US2607415A

US2607415A - Oven burner ignition and control mechanism

Info

Publication number: US2607415A
Application number: US215439A
Authority: US
Inventors: Richard H Jordan
Original assignee: TAPPAN STOVE CO
Current assignee: TAPPAN STOVE Co
Priority date: 1951-03-14
Filing date: 1951-03-14
Publication date: 1952-08-19
Anticipated expiration: 1969-08-19

Description

Aug. 19, 1952 R. H. JORDAN OVEN BURNER IGNITION AND CONTROLMECHANISM 5 Sheets-Sheet 1 III IIIIIIIIII V N W JNVENToR.

H10/fard /Jo/cczn Aug. 19, A1952 v R. H. JORDAN 2,607,415

ovEN BURNER IGNITION AND CONTROL MECHANISM Filed March 14, 1951 5 Sheets-Sheet 2 "d r 48 36 q NNIr 7J, Qawz/ff 5 f l t' INVENToR.

4 Hic/fard b. .fo/"dan Aug. 19, 1952 R. H. JORDAN OVEN BURNER IGNITION AND CONTROL MECHANISM 5 Sheets-Sheet 5 Filed March 14, 1951 l1N VEN TOR. EQ Chard J0 ratz/7 BW NAW Nm i? .Mmf 01% ,M @im 5.1%

A TTOR NE Y.

R. H. JORDANv OVEN'BURNER IGNITION AND CONTROL MECHANISM Aug. 19,1952

5 sheefsfsheet 4 l Filed March 14, 1951v Y INVENTOR. R z @hard #J9/vda A TTORNE Y.

R. H. JORDAN 2,607,415

S'Sheets-Sheet 5 Aug. 19, 1952 OVEN BURNER IGNITION AND CONTROL MEOHANISM Filed March 14, 1951 [l tu ywhich energizes the electromagnet sufliciently vfor it to hold the normally closed valve in open is ignited by the pilot burner. The main burner will then operate under control of the oven temperature control valve as long as the main control valve is open and the -pilot fburner is ignited and heating the thermocouple and thermostatic'k element. If the pilot burner is extinguished for any reason during operation, the thermocouple and the thermostatic element will immediately cool. The cooling of the thermocouple will deenergize the electromagnet which will release the normally closed valve which will then return to its closed position and cut off the loav of gas to :both the .pilot ,burner and themain burner. The cooling of the thermostatic element will close the normally closed switch which will then effect.' re-energization of the ,solenoidv and the electric ignition element. The solenoid will then open the normally closed valve and close the normally open valve, thus supplying gasto the pilotburner only. If the Ipilot burner is then reignited' it will re-heat the thermostatic element and the thermocouple, thus rra-initiating opera tion after which the mechanism will operateas described. To terminate operation the main control valve 'is manually closed.

. For automatic operation I provide a clock actuated time Acontrol mechanism which may be set to initiate operation of the main burner at a predetermined set time'and to `terminateopera-- tion :thereof at a predetermined set later time.

The-time control mechanism includes .a 11011-,l mally open switch which is in series .with-.one ofV the. normallyopen switches associated with'the.

main `control valve.' For automatic operationthe,

time-'control is set to initiate-operation at the desiredtime and to terminate operation atthedesired later time and'then the. main control valve is turned to the proper open or on position which closes the normally open switch associatedr therewith.` lAt the set time .the time. control mechanism will automatically close lits normally open switch which will effect energization of `the solenoid and the electric ignition element after which the mechanism will function exactly the Ysame as with manual control until,v time to terminate operation, at which time the time control mechanism will automatically open the associated normally open switch which will, as is: hereinafter described, effect the cooling of the thermocouple which will de-energize the electromagnet. The electromagnet vthen releases the normally closed switch of the safety control mechanism which returns to its closed position and cuts on' the flow of gas to boththe pilot burneri and theY main burner, thus; terminating operation-1 ;f. Y. f. :The various componentY parts ofthe mechanismrare `so constructed and arrangedv that gas cannot be supplied vto either the main burner or the pilot burner in theevent the electricVignitio-n element has been broken or burned out.;

Means are also provided by which, the oven 4 burner can be manually ignited and controlled in the event of power failure.

The principal object of the invention is to provide an improved electrical ignition and automatic control system for cooking range oven burners using gaseous fuel.

Anotherv object of the invention is to provide in a device of the character described improved means for initiating and terminating operation of an oven burner which includes a thermocouple which is adaptedto be moved into and out of position to be heated by a pilot burner by which the oven burner is ignited.

' Other and more limited objects of the invention will be apparent from the following specification and the accompanying drawings forming a .part thereof wherein:

Fig. 1 is a diagrammatic layout illustrating my improved automatic ignition and control mechanism applied to a cooking range oven burner using gaseous fuel;

Fig. 2 is an enlarged central longitudinal vertical section through'the safety control mechanism showing the various parts in the positions they assume when the oven burner is turned ofi;

Fig. 3 is a view similar to Fig. 2 showing the various parts in the positions they are auto,- matically moved to when the main control valve srst turned on to initiate operation of the main oven burner;

Fig. 4 is a horizontal section, taken `on the line 4 4 of Fig. 1;

Fig. 5 is a wiring diagram of the mechanism;

Fig. 6 is a view similar to Fig. 5 showingfa slightly modified form of the invention, and

Fig. '7 is a view similar to Fig. 6 showing still another form of the invention.

Referring now to the; drawings by reference characters,V the numeral l indicates a gaseous fuel burnerwhich is mounted in or in heating relation yto a cooking range oven 2. Gaseous fuel is suppliecltov the burner I .from a manifold M through4 a conduit 3. Interposed in the conduit 3 are a main control valve ll, a safety control mechanismgenerally indicated by the numeral 5, and an oven temperaturecontrol Vvalve 6. The main control valve 4 is a cut-off valve-of standard construction having one closed or off position and two open or on positions. In either of the open positions it permits the now of gas from the manifold M to the burner l, and in the closed position it completely cuts off the now of gas from the manifold M; In one open position of the main control valve 4 the mechanism is set for-manual control and in the other open position the mechanism is set for automatic control. This valve is manually opened and closed by a handle 'I and a valve stem 8, and directly controls the'operation of the entire apparatus in that it initiates the operation'fof the entire apparatus whenrit is turned to either of the on positions, andpreventsV operation when it is turned to the off position. From the main control valvel 4 gas Hows through a connectorS vto the safety control mechanism 5, to be described in ydetail hereinafter. VFrom the safety control mechanism 5 the gas :flows through avconnector I 0,the oven temperaturev control valve f5 and the conduit 3 to the burner l. The oven temperature control valve 6 is operative toregulate the amount of lgas owing to the burner-I in order to maintain The Valve 6 liscontrolled accordingvtothe temp'erature setting-by a thermostatic element I4 which is mounted-in the oven 2 and is connected to the valvefI,J as shown at I5'. 'The oven temperatureY control---valve 6 is-'of standard well known constructions. V Consequently it-is lnot show-n in detail herein. There are many different constructions available, -any Yone off Ywhich-will work equallywell herein. Gas isals-o-supplied to aA pilot burner I6 through a branchconduit I1 which lextends between thesafetycontrol mechanism and the plotfburnerl. The-pilot burner; I5 is disposed adjacent one-endoi the main burner Iin position to-ignite the `burnerl whengas is supplied thereto. f V'An electrical igni. tion'element I8is voperatively associated with the pilot burner I6-in position toii'gnite thev pilot burner I6 when vgas is supplied thereto.y 1 A--ther-y mostatic element I9 is mounted :in-"position to-jbe heated# by Va l'ame'fromjthe pilot' burner'.v The thermostatic element iis'operative'to open and close a switch 2I which v'controlsthe energica-- tion of the electrical ignition elem-ent` I8 andlaV solenoid 22 which when energized operates" thev safety control mechanisinto supply gas to the pilot burner I6, as will `be'described in lconnection withf'th'e description o ,f the saisty control mechanismand the operation of lthe `whole appa-- ratus. A therrnocouple which-is 'carried byja pivoted'arrn21: adapted to be moved into Vand out Vof 'position to be heatedby the pilot burner I6, as shownby theA full line and dotted line por-4 tionsk in Fig. 1. 'The .thermocouple 2D when heated is operative to hold the safety: control mechanism in condition to maintain the .supply of gasto. bothlthe pilotfburner' I6 and the main burner I, as willy alsol be described inconnection" with the description of the safety control mechafv nismjand the operationv of the'apparatus A A pairfof normallyiopen "master, switches-2.3 and' `24 areA operatively associated' with the valve s'tem ofthe maincontrolvalve 4 and aregadapted -to be closed and opened by the opening andclosingof` thervalve '4J As `tl'ievalve stem Bris turned" in a clockwise direction toV set the valveinfon'el open position, the switch 2 3 is closed byv a cam`25 on 'the'valve stem 8 .through a link 26; andwhen the valve stema is rotated ina counterclockwise directionto set theuvalve 4 in its otheropen' position, the switch 24 is closed by the' cam 25 through they link 26. Conversely `when the valve 4` is turned from either open position to the closed position the closed switch 2-3 or24 will be opened.'

The construction of the safety control valve mechanism 5 and its connection to the solenoidl 22A will now be4 described, reference being had to v Figs. A2, `3 and 4 .ofthe drawing. This mechanism comprises a casingV having a chamber `36 in one end thereof and a'chambery 31 in the "other endthereof. The chambers 36 and 31 are connected by a bore-*38 vof-'reducedl diameter. A valvey seat- 39 is located at one end of the bore 38 and' a similar Valve seat 48 is located at they other end ofthe bore 38. VThe chamber 36'isclosed by a removable-*cap 4I andthechamberi31 is closed' by aremovable cap 42. VAfsleeve 4`3fhaving-end walls 44- and 45, isvcarried by the Acap4t` and exj` tends' into "the chamber 36. A Valvev stem l'4'6" which.

is slidably mounted in a bushing 41 carriedjbythe end wall 45 ofy the sleeve 43,"extendsf'rom the chamber 36vinto thev sleeve 43. Alfvalvediscicliy of` suitable material is secured to one end ofA the valve stem 45 within the` chamber; 36, anda metal discs49 issecuredto thel other endlof'the' stem 46 within the: sleeve 43.' 'A spring-5i) disposed abouti-,he -valvestexn' 46v between the valvef." isc 48 andthe end wall 45 of thersleevef43i, normally holds thelyalve disc 43 against the valveis'ea't'f-SS'. Anelectromagnetf5l is secured. to' one ,endotia hollow exteriorly threaded stud 52 which extends out through aligned apertures in the end wal1'44, of thesleeve A43, and. in the `endo-.E the vcap 4I.. A nut153' secured onto the 4outer portion '.of'f the stud 152: securely holds thefrnagnet 5I andthe sleeve 43. in place. The legs of the electromagnet I-have a-winding54 thereon, one end of which isconnected to a copper tube 28 which extends, between the thermocouple 2i? and the safety: control 5, and the other end 0'1" whichis connected to an insulated wire 29 within the 4tube 28. .f Thev tube 23 and the -wire 29 therein establish an elec-i` tric A.circuit between the thermocouple 20andfthe windingr54 of theelectromagnetm. rThe tube 28 is'sin'sertedinto the hollow stud..52 andA is held in. Aplaceby a screw --fitting Sit. "A sleeve 55 'is screwed into. a threaded recess in the end of the cap 42;*as indicated at56, and extends intothe` chamberf31 a slight distance. One'end of the sleeve 55 is'closed by an end wall 51, and the otherendwhioh is open registers with. a circular aperture 58 in the end wall ofthe cap 42. A ,plug

59 isslidably mounted in the sleevef55` andextendsoutthrough the aperture 58 inthe cap'f42. The'ou-ter end'of the plug 59 hasa reduced ex-a tension 60- formed integral therewith, providing anr annular shoulder 6I around' the extensionll" at the outer' encor the plugI sa. .A Stemra which is securedA tothe inner `end oi the plugVV 59; extends out through-an aperture/53', in the'end wall- 5 1 ofthe sleeve 55, and through the chamber `31= andinto the borel. The'sternv 62has-'a'colla'r 64 rigidly securedfthereon between tlieendfwalli' 51 andthe outer end of the stem. A valvefdisc 65' of rsuitable materialisslidably mountedrupon: the stem 62 between. the end'wall 510il the sleeve 55 and the collar 54.1 Thefvalvedisc 55 is adapted to engage the valve seat 54) lto cutofi thei flowl ofF gas finto the chamber: 31 during the initiation of JfOperatiOn, las-'will be vhereinafter described.y

. Aeompression spring 55,' disposed about-'the'stemlv 62 between' the end wall 5.1i and `ther'f'val'vediscrv 65,1' normally yieldinglyholdsthe valve disc against the `-collar 64. A compression spring 61 Vwl=l1cl1-f`isstrongerthanthe spring 5&3y isdisp'esed about the stem 6-2 within thesleeve 55-between-the innerface of thevend wall 51 and the inner end of theplug- 59 The spring 61 isroperative to returnlthe plug4v 59, stem 62 and valve disc 65 `from thepositi'on shown'in Fig. 3 back-to their normal` position as shownf in Fig. 2, against the resistance of the spring y66; vA -portiilv inthe 'casing 35 provides communication 'between' the chamber 35 andi the' connector 9 to' allow gas to Aflow from the main control valve 4 through the connector 9 and into thechamber. During normal operation ofthe' main burner I gas flows from the chamber-35 through the? reduced intermediate boreA g'and intofthechamber 31. A port-69 which establishes'` communication between the conduit `I1 and the bore -38 Eis provided to rsupply gas to the pilot burner-'15; anda `port-1) establishes communi-Y cation between' the 'chamber 311 *and'theconwk nestor lov to permit-the new of eas fromffth'e chamber 31 tothe mainburner I through-fthe oven temperature-control valve 5 and the :con-

The safety control valvey mechanism 5de operatively connected to the-solenoid 22 by a yoke-12 anda link 13. The yoke- 12 which encompasses the safety control valve n'iechanisrn-E,` as shown' in Eig. 4, comprises a pair of spaced parallel arms 14;.which are connected together at one end by a bridge15. The bridge 15 has an aperture 16 therein through which the reduced end 60 of the plug v59 extends with the inner face of the bridge engaging the shoulder 6| between the plug 59 and the reduced extension' 69 thereof. The other ends of the arms 14 terminate in a pair of spaced parallel ears 11 to and between which one end of the link 13 is pivotally connected. The other end of the link 13 is pivotally connected to the movable core 18 of the solenoid 22, as indicated at.19.v

The arm 21 carrying the thermocouple 20 is pivotally secured, as indicated at 8U, and is adapted to be moved from the full line position shown in Fig. 1 to the dotted linepositiontherein by a solenoid-transformerl and a link 82 which is pivotally secured to the arm 21 at 83. A spring 84 which is connected to the link 82 biases the arm 21 and thermocouple 20 to the full line position. A stop 85 is provided to limit the movement of the arm .21 by the spring 84.y Y Y The solenoid-transformer 8| comprises a stationary core 85, a movable core 86,v a primary winding 81 and a secondary winding 88.

In order to accommodate the mechanism for automatic control, I provide a clock operated time control mechanism 98' of standard construction which comprises a clock 9| and a normally open switch 92 which is adapted to be automatically closed and opened at predetermined times according to the setting of the clock 9|, which may be. set as desired by the buttons 94 and 95. The switch 92 is disposed in Series with the switch 24 and is operative when closed to initiate and maintain operation, of themain burner I.

The operation of the apparatus independently ofthe time control mechanism will now be described in connection with Fig. 5. To initiate the operation of the oven burner I it is only necessary to set the Oven temperature control valve AI5 to the desired temperature and to turnmanually the main control valve 4 clockwise from the loff position to one on position. After that the ignition'and operation of the burner are automatically controlled until the operation of the burner is-terminated by manually turning themain control valve 4 from the on position to the off posi-IV tion. As the main control valve 4 is turned from the off position to the on position the master switch 23 is closed by the cam 25 and link 25. After the main control valve has been opened gas can ilow from the manifold M through the main control valve 4 and into the .chamber 36 of the safety control valve mechanism 5, the various parts of which are in the position shown inFig. 2. But the gas can go no further since the Valve disc 48 is being held against the valve seat 39 by the spring 59, thus closing the only exit from the chamber 36. As soon as the switch 23 is closed current ilows from the positive side v|09 of the lineY through the lead IDI to the switch 23. ltorrr the switch 23 the current flows through thelead |92 to one side of the primary winding 81, of the solenoid-transformer 8|, and from the other side of the primary windingl 81back to the other side |03` of the line through the leadI 94. VThe electric resistance lignition element I 8, the Vnormally closed switchv 2| andthe solenoid 22 are all con-V nected in series with thesecondary windingr of the solenoid-transformer 8| by the leads |05, |06, |91 and |08. The closing of the switch 23 thus energizes the solenoid-transformer 8| which through the movable core 86 thereof and the link 8 82 moves the arm 21and thermocouplemirom the full Aline position ,toA the dotted ,line position (Fig. l), thusbringing the thermocouple 2D into position to be heated by the pilot b urner I B. The solenoid-transformer 8| whenA energized: also through the secondary winding'and circuit I 05 vvto |08 energizes the electric resistance ignition ele-v ment I 8 and the solenoid 22. 'I'he secondary current generated by the solenoid-transformer 8| is of much lower voltagerthan the line current. The electric ignition element 8 and the solenoid 22 are Vnow` both energized. v The energizing of the ignition element I8 renders it operable to ignite the pilot burner :I8 as soonras gas is supplied thereto, and theenergization of the` solenoid 22 causes it, through the link 13 and yoke 12, to shift the variousparts of the safetycontrol mechanism 5 from the position shown in Fig. 2 to the position shown in'lig.A V3. In.v this position the valve disc 48 is held away from the valve seat 39 and the metal disc 49 is held against the ends of the legs of the magnet 5I by the stem62 acting against the resistance of the spring 5D. 'Ivhis allows gas to now from the chamber 38 into the bore 38 and thence through the port 69 and conduit |1 to the pilot burner VI6 where it is ignited by the ignition element I8. But the gas cannot yet ow to the main burner Vsince the valve disc 65 is beingfheld against the seat 4|) by the spring` 88 whichcuts oi communication between the' bore 38 and the chamber 31. As soon? a'sthe pilot burner I8 is ignited it projectsy a flame against and heats both the thermocouple 2|] andthe thermostatic relement I9. The heating of the thermocouple 20 generates'a minute current of the order of .009 to .017 volt which energizes the electromagnet 5| suiciently for it t0 hold the metal disc 49 and the stem 46 and valve disc 48 secured thereto in the position shown Vin Fig. f3

against the' pressurev of the spring '5D after theV disc 49 has been moved into engagement with the magnet 5|. by the Vsolenoid 22.-V` But the mag'- net 5| when energized bythe thermocouple 2|] is t not strongenough toattract and withdraw the metal disc 49, and the ystemmi and Valve disc 48 secured thereto, from the "position shown'in Fig'. 2 tothe position .shown in'Fig3. ItV Vc'an'j only hold these partsV in this position after they have been moved' theretoby the solenoid 22 through the medium of the'link 13, yoke 12, yplunger 59- Thev electric .circuit between the` and stem 62. thermocouple 2D and the winding 54 of the magnet 5|v is through rthe copper ltube 28 andthe wire' 29.V Afterthev thermostatic element I9 has been heated suiiiciently, which is after the` thermocouple has energized the magnet 5I, it

will openv the normally closed switch 2 I, breaking the circuit t0 and de-energizing both the ignition element I8 and thev solenoid 22. After the'pilot burner has been ignited there is no further need to maintain the ignition element'energized. As soon as the solenoid 22 isde-energized the spring 61 will return the plunger59, stem 62 and valve disc 65 back from the position shown in Fig. 3 to the positionl shown in Fig. 2 against the pressure of the spring 65.w The valve disc 48 will beheld inthe position shown in Fig. 3 by the magnet 5|'.

Communication is then established between'the chambers 35 and 31` through the bore 38. Gas will then ow from the chambery:` into the chamber 31V through the bore 38. From the chamber 31 gas will ow through the oven tem'- perature control. valve 6 and a conduit 3 tothe m'ainburner I whereit willbe ignited by the pilot burner i6. Theapparatus is now operating nor- 9l mally, and in the absence of any abnormal condition it will continue to do so, provided the pilot burnerreinains ignited, until the supply of Agas to both the Vpilot burner and the main `burner is cut oil by the manual closing ofthe main control Valve 4.

In the event the pilot burner I6 is extinguished for any reason during operation, the thermocouple 20 will cool in a few seconds and deenergize the magnet 5 I. The de-energizing of the magnet 5I will allow. the spring 50 to move the valve disc 48 back into engagement with the valve seat 39, as shown in Fig. 2, which will cut off the flow of gas/from the chamber 35 intoV the bore 38 and chamber 31,. and from them to the pilot light I6 and the main burner I. The burner I will then be extinguished along with-the pilot burner. As soon as the thermostatic element I8 coolsit willclose the' switch: ZI lwhichv'vill'energize both the ignitionelement I3 andthe solenoid 22, as previously described, provided the ignition element I8 is intact, since the main control .valveY 4 is still open and the switch 23 is closed. The pilot burner I6 will then be re-ignited and the vrest of the apparatus will again functionas described, provided thereis gas available.l If no gas is available, everything will remain in condition to ignite the pilot burner and re-initiate operation as soon as vgas is again available. r f

If, however, the ignition element I8 has been broken or yburned out or otherwise affected so that current cannot pass therethrough, the solenoid 22 cannot be re-energized since it is in series with the ignition element IB. Consequently the valve 48 will remain closed, as shown in Fig. 2., cutting off the supply vof gas tobothy the main burner and the pilot burner. In the event of either a momentary or prolonged .power failure during operation, the apparatus will continue to operate normally until terminated vby .the manual closing of the main control valve, provided of course that all` other conditionsare normal. In order to operate Ithe apparatus dura prolonged power failure which occurred prior to operation, I extend the link 82 so that it can be engaged and shifted by the cam25 to movev the arm 21 .and thermocouple 2U from the fullline to the dotted line position as the main control valve 4 is opened by a clockwiseA movement of the,` valve stem Thus in the event r power is not available, the main burner I can be operated by opening the main control ,valve 4 in a clockwise direction and then holding a match to the pilot burner I6 and manually moving the plunger 59 from the position shown in Fig. 2 to the position shown in Fig. 3 and holding it in this position a suicient time for the thermocouple 2a' to become heated, aiter which the plunger niay be released and allowed tobe returned to its initial position by the spring 6.1. The apparatus will then continue to function normally as described, under the control of the pilot yburner I6 and the oven temperature control valve 6.

When the apparatus is used in conjunction with the time control mechanism SB, the time control mechanism isset to initiate operation of the main burner I at a predetermined time and to terminate operation thereof at a predetermined later time. After the time control mechanism has been set, the main control valve 4 is manually opened in a counterclockwise direction which closes the master switch-.24. v Then at'the predetermined set time the time control mechanism will close the switch 92. Current will then flow from the positive .side |00 of the Yline through the lead |09 to 'the' switch 24. `From the switch 24 the current will flow through the lead I I0 to the switch 92 and from the-switch 92 tol the primary winding 81 of the solenoid-'transformer BI through the leads I I'Iv and |02. From the winding 81 the current willflow back tothe negative side |63 of'the line throughfthelead H34, thus completing thef :circuit to andV energizing the solenoid-transrormer.y rlhe solenoid-transformer will thenfmovefthe. thermo'couple into posi- `tion to be heated by fthepilot burner' and energize the ignition-element I8 and-solenoid 22 which will vinitiate". operation, as previously described. The main burner' YI will then` operate under the controll of: the pilot burner v1I mandi-oven temperatur'ercontrolvalvev, as previouslydescribed, until its 'operation' `is 'terminated'by they opening ofthe switch 92 bythe .clock 9|. Theopening of the switch 92 will break the circuit to the solenoidtransforiner BI which will allow the spring 84" to shift vthe arm 21 and? thermocoupleZi from the dotted line position back tothe full line position in which position the theri'noc'ouple will immediatelycool. The cooling of the thermocouple 2'0 will (ie-energize rthe -electrornagnet l5I which will thenrelease the valve: 48', which, when released, will return tol closed position and? cut off the supply of gasto both the mainb'urner' and the pilot burner, thus terminating operation.:v The main control can' then be manually closed any time later.

- In Fig. 6 I have shown a slightly modified form of the invention.` In this form of the invention I'connecty 'the solenoid 22 directly to the. line mii-H23 by theleads H5 and III, and Iinterpose a .relay` I I1 in the secondary circuit |05 to UBB in place'of the solenoid'22.A In the lead'l I5 betweenk the line IIJIl-IDS-and the solenoid 22,-1

interpose a normally open switch lI I8 which is biased Ato .open positionfby a'spring I I9. -The relay Il?!v 'is disposed in operativerelation to the switch H3 and is 'operative when energizedto maintain-the;` switch IIB` in :closed position.

`Otherwise the construction and operation ofv this f. In-the formA of theinvention when the switch I f 23 or the

switches

24 and 92 `are closed the ysolenom-*transformer 8| will move the thermocouple 29 into heat' exchange" relationship with the-pilot burner it, and will effect the energization of the electric ignition element I8Y and the relay II1. The relay `I I1 will then close the switch IIB, therebyj energizing the solenoid 22 which will actuate the safety control valvemechanism 5 to supply gas tothe pilot burner' It where it is ignited by the electric' ignition element I8. The pilot burner will then heat both the thermostatic element I9 and the thermocouple 2li. The heating of the thermocouple 20 will energize the electromagnet 5I and render it operative to maintain thegvalve 48 of the safety lcontrol valvemechanism 5 open after the solenoid22 has been deenergized, andthe heating of the thermostatic element'llwill cause it to open-the normally closed switch 2Iin the secondary circuitwhichwill de-energize the electric ignition element I8 and the relay I I1. The spring IIB will then open the switch IIB and de-energize the solenoid :i2 after which the apparatus will operate as previously described in connection with Figs. l to 5.

- In Fig. 7 I have shown still another form ofthe invention. In this form of the invention I move the pilot burner I6 into and out of heat exchanging Yrelationship with respect to the thermocouple instead of movingV the thermocouple 20 into and out of heat exchanging relationship with respect to the pilot'burner IB'. As shown in Fig. I'7, I mount the pilot burner I6 and the thermo- Acouple v2D side by side in a fixed bracket |20, the pilot burner I6 being mounted for rotary movem'ent therein but restrained from linear movement. -A bell crank 2| which is pivotally securedat |22 to the bracket |20 has one arm |23 thereof pivotally connected'to one end of a link |24 and the other arm |25 thereof connected to the pilot burner I6 by a pin and slot connection |26. The other end of the link |24 ispivotally connected Yto one arm |2l-of a bell crankA |28 which is rotatably mounted upon a fixed stud |29. The other arm I 30 ofthe bell crank |28 is connected tothe link 182 .by a pin and'slot connection as indicated at 3| In"v this form of the invention when the switch 23 or the switches 24and 92 are closed the solenoid-transformer 8| will move the bell cranks |28 and l2l'from`the full line positions to the dotted line positions which will rotate the pilot burner 6 in vthe bracket Y|20 and bring the jet |32 of the pilot burnerv I6 into position to projectY a ame against and heat the thermocouple 20. The closing of the switch 23 or the

switches

24 and 92 will also effect energization of the electric ignition element 8 and the relay l, after which'the apparatus will operate as described in connection with Fig. 6.

' If desired, in this formV of the invention the relay ||7 may be eliminated and the solenoid 22 placed in the secondary circuit as shown in Fig. 5.

"From the foregoing it will be apparent to' those skilled in this art that Ihave provided a very simple and efficient apparatus for accomplishing the objects ofthe invention.`

It is to be understood that I am not limited to the specific construction shown and described herein as various modifications may" be made therein within 'the scope oftlieappended claims.

' What is'claimed is:

' 1. In an automatic ignition and control apparatus of the characterdescribed, the combination of a main burner, a Apilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extendingbetween said safety control valve 'mechanism and said pilot burner through which'gaseous fuel is supplied to said pilot burner, said safety control valve mechanism beingy operative to control the supply of fuel to said main burner` after said main controlvalve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main` burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple adapted to be moved into and out of position to be heated by said pilot burner, an electric circuit; between said thermocouple and said electromagnet through which said electromagnet is energized bysaid thermocouple when heated. a solenoid-transformer having a primary winding and la secondaryl winding, a master switch operative when closed to effect energization of said solenoid-transformer, a primary circuit which includes said primary winding and said master switch, a secondary circuit in which said electric ignition element, said solenoid and said secondary winding are disposed in series with each other, said solenoid-transformer being operative when energized to move said thermocouple into position' to be heated by said pilot burner and to energize said electric ignition element and said solenoid, and means operative to break said secondary circuit and de-energize said electric ignition elementand said solenoid after said pilot burner has been ignited by said electric ignition element. Y y 2. In an'automotive ignition and control apparatus of the character described, thefcombination of a main burnerga pilot burner operative to ignite` said main-burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner and said Ipilot burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control -valve and said main .burner and operative to control the supply of fuel to said main burner and said pilot burner after the fuel leaves said main control valve, a secondary conduit extending between said safety control vvalve and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism including a normally open valve and a normally Vclosed valve, a solenoid operatively connected to said safety control valve mechanism, said solenoid being operative upon energization to close said normally open valve and to open said normally closed valve and upon subsequent deenergization to reopen said normally open valve,

an el'ectromagnet associated with said safety control valve mechanism and operative when en ergized to maintain said normally closed valve open after it has been open by the action of said solenoid whereby fuel is first supplied to said pilot burner only. and then upon the subsequent de-energization of said solenoid fuel is supplied to both said pilot burner and said main burner, a thermocouple adapted toibe moved into and out of position to be heated by said pilot burner, an electric circuit between said thermocouple and said electromagnet through which said electromagnet is energized by said thermocouple when heated, a solenoid-transformer having a primary winding and a secondary winding, a master switch operative when closed to effect energization of said solenoid-transformer, a primary circuit which includes said primary winding and said master switch, a secondary circuit in which said electric ignition element, said solenoid and said secondary winding are disposed in series with each other, said solenoid-transformer being operative when energized to move said thermocouple into position to be heated by said pilot burnerv and to energize said electric ignition element and said solenoid, Yand means operative to break said secondary circuit and de-energize said electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element.

3. In an automatic ignition and control apparatus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition ele- 'ment operative'to ignite rsai'dirpilotburner, a concondition to supply -fuel to 'said pilot burner and said main burner; an "electromagnet associated with saidl safety control' valve mechanism and operative when energized tomaintain saidfsafety control valvev mechanism in said setcondition, `a

thermocouple adapted to be moved into-and out of position'to'be heated by said'pilot burner` means rendered operative by the opening of said main control valve to; move said thermocouple into position tobe' heated by said pilot burnena transformer having ya""primary windingand a secondary winding, a master switch operative when closed to effect 4energization of said-transformer, a primary circuit whichjincludes said primary windingand said master switch`,a secondary circuit inI whichY said electric" ignitionelement', said solenoid and said secondary-winding are disposed in serieswith each other, said transformer being operative whenY energized toenergize said electric Aignition element 'and said solenoid, and means operative tobreak said secondary circuit and cie-energize sai'dielectric'gnition element and said solenoid after said pilot burner has been ignited by said electricignition element. j

` A4. Iny ran automatic4 ignition' and 4f control apparatus, of thefcha'raoter desoribed,".,the combination of a mainburner, a' pilot 'burner operative to ignitesaid mainlburner, an' electricignition element operative to ignitek said pilot burner, a conduit throughA ,which gaseous-fuel vis supplied to said main burnena manually operable main control rvalve by whichfthe supply offuel tosaid main burner is primarily controlled,- a safety control valve. mechanismlint'erposed lin 4said, conduit between'fsaidmain. control valve and saidmain burner,y a secondary. conduit extending between said safety controhvalve mechanismwand saidv pilot burner through whichjgaseous fuel issupplied to said pilotburner,V said safety control valve mechanism being operative to control the supply offuel to said main burner aftervsaid4 main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuelto said .pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control .valve mechanism inisaid set condition, a thermocouple adapted to be moved into andl out of position to be heated-'by said pilot burner; an electric circuit between -said ltherrnocouple-and said electromagnet through .which said electromagnetis energized by said therniocouple when heated, a solenoid-transformer having a primary winding and a secondary winding, a' master switch operative when closed toeffectenergization of said solenoid-transformer, a primary cir-- cuit which includes said primary winding and said master switch, a secondary circuit in which`A said electric ignition element, said solenoid'and 514 said-secondary winding are disposed in series with each other, said solenoid-transfonnerbeing voperative when. energized to move said :thermocouple into position to be Vvheated by said-'pilot burner and to energize 'said'elec-tric ignition element and said solenoid, and meansoperative to break said secondary `circuit and deeenergize said electric .ignition element and said 'solenoid' after said pilot burner has beenignitedv by .said electric ignition element, said means comprising'a normally'closed switch insaid secondary circuit and a -thermostatic element adapted to be heated by said pilot burner andA operativewhen heated to open said normally closed switch. 1I

V`5. In an' automaticignitionand cor'itrolappa-` ratus of the character.- described, the combination of a main burner,v apilot burner operativev to ignite said main-burner, anelectricignition ele'-y ment operative tio-ignite' said pilot burner, aconduit through which gaseous'fuel is'supplied to said main burner,` a manually operable main' control valve by which the supply of fuel tosaid main burner is primarily controlled, a safety `control lvalve mechanisminterposedY in said conduit between said main` controlv-alve and said main burnerf'a secondaryV conduit extending between said safety control valve mechanism and said pilot burner vthrough whichl gaseous fuelis'supplied to saidV pilot burner, said safety controlvalve mechanism being operative'to control the supply Y of 'fuel to said main'burner after said main con` trol valve has been opened, a solenoid by which said safety control valve mechanism is set incondition to supply fuel to 'said pilot `burner and said main burner, an electromagnet associatedlwith said safety control valve mechanism and `opera- .tive lwhen energized .tcmaintain said' safetycon-f trol valve mechanism in 'saidl set condition, a thermocouple adapted to .be movedjinto and' out of position to be heated by' said pilot burner, means rendered operative by the opening of said main control valveto move said thermocouple into position Lto be Vheated by said pilotburner, a transformer having a Aprimary winding and a f secondary winding, a. master switch operative when closed to-eife'ct energization ofsaid trans` former, aprimary circuit .which includes said primary winding and'said'master switch;v a secondary circuit in which said electric ignition element,`

said solenoidand said secondary winding are dis-v posed in series with each other, said transformer beingI operativev when energized to energize said electric ignition element and said'solenoid, .and means operative to Vbreak said secondary circuit and de-energize said electricignition element and saidv solenoid after said pilotburner has been ignited bysaid electric ignition element, said means comprising a normally closed; switch in said secondary circuit and a thermostatic element adapted to be heated byf-said- 'pilot burner and voperative when :heated toppenY said 'normally closed switch. l

, 6. Inva'n automatic `ignitionwand controlv apparatusv of the4 character described, rthe combina-l tion of a main burner, a pilot burner operative toY ignite saidmainburner, anelectric'fignition elementv operative' to ignite said pilot burner, .a conduit through which gaseous fuel issupplied vto said' lmainburner, a fmanually operable main control valve byv which the supplyuofk fuel ytov ,said main burner is primarily controlled, .a :safety control valve mechanisminterposed in said conduit between said maincontrol valve, andrsaid main burner, asecondary conduit; extendingfbetween said safety Acontrol valve mechanism: and

A said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to controlthe supply of fuel to said main burner after .said

main control valvehas been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and-said main burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple adapted to be moved into and out of position to be heated by said pilot burner, an electric circuit between said thermocouplezand said electromagnet through Vwhich saidelectromagnet is energized by said thermocoupleA when heated, a solenoid-transformer having a primary'winding and a secondary winding, a: master switch operative when closed to effect energizationof said solenoid-transformer, a primary. circuit which includes said primary winding and said-masterswitch, a secondary circuit in which saidA electric ignition element said solenoid and said secondary winding are disposed in series with each other, said solenoid-transformer being. operative when energized to move said thermocouple into positionv to vbe heated by said pilot burner and to .energize said electric ignition element and said: solenoid, .means operative Y to break said Vsecondary Vcircuitand de-energize said electric ignition element and said solenoid after said -Vpilotrburner hasrbeen ignited by said electric ignition element, and clock actuated time control mechanism operative to close and open said master switch at predetermined set times.

V'7. Inan automatic ignition and control apparatus of the character described, the combination'of a main' burner, a pilot burner operative to ignite'saidvmain' burner, an electric ignition element operative to ignite said pilot burner,a conduit through which gaseous fuel is supplied rto said main burner, a manually operable main controlivalve by which the supply of fuel to said mainr burner is primarily controlled, a Vsafety control `valve mechanism interposed in said conduit'between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through whichwgaseous fuel is supplied to, said pilot burner, said safety control valve mechanism being operative to control the supplyrof fuel to said main burner after said main control valve has been opened, asolenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a`thermocouple adapted to be moved into and out of vposition to be heated by said pilot burner,l means rendered operative by the opening of said main control valve to move said thermocouple into position to be heated by said pilot burner, a transformer having a primary winding and a secondary winding, a master switch operative when closed vto effect energization of said transformer, a primary circuit which includes said primary winding and said master switch, a secondary'circuit in which said electric ignition element said solenoid and said secondary winding are disposed in series with each other,'said transformer being operative when energized to energize said electric ignition element and. said solenoid, means operative to break said secondary circuit and de-energize said electric ignition element and said solenoid after saidipilottburner has' been ignited. by said electric ignition element, and clock actuated time controlmechanism operative to .close and open said master switch Vat predetermined set times.v Y

8. In an automaticr ignition and control ap paratus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignitesaid pilot burner, a conduit through which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit betweensaidmain control valve and Ysaid main burner,A a secondary Aconduit extending Abe tween said safety control valve` mechanism and said pilot burner through which gaseous fuel is supplied to saidpilot burner, said safety control valve mechanism being operativev to control the supply'of fuel yto said main burner' after said main control valve has been opened, arv solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and'saidmain burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety- .control valvemechanism in saidset condition, a thermocouple adapted to ybe movedinto and out of vposition to be heated by said pilot burner, an electric circuit between saidrtherm'ocouple and. said electromagnet through which said electromagnet is energized by said thermocouple when heated, a solenoid-transformer having a primary winding and a secondary Winding, a master switch operativewhen closedto effect energization of said solenoid-transformer, a primary circuit ,which includes said primarygwinding and Ysaid master switch, a, secondary circuit in which said electric ignitionelement said solenoid and Ysaid'secondary Windingare disposed in series with each other, said solenoid-,transformer being operative Awhenenergized to jmove said thermocouple into position to be'heated by said pilot burner and to energize said electricignition element and said solenoid, means operative to break said secondary circuit and de-energize said electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element, and clock actuated time control mechanism operativev to close and open said master switch at predetermined set times, said means comprising a normally closed switch in said secondary circuit and a thermostatic ele-V ment adapted to be heated by said pilot burner and operative when heated to open said normally closed switch. e

9. In an automatic ignition. and control apparatus ofthe character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, ya conduit through which gaseous fuel is 'supplied to said main burner, control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said mainV burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel'is supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control Valve has been opened, a solenoid by which said a manually operable main safety control.. valvemechanism isA set in condition to. supply fuelto.v said pilot burner and said main burner, an electromagnetfassociated with said safety control valve mechanism and operative when energized to. maintain said safety control valve mechanismin said set condition, athermocouple adapted. tov be movedV into and out of posi-tion.. to be heated by said pilot. burner, means rendered operativeby the opening of saidmain control valve to move. said. thermocouple into positionto be heated by said pilot burner, a transformer having a primary Winding and a secondary winding, ay master switch operative when closedV to effect energizationy of said transformer, a; primary circuit which includes said primary winding and said master switch, a secondary circuit. inv which said electric ignition element said solenoid and said secondary winding are disposed in series witheach other, said transformer being operati-ve when energized to energize said electric ignition element and said solenoid', means operative to break said secondary circutandde-energizesaid electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element, andclock actuatedtime-control mechanism operative to close and open said master switch at predetermined, set. times, saidmeans comprising ai .normally closedswitch in said secondary circuit and a thermostatic element. adapted to be heated by said, pilot burner andI operative when heated'to open said normally closed switch.

Inan: automatic ignition and control apparatus ofthe; character described, the combination ofv a main burner, a pilot burner operative to ignite saidv mainburner, an electric ignition element. operative toignite saidy pilot burner, a conduit through.v which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burnen. a secondary conduit extending between said safety control valve mechanism and said pilot. burner through which gaseous fuel is suppliedA tosaid pilot burner, said safety control valvemechanism'. being operative to control the supply ofy fuel to said, main burnervv after sai-d main control. valvel has been opened, a solenoid by which. said. safety control valve mechanism is sety in l.condition to 4supply fuelzto said pilot' burner and saidzmain burner, an electromagnet associatedr with said safety controll valvemechanism and; operative when energized to maintain said safety control valve.- mechanismv in said set condition,I a-thermocouple adapted tobe moved into and' out. of positionto be heated by'said pilot burner, a camv associated with saidmain control valve and operative'to move said thermocouple into: position. to Ibe heated. by said piloty burner simultaneously with the opening of said main control valve, a transformer having a primary windinganda secondary windinga master switch operative when closed to effect energizationof said transformer,V aprimary circuit which includes .said primary winding and said master switch, a.Y secondary circuit.V in. which` said electric. ignition'. element. saidf solenoid and said secondary winding are disposed..` in series with each other, said transformerY beingJ operative when.. energized ta energize said electric `ignition element and said.,solenoid,y and means operative to break said secondaryI circuit andA de-energizesaid electric ignition elementandl said solenoid: after said pilot burner has been ignited by said electric ignition elementi 11. In anv automatic. ignition and control apparatus of the. character described, the combination of a' main burner, a pilot burner operative to ignite said main burner, anV electricv ignition element operative to ignite said pilot burner;` a conduit through which gaseous fuel isgsuppliedpto said main burner, a manually operable` main control valve by: which the supply of fuel to` saijd 'main burner is primarily controlled, a safetyLcontrol valve mechanism interposed'in said conduit between saidA main` control valve and; said main burnen, a secondary conduit extendingfbetween said safety control valve mechanism and' said pilot, burner through which gaseous' fuel i'sj' sup'- plied to said pilotl burner,.said' safety control valve mechanism being operative to control the supply of fuel to. said main burner, after said maincontrolvalvelha's beenopened,` a solenoi'dby which said. safetyv control: valve mechanism is set. incondition. to supply fuel to said' pilot' burner and said main, burner, an electromagnet'associated with said. safety control valve mechanism and operative. when energized to. maintain Said safety controlvalve mechanism in said seticondi'- tion, a thermocouple adapted to bemovecl into and out ofv position tov be heated' by' said' pilot burner, a cam associated with said main control valve and operative to move said thermocouple into position to be heated by said pilot burner simultaneously with the opening of said main control valve, a transformer having a primary winding. anda secondary winding,l a master switch operative when closed 'to effect. energizationv of said transformer, a. primary circuit which includes said. primary Winding. and said master switch, a, secondary circuit,v in which said electric ignition elementsaidsolenoid and said secondary winding are disposed in series with each other, said transformer being operative when energized to energize said. electric ignition element and said solenoid,.means operative tov break, said' secondary circuit, andde-energize said electric ignitionv element and' said. solenoid after said' pilot burner has. been ignited by said electric, ignition element, and clock. actuated' time control'mecha'- nism operative to close and open said master switch at predetermined set times.

12. In. an automaticV ignition and controlv apfparatus. of' the character described, the combination of a main burner, a pilot burner operative to ignite said main burner; an electric ignition element operative to ignite said pilot burner, a

conduit throughwhich gaseous fuell is suppliedto f said main burner, a manually operable main control valve by which the supply of' fuel teI said main burner' is'primarily controlled, a safetyconltrol valve mechanism interposed* in said conduit between said main control valveand said main burner, a secondary conduit extending between said safety' control4 valveV mechanism andi said pilot burner through which gaseous fuel is sup.- plied to said pilot burner, said safety control valve mechanismL being operative to controlfthe supply of fuel tosaid' main burner after said main control valve has been opened,- a solenoid by which said safety control valve mechanismY is set in condition tosupplyfuel vto said pilotburner and saidv main burner, an electromagnet associ-- ated with said safety control valvev mechanism and operative when energizedy to maintain said safety controlvalvemechanism in said Setcondi.- tion a thermocouple adaptedto be movedinto and. out of positiony to= be heated by said .pilot ltion of said transformer, a primary circuit which includes said primary windingand said master switch, a. secondary circuit in which said electric ignition element said solenoid and said secondary vvindingv are disposed in series with each other, said transformerr being `operativeV when energized to Venergizev said electric ignition element and said solenoid, means operative to break said secondaryl circuit and de-energize said electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element, andclock actuated time control mechanism operative to close and open said master switch at predeterminedset times, said means comprising a normally closed switch in said secondary circuit and a thermostatic element adapted to be heated bysaid pilot burner and operative when heated to open said. normally closed switch.

13.5In an automatic ignition and control apparatus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseousl fuel is supplied to said main burner, a manually operable main *kcontrol valve by which the supply of fuel to said mainburner is primarily controlledja safety `control valve mechanism interposed in said conduitfbetween said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuelris supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been opened, a solenoid by which said safety control Valve mechanism is set in-condition -to supply fuel to said pilot burner and said main burner, an electromagnet associated Ywith said safety control valve mechanism and operative when energized to maintain said safety control valve-mechanism in said set condi-v tio'nQa thermocouple, means by which said pilot burner and said thermocouple are mounted for relative movementinto and out of heat exchanging relationshipawith respect to each other, an

v electric .circuit between said Vthermocouple and said electromagnet through which said electromagnetjisl energized bysaid thermocouple when heated, a solenoid-transformer'having a primary winding and a secondary winding, a master switch .operative when closed to effect energization of said solenoid-transformer, a primary circuit which includes said primary winding and said master switch, a secondary circuit in which said electric ignition element, said solenoid and-said secondary winding are disposed in series with each other, said solenoid-transformer being operative when energized to effect heat exchanging relationship between said thermocouple and said pilot Aburner and to energize said electric ignition y elementand said solenoid, and means operative to vbreak said secondary circuit and de-energize f said electric ignition'element and said solenoid Vafter said pilot burner has been ignited by said electric ignition element.

14. Inlan 'automatic ignition and control ap- .paratus of the character described, the combination of a main burner,

said main burner, a manually operable main control valve by which the supply of fuel vto, said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control-Valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operative Vwhen energized to maintain said safety control valve mechanism in said set condition, a thermocouple operative when heated to energize said electromagnet, means by which said thermocouple and said pilot burner are mounted for relative movement into and out of heat exchanging relationship with respect to each other, means rendered operative by the opening of said main control valve' to eect heat exchanging relationship between said pilot burner and said thermocouple, a transformer having a primary winding and a secondary winding, a master switch operative when closed to effect energization of said transformer, a primary circuit which includes said primary winding and said master switch, a secondary circuit in which said electric ignition element said solenoid and said secondary winding are disposed in series with each other, said transformer being operative when energized to energize said electric ignition element and said solenoid, and means operative to break said secondary circuit and de-energize said'electric ignition element and said solenoid after said pilotI burner has been ignited by said electric ignition.

element.

15. In an automatic ignition and control appa-- ratus of the character described, the combina-l tion of a main burner, a pilot burner operative:

to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated With said safety control valve mechanism and operative when energized to maintain said safety a pilot burner operative to 'r ignite said main burner, an electric ignition ele-I ment operative to ignite said pilot burner, a con-- duit through which'gaseous fuel is supplied to;

Yconduit through which gaseous to. said-mainv burner, a manually operablexmain control valve by which Vmain burner is' primarily and. a. secondary winding,

operative. ,upon the .opening of said main .control valve to effect simultaneously yheat .exchanging relationship. between .said pilot burner andsad thermocouple, a. transformerqhavihg a. primary winding and a secondary winding, aV master switch operativewhen iclosed to effect; energizetion .of said transformer, a primary-.circuit which includes. said. primary windingand said rmaster switch, asecondary .circuit in which .saideleotric ignition elementv said .solenoid ,andsaid secondary winding are disposed in series; ywith eaclfifothery said transformer being .operative when .energized to .energize said electric ignition element and .said solenoid, and means operativeto breakzsaidisec.- ondary'oircuit and de-energize said electric ignition element and said burner has been ignited yby said eleotric'ignition element.

16... In .an automatic ignition .and control apparatus ofthe characterfdescribed, thecombinaf tionl of a main burner, apilotburner operative to .ignite said main burner, an electric ignition element operative. -tov ignite said .pilot burneiya -fuel issupplied the supply offfuel toV said controlled, a. safety 4.control valve mechanism interposed in said lconduit between said" main control valve. andsaid main burner, asecondary conduit yextending.; between said safety ,controlvalve.mechanism; andsad pilot burner kthrough which gaseous fuel issupplied to said pilot burner, said safety control. valve mechanism being, operative tol control. the1fsupplyof fuel to said main :burner after vsaid main control valve 'has been opened,. ai solenoidby -whichsaid safety-control valve mechanism is seti in condition-to. supply' fuel to. said pilot burner. and said main burner,4 an Velectromagnetr associated with said safety control valve mechanism and. operative when. energizedrto. maintainsaid safety control valve mechanism in said set condition, a thermocouple, means by which7 saidk pilot'burner and said thermocoupleare mounted for relative movement into and out of. heat exchangingrelationship. with respect. to each othen: an electric circuit between said thermocouple and. said electromagnet. through which said'v electromagnet is energized by said thermocouple when heated;` a solenoid-transformer having aprim--aryI winding amaster switchoperatilve when closed tot effect energization of said solenoidtransformer-,zar primary circuit which includes said primary windingand said master switch, a Asecondary circuit lwhich said electric ignition element said solenoidand said secondary windingA are-disposed in series with` each-other, said' solenoid-trans'former` being operative Lwhen energized to; effect heat exchanging relationship between said thermocouple and said pilotburner and. to "energize-*said electric ignitionelement and saidl solenoid, means operativetobreak said secondary circuit and de-energfize saidelectric ignition element and said'solenoidafter saidpilot burner has beenv ignited by said electricignition element, and clock actuated time-control mechanismoperative to close and open said' master switch at 'predetermined set -times.

ll.V lnl an automatic ignition and controlappara-tus of the character described, theoombination of a main burner, a pilot-'fbu-rr-ier operative toy ignitesaid main burnenan electric ignition element-operative to `ignite said pilot burner, a conduit through which gaseous fuel is supplied to'said main burner, a manually operable main solenoid vafter -s-aid pilotlle() said safety control valve mechanism isset 1n conving relationship with respect. to each other, aicam control valve .by which the supply of fuel tosaid main burner is vprimarily controlled, a safety con- .trol valvel mechansm interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuelto said main burner after said main control valve has been opened, a solenoid byzwhich said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple operative when-heated to energize said electromagnet, means by which saidthermocouple and said pilot burner are mounted for relative movement into and out of heatv exchanging relationship with respect to each other, means rendered operative by the opening of said main control valve to effect heat exchanging relationship between said pilot burner and said thermocouple, a transformer having a primary winding and a secondary Winding, a master switch operative when closed to effect energization of said transformer, a primary circuit which includes said primary Winding and said master switch, a secondary circuit in which said electric ignition element said solenoid and said secondary winding are disposed in series with each other, said transformer being operative when energized to energize said electric ignition element and said solenoid, and means operative to break said sccondary circuit andY (ie-energize said electric. ignition element and said solenoid afterv said pilot burner yhas been ignited by said electric vignition element, and clock actuated time control mechanism operative to close and open 1 said master switch at predetermined set times.

18. In an automatic ignition andcontrol apparatus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through whichl gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed n. said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to controlthe supplyof fuel to said .mainburner after said. main control valve has been opened, a solenoid by which dition to supply `fuel to said pilot burner and said main burner,Y an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, ya thermocouple operative when heated to energize said electromagnet, means by which said thermocouple and said pilot burner are mounted for relative movement into and out of. heat exchangassiociatcdvzith said main .control valve and .oper- .ative .upon the opening '.of'said main control valve to simultaneously effect heat exchangingv relationship-between saidl pilot burner and said-1 therignition element, said solenoid and said secondary .winding are disposed in series with each other, said transformer being operativel when energized to energize said electric ignition element and said solenoid, means operative to break said secondary circuit and cle-energize said electric ignition ele ment and saidsolenoid after said pilot burner has been ignited by saidelectric ignition element, and

`cloclractuated time control mechanism operative -to close and open said master switch at predetermined set times.

19. In an automatic ignitionl and control apparatus of the character describ-ed, the combination of 'a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit thorugh which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control ,valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control Valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple, means by which said pilot burner and said thermocouple are mounted for relative movement into and out of heat exchanging relationship with respect to each other, an electric circuit between said thermocouple and said electromagnet through which said electromagnet is energized by said thermocouple when heated, a solenoid-transformer having a primary winding and a secondary winding, a master switch operative when closed to effect energization of said solenoid-transformer, aprimary circuit which includes said primary winding and, said master switch, a secondary circuit in which said electric ignition element, said solenoid and said secondary winding are disposed in series with each other, said solenoid-transformer being operative when energized to effect `heatexclianging relationship between said thermocouple and said pilot burner and to energize said electric ignition element and said solenoid,'means operative to break said secondary circuit and d'e-energize said electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element, and clock actuated time control mechanism operative to close and open said master switch at predetermined set times, said means comprising a normally closed switch in said secondary circuit and a thermostatic element adapted to be heated by said pilot burner and operative when heated to open said normally closed switch.

20. In an automatic ignition andcontrol apt paratus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a

Yconduit through which gaseous fuel is supplied to said main burner, a manually operable main control valve by'which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism 'interposed in said conduit between said main control valve and said main burner, a secondary'conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel is suppleid to saidpilot burner, said safety control valve .mechanism being operative to control the supply voffuel to said main burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an Velectromagnet associated Vswitch operative when closed .supply of fuel to said main with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple operative when heated to energizey said electromagnet, means by which said thermocouple and said pilot burner are mounted for relative movement into and out of heat exchanging relationship with respect to each other, means rendered operative by the opening of said main control valve to effect heat exchanging relationship between said pilot burner and said thermocouple, a'transformer having a primary winding and a secondary`v winding, a master to effect energization of said transformer, a primary circuit which includes said primary winding and said masterv -ondary winding are disposedin series with each other, said transformer being operative when energized to energize'said electric ignition element and said solenoid, means operative to break said secondary circuit and de-energize said electric ignition element and 'said solenoid after said pilot burner has been ignited by said electric ignition element, and clock actuated time control mechanism operative to close and open said master switch at predetermined set times, said means comprising a normally closed switch in said secondary circuit and a thermostatic element adapted to be heated by said pilot burner and operative when heated to open said normally closed switch. l

21. In an automatic ignition and control apparatus of the character tion of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseous fuel is supplied to said main burnera manually operable main control valve by which the supply of fuel'to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to control the burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operativewhen energized to maintain said safety control valve mechanism in said set condition, a thermocouple operative when heated to energize said electromagnet, means by which described, the combinasacaste sai'di thermocouple and .saidpilot `burner are' mounted :for relative movement into andl out of heat exchanging relationship with respect to each other, a camfa'ssociated with said mainl control valve' and operative upon the opening of said-.main control .valveto simultaneously effect heat exchanging relationship between rsaid pilot burner and Vsaid thermocouple, a transformer having a primary. Windingan'd a secondary .winding,-A afmaster` switch operative when closed to effectenergization of said transformer, a ,pris mary circuitvvliich includes said primary wind# ingl and said-master switch, a secondary circuit in which said Aelectric ignition element 'said'.sole noid 'and -saidse'condary Vlvs'zinding are disposed ifi-series with eachv litl1er,saidv transformer? lbeing operative when energized vto energize said 'electric ignition; element `'and said solenoid, means operative to break said 'secondary' circuit and de'- energize said electr-ic igriiition element vand y'said solenoid aftersaid pilot burner has been ignited by said electric ignitionelement, and clock ae'-A tuated 'time control mech'anisrnVV operativeto' close and open said master switch at predetermined setl times, saidrmeans co prising a normally closed switchA iii said secondary circuit and' a thermostatic element adapted tol be heated by said pilot burner and operative when heated to open saidnorm'ally closed switch.

22.'I'n an automatic ignition and'control apparatus of the character described, thev cornbination of a main bur-rier, a pilot burner opA` erative to ignite said.V main burner, an electric ignition element operative to ignite said pilot burner, a conduit Ythrough whicl'igaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control valve mechanism and said pilot burner through, which gaseous fuel is supplied to said pilot burner. said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple operative when heated to energize said electromagnet, means by which said pilot burner is mounted for movement into and out of heat exchanging relationship with said thermocouple, a solenoidtransformer having a primary Winding and a secondary winding, a master switch operative when closed to effect energization of said solenoid-transformer, a primary circuit which includes said primary winding and said master switch, a secondary circuit in which said electric ignition element said solenoid and said secondary winding are disposed in series with each other. said solenoid-transformer being operative when energized to move said pilot burner into position to heat said thermocouple and to energize said electric ignition element and said solenoid, and means operative to break said secondary circuit and rie-energize said electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element.

1231i: Inf an automatic ignition :and .controlai-t.

paratusrof the' character described', thel combina tion` ofl a 'main burner, 'aY pilot burner 'operative' to ignite saidwmain burnenffanelectric ignition.

element operative to ignite' said pilot burner,a conduit through which gaseous fuel is'-:.si'iprfnliedv to said .main burner, a manually operable-'main control valve by 'which the 4supp'lysof ,fuelE tozsai'd main .burne-r'is primarilycontrcl-led, a safety control:l valve mechanism interposed .in said .con-1 duit between said main control valve' and fsai'df' main burner, `a secondary conduit extending b'etween said safety contrcltvalve mechanisiand gaseous fueli :is:v

sai-d i .pilot burner through which supplied to 'said pilot burner, said safety` control' valve mechanism' being operative to control .the supply Iof fuel tosaid main burner 'after said main control valve has beenop`ened-,til-solenoid by. which Vsaid-safety 'control valve mechani'smi is set Ain' condition to 'supply fuel tosaid 'pilot burner' and said main burner, anrel'ectromagnet asso#v ciated with said' safety control valveV mechanism and operativewhen energized to maintain 'said safety control valve me" lianisi'n`I in sai'd set cendre tion, ar thermoeoupie operative when heated-ltd energize said electromagnet, rfeans by which'saifd pilot burner is mounted for movement intofand outk of hea-t exchanging relationship y'with 'said thermocouple, means `rendered operative bythe opening ofy said'fmainl control valvey to :move: said'- p'ilot i burner f into position to'l heat-r saidJ thermos" couple; a transformer having' primary .winding and a secondary winding', a master switch opera tive vvv-hen closed' toeffect energizationf of 'said' i transformer; aprimary circuit which inclu-des said-v primary winding and said master switch, a secondary circuit in which said electric ignition element said solenoid and said secondary winding are disposed in series with each other, said transformer being operative when energized to energize said electric ignition element and said solenoid, and means operative to break said secondary circuit and de-energize said electric ignition element and said solenoid after said pilot burner has been ignited by said electric ignition element.

24. In an automatic ignition and control apparatus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseous fuel is supplied to said main burner, a manually operablemain control valve by which the supply of fuel to said main burner is primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between saidy safety control valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been opened, a solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, a solenoid switch operative when closed to effect energization of said solenoid, a relay operative when energized to close said solenoid switch, an electromagnet associated with said safety control valve mechanism and Aoperative when energized to maintain said safety control valve mechanism in said set condition, a thermocouple operative when heated to energize said electromagnet, means by which said pilot burner is mounted for movement into andv out 27 of heat exchanging relationship with said thermocouple, a solenoid-transformer having a primary winding and a secondary winding, a master switch operative when closed to effect energization' of said solenoid-transformer, a primary circuit which includes said primary winding and said master switch, a secondary circuit in which said electric ignition elementsaid relay and said sec- Y ondary winding are disposed in series with each said solenoid-transformer being operative other, when energized to move said pilot burner into position to heat said thermocouple and to energize said electric ignition element and said relay, and means operative to break said secondary circuit and thereby effect de-energization of said electric ignition element said relay and said solenoid after said pilot burner has been ignited by said electric ignition element.

25. In an automatic ignition and control apparatus of the character described, the combination of a main burner, a pilot burner operative to ignite said main burner, an electric ignition element operative to ignite said pilot burner, a conduit through which gaseous fuel is supplied to said main burner, a manually operable main control valve by which the supply of fuel to said main burneris primarily controlled, a safety control valve mechanism interposed in said conduit between said main control valve and said main burner, a secondary conduit extending between said safety control Valve mechanism and said pilot burner through which gaseous fuel is supplied to said pilot burner, said safety control valve mechanism being operative to control the supply of fuel to said main burner after said main control valve has been,openeda solenoid by which said safety control valve mechanism is set in condition to supply fuel to said pilot burner and said main burner, a solenoid switch operative when closed to eiect energization of said solenoid, a relay operative when energized to close said solenoid switch, an electromagnet associated with said safety control valve mechanism and operative when energized to maintain 'said safety control valve mechanism in said set condition, a thermocouple operative when heated to energize said electromagnet, means by which'said pilot burner is mounted for movement into and out of heat exchanging relationship with said thermocouple, means rendered operative by the opening of said main control valve to move said pilot burner into position to heat said thermocouple, a transformer having a primary winding and a secondary winding, a master switch operative when closed to eifect energization of said transformer, a primary circuit which includes said master switch and said primary winding, a sec-V ondary circuit in which said electric ignition element said relay and said secondary winding are disposed in series with each other, said transformer being operative when energized to energize said electric ignition element and said relay, and means operative to break said secondary circuit and thereby eifect de-energization of said electric ignition element said relay and said solenoid after said pilot burner has been ignited by said electric ignition element. Y

RICHARD H. JORDAN.

No references cited.