US2318195A - Ignition system - Google Patents

Description

May 4, 1943. P. E. CATE IGNITION SYSTEM Filed Nov. 1, 1939 W W a a mg a w Q E 7L mum Q. m F W m 255: a? flw T mm W 0 WIN" @325; Hill. .1 .w i WIN WN\L NWN Patented May 4, 1943 v i UNIT D STATES PATENT OFFICE IGNITION SYSTEM PaulE. Cate, Knoxville, Tenn, assignor to The Fulton Sylphon Company, \Knoxville, Team, a corporation of Delaware Application November 1, 1939; Serial No. 302,409 1 Claim. (01. 175-115) This invention relates to ignition systems and vantages by using a resistance having a high temmore particularly to ignition systems providing a perature coeflicient of resistivity in a relay circuit high tension spark for ignition purposes. Even and subjecting it to the flame oi the burner to more particularly this invention relates to high block the current passing through the relay when tension spark ignition systems suitable for use 5 the burner is ignited and thereby open the spark with domestic gas ovens, top burners, heaters or circuit. any other device burning i'uel capable of ignition In the accompanying drawing an illustrative by high tension sparks. I embodiment of the novel ignition system of the The present invention provides an ignition syspresent invention is shown as applied to the usual which automatically ignites the burner by a gas burner but it is to be expressly understood high tension spark when the fuel is turned on that this embodiment is shown for the purposes and which will reignite the burner when the of illustration only, that the novel ignition system flame is extinguished by reason of temporary of the present invention is suitable for use with failure of the fuel supply or for any other reason. any device burning fuel that can be ignited by a The present invention likewise provides visuei high tension spark and that this illustrative emmeans for indicating when the ignition spark bodiment is not to be construed as a limitation is on. t 1 v on the present invention reference being had to It is accordingly an object oi the present inthe appended claim to determine the scope of vention to provide a novelhigh tension spark the present invention. 1 I ignition system which will automatically ignite In the accomp y ng aw g I0 is any suitable the burner when the fuel is turned on. 7 source or supply of electricity the positive side 01 Another objector the present invention is to which s connected by n el c ri al c nduit or provide a novel high tension spark ignition syswire II to a suitable terminal strip II on the gas .tem which will automatically reignite the bur valve (not shown). From terminal strip II a wire when the flame is extinguished by reason 01 the It leads to a suitable relay it. From relay It a temporary failure of the fuel supply or for any wire It leads to one side of a suitable resistance other reason. 7 16 having a suitable high temperature coemcient Another object oi the present invention is to of resistivity. Resistance I6 is designed to be provide a, nove1 high tension rk gnition sysheated by the flame irom burner II A wire ll tern which will visually indicate when the spark 80 leads from the other side of. resistance II and is is on. connected at I9 with a wire" leading to termi- Another obiect oi. the present invention is to 1 s p A w r II nn cts wire 20 with one provide a novei high tension spark ign ti n sysside 01' a suitable switch 22 here shown schematitem which will use a minimum amount 01' current lly and designed to be closed by the o ning or during ignition periods of the burner. 5 the gas valve in any suitable way. Wire 23 leads A still further object oi the present invention from the other side of switch 22 to terminal strip i t provide a, novel high tension spark ignition l2 and continues as wire :4 to the negative side system which is compact, durable, cheap to manof the source of electrical supply ill.

uiacture, easy to install on existing installations m h third Bide f r y 5 wire 25 leads and one which has no moving parts to wear and 40 to one side oi the primary windings oi a suitable get out oi' adlustment. high tension coil 26, the other side of the p Heretoiore various high tension spark ignition w ings being nnected at i! with wire 20 by systems have been proposed for igniting burners wi m h secondary w n ng of high in which variou m an; ha e b provided for tension coil 28 a wire 28 leads to a suitable visual opening the spark circuit after the burner has signal 29, u h s anecn. glow tube. Sisnal I9 is been ignited. Various bimetallic elements and connected y i Ill with a suitable sp rk B p thermostats subjected to the flame oi the burner l l arrang d i n b rner II, the other side oi have been used to open the spark circuit after rk sap ii being onn ct d ywire a: to wire a. ignition and in other cases the conductivity oi With theili strativeembodiment or the novel the flame oi the burner-has been used to operate so i nition system, 01' the present invention set up relays to open the spark'eirouit. Thes system as above described, to ignite the burner the valve have proved expensive to install and diihcult to pply n 8 8 fn't burner is en hereby ke in adjustment Th pre nt invent on overclosing switch 22. Closing switch 22 allows ourcomes these difllculties while satisfying the above I rent to flow from the source of electrical sup l mentioned objects and possessing the desired adll through wir s II and to relay From primary windings of high tension coil 26.

relay H current then flows through wire l5 and resistance l6, resistance |6 being cold and hence offering the minimum resistance to the passage of current. From resistance IS the circuit is completed through wires I8, 20, 2|, switch 22, and wires 23 and 24 to the source of electrical supply l0. Current flowing through this resistance circuit operates relay l4 and current then passes through wire 25 to the primary windings of high tension coil 26, the primary winding circuit being completed through wires 21, 20, 2|, switch 22,

and wires 23 and 24 to the source of -electrical supply l0. Current flowing through the primary windings of high tension coil 28 induces a high tension current in the secondary windings of coil 26 this high tension current passing by wire 28 to visual indicator 29 causing it to glow, and from there passes by wire 30 to the spark gap 3 where a high tension spark is created and burner I1 is ignited, the spark gap circuit being completed by wire 32 connecting with wire 25.

When burner ignites, resistance It is rapidly heated and due to its high temperature coefficient of resistivity its resistance rapidlybuilds up to a point where the current fiowing in the resistance circuit is reduced below that necessary to operate relay l4. Relay M then opens the circuit to the tension current is then no longer induced in the spark gap circuit, visual indicator 29 ceases to glowand the high tension spark across gap 3| terminates.

High' resistance coil being heat of the burner name when the gas is ignited If for any reason the flame at burner I! should be extinguished while the gas supply valve is open and switch 22 closed resistance lfi rapidly cools and due to its high temperaturecoeificient of resistivity its resistance rapidly drops allowing'a rapidly increasing current to flow in the resistance circuit. This current rapidly increases to the point necessary to operate relay I4. Relay M then closes the circuit to the primary windings of high tension coil 26 and current flows therethrough inducing a high tension current in the secondary windings of coil26 causing visual indicator 29 to glow. and creating a-high tension spark at gap 3| to reignite burner II. When burner I1 is reignited resistance |6 is reheated and relay |4 opened to terminate the spark at gap 3| as described above.

It will now be apparent that the present invention provides a novel ignition system suitable for use with any type of devic using fuel capable of ignition by a high tension spark which will automatically ignite the device when fuel is supplied thereto, which will reignite the device when the flame is extinguished and fuel still supplied thereto and which will provide a visual indication indicating when the spark is on. It is also apparent that this novel system uses the minimum amount of current during ignition periods of the device, is compact, durable, cheap, easy to install on existing installations, and one which has no moving parts to get out of adjustment.

To those skilled in the art changes in or modifications of the above described illustrative embodiment of the present invention will now be suggested without departing from the inventive concept of the invention and reference should be had to the appended claim to determine the scope of the present invention.

What is claimed is:

In an ignition system for a gas burner, gas ignition means located in position to ignite gas flow from said burner, a source of electricity, a relay for connecting said gas ignition means with said source of current to control the flow of current through said gas ignition means, and means for blocking the flow of current through said relay to effect the opening of the circuit through said gas ignition means when said burner is ignited including a, resistance coil always connected in series with the coil of said relay, said subjected directly to. the

and responsive only to the presence or absence of the burner flame, said resistance coil determining the current flow to said relay to determine the operation of said relay in controlling the flow of current to said gas ignition means, said resistance having a high temperature coefficient of resistivity to substantially block the flow of current through said relay, to open the circuit through said gas ignition means and thereby discontinue. operation pf the same, when said resistance is heated by the existence of a gas flame at said burner, and said resistance coil reestablishing the flow of current through said relay and efiecting the reactuation of said gas ignition means automatically when said resistance coil is cooled upon' extinguishment of the burner flame. 7

PAUL E. CATE.

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