US2520591A - Control cock for gaseous fuel burners burning a mixture of two gases - Google Patents

Description

Aug. 29, 1950 H. T. WILMARTH CONTROL cocx FOR GASEOUS FUEL BURNERS BURNING A MIXTURE 0F 'rwo GASES 2 Shee ts-Sheet 1 Filed April 9, 1946 Aug. 29, 1950 H. T. WILMARTH 2,520,591

CONTROL cocK FOR GASEOUS FUEL BURNERS BURNING A MIXTURE OF TWO GASES 2 Sheets-Sheet 2 Filed April 9. 1946 INVENTOR Wiazae'z n!!! mm Patented Aug. 29, 1950 OFFICE CONTROL COCK FOR GASEOUS FUEL BURNERS BURNING A MIXTURE TWO GASES Harry T; Wilmarth, Attleboro, Mass.v

3 Application April 9,1946, Serial No. 660,732

' 6 Claims. 1

My invention 'relatesto improvements in safety cocks or devices for gaseous fuel'burners, particularly those of the type adapted to mix two gases in the burner prior to their ignition, one of which' is inflammable and the other is not, but may be a supporter of combination, although many features of my device may be employed in use with a burner burning a single gas only.

A main object of my invention is to provide a control unit whichis operated by the actual burner itself thereby providing asubstantially fool-proof "device including a combination valve handle and hanger for the burner which will operate when the'burner is hung when not in use to automatically shut off the gas supply or lower it to a small pilot flame only. Y

An object of my invention, therefore, is to provide a safety device' against fire. Many fires have been caused in-soldering and brazing plants where the gas burners have often'been left burning full speed between jobs or have hung on the hooks provided therefor with a full flame, thereby increasing the flre hazard. Employing my invention, however, the flame is positively 'cut' down to a small safe pilot flame when the burner is properly put away between the periods of its use. I g

A further object of my invention is to save the amount of gas employed'fas the device is automaticallyshut oil when the burner is placed in I position on itsholder and turned on automatically when the burner is'lifted from its-holder for use, and thus thereis no loss in gas in burn; ing it when it is not needed. 'i A furtherobject of my invention is toprovide .a device which is always properly adjusted when ready for use, as placing the burner on its holder automatically either turns the burner off or reduces the flame to pilot size sothat the correct proportion or mixture of gases is always present to'give the proper flame'when the burner. is removed from its hlder., In prior devices it has been necessary to separately shut off both gases and readjust the respective proportions A further feature or my invention relates to the use thereof inburners which burn two gases mixed in the burner; one of said gases being: inflammablelike' fuel gas, natural gas, acetylene,-

Philgas, etc., and the other being a non-inflammable supporter of combustion like compressed air, oxygen, etc. In order that the pilot flame may be continuously maintained, it is highly de-' sirable that the inflammable gas reach the burner prior to the time that the non inflammable gas reaches it in sufficiently large amounts 'to blow out the pilot flame, and my invention specifi-- cally' relates to a structure wherein the flow of Further features of my invention relate to improvements in structure of the component parts thereof, including the 'means I preferably-employ to mount my device on a work table or other" support; 1

' These andsuchother objects of my invention as may hereinafterappear will be best understood from a description of an embodiment there of such as is shown in the accompanying drawings. In the drawings, Fig. 1 is a diagrammatic perspective view showing myinvention in use with a blow pipe burner of standard type for burning a mixture of twogases, one of which is inflammable having flexible pipes connecting said gases to the burner with my improved control cock interposed in said flexible pipes and with portions thereof broken away and shown in section to illustrate the structure thereof with the burner lifted away from its hanger hook to permit the control device to automatically move to a burning position in use.

Fig. '2 is a-diagrammatic perspective view of the same parts shown in Fig. 1 with the burner hung on the hanger handle to move my control device to a shutoff position permitting a slight leakage of inflammable gas therethroughto provide a pilot flame, with portions of my improved device also being partially broken away and shown in section. 1

Fig. 3 is a perspective view of my control device. r

. Fig.4 is a horizontal sectional view therethroughtaken along the line 4-4 of Fig. 3.

Fig.5 is a vertical sectional view therethrough taken along the line 55'of Fig. 4.

6 is a perspective 'view of my improved rotary cylindrical plug or valve.

Fig. 7 is a sectional View therethrough taken along the line 11 of Fig. 6.

In the drawings, wherein like characters of referenceggenenally indicate like partssthrougheout, it? generally indicates a controlLeockconstructed in accordance with my invention, provided with a suitable. type of means for permitting. a flow of suflicient gas. therethltongh .to provide a pilot light for the burner.

adapted for use for gaseous fuel burners l 2 burning a mixture of two gases, one ofi-which: is ina flammable having the flexible pipes, IA. andlhrespectively connecting the respective sources of supply of said gases to the burner 12, in the-em.

1 bodiment shown, the inflammable gas being connectedtothe-burnen l-kthreushithapi a t8, and theanoninflammable gasibeing; connectedto the ulinerrthrough 17118193128: Ht. In-vthe;eanbed-i-rnent,

. shewnlgl haveshown a. standaadntypeiof. blowpipebui'ner; oi-a tipercemmenly usedinrsoldering smalh anticleshsuehz asiewelry articles, which urnen- J2: m y commisethe parallel-pipes laand-.219; Gmflneotable-respectively to! the: pipes. Mt

and t6dmthernonrinflammable andiinflammahle.

nespectiyely, joinedttogehher; by. the amtmising; pipe Zip-mitigating. obliquely dQWJIIr; wardly at, the; outeh end thereof with the nor:-

inflammahle gas discharging into; the; uppertendi 26, thereof thneugh; the: pipes at the infla;nmable gas-.discharginssheraway dcymzthe length, thereofi through; a. hole: 28: therein; onpositm thei -end of the pipe 29 for the inflammable gas. and:

with: the: lowen'endi 3 theneotrproyiding. a bur-ningtipifonthegasesmixedimthemixing-ehamber 32,-ffomred; betweeni thmhcle Zltamh tipj 30.

Jim embodiment. shown. the. inflammable gas comprises any suitable type of niekgasssuchz asscoal; gasi. watergas; natunal: gas; acetylene, 'lihiigaspetrz. connected thmu ghithei pipe; 3 h toiazpoiniaadtiacenti thezwork; bench as and ham a: pet; cock .38: thereiniwitin a, stub; 46: for: com

As; stated hitherto, my improved control'cock is preferably necting the end of the flexible pipe I5 thereto.

A2 similar-i pipe 42-: is; connected. to; the source. of compnessed: air, oxygen on cthen-suppoizter of;

L combustion or' other gas used; and: hasiatsimilar:

pet; coclekii thereim. also. having: a stubz as there in for connecting the end of the flexible pipe M thereto Employingmy iniprhyedi-invention, the

my: invention may be interposed.v therein;

'Broadhr, my invention; includes: a valve casing- 43-: hayinga cylindricaiw bore-- 58; sets of spaced pipes 'z and E k-and: 5fisand 58; projecting forwardlyv and rearwardly from: saidcasing adapted tobe interposed in said flexible pipes l i; and Mia I also provide means 60 to mount said" cook it horizontally or vertically on at* any; de-- sired angle on theworh bench 36= I-"provi'de a cylindrical plug 62 rotatably contained within the 'cylindri'ca-L bore of the" valve casing 48 having agasi'nlet hole' 64 therethrough 'in line when-in open position-withonesetof alignedigaspipesfiz and .58 for the respectivesections of. the line M for: the non-inflammable gas, and an inlet hole 65' extending. therethrough inline with the other set of" gas pipes- 54 and 5.8 interposed in.the respective sections of the line It for the inflammable gas. I proyide suitable. means 6.0. to mount, th control cockat any desiteiangle. onthe. work,

pipes I; and L6. are=split into-sections so that i 4 bench 36 or other support preferably in the horizontal position shown, although it may be mounted vertically or at any desired angle. I also provide suitable means 10 to secure said rotary plug within said casing against axial movement.

A main novel feature of my invention is that I: provide a.preierably radialthandiee t2 for turning' s'a'idiphzg. E2 one directiongnamelyg to an open or closed position, which handle 12 in the embodiment shown also provides suitable means 13, for. hanging theburner l2 thereon as shown ingEi'g, 2. Tnehanging of the burner 52 on the handle TZ'urges. the inlet holes 64 and 66 out of alignment with their respective sets of pipes and" 5b andi 54 and 58, although it is obvious that. insofar ascertain aspects of my invention are concerned that the handle 12 may be operated hand or by any other suitable type of mechanism, weight, or otherwise.

A. turthen novel; fieatureof; may invention-resides in,.the; fact that I pmsvtidev preferablg in: com: binatieniwitlt the, handle in which. man beated as. stated byy the weight oi the hurries h2 to. shut. ofi my impnoyedcontmh caela, of: meansto automatically retmini the rotor. or rotary cylinr dricali 62: of, my invention; to? am open post-1 adapt d: ar use. intsuap tzing-tww sp s oi gases:

to a mixing burner and ion thisiputnaseithe walyez, eas n pr vided; withithe' pipe 54'; projecting forwardly; thenefromi and the: nine; 5%8rproiectins: e we a e r mr riseienabln; diametrically;

1 spesiteg. the p pe; and. theseylindnicalplug ea 15, pmyidedwith the: inlet helenlifiadaptedz to be. brought in. androut oii alignment the: said-5 inflammable: fluid supply pipes; 514 and; 5'8.--. con-.-' nected to ends ofthe; flexible seetiensof theflh he; L6 which i broken: ton this... purpose to supply the inflammable gas;,-te:thabunner 132., Inasimi-a lar manner, the casing 48 is provided with the pipe, 5.& pnoiectmgionwa zdly thenefrom -and the pipe. 56.: proiesting: 'rear'wandlg thelzefrom preiea ably diametrically thereof; and: the. cylindrical,- plug. 52.: iapnovidedl with. the; preterably diametria, inlethole: 64 to proyid gamonduit through. my, control. device. lit for: the. more inflammable, gas; adapted to be connectedtathaendsiof the.v flexible. sections, of. the. L4. tor thisI purpose. In most, instances it; is, desired. tomaintain, a. reduced. pilot, flame, fi'wheni the. cylindrical plug 62 is. rotated. to. a closed;v position by, depression of the handle 12 due, to hanging. thabunner ll'Zf thereon as shown in Fig, 2' andjf'or this. purpose. itisnecessaryto by-pass, on blieedia smallamoilnt: 0i inflammable gasthrough my: improved, device; when in closedposition. I'have shown in .the drawingstwo particular types oijmean fbr m viding sufficient. gas for, thepilhii-fiame. T1- 4;, shown more particularly in Figsl, 5 and 7; said" y-nass.may omprise the biz-s ss. n l tisr ve, T4 extending .rearwardly' a distance along the? periphery thereof; at the upper endfoff saidf inlet: hole. 66 a d aby-na s pi o ne mherall r ove' '5; extending forwardly thereiizqm atrthe l'owerend; Qifsaidlhole 66 so .thatwhen' said, plug it no tat'edto a closedposition enough gas williescapei through the'hollow pipe 58through1 thegrooye; l4. to-pass throughthehole .66.. in the plu the groove 16 and out through the pipe 54 to pro-i gas to maintain the turning movement of the plug 62 from a closed to an open position, the plug being in the open position as shown in Fig. 1 when the handle I2 is raised towards a vertical position and the plug 62 being in closed position as shown in Fig. 2 when the handle I2 is moved within the slot 80 away from a vertical position. It is obvious that the adjustment of the adjusting screw 18 may limit the length of the segmental opening 80 for said handle 12 so that the amount that the hole 66 comes out of alignment with the pipe ends 58 and 54 may be adjustably limited to vary the amount of inflammable gas passed throughtheflexible pipe I6 to the burner.

1 As stated hitherto, it is necessary to keep thefurther relates to thespecific meansIpreferably:

employ to increase the speed of the'inflammable gas. For this purpose, I construct theinlet hole 66 'ofa-so-called Venturi shape, namely, with the conical portion 82 converging towards the cylinder axis and the conical portion 84 diverging awayfrom the cylinder axis, although, if desired,

the point or throat of the smallest diameter need i not pass through thecylinder axis.. Inorder'to increase the flow of inflammable gas therethrough, the outer ends of the converging and, diverging cones 62and 8,4 are of larger diameters than ,the diameters of the pipes .54 and58, sotha as y pproach the pipes 54 and- 58 they.

will receive gas therefrom sooner than the non inflammable gas is passed throughthe smaller true cylindrical hole 64. is a main feature of my invention, namely,- that. the holes in the.

ends of the'plug hole 66 are larger than their pipe holes, so that the inflammable gas will flow faster therethrough than the non-inflammable gas: will flow through the hole 64 which has pipe holes of the same size as said hole 64, Inasmuch as both gases are under pressure, this insures that the pipe 20 and mixing chamber 32 will be filled 'with inflammable gas before the noninflammable gas has a chance to reach the chamber 32 through the pipes I4 and 52, inlet hole 64-,'pipes 56 and I 4, burner pipe IBand oblique pipe 24. v

--In the embodiment shown, the various parts heretofore referred to are specifically constructed as follows:

As means 60 for mounting my improved control device or cook on the work bench 36 or other support, I provide'the valve casing '48, with the internally threaded tubular socket 86- projecting downwardly therefrom and I provide the supporting rod 60 having the screw threaded lower end 88 adjustably insertable in the top of the work bench 36 vertically as shown or at any desired angle if desired and a threaded upper end 90 threadedly contained within said threadedsocket86 to mount said valve casing 48 as shown horizontally across said flexible pipes or with the cutoff ends thereof inserted on the respective casing pipes 52, 54, 56 and 58.

I provide the casing 48 with the closed innerend '92 and I preferably construct the means 10 to retain the plug 62 against axial movement within the casing bore 60 as follows: I provide the circumferential retaining groove 93 in said plug immediately above the end of the hollow socket 86 and I provide the retaining screw 94 having a head 96' externally threaded as at 98- threadedly inserted in said socket 86 above the upper end 90 of the rod 60 having an aligning axial movement within said valve casing 48.

To provide means to limit the movement of the turning handle I2, as stated, I provide a cut' away segment in the outer edge of the valve casing '48 extending the minimum desired turning distance downwardly and forwardly from the top thereof as explained and I provide the fin I02 projecting forwardly from said casing having a screw'hole I04 projecting obliquely rearwardly from the bottom of said fin I02 within said segmental cut away portion 80' and the adjusting screw 18 has a shank projecting through said hole I04 within said segmental portion and a head I06 adjustable from underneath said fin I02 to adjustably vary the length thereof to varythe amount of pilot gas by-passed through said inflammable gas line I6 as previously explained;

As stated hitherto, I believe I am the first to provide means of the type about to be described to automatically move the rotary plug 64 of the valv e'to'an open or closed position, in the embodiment shown specifically for moving the plug to an open position although it is obvious that if it be desired to automatically move the plug to a 'closed position that the improved structureabout to be described may be attached to the control device for this purpose. For this purpose,

therefore, in the embodiment shown I provide a turning'socket I08 projecting downwardly from adjacent the front of the inner end of the valvecasing 48 so that the open end H0 thereof discharges upwardly into the hollow interior of the valve casing inside of the front wall of said valve" casing 48 in front of the axis of its cylindrical portion. The inner end of the plug 62 is provided with a partially cylindrical cut away portion H2 to provide a partially cylindrical open chamber H4 having a flat upper wall H6 pivotable in'the upper portion of said casing. A turning pin H8 projects from the upper end of said turning socket H0 and abuts the front edge of the wall H6 of the cut away portion on the inner end of the plug? A detachable plug or set screw I20 is provided for the lower end of said turning socket and a coil spring I22 or other spring means is interposedbetween the lower end of the turning pin H8 and plug I20 to urge said turning pin IIB upwardly against the outer edge of said wall H6 to rotate said valve plug 62 to an open position bringing said inlet holes 64 and 66 into alignment with their respective pipes.

I believe I am the first, however, to provide a spring actuated turning pin functioning against a flat surface of a segmental cut away portion of a rotary cylindrical valve 62 to turn it in either direction, either from a closed to an open position. as shown, or from an open to a closed position. I I

The inner end of the mounting wire 12 is. in-

ing a gas inlet hole extending therethroug-h in line when in open position with one set of gas pipes for the non inflammable gas and a gas inlet hole extending therethrough in line with the other set of gas pipes for the non inflammable gas and a circumferential retaining groove therein opposite said mounting socket, a retaining screw having a head threadedly insertable in said socket and an aligning lug projecting vertically within said circumferential groove in said valve plug to retain it in position against axial movement within said valve casing, a supporting rod having a wood screw threaded lower end adjustably insertable within a work bench and a threaded upper end screwed in said socket below said retaining screw to mount said valve casing horizontally across said flexible pipes with the cut off ends thereof inserted within their respective casing pipes, a hanger handle mounted on said plug for mounting the burner therein movable when the burner is hung thereon to urge the inlet holes out of alignment with said pipes and means to automatically return the plug to move said inlet holes to an open position operable on removal of said burner from said hanger.

4. A control cock for a gaseous fuel burner having a flexible pipe adapted to supply gas to the burner, comprising a valve casing having a cylindrical bore, pipes for said gas projecting forwardly and rearwardly from said casing adapted to be interposed in said flexible pipe and a turning socket projecting downwardly from adjacent the front edge of the inner end of said casing so that the open end thereof discharges upwardly into the hollow interior of said casing inside of the front wall thereof and in front of the axis thereof, a cylindrical plug rotatably contained within said cylindrical valve casing having a gas inlet hole extending therethrough in line when in open position with said gas pipes and a partially cylindrical cut away portion at the inner end thereof providing a partially cylindrical chamber having a flat upper wall pivotable in the upper portion of said casing, a turning pin projecting from the upper end of said turning socket and abutting the front edge of the wall of the cut away portion in the inner end of said plug, a detachable plug for the lower end of said turning socket and a coil spring interposed between the lower end of said turning pin and plug to urge said turning pin upwardly against said wall to rotate said Valve plug to move said inlet valve to an open position, means to secure said rotary plug within said valve casing against axial movement and a hanger mounted on said rotary plug for mounting a burner thereon movable when the burner is mounted thereon to urge the inlet plug hole out of alignment with said pipes.

5. A control cock for a gaseous fuel burner having a flexible pipe adapted to supply gas to the burner comprising a valve casing having a cylindrical bore, pipes for said gas projecting forwardly and rearwardly from said casing adapted to be interposed in said flexible pipes, having a cut away segment in the outer edge thereof extending downwardly and forwardly a maximum turning distance from the top thereof, a cylindrical plug rotatably contained within said cylindrical valve casing having a gas inlet hole extending therethrough in line when in open position with said gas pipes and an outer end having a radial hole therein within the cut away portion of the valve casing extending substantially vertically when said valve plug is moved to an open position and pivotable to'a forward position in the lower edge of said segmental cut away portion, means to secure said rotary plug within said casing against axial movement and a mounting wire projecting outwardly and forwardly from the radial hole in the outer end of said plug having a loop in the outer end thereof for hanging the burner thereon whereby the weight of the burner may move said plug to urge the inlet plug hole out of alignment with said pipes and means to automatically return the plug to move said inlet holes to an open position operable on removal of said burner from said hanger.

6. A control cock for a gaseous fuel burner having a flexible pipe adapted to supply gas to the burner comprising a valve casing having a cylindrical bore, pipes for the gas projecting forwardly and rearwardly from said casing adapted to be interposed in said flexible pipe and an internally thr aded tubular mounting socket projecting downwardly, a cylindrical plug rotatably contained within said cylindrical valve casing having a fluid inlet hole extending therethrough in line when in open position with said gas pipes and a circumferential retaining groove therein opposite said mounting socket, a retaining screw having a head threadedly insertable in said socket and an aligning lug projecting vertically within said circumferential groove in said valve plug to retain it in position against said axial movement within said valve casing, a supporting rod having a wood screw threaded lower end adjustably insertable within a work bench and a threaded upper end screwed in said socket below said retaining screw to mount said valve casing horizontally across said flexible pipe with the cut off ends thereof inserted within their respective casing pipes, a handle mounted on said plug for mounting the burner therein movable when the burner is hung thereon tourge the inlet hole out of alignment with said pipes and means to automatically return the plug to move said inlet hole to an open position operable on removal of said burner from said hanger.

HARRY T. WILMARTH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 329,461 Cowen June 23, 1885 395,453 Powers Jan. 1, 1889 574,237 Brown et a1. Dec. 29, 1896 757,482 McCahill Apr. 19, 1904 1,097,264 Reich May 19, 1914 1,222,164 Von Todenwrath Apr. 10, 1917 1,335,922 Saulze Apr. 6, 1920 1,948,737 Stettner Feb. 27, 1934 2,108,299 Steffen Feb. 15, 1938

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