� �7� "H, F, ALFERY _ @$14,220 TEMPERATUR� CONTROL Aun SAFETY sHUToFF Filed may 13. 1943 � .n ?. L 47 \^\\ `\.\` | � 1? s sheetefsn?eet 1 3am. 14, 194K 2,414,220 H. F. ALFERY TEMPERATURE CONTROL ANDYS繤ETY SHUTOFF Filed )lay 13, 1943 3 Sheets-Sheet 2 Jan. 14, 1%'32 ' 2,41432@ H. F. ALFz-:RY TBHPER繲URE CONTROL AND' SAFETY SHUTOE?F Filed iiay 13, 1943 5 Sheets-Skaai; 3 l @aient dat l@ l? '_ ,non ravenv 2,414,220 ' TEMPERATURE CONTROL AND SAFETY SHUTOFF ' Henry 1F. liliery, Milwaukee, Wls.','asslgnor to Mil Wannee l玹ias Specialty Company, Milwaukee, Wis., a orporationof Wisconsin ? application May is, 1943, serial No; 486,844 i reclaim. il This invention relates to control systems for heating a body of :duid and maintaining it at a . desired temperature, within predetermined lim its, and has to do with such a system embodying (Cl. 236-21) . . '. control means embodying my -invention applied thereto; ` _ " Figure 2_ is a. plan view of the control means shown in Figure 1; l temperature control and safety shuto� means. 5 Figure 3 is a sectional view taken substan My invention is directed to a system of the tially on line 3_3 of Figure 2, certain parts be character stated having 'a main burner and ther ing shown in elevation and certain part-s being ~ mostatic vmeans for automatically controlling iiow broken away; of fuel to the burner in accordance with the tem Figure 4 is a front view of the control means perature of the iluid heated thereby, there also of Figure 2; . ? -` being means for materially reducing or complete Figure 5 is a sectional view taken substantially ly shutting off 韎ovv of fuel to the main burner. on line 5--5 of Figure 2, certain parts being in case the temperature of the fluid being heated shown in elevation; f thereby exceeds a predetermined desiredl mari--4 Figure 6 is a fragmentary sectionaI view of mum. More specifically, I provide a conduit l5 the outlet chamber portion of the valve body, _ structure for supplying fuel to the main burner, showing a modified form of my invention; and Figure 7 is a diagrammatic view of the elec outlet chamber, supply of fuel to the inlet cham tromagnet and the armature for holding the ber being controlled by conditions' at the main main control valve in open position, this v韊vv burner for shutting ou the supply oi fuel there 20 showing also-the manually operable switch means to in the event of extinguishment of a pilot burn for releasing the amature from the frame of the electromagnet, and the associated circuits. er associated'with the main burner, or of the this structure having an inlet chamber and an main burner, means also being provided for con- ` I have illustrated the control means of my in vention as used in connection with a hot water trolling supply of fuel from 'the inlet chamber heater. by way of example. but it is to be under to the Imain burner responsive to variations in stood that the control means of my invention is temperature of the fluid heated by the main not limited to this particular use and may be burner, there being means i?or resetting a valve employed for all analogous purposes or for any controlling supply of fuel to the inlet chamber, other purpose to which it is suited. and there also being means supplementary to the .temperature responsive means lor disabling the 蛍 The control means of my invention comprises a suitably formed valve housing or body i@ pro recettinG means when the temperature ofthe vided at its upper end with an exteriorly threaded i'luid being heated exceeds a desired predeter nipple li which, in the use of my invention illus mined mammina, this latter means enabling the tratecl, is threaded through a boss l2 of a hot resetting means when the temperature of the .駏id to or below the desired maximum. The ineens. controlling admission ot fuel to the water tank it. Tank i3 is provided with an up wardly domed bottom Wall ifi beneath and ad jacent which is suitably mountedl a gas burner ib of known type, disposed within a chamber inlet chamber comprisesamain control valve yieldingly urged in closing direction and, in the defined by wall vI4 and the lower depending skirt normal operation of the control means, held in 4o portion it of tank i3. The burner ttl is provided open position by an electromagnet energized by with a conduit l1 ilared at its lower end portion an electric current generated by a tbermocouple to provide a mixing chamber it, at the lower end heated by a pilot burner associated with the of which is mounted an adjustable disc it pro main burner, or by the main burner itself, and vided with openings, forregulating the amount manually operable means is provided lor releas >of air entering mixing chamber it, as is well ing the main control valve from the electromag known. Disc i9, and the bottom wall of cham net and thus completely shutting ou" :low of fuel ber l@ are provided with openings centrally there to lthe main burner independently of the tem of for reception of a tip 2t suitably mounted on perature of the uuid heated by that burner, when Athe upturned end cfa fuel supply pipe 2l passing 50 through a suitable opening in skirt portion it Further objects and advantages of my inven of tank I3. ` , , tion will appear from the detail description. 'l'he other end of pipe 2| is screwed into a pro desired. In the drawings: - . ' . Figure l is a side view, of a hot water boiler , jection 22 extending from one side of valve body l0 at the upper portion thereof, which projection ' or tank, partly broken away and in section, with 55 is suitably bored and tapped for that purpose. 2,414,220 , > 3 , Projection 22 is provided with a passage 23 there in opening into a cylindrical outlet chamber 24 closed at its outer end by a 馻nged screw cap 25 threaded into thickened portion or boss 26 of back wall 21 of body I0, with an intervening gasket 28. The inner end wall of chamber 24 is provided with a valve port 29 opening there through into a neck 30 forming an integral in ' ward extension of chamber 24 and provided with mation in which is secured one end portion of a tube 41 in which is mounted, at said end, a flanged plug 48. A rod 49 extends slidably through plug 48 into the upper portion of inlet chamber 32 of the valve housing I0, the outer end portion of thisrod being screwed or other wise suitably secured in a flanged closure plug 58 secured in the outer end of tube 41 in any suitable mannerI to provide a 駏id-tight and a circumferentially extending slot 3l opening 10 pressure-resistant closure therefor, conveniently by a circumferential bead 5I pressed inwardly into inlet chamber 32 of valve body I0. The from tube 41 into a corresponding groove in plug inner end wall of chamber 24 is provided with ed. The tube 41 is formed of a suitable metal, a raised outwardly extending rib 33 providing and has a coefficient of expansion much greater a seat for a suitably faced valve 34 controlling than that of rod 49, the coefficient of expansion of port 29. Valve 34 is attached to the inner or which preferably is quite small. Tube 41 and rod forward end of a valve stem 35 for outward move 49 together constitute a thermostat immersed in ment therewith; by means of a U -shaped retainer the water within tank I3 heated by burner I5, 36 -of known type engaging in a corresponding circumferential groove in stem 35. The inner ' so that this thermostat issubjected to heat gen end of stem 35 abuts a reduced screw studI 31 20 erated by the burner. As the temperature to which the thermostat is subjected increases, tube of. an inner valve stem 38, secured to valve 34 coaxially with "stem 35 by means of stud 31. The - outer portion of valve stem 35 is slidable in a hollow boss 38' integral with and projecting in 41 expands and moves rod 49 outward and, upon a decrease in temperature, tube 41 contracts and moves rod 49 inward of the valve housing ill. ward from the inner- face of cap 25, this cap 25 The inner end of rod 49 is secured in a con necting block 52 disposed 籦etween two arms, yone being recessed from its inner face for reception of which is shown at 53,?of the upper slotted por of the outer end portion of a coil compression tion of a valve operating lever 54 to which block spring 40 seating therein and confined between 52 is loosely pivoted at .55. Lever 54 is pivoted, cap 25 and� valve 34, this spring yieldingly urg ing the valve toward 顃s'inner or closed posi ao intermediate its ends, at 56, on a mounting block 51 disposed between arms 53, this bloc'k 51 being tion. ' Valve stem 38 is slidable, at its inner end por tion, through a disc 4I seating against a shoulder threaded onto the inner end portion of an ad >justing screw 58 rotatably mounted through a. ? stufling box 59 of housing I0. Screw 58 is pro in the rabbeted'inner end portion of neck 39, this disc having an inwardly extending circum 35 vided, on its stem portion, with an enlargement 80 cooperating with the inner end of the stui?駈g ' ferential flange 42 on which seats the edge of a box structure and with a follower 6I and a nut spring steel snapidisc 43 of concavo convex cross 62 screwing into the outer end of the stuiling section, of known type. A plunger 44 is slid� ably mounted in the inner end of neck 30 and?is provided, at its outer face, with an annularl pro jectionor rib 45 of substantially V shape in cross sectio-n, which contacts snap disc 43 a short dis tance from the edge thereof. In _Figure 3 the snap disc 43 is shown in its inwardly bulged position, thus permitting closing of valve 34 by compression spring 40, which serves to hold this valve closed. Outward movement of plunger 44 exerts pressure upon snap disc 43 adjacent the box, for confining screw 58 against endwise move ment. At its outer end screw 58 is provided with an enlarged head 84, preferably knurled, car rying, at its inner end, and index member 65 provided with a point or index element mov able over a suitably graduated scale 88 on theY outer surface of valve housing I0. The lower end portion of lever 54 is of increased thickness and rounded as shown, at 85, and contacts the inner face of rfollower 44 centrally thereof. In "Figure 3 th'e lever 54 and associated parts are circumference thereof, by means of element 45, thus deforming disc 43 which, when deformed to 50' shown in the positions which they occupy when outlet v?alve 34 has been closed responsive to a certain extent, will snap to its other position a desired maximum temperature to which the so as to be bulged'outward, thedisc 43 in its thermostat is subjected. After closing of valve outward movement contacting the inner end of 34, the temperature of the thermostat decreases valve stem 38 and forcing the same outward, thus and rod 49 is forced inward of valve housing opening valve 34 in oppositionto compression i8, thus forcing the lower end >of lever 54 out spring 4U and holding'the valve 34 in its open ward, that is, toward outlet chamber 24, with position. In that connection, it is to be noted corresponding, outward movement of follower 44. that the pressure contact of element 45 with the When the temperature to which the thermostat 'snap disc 43, a short distance inward from the edge of the latter, in conjunction with the edge 60 is subjected has decreased to the desired mini mum, the outward movement of plunger 44 causes of disc 43 seating on rim 42 of the disc 4I, sup outward flexing of the snap disc 43, thus open plements the snap action of disc 43 so as to as -ingvalve 34 and maintaining it open until the sure opening of valve 34y and maintaining of this . desired maximum temperature has been again at valve open by disc 43,- in the manner'stated. tained, at whichl time lever 54 will have _been Upon inward movement of follower 44 to about returned to its position shown in Figure/3 and its position shown in Figure 3?element 45 no the valve 34 will be -closed by compression spring longer exerts effective pressure contact upon disc 40, in the manner previously described. By 43, with the result that this disc may now be means of the screw 58, the pivot 56 of lever 54 moved inwardly bythe pressure exerted by com pression spring 48 until it snaps over center into 70 can be adjusted inward and outward, within lim its, so that the thermoresponsive means for open its full line position shown'in Figure 3, outlet ing and closing the outlet valve 34 can be ad valve 34 being then closed by compression spring justed with facility for operation of this valve at any desired predetermined minimum and max Nipple Il is provided with a bore of step for 75 imum temperatures, within limits. 40 and held closed thereby until snap disc 43 is v again snapped outward. . 2,414,220 Valve housing lo is provided, at thelower end _d 13 is in its open position, as shown in Figure 3. of inlet chamber 32 thereof. with a partition 1li with an inlet valve port 1l extending there through, the under face oi partition 10 being re-5 cessed'concentrically with port 1I to provide a downwardhr extending valve seat element ?12 about port ll. An inlet valve 13 of suitable con? In order to reset the valve 'It to open. position, the reset stem 93 is moved inward of housing Ill into contact with arm te o� angle lever 8d'. thus swinging this lever, in the continued inward movement of reset stem 93, in a oounterclock wise direction, as viewed in Figure 3, and moving struction controls port 1l, this valve being urged - valve l� into its open position and the. armature in closing direction by a compression spring ?it 'it into its attracted position adjacent electro disposed about valve stem 15 and con駈ed be magnet le, the latter, if energized,.the=n serving tween valve it and the upper or inner end of to retain valve ?it in its reset or open position� an electromagnet housing 16 secured to the lower Arm t@ is disposed adjacent the lower enlarged end of valve housing iii by a flanged nut l1, or' portion to of lever bd, when valve 13 is in its open position and lever 5d is in the position in any other suitable manner. An armature 1o is attached to the lower end of valve stem 'ib and, 15 which it occupies when the thermostat, compris rin the open position of valve 13, is disposed in its ing the tube 縧'i and rod do, has been heated to attracted position in which it is held by an elec the desired maximum temperature, or, more cor tromagnet 'i9 within housing 16,' when the elec rect-ely, the body of 駏id surrounding and in tromagnet is energized. When valve 13 is in its contact with the thermostat has been heated� to closed position the armature 18 is in its released 20 the desired maximum temperature. That per- ' position spaced away from the electromagnet'w, mits resetting of the inlet> valve 13 to its open the latter being effective, when energized, for ~ position, in the manner above described. In the holding the armature 1d in attracted position in event the desired maximum temperature is ex opposition to compression spring ?M but inei?i?ec ceeded and the water or other huid is heated to tive for moving the armature 'lo from its released 25 an objectionably high temperature, lever b4 is position to its attracted position. Under nor turned in countercloclrwise direction about its mal operating conditions, the electromagnet ?lo is , pivot et, as viewed in Figure 3, into a position energized and inlet valve 13 is held. by the elec in which the lower enlarged portion t5 thereof tromagnet in its open position. A gas supply contacts arm ilo and swings lever te in clockwise pipe et, provided with a shutoi� cock 8l of known 30 direction, thus forcing armature lo away from type, leads from a suitable source of supply of electromagnet le and releasing the valve i3, gas, or other fuel oi suitable character, this pipe which is then closed by spring 1d. So long as the screwing at its upper end into a lateral projection objectionably high or excessive temperature per et extending from the opposite side of valve sists, lever ed remains inposition obstructing in housing lo from the projection 22, projection di ward movement oi arni ed oi lever tu, thus dis being disposed at the lower portion of valve hous abling the resetting means and preventing re ing it and opening into the latter below partition opening oi the inlet valve i3. That guards lo. 'Under normal conditions, the> gas cock- ul against supply of iuel to the burner :ib in the is open, and when valve lf3 is in its open position, event outlet valve dil should remain open, due gas flows into inlet chain-ber 32 from which it 40 to sticking or other causes, after the water or may flow through pipe 2i to the main burner other fluid has been heated to the desi-red max it, under control ci the outletyalve tt. . imum temperature. in such event, the lever> 5d inlet valve 'it is provided with a stem o5, co would function to assure closing of valve 1t. arial with and constituting in e馿ct a continua whiley also preventing opening thereof until the tion oi stem le, projecting therefrom upward through the inlet opening li. The upper end portion of stem iid is slotted at t6 for reception of the end portion of lower arm dfi of an angle or bell crank. lever titl pivoted at til in chamber 3i?. 4:5 water or other iiuid cools to or below the desiredY maximum temperature. When the control means oi my invention is ap plied to a hot water boiler or analogous apparatus, I preferably provide thermocouple means for en The other arm il@ of lever t8 extends upward gena 56 ergizing the electromagnet ld, such means being orally along.- the outer or front wall of housing heated by a pilot burner associated with the main it, and arm il is loosely pivoted at 9i to the valve burnerA or, in certain cases, by the :main burner stem tl�. The upper end portion of arm dil is itself. A 駎ting ille is screwed into a boss lll� disposed between the enlarged lower portion ed ' extending from one side of valve housing it, and of lever dil and head @i at the inner end of a reset 55 opens into inlet chamber 32. A pilot burner till, stem 9b slidable through a stuillng box ed of a of suitable known type, is connected by a tube it@ flanged screw cap 95 threaded through thick to 駎ting ltlli for supplying fuel to the pilot burner ened portion or boss 9b of the front wall of hous from a point between the inlet and outlet valves.> ing it, with an intervening gasket 9i. The So long as the inlet valve 'it remains in its open stuffing bor: @il comprises a tubular extension ed 60 position, fuel will be supplied to the pilot burner in which is slidably? mounted a .reset button @t which, after ignition thereof, burns continuously secured on the outer end of stem 93 and recessed and serves to ignite the main burner, after ex from itsinner end, as shown. A coil compres tinguishrnent of the latter, when supply of' fuel sion spring leo seats in the recessed vinner end' ' thereto is reestablished by openingof the outlet portion of button et, between which and washer 65 valvetd. The electromagnet ?it and the means ibi of the stumng box 9d spring itll� is confined. for energizing it ?may be similar to the electro The spring serves to urge stem 93 outward and also to compress the packing of the stumng 4bon to provide a duid-tight seal about the stern. _magnet and the energizing 'thermocouple therefor disclosed in my Patent No. 2,276,909. The ther ?mocouple has a hot junction l lil disposed in prox ' vWhen inlet valve 'le is released from electro 70 imity to the pilot burner i�'l so as to be heated magnet le, it is moved upward by the compres by 'the flame thereof. The internal element of sion spring 'lo into its closed position, in which the thermocoupie is suitably joined'to a lead con position of this valve arm Sd of lever te is dis ductor iii disposed within andninsulat頴d from a posed adjacent head it ci resetstem 93, arm it@ metallic tube Si@ suitably joined to the: other or being spaced away from head 92 when the valve 75 external element of the thermocouple and consti l acreage tuting a second lead conductor. This thermo in Figure 6 is similar'to that of Figure 3, except that the valve body o'r?housing 1| 0 is provided with couple may be similar to that disclosed in the pat- ~ ent to Oscar J. Leins, No. 2,126,56'1, or may be of any other suitable type. Thel thermocouple means is attached to the electromagnet housing a duct or passage |34 opening from inlet cham ber 32 into an offset |35 of outlet chamber 2d. A regulating screw |36, having a, tapered inner 16'by connector means H5 effective for connect end, is threaded through the wall of housing i0 ing lead ||| to one terminal of an energizing coil with, in its innermost position shown in Figure 6, 籺he tapered inner end thereof extending into IIS, disposed about one leg of frame ||1 ofthe _ electromagnet 19, and for connecting the tubular` the outer end of duct |34 and providing there lead ||2 to the other terminal of coil- H6. The 10 with a restricted annular orifice through which ' connector means referred to may be similar to gas or other fuel may 'iiow from inlet chamber SZ into outlet chamber 263, so long as the inlet that disclosed in my Patent No. 2,276,909, men ` tioned above, and need not be illustrated nor de valve 13 is open, providing means for supplying scribed here in greater detail. Suiiice it to state `that the electromagnet 19 is provided with a coil energized from a suitable source of electric cur rent, preferably by means of a thermocouple to the burner i5 a restricted amount of fuel for dim or low'operation thereo遱umcient to main tain the water within boiler i3 at approximately the desired-"maximum temperature during pe~ heated by a pilot burner associated with the main riods when water is not being withdrawn from burner, or, in certain cases, by the main burner. ' the boiler >or tank i3 in considerable amount. I also provide means whereby the inlet valve 13 20 'With the arrangement of Figure 6, for low or may be released from the electromagnet 19 so as dim operation of the burner i5, gas will be_- sup to be moved _into closed position, independently plied to this burner so long'as the valve 13 is of the automatic control means above described. in vopen position and independently of the clos This latter means is similar to the manual re ing of the outlet valve 34. Accordingly, if desired, lease of my Patent No. 2,276,909, and a brief de 25 the pilot burner |01 may be omitted, the thermo scription thereof will suffice. The terminal of couple being so disposed that the hot juncture coil IIB, which is connected to lead |||, is also thereof is heated by a .iet or flame of the main connected, by a lead |20, shown in Figure 7, to a burner which, if desired, may be provided with bracket 12| >carrying a contact member |22 and `a suitably directed jet opening or ori馽e for >that secured to but insulated from a bracket |23 suit 30 purpose. It will also be understood that any l � ably mounted on the lower end wall of electro other -suitable known type of burner maybe used magnet housing 16. Contact member |22 coop in place of the burner I5 shown�. It is also de sirable that the 駉w of gas to the pilot burner, , erates with a contact point |24, carried by a. re-- silient metal strip or contact spring\ | 25 secured when used, be regulated, for which purpose 駎 to the lower end wall of housing 16 in electrical 35 ting |05 is provided with'a tapered plug valve conducting relation thereto. A tubular fitting |38 of known type held seated by a compression ' |26 is suitably secured at its upper end to housing spring |39, in a known manner, this valve hav ._ : 16, withinl an opening through the lower end wall ing a slotted stem extending above 駎ting |05 thereof, and slidably receives a plunger |21 nor for reception ofi the blade of a screw driver, or mally held outward-by a coil compression spring 40 other suitable instrument, whereby the valve may |28 seating at its outer or lower end in the re be turned to regulate the amount of gas flowing cessed inner end portion of a button� |29 secured on the outer end of plunger |21. Spring |28 is . to顃he pilot burner |01. I confined between button |29 and a washer |30 seating on packing material |3| compressed about _ plunger |21 to provide a fluid tight ?closure there about. Outward movement of plunger |21 is lim - . It will be seen that under normal operating conditions, the control~means of Figures 1 to 5, inclusive, and Figure 7, is automatically operative for supplying fuel to the main burner responsive to a desired -minimum temperature and fcr cut ting oi� the supply of fuel to the burner respon-. 'ited by a?iiange. |32 thereon, adjacent the inner end thereof, and the inner end of this plunger is sive to a desired maximum temperature, so long _ disposed in alignment with the free end portion of the contact spring |25. It will be seen that as the inlet valve 13 remains in its open posi tion, the latter valve being automatically released by pushing the button |23 inward or> upward, spring |25 is deformed and contact point |24 may be moved into contact `with contact member |22. from the electromagnet and closed responsive to objectionably high temperature in excess of the desired maximum and being maintained in closed . Since lead conductor ||l is connected to housing position so long as such excess temperature per -16 and the contact spring |25 is also connected sists, by disablement >of the resetting means. lto housing 16, when the contactpoint |24 is Further, in the event of extinguishment of the moved into contact with the contact member |22, -pilot light, the electromagnet is deenergized, the current generated by the thermo-couple is thereby causing ~closing of the inlet valve, which shunted around the coil ||6. thus deenergizing 00 prevents iiow of fuel to either the -main burner the electromagnet and releasing the amature 18 or the pilot burner until the latter burner has therefrom, permitting closing of valve 13. The been relighted. In Vthe resetting operation, the button |23 . and associated parts thus provide reset button is pushed in so as to open the inlet manual release'means whereby the valve 13 may ' valve 13 andmove the armature 18 to its re be closed at the will of the operator, independ ently of -the temperature of the water or- other fluid being `heated by the main burner. It is to be understood that, within the broader aspects - of my invention, Aany other suitable means may be provided for energizing the electromagnet, and any other suitable means may be provided for releasing the inlet valve from the electro magnet or, if desired, such release means may be omitted, though it is preferred. The modified form of my invention illustrated 'NI tracted position, after which the pilot burner |01 is ignited and the hot juncture ||0 of the thermocouple is heated thereby, the reset button 33 being held in its inner position for a short time, until the coil of the electromagnet has been >properly energized, after which button 99 may be released and returned to its normal outer posi tion, the inlet valve 13 being then held in its open position by the electromagnet. The opera tion of the-modi馿d form shown in Figure 6 is .the same as that above described, except that the i. _ aci-1,220 , - "d . outlet'valve 36, when closed, does not 4coimiletely . gized by said thermoelectrlc generator effective cut .ofithe supply of fuel to the main burner, which then burns dim or low, dueto the re stricted supply of fuel thereto through the ori lice controlled by screw i3d, it also being noted that in this modiiledform the pilot burner may valve' in open position, said inlet' valve having a stem extending through said inlet port, an angle lever pivoted in said inlet chamber with one arm when energized for normally holding said inlet pivoted to said stem for moving said inlet valve into open position and in closing direction, a re set stem for moving said lever in valve opening direction, and thermoresponsive means for open ing and closing said outlet valve responsive `to be omitted, the thermocouple being so disposed that the hot juncture thereof is heated by a jet or 馻me from the main burner. As above indicated,'and as will be understood by those skilled in the art, changes in construc a desired minimum temperature and a desired - tion and arrangement of parts of my invention may be resorted to without `departing from the ? maximum temperature, said thermoresponsive 馿ld and scope thereof, and' I intend to include all such variations, as fall within the scope of means comprising a -second lever having a part normally disengaged from the other arm of said iirst lever for movement of the latter into inlet the appended claims, in this application, in which the preferred forms only of my invention have valve opening position but engageable with said been discl髎ed. ~ , other arm for moving said first lever in inlet valve closing direction and thereafter restrain- . ' , , ing it against movement in inlet valve opening 1.l In control means of the character described, 20 direction, responsive to temperature in excess of a main burner, a fuel supply conduit therefor, the desired maximum and so long as such excess I claim: means comprising an inlet valve and an outlet l temperature persists. I v ? valve for .controlling dow of fuel through said , 4. In control means of the character described, conduit, meansyieldingly urging said inlet valve a valve body having an inlet chamber and an in closing direction, a thermoelectric generator, 25 outlet chamber with` an outlet valve port there electromagnetic means energized by said thermo between, said inlet chamber having an inlet valve electric >generator effective when energized for a port, an inlet valve controlling said inlet port normally holding said inlet valve in open posi yieldingly urged in _closing direction, :a thermo tion, reset means for Imoving said inlet valve electric generator, electromagnetic means ener from closed to open position, thermoresponsive 30 gized by said thermoelectric generator effective means subject to heat generated by said main when energized `for normally holding said inlet burner effective for opening and 'closing said out valve in open position, said inlet valve having a stem extending through said inlet port, an angle let valve responsive to a desired minimum tem perature _and 'a desired maximum temperature, .and means responsive to said thermoresponsive lever pivoted in said `inlet chamber with> one 35 arm pivoted to said st'emvfor moving said inlet valve into open position and?in closing' direction, ,means and operable at a temperature in excess or? said desired maximum temperature to releasev a reset stem slldable through said valve body said inlet valve from said electromagnetic means _into contact with?the other -arm o1? said leverv for movement to closed position and to prevent for moving the latter into valve opening posi resetting said inlet valve to open position by said 40 tion, a second lever in said inlet chamber, a reset means until. the temperature to which said thermostat connected to said second lever for thermoresponsive?means is responsive drops be- _ moving it in one direction responsive to a de low said excessive temperature'. sired minimum temperature and in the opposite, 2. 'in control means o_� the character described, direction responsive to a desired maximum tem a valve body having an inlet chamber and an 45 perature, and means actuated by said second lever _outlet chamber with an outlet valve port there for opening `and closing said outlet valve respon between, said inlet chamber having an inlet valve sive to movement of said second lever in said port, an inlet valve controlling said inlet port i one direction and in said opposite direction, said yieidingly urged in closing direction, a thermo second lever being disposed'to contact said other electric generator, electromagnetic means ener 50 arm of said first lever and thereby move the gized by said thermoelectric generator eiiective when energized for normally holding said inlet latter in its other direction to releasel said in let valve from said reset means, when the tem valve in open position, a reset lever connected perature to which said thermostat is subjected to said inlet valve for moving the latter into open exceeds the desired maximum, and to thereafter position and in closingr direction, a reset stem 55 obstruct movement of said other arm of said slldable through said valve body for movingr said first lever and thereby restrain the latter against movement into valve opening position so longy lever in valve opening direction, and thermo -responsive means for opening and closing said as such excess temperature persists. outlet valve responsive to a desired minimum _ 5. In control means of the character described, temperature and a desired maximum tempera 60 a valve body having an inlet chamber` and an ture, said thermoresponsive meansl comprising outlet chamber with an outlet valve port there means for moving said lever in valve closing dl between, said inlet chamber having an inlet valve rection effective for releasing said inlet valve port, an inlet valve controlling said inlet port lfrom said electromagnetic means responsive to yieldingly urged in closing direction, electromag temperature in excess of said desired maximum ? netic means effective when energized for nor and for ,thereafter restraining said levern against mally holding said inlet valve in open position, means for energizing said electromagnetic means, an outlet valve controlling said outlet port, means comprising a snap disc for opening said outlet valve by movement of� said disc in one direction and closing it responsive to movement of said disc in the opposite direction, reset means for mov ing said inlet valve from closed to open position, thermoresponsive means,.mechanical means ac tuated by said thermoresponsive means effective movement in valve opening direction so long as such excess temperature persists. 3. In control'means of the character described, a valve body having an inlet chamber and an out lety chamber _with an outlet valve port therebe tween, said inlet chamber having an inlet valve port, an inlet valve controlling said inlet port yleldingly urged in closing direction, a thermo electric generator, electromagnetic means ener aeiaeao Ai2 '. said thermostat is subject drops below said pre. for causing movement of said disc in said vone direction and in said other direction responsive .V determined temperature.V 8. In'a'device of the class described, in com to a desired minimum temperature and to' a de sired maximum temperature. and means respon- - bination, an electromagnet, an armature for said ' sive to said thermoresponsive means and oper able at a temperature in' excess of said desired maximum temperature to release said inlet valve electromagnet, a controlling member connected to said armature, a thermocouple subject to the heat of a iiame and connected in 'circuit with said electromagnet whereby normally said arma from said ?electromagnetic means for movement to closed position and to prevent resetting said ture is held in attracted-position and said con inlet valve to open position bv said reset-means 10 trolling member in a iirst position by the thermo electric current 駉wing through said electromag- ' until the temperature to which said thermo net when said thermocouple 'is heated by said 馻me but on extinguishment of said 馻me said controlling member is moved to a second' posi 6. In control means of the character described, a valve body having an inlet chamber and an out 15 tion bythe release of said armature'by said elec tromagnet, reset means for resetting said arma. let chamber with an outlet valve port therebe ture to attracted position an'd said controlling tween and a slotted neck extending from said @member Ito said first position, and ?thermostat `outlet chamber into said, inlet chamber, said in controlled means operable at apr'edetermined let chamber. havingr an inlet valve port, a -snapy responsive means is responsive drops below said excessive temperature. . - disc mounted at its edge in said neck, an out 20 temperature to release said armature from said electromagnet for movement of said controlling wardly opening and inwardly closing?valve con trolling said outlet port yieldinglv urged inward member to said second position and to prevent re and having an inwardly extending stem disposed y > setting said armature to attracted position and said controlling member to said 駌st position by with its inner end adiacent said disc to be con tacted thereby for opening said valve when said 25 said reset means until the temperature to which said thermostat is subject drops Abelow said pre disc is iiexed outward. a disc follower slidable in determined temperature. the inner end of said neck having on its outer 9. In a device of the class described, in com face an annular Aelement contacting said disc ad bination, 'an electromagnet, an armature for said ? jacent'the edge thereof. a valve operating lever pivoted intermediate its ends in said inlet cham 30 electromagnet, a first valve member connected to said armature, a thermocouple subject to the ber with one arm contacting the inner face of heat of a flame and connected in circuit with said follower. a thermostat connected to the other said electromagnet whereby normally'said arma armof said lever ei頴ctive for moving said one ture is held in'attracted position and said iirst arm thereof outward and inward for opening and closingA said outlet valve> responsive to a desired 35 valve member is held in open position by the. minimum temperature and a desired maximum A thermoelectric current flowing through said elec temperature. an inlet valve controlling said in tromagnet when said ther?mccouple is heated by said flameA but on extinguishment of said llame let port yieldingly urged in closing direction. a said first valve member is moved to closed posi thermoeiectric generator, electromagnetic means energized by said therm骵lectric generator ei飁c 40 tion by the release of said armature by said elec tromagnet, reset means for resetting said arma tive for normally-holding said inlet valve in ture to attracted position and said iirst valve open position. reset means for moving said inlet member to open position, thermostat controlled .valve from closed to open position, and means means operable at a predetermined tempera responsive to said thermoresponsive means and operable at a temperature in excess oi said de 45 ture to release said armature from said electro magnet for movement of said 駌st valve member sired maximum temperature to release said inlet to closed position and to 'prevent resetting said valve from said electromagnetic means for move armature to attracted position and said. ilrst ment to closed position and to prevent resetting valve member to open position by said reset means said inlet valve to open positionby _said reset lmeans until the temperature to which said ther moresponsive means is ?responsive drops below said excessive temperature. ` 7. In a device of the class described, in combi ` nation, an electromagnet, an armature' for said electromagnet. a valve member connected to said armature, a thermocouple subject ?to the heat ` of a yflame and connected in circuit with s'a'd elec- . y tromagnet whereby normally said armature is held in attracted position and said valve mem ber in open position by the thermoelectric cur rent flowing through said electromagnet when said _thermocouple is heated by said flame but on extinguishment of said flame said valve mem ber is moved to closed position by the release of said armature by said -electromagnet. reset means for resetting said armature to attracted position and said valve\member to open position, and thermostat controlled means operable at aA until the temperature to which said thermostat is subject drops below. said predetermined tem perature, and a second valve member in series with said first valve member and actuated be- _ tween closed and open positions by said thermo stat controlled means at temperatures below said ' predetermined temperature. 10. In a device of the class described, in com bination, an electromagnet, an armature for said electromagnet, a >iirst� controlling member con nected'to said armature, a thermocouple sub ject to the heat of?a flame and connected in cir-- cuit with said electromagnet whereby normally said armature is h_eld in attracted position and said iirst controlling member in a iirst position by the thermoelectric current 駉wing through said electromagnet when said thermocouple is Aheated by said flame but on extinguishment of said flame said 駌st controlling member is moved to a second position by the releasefof said arma predetermined temperature to release said arma 70 ture by said electromagnet, reset means for re ture from saidl electromagnet for movement of setting` said armature to attracted position and said first controlling member to said 駌st posi tion. thermostat controlled means operable a't a predetermined temperature to release said arma said reset means until the temperature to which 75 ture from said electromagnet for movement of said valve member to closed position and to pre vent resetting said armature to attracted posi tion and said valve member to open position by 2,414,220 13 said iirst controlling member to said second posi tion and to prevent resetting said armature to attracted- position and said controlling member to said ilrst position by said reset means until the temperature to which said thermostat is subject drops below said predetermined temperature, and a second controlling member actuated between operating and shutoff positions by said thermo 14 , tracted position and said controlling member to said first position, a thermostat, an arm con trolled by said thermostat, and a pivoted bell ` _ crank lever having one arm connected to said controlling member and another arm positioned between and cooperable with `said thermostat controlled arm and said reset stem, said thermo stat controlled arm and said bell crank lever be predetermined temperature. ing operable at a predetermined temperature sensed by the thermostat to release said armature ` 11. In a device of the class described, in?com- f from said electromagnet for movement of said bination, an electromagnet, an armature for said electromagnet, a valve member connected to said amature, a thermocouple subject to the heat of a flame and connected in circuit with said electro 15 controlling member to said second position and to prevent resetting said armature to attracted posi tion and said controlling member to sa韉'駌stl position by said reset stem until the temperatllnfe'A '? to which said thermostat is subject drops bel'o stat controlled means at temperatures below said , magnet whereby normally said armature is held in attracted position and said valve in open posi tion by the thermoelectric current flowing through said electromagnet when said thermo said predetermined temperature. - 13. ?In a device of the class described, in corn; bination, an electromagnet, an armature for said couple is heated by said lflame, but on extinguish- , 20 electromagnehsa first valve member connected - ment of said flame said valve member is- moved to closed position by the release of said armature by said electromagnet, a reset stem for Vresetting ' . said armature to attracted position and said valve member to open position, a thermostat, an arm ' controlled by said thermostat. and a pivoted bell crank lever having one arm connected to said to said armature, a thermocouple subject to the v heat of a 馻me and conne'cted in circuit with said electromagnet whereby normally said armature is held in attracted position and said valve memberl is held in open position by the thermoelectric cur- ` rent flowing through said electromagnet-when said thermocouple is heated by said iiame but on extinguishment of said?flame said 駌st valve valve member and another arm positioned be member is moved to closed position by the release 1 tween and cooperable with said thermostat _con-r trolled arm and said reset stem, said'thermostat 30 of said armature by said electromagnet, a reset stem for resetting said armature to attracted po controlled arm and said bell crank lever being op sition and said first valve member to operiv posi erable at a predetermined temperature sensed by tion, a thermostat, an arm controlled by said the thermostat to release .said armature from said thermostat, a pivoted bell crank lever having one electromagnet for movement of said valve mem ber to closed position and to prevent resetting� arm connected to said 駌st valve member and an said armature to attracted position and said valve member to open position lby said reset stem until the temperature to which said thermostat is sub other arm ? positioned between and cooperable ject drops below said predetermined temperature. 12. In a device of the class- described, in com bination, an electromagnet, an armature for said electromagnet, a controlling member connected� to said armature, a thermocouple subject to the heat of a iiame and connected in circuit with said electromagnet whereby normally said armature with� said thermostat Acontrolled arm and said reset stem, said thermostat controlled arm and said bell crank lever being operable at a` prede termined temperature sensed by the thermostat to release said amature from said electromag net for movement of said iirst valve member to closed position and to prevent resetting said ar mature to attracted position and said 駌st valve member to open position by said reset stem until the temperature to which said thermostat is sub is held in attracted position and said controlling ject drops below said predetermined temperature, member in first position by the thermoelectric and a second valve member in series with said current flowing through said electromagnet when 駌st valve member and actuated between closed said thermocouple is heated by said flame but on extinguishment of said flame said controlling 50 and open positions by said thermostat controlled arm at temperatures below said predetermined member is moved to a second position by the re . temperature. lease of said armature by said electromagnet, a reset stem for resetting said armature to at HENRY F. ALFERY.