads formed in the central borey of the valve block. The valve block may be provided with a suitable packing 41, disposed about the shaft portion ofthe valve, the'pack- 'ng being accessible from the exterior of pump checkevalve assembly 13.

the eXtingi'iisher lupon removing its associated A' gland nut 42 carried by the valve block; To

the outer end of the valve shaft,is connected a' thumb wheel 44,v by which the valve may be moved into and 'out 'of seating position to,

respectively, sever and establish communica-y tion betwten the pressure chamber andthe air. pump, it being understood that the `valve is to'beopen during such time as the pressure chamber 'vis being charged by the pump and is to be at all other times maintainedclosed asV a 'precaution against possible leakage of air from vthe pressure chamber by way of the- The-housing 21 --of the check-valve as` se'mbly"Y 13 'hereinbefore mentioned,V :formed with ajsvhoulder 43 `which rests on thebottom wall 1 8`of'the pressure chamber and includes a v reduced shank jportion 45 f which projects throughsucli =wall and ispro-b` Lara/ira vided with external screw-threads adapted to receivea clamp nut 47 between which and said shoulder the bottom wall of the pressure chamber may be clamped. Within the central screw-threaded bore 48 of the housing 21,' is disposed avalve unit 50, which includes a screw-threaded head 51,'ha-ving a peripheralvgroove 52 which serves as an air passage `adapted to communicate with the air pump Vthrough aipair of vertical ducts 54 which extend through the transverse wall 53 ofv the housing intermediate the pump cylinder 19 and said valve unit. This annular air passage 52 communicates with a plurality of radial ducts 55, formed in the head 51; and these ducts, in turn, communicate with a central duct 56 leading intoa valve chamber 57 within which is carried a ball? valve 58,`

normally held in seating position by afspring-L pressed plunger 60 of standard design. In

thewall of the valve chamber 57, are `formed a pair of openingsl, leading from `that chamberrtoan air rpocket 62, withinwhich the valve Chamber is located and from which leads the pressure pipe-35. Fromthe checkvalve kassembly 13 thus far described, it willv beV apparent that as air isV compressed infthe valve' 58'from its seat,` but as soon: as the `compression stroke is completed, or rather as soon`as the force. of compressionis no longerV vsulificient'to cause a passage i of air from the pump tothe pressure chamber, the valve 58 moves Sinto seating position where it is firmly held by the spring-pressed plunger,r

60, thereby preventing back-flow of Apressure from the pressure chamber to the pump,`the' ball remaininggseated during the intake or suction stroke of the piston.l Upon introducing the desired pressure into the'pres'sure chamber 17,. which may ber-determined by` a suitable pressure ,Y gauge 64 carried bythe:

head 1l, the needle valve 40 is fclosed, there'- by severing communication between the pressure fpipe 35. and the pressure chamber 17, soas to guard against ,any possible leakage of pressure vback into thelpump by' way of the check-yalve'58. If desired,pressure mayv be introduced into the pressure chamber 17 through a suitable. valve 65, secured to the head 11, the 'valve' being of a well-known checktype andf provided with a cap 66 whichY may be screwed down onto the valve stem to insure against valve leakage, as willr be readily understood. I

Within thelgbore -48 of the .valve-assembly housing21, is placed a .Suitable packing ma-V terial 67 which is held therein and in firm 'engagement with the screwethreaded head of the valve unit v50 -by a pressure screw 168 which, like such valve unit 50, may beeasily `introduced into or removedk from'the valve assembly by wayofi an opening 70 formed yiny thehead 10 directly beneath Athe housing 21 of such valve assembly.fThe packing 67, as will be readily understood, .serves to prevent any leakage of air past the'valve `unit l 5 0 during the compression stroke of the pump.

inasmuch as the pump lcylinder `19 is securedf at Voneendtothehead 11 and atits 'other end to the` housing :21' ofthel lvalve `assembly 13, the two heads 10 and 11, may

' be effectively tied'together with the Yaid of a lag screw 71,'the shank'of which projects through the opening 70 .of the head 10 and engages theV screw-threads fof thebore 48 of s "the housing 21. SuchV tying together of the under the influence of pressure ,withinV the pressure chamber 17, as will be readily under- `headslUand 11 materially strengthensl the extinguisher, as a whole, and particularly reinforces the head 11 Yagainst bilging upwardly under the influence of pressure within the extinguisher., Due to the effective reinforcing thus aforded, ythe head 11 may be made `from* relatively thin sheet metal, such as brass, which readily-lends itselfto-stamping operations andfthereby permits a considerable reduction in the cost of manufacture as Vcompared with' a cast metalhead which would require certain relatively'expensive metal ,working and finishing operations. Moreover, by the present structure, the eX- tinguisher head 11 and the bottom Wallv 18 @of ythe'pressure chamber are alsotied together through the pumpl cylinder 19- and the .housing 21 of the valve assembly 13; and, as

a result offthis tie connection, the bottom wall 18 is reinforced against bilging downwardly stood, thus Alending a further rsafety factor f f to the extinguisher, as a whole, and at the same time permittingl relatively thin sheet metal to be employed in the bottom wall of the pressure chamber with the yresult that such wall may be economically produced :by `suitablestamping diesV at a saving incost of "production as mentioned in4 connection Wit the head 1 1. f

' yUpon the headrll, isV mounted a valve mechanism 72, adapted to control `the flow of pressure from thepressure chamber 17 i to the liquid chamber 16 and the escape of4 liquidifrom the liquid chamberthrough an' outlet `pipe 73, which isA connected to the therewith. The housing 74includes` adei particularly described.`

pendingv portion7 6, which Aprojectsthrough the head 11finto the liquid chamber'` 16 and contains' adjacently disposed parallel v vvalve chambers 77 and 78, which 'are'screwethreaded f f and carry within thei'rrespective lower ends tubular screw-threaded :plugs -80 and 81, .pro-

vided at vtheir respectivev inner ends Vwith suitable valve-"seats, as shown. Within ythe i chambers 77 and 78, vare arrangedy pressure n and liquid controlling valveheads 82.` and'84,

respectively. f The lower ends of these valve heads are pointed or shaped kto vconform to* the respectiveseats of the plugs 80 and81 and are provided at their upperendswith f v radial notches and '86. The valve heads 82 and '84 are adapted to slidewithin tubularV gland nuts 87 and 88, which serveto hold suitable packing inthe upper-ends of the' chambers 77 kand 78,1 vthe f gland nuts being provided across their 'respective upper lfaces with suitableslots,fas shown, so as t'o'permit them to be easily introduced intolgor re-V -movedfrom the Vhousing 76 Vby the useof a suitabletooh'su'ch as a screw-driver,it being noted that access to the gland`nuts,and`hence to the packing which` these nuts normally hold in place aboutV the' valve heads 82 vand 84, may bel readily had from vwithoutfthe extinguisher uponremoving from thefvalve Y assembly the valve heads and thevalve-head actuating mechanism 90, hereinafter more The i above-mentioned valve-head actuating mechanism 90 includes a rotatableshaft 91, carrying at its upper end awinged'opf erating member 92 andprovided at its lower' end -with screw-threads`94, the lead of which is oppositev to that of V'the`screw-threadsi-95 provided on the intermediate portion 96l of said shaft. Carried by the' lower vscrewthreaded end of the shaft 91, is a nut or follower 97, having depending arms 98, spaced from each other and supporting Va pivotallymounted transverse pin 100, to which isconnectedv a yoke or connector member 10'1.dis posed intermediate thearms 98 and having its ends projecting into kthe notches 85 and186 of thevalveheads 82 and 84. Carried lby the intermediate portion96 of the-shaft'91 Y 1s aninternally screw-threaded bushing 102,'y y--the upper end of which is provided with a flange, resting upon the upper end of a connector member 104, lthe lower end of fwhich is screwed intothe upper endof the housing 741v and the lupper end of which carries" a' clamp nut 105, adapted to engage'the flange of the internally screw-threaded bushing 102 obvious, thel connector member 104 and the clamp nut lOjconstitute and servecolleci' andi-lock the same against rotation. vAsis l tivelyfin the capacity of `aclosure vfor theV upper end of the housingv74..

i From :the above 'detailed descripti'on'of y Y the valve-head' actuating mechanism 90 zitzjv' l v will bexapparent 'thatby lloosening'the clampl L?. d

.the gland nuts 87 and 88 `to permit their kbeing adjustedto compress the associated packing material or may be readily removed ftopermit the introduction of new packing :material into` the packingspaces provided in the housing vat the heads. 1

upper ends of the valve 4Also from -the above description of the -valveheadgactuating mechanism 90, itwill beunderstood that as the vshaft 91 isrotated, :the nut or follower 97 is held against rotation by reason of the fact that the upper ends of-thevalve heads-*82 and` 84, which are p movable only vertically, yproject into the space offeredbetween the arms 98 of such folslower. e r--clockwisedirectiom regard being had to Fig.,

If theshaft 91is rotated in a counteri threads95, willmove upwardly with respect to the internally screw-threaded bushing A102,

and thefollower 97, dueV to the lead of the Y screwrthread's 94, will ymove upwardly on 5x30 .the shaft 91, with the result that the' valve @heads 82 and 84 are lifted from their respective valve seats a distance corresponding to y i A the extent of longitudinal move'm'entof the shaft 91, plus theextent of movement ofthe follower 97 upwardly on that shaft. .Upon

A reverse rotation ,of the shaft 9 1,s uch shaft f'will move .downwardly with V respe'ctltofthe vbushing 102 andthefollower`97 will. move` vdownwardly on-the shaft91, thus causing the valve heads 8 2 and 84 4tobe moved d'own- Y. wardly a distance correspondingto the ex tent of the downwardmovement ofthe shaft A91iplus the extent of the` downward movement ofthe follower-97 with respect to that shaft. YIt follows, therefore,.thatthe valve Vheads may be moved, uponsulhcient rotation fof the .shaft v9.1, into firm engagement with theirfrespective seats, wherethey .are-*effectively held by reasonof theffact that the A dueto such upwardthrust on the valve heads g 82 and 84 as may be inherent by reason of theirhaving been forced into intimate en- 51135Ik gageinent with their'respective seats.

. As toaccurate seating ofthe simultaneously .by the pivotally supported yoke or connector' Y :member 10.1.5.. Duetothe fact that the valve ne movable valve heads 82 and 84, itwill'be under'stood that such seating is insured by reason, of the fact .that lthe valve heads are ca- #fico pable of verticalmovement Vwith..resp'ectfto each othert'o a substantial extent, inasmuch as "they are operatively'connected together headsare thus self-adj listing, vwide variations pitch of the screw-threads 94and 95 is such 1 asto insure the Vshaft 91 against self-reversal or tolerances, with respect to dimensionama'y be permitted vin the manufacture of the valve assembly, particularly in so far as such ele-;

ments thereof as the valveheads, the'valve seats and the yoke orconnector memberare-` "concerned, with the result that the cost of production, with regard tothe valve mecha- `nism 72, may be'keptjatfa minimum inthe manufacture of extinguishers embodying this invention. Suitably ber17, is a pressure pipe 104', which extends Vupwardly and is connected to thescrew plug 80 ein alignment withthe central passage thereof. This pressure pipe serves as is'obv viouswlien the valve head 82 is lifted lfrom its seat, to establish vcommunication between the pressure chamber 17 and the liquid chamber 16by way of an air-port 105V formed in `the wallof the housing'76 and communicating withthe valve chamber 77, to which the pressure pipe is connected.

Connected to the screwplug813`is `a'. able pick-up tube 1 06 which extends down` f `wardly in the liquid chamber substantially to the'bottom thereof, the pick-up tube being provided at its lower end with a suitable strainer 107.

This pickup pipeis adapted to communicatewith the valve chamber 78 when -the valve head 84:v islifted from its seat, from which chamberleads a discharge pipe 108, partially encircling` the upper end of the pressuregchamber 1.7 and suitably connected, in turn, to the outlet pipe 73.

From the Vforegoing description, it will'be understood that the extinguisher maybe operated, assuming the liquid chamber 16 contains a lsuitable fireextinguisliing liquid and the pressure chamber 17 contains a `quantity ofA gas or air under a.r substantial pressure, by so rotating the operating shaft 91 as to lift the valve headsf82and 84 from ltheir respective seats. Upon unseating the va-lveheads' 82 and 84, communication ise'stablished between theY pressure chamber 17 and the liquid i chamber 16, thus permittingtheescape of pressure from the former intothe latter by. way vof the pressureitube 104, valve chamber 7 7 andl vair-port 105. At the time the pressure chamber isopened tothe liquid chamber, `.the latter is opened to the atmosphere by way of the pick-up tube 106', `thevalve chamber V7 8, the discharge pipe-108. and the `outlet pipe 73 to which a suitable nozzle hose,

Inot showmmay be connected. As pressure supplied-to the liquid chamber from the pressure ychamber, liquid is forced outof=tlie former by way of the pick-up Vtube 106', valve cliainber78, discharge tube 108, outlet pipe 73 and the nozzle tubeprevi-ouslymen-v tioned In ordervtoclpse the valve heads 82 and 84'the hand wheel 9.1 is rotated :iii-the proper. direction to force such headsdownwardly vinto intimate' engagement with .their .respectiveseats. V

connected to vthe discharge chain- Referring to Fig. 10,the valve assembly 7 2 'shown therein is identical with the valve assembly 7 2 ofFig. 2,in so far as the elements of these two assemblies,v that are identiliedby similar reference characteristics are concerned. The valve assembly of Fig. l0 dif-V fers, however, from that of Fig. 2in that the valve head 82 is provided atits lower end 10 which is adapted to engage a ball valve` lll,

whereby 'suchvalve may be urged into firm seating engagement with the valve seat of the screw plug 80 when the shaft: '91y isso rortated as to .move the valve heads 82 and 84 downwardly. Concerning the ballvalvelll, it will be understood that as the valve head 82 islifted, communication between the pressure chamber l17 and the liquid chamber 16 is established by reasonof thefact that the ball valve is lifted from its seat underthe influence of pressure within-the pressure Achamber 17( .From the foregoing description of the valve assembly shown in Fig. 10,' it willbeunderstood that-it may be readily .employed in lieu of the valve assembly of Fig. 2, and that it `possesses the several advantages hereinbefore enumerated with respect tothat valve assembly. l i f Y It will be understood that various changes may be made in general and in detail withl regard to the disclosurehereof Without 'depart-ing fromv the spirit of the invention or the scope 'of the following claims.

' What is claimed is: w

l. In a fire extinguisher of the type including pressure and liquidV chambers Vfrom the former of whichjpressure is Vdirected into the latter tov expel the liquid therefrom,a valve mechanism for controlling the flow of liquid chamber and for controlling the flow of liquid from the liquid ychamber andcomprising a housing having a pair of the valve chambers, valve-head actuating means comprising a rotatable shaft having a screwthreaded portion, a screw-threaded element carried by said screw-threaded portionand 'adaptedftoi Ymove longitudinally of said chambersupon-rotation of said shaft `and carrying a" pair of Varms spaced from each other, a pair of reciprocatory valve heads disposed within said chambers and having their corresponding ends disposed "intermediate said a-rmswhereby said screw-threaded element is retained against rotation at such element disposed Vintermediate said" armsand pivot'ally connected to the same and connected to said corresponding ends of said valve heads for relative movement with res thef same.

former of which pressureis'directed into the i latter to expel liquid therefrom, a valve pressure from the pressure chamber tothe mechanism for controlling'the flow of Apressure from the pressure chamber to the liquid chamber and for controlling theA flow Vof liquid from the liquid chamber and comprising a housing having apair of the valve '70 chambers, valve-head actuatingmeans comprising a rotatableshaft having screw-thread s connection with saidhousingfa-nd adapted to with a cup-'like recess 110, the bottom wall of move longitudinally thereoil upon being rof tated, 'a valve-head operating member car- 75 ried by said shaft `forrelative rotation with respectfto Vsuch shaft and having a pair of arms spaced froineach other, a'npair of revciprocatory 'valve heads disposed within s aid` "chambers and "having their` corresponding '80 ends disposed intermediate said arms whereby Vsaid valve-head operatingA member is retained4 against rotation at'such time as said correspondingen'fds of'said valveheads yforV Arelative movement'wji'th respect totlie same.

-B In a' fireextinguisherofthe type inq cliiding pressureV and `liquid @chambers from "90 "the'formerof which'pressure is directed into the latter toexpeltheliquidtherefroin,Na 5

jvalvefmechanismfor controlling the flow of pressurefroml the pressure chamber-to the liquid?` chamber fand for fcontrollingA the -flow 195; of liquid` from the liquid chamber and comprising ahousing having-a pair of the valve chambers, valve-head actuating means coniprising a rotatable shaft-having a pair cfg;A seretti-threadedA portions,-` the screw-threads of one portion2 being ofan oppositeleadlto V'those ofthe otherportionynieans for-conneetin'g saidshaft to said 'hoi'isingl through said one ofsaid screw-threaded"portionsh,

whereby saidshaft is caused to moveflongi-i1`05 `-tudinally upon being rotated, a'V valve-head operating member carriedby the other of s aidscrew-threaded portions andadaptedlto move in a direction corresponding tothe `di-UA rection of longitudinal movement ofysaid 'H9 i shaft and haviiiga pair of arms Vspaced from each other, a'pair of reciprocatory 'valve headsdisposed, within said chambersv-and having Vtheir corresponding ends disposed intermediate said arms whereby :said valve- "i head operating member ris retained against rotation at such timelas said shaft is rotated, and aconnectorelement pivotally connected to' said valve-head operating member andUA 'connectedlto said correspond-ingends of said"120 time as said Vshaft is rotated, anda connector valve heads for relative vmovement with-vrespect to the saine'. Y v

.4. In a fire eXti-nguisher of-the type invcluding pressure and liquid chambers from;n l

the former of which pressure is directed into" s I A @il .the latter to expel'liquidtherefrom, a valve 2. In a fire extinguisher of thetype includingpressure and liquid chambers from the Aliquid from the liquid chamber and com- 130 Aprisin'g a housing having a ypair 1`of' valve chambers, valvehead actuating means com- ;prising 'a rotatable shaft yhaving a screwthreaded portion, a removable closure for 15 said housing, including a screw-threaded -member Aconnecting the screw-threaded por- `.tiontof'said shaft to said housing whereby said'shaft is moved longitudinally of-itself upon; being rotated, a valve-head operating "lm `member carried by said shaft for relative ro? theiformer of which pressureA is directed into c the latter tofexpelliquid therefromfa valve' "mechanismf-fo'r-v controlling the. fio-w of pres- "sureffromthejpressure chamber to the `liquid -chamber and'wforicontrolling the vow of #o liquid fromthe liquid chamber and lcomprisinga housing having a pair ofv valvev chaxnkdoers, valve-head actuating-means comprising f a .rotatable 2 shaft f hav-ing i a screw-threaded portionfa removable closurev for-said housing,

2535 including a r screw-threaded member connectring the screwthreadedfpcrtion 'ofl said shaft to; saidf` housing whereby said shaft is moved `'longitudinallyof itself-upon-b'eing rotated, a\va-lvehea'd: operating member carried-by f-lo 'said f shaft for relative rotation with *respect "to -such shaft; apair of 'reciprocatory valve frheads disposed'within said chambers," means ffor retaining `Vlsaid valve-head operating Y member' against rotation -atsuch time as said f5 "shaft-is rotated-,fa-connectorelement p-ivotally connected tosaid valve-head operating ymem- :ber-fand connected tosaid valve headsrforV lrelativei movement with* respect tothe same, 1 saidvalveheads, *sa-id valvehead` operating 50 4memberfand'saidshaft being removable as al unit from 'saidhou'sing upon removal of sa-id:v closure,` packingmaterial carried 4with- `irl-said.housingand disposed about said valve heads,V and glandnuts screwed into said hous- 955 `V`ing 'over said packing material` and accessible fthroughr'said housing yupon removal of said closure. f s 6.4 Aiire extinguishercompris'ing an upper -hea'da lower head having a lagscrew open- Y f intermediate said heads and from theformer fofV which pressure is ndirected into the rlatter to expel lqlld therefrom, 21 Valve mechanism foricontl'oumg the 'OW ofpressure from" the "65 pressure chamber tothe liquid chamber and ing, Vpressure and liquid chambers disposed for controllinggthe -flow `of"liquidfro'fmy the liquid-chamber, a pump disposeidrwi'thin and 4extending longitudinally of said chambers and including a 'pumpcylinder connected` at -one end to'said upperhead, a'pump check- 70 valve assembly 'connected' to v the other end of V.said pumpcylinder and including a housing connected to awall ofsaid pressure chamber and projectingthrough-the same into saidliquid chamber and having a passage @'15 through which communication may be established between said pumpand said; pressure 1 chamber, a check-valve inserta-ble into andfremovable Afrom r`said passage of V-said .housing by way of said lag screw opening S0 iand a removable lag screw lprojecting throughsaid lagscrew opening-.into 'said ,housing and'serving to-.tie said headsftogether through the medium of said pump cylinder'and ysaid housing. i I Y.

7. A fire extinguisher comprisingan upper head, a lower head having'fa lag screw opening,'pressure and liquid chambersdisposed Yintermediate said heads` 'from the former lof which pressure is directed into the 'latter'to 30 expel liquid therefrom, a-vvalve mechanism l for controlling the flow of pressurefromthe pressure chamber tothe liquid chamber and for controlling the; flow of liquidY Vfrommthe liquid chamber, a' pump-disposed within/and 095 extending longitudinallyv of saidk chambers `and including .a pumpcylinder connectedat one end to said upper head, a pump-check valve assembly connectedr to the other en'd of ysaid pump`- cylinder and includinga housing "300 connected to a wall of said pressure chamber and'. projecting throughs'aid wall into said liquid chamber'and' having a-passage through which communication may be'establishedbetween said pump andsaid pressure chamber,5105

check -valve insertable into and removable from said passage of said housing by wayof said lag screw openingmeans for anchoring said housingfto-said wall of' said ,pressure chamber, `including a shoulder, provided f -on 35110 said housing-and a nut carried by said housf' ing ybetween which and saidV -shoulder said y'wall is clampeda'removable lagscrew pro- 1j ecting'through lsaid lagzscrew opening into said housing and serving to tiesaid heads 15 together through the vmedium'of said pump cylinder'and f said housing and removable `packing means-l carried withinl said housing intermediate said check-valve 1 and saidlag 58.3 In a fire extinguisher of the typeincluding; pressure and* liquid chambers from: :the 'former of which pressureis directed-into thelatter to expelliquid therefrom, a valve mechanism for controlling the' flow of pres-@Q25 sure from the pressure chamber tothe-liquid chamber and for controlling the,` How yofliq- Vuidv fromithe liquid ychamber, and comprising a housing having'a pair of valvechambers, a

removable closure for saidy housing, valve-52;:

head actuating means projecting through .said closure and comprising a rotatable shaft having a screw-threaded portion, a screwthreaded element carried by said screW- threaded portion and adapted to move lon gitudinally of said chambers upon rotation of said shaft, means for retaining said screwthreaded element against rotation at such time as said shaft is rotated, a pair of reciprocatory valve heads disposed Within said chambers, and a connecter element pivotally connected to said screw-threaded element and connected to corresponding ends of said valve heads for relative movement With respect to the same, said valve heads, said screvvthreaded element and said shaft being removable as a unit fromsaid housing upon removal of said closure. Y

In testimony whereof, I have signed this specification.

FRED ALBERT DODELIN.

Images