Euro-Pro Exhibit 1012
`Euro-Pro v. Acorne
`Page 1 of 8
`IPR2014-00182
`Page 1 of 8
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`Dec. 28, 1937.
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`A. T. SMITH ET AL
`ELECTRIC COOKING UTENSIL
`
`2,103,560
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`Filed May 4, 1935
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`2 Sheets—Sheet 2
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`J6
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`[Z1/67720719-'
`JZUQ T5772.12‘/Z,
`f/erberé Jfloom
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`Patented Dec. 28, 1937
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`2,103,550
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`UNITED STATES
`
`PATENT OFFICE
`2.io:,5ob
`ELECTRIC COOKING UTENSIL -
`Alva '1‘. Smith and Herbert
`1. Moon, Milwaukee.
`Win.
`assignors
`to National Enameling 1
`Stamping
`Company. Milwaukee, Win. a corpo-
`ration of New Jersey
`
`Applicatlon May 4, 1935, Serial No. 19,796
`(Cl. 219-20)
`acclaim.
`This invention appertains to cooking appli-
`ances, and more particularly to an improved elec-
`tric cooking utensil of the casserole or roasting
`type.
`One or the primary objects of our invention
`is the provision of an electric cooker having a
`high and low heating range, with novel means
`for automatically cutting out a resistance coil for
`high heat when a predetermined temperature is
`reached within the cooker, whereby the cooking
`can continue at the temperature desired, and
`without further attention on the part of the
`operator.
`,
`_ In electric cooking vessels or this character
`it is generally customary to preheat the vessel
`to a desired high temperature by the use of re-
`sistance heating elements before-the food to be
`cooked is placed within the vessel, and when the
`vessel reaches the desired temperature, to place
`the food therein and cook under a low or slow
`heat. The housewife has nodefinite means of
`knowing when the desired temperature is reached,
`and it is generally customary to preheat the ves-
`sel ior a certain length of time, at which time it
`is presumed that the desired high temperature
`has been reached.’ Obviously, this method is un-
`_ certain and also requires accurate timing on the
`part or the housewife.
`It is,
`therefore, an important object of our
`invention to provide apilot light on the cooking
`vessel in circuit with the high heat resistance
`element. When the desired temperature is
`reached, the high resistance element is automat-
`ically cut out by the thermostat. This causes the
`pilot light to go out, thus indicating to the house-
`wife that the vessel is ready to receive the food.
`As the thermostat operates in accordance with
`the temperature within the cooking vessel, the
`high heat resistance element is cut in and out,
`thus causing the pilot light to flash on and then
`go out. This intermittent flashing indicates that
`the thermostat is holding the vessel to the de-
`sired temperature.
`'
`Another salient object of our invention is the
`provision of a thermostat incorporated with the
`cooker for automatically cutting out
`the high
`heat resistance element when the desired tem-
`perature is reached, and to provide a pilot light
`in circuit with the thermostat and indicating
`when said high temperature has been reached.
`The present
`invention includes the idea of
`providing novel means for incorporating the pilot
`light and the thermostat in the cooking appli-
`ance, whereby a low voltage lamp can be uti-
`lized, and whereby the wattage is so distributed
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`among the several heating coils that considerable
`loadis removed from the thermostat thus reduc-
`ing sparking of contact points so that long life
`will be obtained for the thermostat.
`A further object of our invention is the pro-
`vision 0! novel means for incorporating the pilot
`light or lamp directly within the knob utilized
`for setting the thermostat, so that the lamp will
`be protected and placed at a convenient point for
`’ observation by the housewife.
`Another object within the purview of the pres-
`ent invention is to provide novel means for as-
`sembling the lamp socket and the knob, whereby
`the socket and bulb will be held stationary at all
`times irrespective of the turning of the knob, so
`that complicated brushes or other movable con-
`tacts ior the lamp socket will be dispensed with.
`A further object of our invention is the pro-
`vision of novel means tor connecting the ther-
`mostat within the cooker, whereby the heat will
`be instantly conducted to the thermostat from
`thecooking vessel, and whereby the thermostat
`can be easily and quickly removed from the vessel
`for repair, and disconnected from the control
`knob.
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`The invention also comprehends the provision
`of a plurality of heating coils for the cooker,
`with a thermostat for cutting out only one coil
`when a desired high temperature is reached,
`whereby to reduce the work of the thermostat and
`to leave the other coils in use, which coils func-
`tion to eliminate radio interference by dissipat-
`ing the inductive eifect created when the circuit
`is broken through the high heating coil by the
`thermostat.
`_
`A still further object of our invention is to pro-
`vide a novel thermostat and pilot light arrange-
`ment for electric cookers of the above character,
`which will be durable and eiflcient in use, one that
`will be simple and easy to manufacture, and one
`which can be placed upon the market and incor-
`porated with a cooker at a comparatively low
`cost.
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`other objects, features, capabilities and advan-
`tages are comprehended by the invention, as will
`later appear and as are inherently possessed
`thereby.
`Referring to the drawings:
`Figure l is a fragmentary vertical cross-scc-
`ticnal view through an electric cooking appli-
`ance made in accordance with the present inven-
`tion and taken in a plane represented by line
`l—l of Figure 2 of the drawings;
`Figure 2 is a horizontal view in cross-section
`of the apparatus shownin Figure 1 of the draw-
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`the finger 40 by means of an electric conducting
`strip 54.
`'
`The fingers 38'and 40 and the thermostatic
`element 48 are preferably held within a suitable
`casing 58. This casing 56 includes a body 58
`provided with a flange 69 to which is removably
`secured cap 60, by suitable clips 62. The binding
`posts 30 and 38 extend through the body of the
`casing and are insulated from the casing by the
`insulating block 64 disposed outwardly of
`the
`casing 56 and the insulating block 50 adjacent
`thereto on the inside thereof.
`In order to quickly conduct heat from the inner
`vessel 2 to the thermostat, a supporting bracket
`or clip 66 formed of aluminum, or other heat
`conducting material,
`is rigidly held in direct
`contact with the side of vessel 2 by being -placed
`under insulating strip II before coils I0 and I2
`are wound thereon, and this bracket or clip has
`formed integral therewith the inwardly directed
`arm 68, which extends under the bottom wall of
`the vessel 2. A single screw ‘ID is utilized for
`connecting the casing 56 with the bracket, and
`the casing is disposed adjacent to the bottom
`wall of the inner vessel 2 so that the same also
`will receive heat directly from said vessel, yet
`spaced therefrom sufliciently to prevent warping
`thereof.
`We form the thermostat adjustable so that the
`cooker can be set at any preferred temperature,
`and consequently one side wall of the body of
`the casing 56 has rigidly connected therewith a
`nut 12, through which extends a. threaded ad-
`Justing stem or shaft 14. The inner end of the
`threaded adjusting stem is provided with an
`insulating point 16 for engaging the resilient
`leaf or finger 40.
`By adjusting the threaded shaft or stem 14,
`the fingers 40 and 38 can be moved so that the
`finger 38 will be disposed nearer to or further
`’ from the thermostatic element 48. This allows
`the breaking of the circuit by the element 48 a
`different temperatures.
`,
`'
`The outer end of the adjusting shaft ‘I4 is pro-
`vided with a non-circular shank 18 and a re.-
`dially extending stop pin 80. Arranged in the
`path of the stop pin 80 is a rigid stop arm 82
`held in place by the nut ‘I2, and the stop pin
`and arm limit the turning movement of the shaft
`in both directions.
`Novel means is provided for actuating the
`shaft ‘I4 from the exterior of the cooker. This
`means embodies a manipulating knob 84, which
`can be formed from “bakelite” or similar ma-
`terial. The central portion of the knob 84 is
`provided with a transparent or
`translucent
`“bull’s eye” 86, so that rays of light emanat-
`ing from the low voltage bulb I8 can be readily
`seen by the operator.
`2
`~
`Particular stress is laid on the novel means
`of forming and assembling the lamp socket and
`the turning knob, as by our means the lamp and
`its socket are held stationary during the turning
`of the knob.
`In accordance with our invention, a
`rigid bracket 88 is provided, and this bracket is
`fitted on the inside of the shell ,4 in engagement
`with the side wall 6 thereof and adjacent to the
`thermostat IS. The bracket 88 is formed with a
`central opening, which aligns with an opening 98
`in the side wall 6 of the shell, and the side wall
`6 adjacent
`the opening 90 is crimped about
`the bracket 88 for rigidly holding the same in
`position.
`_
`is a
`Rotatably mounted within the bracket
`sleeve 92, to which may be connected, by means
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`ngs and taken in the planes represented by the
`line 2—2 thereof ;
`_
`Figure 3 is a fragmentary vertical cross-sec-
`tlonal view taken in the plane indicated by line
`3-3 of Figure 2 of the drawings;
`Figure 4 is a view similar to Figure 3 showing
`a different setting for the thermostat control
`means;
`Figures 5 and 6 are fragmentary views in ele-
`vation of the knob for the thermostat control
`means and showing the settings, thereof for the
`positions of the control means in Figures 3
`4, respectively; and
`'
`Figure 7 shows a diagrammatic view of a wiring
`diagram incorporating the various electrical ele-
`ments of the circuit for the cooking appliance
`shown in Figure 1 of the drawings.
`Referring now more in detail to the drawings.
`an electric cooking appliance made in accordance
`with the. present invention is shown as compris-
`ing an inner vessel 2, and an outer spaced shell
`or housing 4. The outer shell or housing 4 can
`include a. side wall 6 and a base 8. The inner
`vessel 2 is preferably heat insulated from the
`shell 4 by the use of suitable packing, such as
`mineral wool (not shown). The inner vessel 2
`may or may not receive removable cooking pots
`V and pans.
`The inner vessel 2 is heated by independent
`side heating elements or coils in and I2, and a
`bottom heating coil I4 enclosed within the insu-
`lating strips II and I3, respectively. These coils
`are indicated in the wiring diagrams, and the
`coil
`III and the bottom coil
`I4 are in constant
`series with one another, while the coil I2 is auto-
`matically cut in and out by means of the ther-
`mostat I6, which will be later described in de-
`tail. The coil I2 is only used for high heat. and
`is preferably of the 800 watt type, while the coils
`I0 and I4, when combined, are preferably of the
`200 watt type. A pilot light I8 is utilized for in-
`dicating when a desired high temperature has
`been reached in the cooker.
`_
`By referring to Figure '7, it will be noted that
`the coils I0 and II are connected together at
`the terminal 20, and that their opposite ends 22
`and 24, respectively, lead to the suitable contact
`posts or prongs 26 and 28, whereby the cooker
`can be connected with a conventional house cir-
`cuit. One end of the high heating coil
`I2 is
`connected to the coils I0 and I4 by means of ,
`the common terminal 20. The other _end is
`carried to the contact post 30 of the thermostat
`IS. A part of this end indicated by 32 is so pro-
`portioned in length that the proper voltage drop
`is obtained on the lamp I8 which is shunted
`around it. A conductor wire 34 from contact
`post 36 of the thermostat IE to post 26 completes
`this part of the circuit.
`The thermostat I6 is of the bimetallic type and
`includes resilient electric conducting fingers 38
`and 40 having inturned terminals carrying con-
`tact points 42 and 44, respectively.
`The resilient finger 38 may be provided with
`a struck-in bight portion 46 for facing relation
`to the bimetallic thermostatic member 48. The
`inner ends of .the resilient fingers 38 and 40 and
`the thermostatic element 48 are held in place
`by insulating blocks 50. Terminal posts 30 and
`36 clamp the insulating blocks and the fingers
`and thermostatic element in place, and the posts
`extend through insulating sleeves 52. One post
`36 is electrically connected to the finger 38, and
`the other post 30 is electrically connected to 2
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`of a_ set screw M or_ the like, the knob 94. Spot
`welded or -otherwise secured to the sleeve 92 is a
`rearwardly directed operating arm 90 having a
`foot 98 provided with a non-circular opening for
`receiving the non-circular shank ‘I9 of the adjust-
`ing shaft 14. A bushing of insulating material
`In is received within the sleeve 92 and rotates
`with said sleeve, and this bushing rotates around
`a lamp socket "I02 for threadedly receiving the
`lamp I8.
`. ’
`The lamp socket I02 includes the usual electric
`conducting shell
`IM and central contact ' I99,
`which is in the natureof a rivet. in that its oppo-—
`site ends are upset for holding the insul_ating
`washers I08 and I I0 and shell III! in place.
`Rigidly_ secured between the insulating wash-
`ers I08 and I III is a supporting bracket I I2, which
`is connected by means of screws III to the main
`bracket 99. This rigidly holds the lamp socket
`in place. Extending between the insulating
`washer Ilfl and insulating bushing IIIII and elec-
`trically connected with the shell
`lot, is a de-
`pending electric conducting bus bar II S, for a
`purpose which will be later set forth. At this
`point, it is to be noted that the supporting brack-
`et II2 has a vertical portion arranged in the path
`of the operating arm 96. This limits the turning
`movement of the operating arm 96 and sleeve 92
`attached thereto, in both directions. The verti-
`cal portion of bracket 96 is in alignment with the
`bus bar IIS and enough wider so that when arm
`H2 is stopped, it does not make electrical con-
`tact with the bus. bar II6. This stop arrange-
`ment is the one which limits the dial I I8 on knob
`84 in its high and low position. The stop ar-
`rangement on the thermostat
`IE is in use only“
`from the time the thermostat is calibrated until
`it is put in place in the roaster.
`In assembling the lamp socket, knob, etc., the
`insulating bushing Hill is placed around the shell
`I04 of the lamp socket, and the bushing with the
`lamp socket is placed within the rotatable sleeve
`92. The sleeve 92 is then placed through the
`opening in the side wall ii of the shell, and the
`bracket
`II2 is rigidly connected by means .of
`screws III with the main bracket 88. Slots can
`be formed in the main bracket 89 for the screws
`II4, whereby the bracket
`IIE can be slid back
`and forth to correctly position the sleeve 92 and
`the lamp socket relative to the knob. A thin
`sheet of mica I20 is interposed between the sup-
`porting bracket II6 and the main bracket 88, so
`as to insulate the bar H6 and keep a wire I22
`aligned with the stop II2. The knob 94 is now
`rigidly connected with the sleeve 92 by meansof
`the set screw 94, it being understood that the
`lamp I8 is threaded into its socket prior to the
`placing of the knob in position.
`As stated, the thermostat I6 is held in place by
`the single screw ‘I0, and during the placing of the
`thermostat in position the‘non—circular end 18
`of the adjusting shaft ‘M is placed within the
`non-circular opening of the adjusting arm 96.
`From the foregoing description, it can be seen
`that the assembling of the thermostat and the
`pilot light socket is an easy one, and that a new
`thermostatic unit
`I6 can be quickly substituted
`for a worn-out one, without the necessity of
`sending the entire roaster back to the factory for
`repair.
`Again referring to Figure 7 in connection with
`9 Figures 1 and 2, it will be noted that the high
`heating coil
`I2 is connected to terminal post 30,
`Vbymeans of the resistance wire 32. This wire 32
`canbe a continuation of coil I 2 or a separate piece
`
`of resistance wire. The terminal post II is con-
`nected to the resilient leaf II by means of the
`connector strip I4. As heretofore stated,
`the
`other end of coil
`I2 is electrically‘ connected
`with the terminal 20. Also electrically connected
`with the terminal post 22 is the short conductor
`wire I22. which is connected with the central
`contact III of the lamp socket. The lamp circuit
`is completed by the lamp socket IN in electrical
`contact with the bus bar II6. To the bus bar
`H8 is attached the wire In which is electrically
`connected to coil I2 at a distance from the post
`30 indicated by thelength 22.
`By this arrangement it is to be noted that the
`low voltage lamp is shunted across the main high
`heat circuit in such a way as to give the proper
`voltage to this low voltage lamp without the use
`of transformers or other auxiliary apparatus.
`By this arrangement we are enabled to use a
`low voltage lamp of the radio panel type, which
`gives long hours of service in contradistinction to
`miniature high voltage lamps placed across the
`entire voltage drop of the appliance.
`As brought out in the objects of the specifica-
`tion, the thermostat unit I9 cuts coil
`I2 only in
`and out of the heating circuit, this coil being
`used for the high heat, and thus when the roaster
`or casserole is in service the coils I9 and I4 are ‘
`constantly in use. This minimizes the work of
`the thermostat unit I6, and during the cutting In
`and out of the coil I2 the coils Ill and II act as
`choke coils and prevent surging of the current,
`which eliminates radio interference. This is
`highly important
`in restricted neighborhoods.
`-The coil I2 being cut across the circuit for the
`coils III and I4 allows the coils III and II to dis-
`sipate the inductive eifect created when the cir-
`cuit is opened and closed by the thermostat to
`. the coil I2.
`From the foregoing description it can be seen
`that we have provided an eflicient electric cook-
`ing device in which it is merely necessary for
`the housewife to set the control knob 84 to the
`desired heat, and to then place the food in the
`cooker when the pilot light goes oil’ or intermit-
`tently flashes, which indicates when the cooker
`is ready to receive the food.
`As previously described, the knob is provided
`with a dial I I8 having graduatlons indicating dif-
`ferent degrees of heat which may be turned into
`any desired position as indicated by the arrow
`I28.
`-
`While we have herein described and upon the
`drawings shown an illustrative embodiment of
`the present invention, it is to be understood that
`the invention is not limited thereto but may com-
`prehend other constructions, arrangements of
`parts, details and features without departing from
`the spirit of the invention.
`We claim:
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`1. In an electric cooking device having a re-
`ceptacle provided with a bottom and a side wall.
`the combination of a low heating circuit includ-
`ing heating elements, one of said elements being
`disposed adjacent the bottom and another of said
`elements being disposed adjacent the side walls
`of said receptacle, said elements being connected
`, in series, a high heating circuit including a heat-
`ing element disposed adjacent one of said walls
`and electrically connected in parallel with one of
`the elements of said low heating circuit, and a
`thermostat for disconnecting the heating element
`of the high heating circuit when a desired tem-
`perature is reached.
`
`2. In an electric cooking device having a re-
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`circuit, said high heating circuit’ being provided
`. with a portion connected to said thermostat com-
`prising a wire producing a low voltage drop, and
`a pilot light shunted across saideportion to indi-
`cate by the flashing thereof that the desired tem-
`perature is being maintained in the cookingvessel.
`'7. In an electric cooking device. the combina-
`tion or an inner receptacle and an outer casing,
`an electric heating circuit for said receptacle, said
`circuit including a thermostat having an adjust-
`able shaft, means rotatably mounted in said outer
`casing for operating said shaft, and means in said
`circuit disposed within said rotatable operating
`means and flxed in relation to said casing for
`indicating exteriorly of said casing operation, of
`said circuit.
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`4 c
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`8. In an electric cooking device, the combina-
`tion of an inner receptacle and an outer casing,
`an electric heating circuit for said receptacle in-
`cluding 9. thermostat provided with an adjustable
`shaft for varying the operation of said circuit,
`means mounted in said outer casing for setting
`said thermostat, said means being readily de-
`tachable coupled to said shaft, and a pilot light
`in said circut within said first-named means for
`indicating the operation or said thermostat.
`9. In anelectric cooking device, the combina-
`tion of an inner receptacle and an outer casing,
`an electric heating’ circuit for said receptacle in-
`cluding a thermostat having means for varying
`the operation of said circuit, means rotatably
`mounted in said outer casing cooperating with
`said flrst-namedmeans for setting said thermo-
`stat, and a pilot light for said circuit mounted
`within said means and non-rotative with respect
`to said outer casing.
`10. In an eletric cooking device, the combina-
`tion of an inner receptacle and an outer casing,
`an electric heating circuit for said receptacle in-
`cluding a thermostat associated with said inner
`receptacle and having means for varying the
`operation of said circuit, 9; bracket of heat con-
`ducting material for readily detachably connect-
`.ing said thermostat to said inner receptacle, and
`means mounted in said outer casing and oper-
`able from the exterior thereof and cooperating
`with said flrst—named means for setting said
`thermostat.
`'
`'
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`11. In an electric cooking device, the combina-
`tion of an inner receptacle and an outer casing.
`an electric heating circuit for said receptacle in-
`cluding a thermostat associated with said inner
`receptacle‘ and having means for varying the
`operation of said circuit, said thermostat having
`a casing of heat conducting material, a bracket
`of heat conducting material connected to said in-
`ner receptacle and to the thermostat for disposing
`said casing in close proximity to said inner re-
`ceptacle to maintain the desired temperature
`thereof, and means mounted in said outer casing
`and operable from the exterior thereof for set-'
`ting said thermostat, said last-named means hav-
`ing means cooperating with said first-named
`means to provide a readily detachable connection
`therebetween.
`12. In an electric cooking device, the combina-
`tion of a casing, a thermostat disposed within
`said casing and being provided with- an adjust’-
`able shaft, means for setting said thermostat in-
`cluding a sleeve rotatably mounted in said casing
`and having an arm coupled to said shaft, a pilot
`light operable in conjunction with said thermo-
`stat and disposed within said sleeve, and a knob
`mounted on said sleeve exteriorly of said casing
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`eptacle provided with a bottom and a side wall,
`the combination of a low heating circuit includ-
`ing heating elements, one of said elements being
`disposed adjacent the bottom and another 01' said
`elements being disposedadjacent the side walls
`of said receptacle, said elements being connected
`in series, a high heating circuit including a heat-
`ing element disposed adjacent the side wall of said
`receptacle and electrically connected in parallel
`with one of the elements of said low heating cir-
`cuit, and a thermostat for disconnecting the heat-
`ing element of the high heating circuit when a
`desired temperature is reached.
`‘
`3. In an electric cooking device, the‘combina-
`tion of a low heating circuit connected to a source
`of electrical energy and including a plurality of.
`heating elements connected in series, a high heat-
`ing circuit including at least one heating element
`electrically connected in parallel with one or more
`but not all of said serially connected heating ele-
`ments of the low heating circuit, and a thermo-
`stat ior disconnecting the heating element of the
`high heating circuit from the low heating cir-
`cuit when a predetermined temperature is
`reached, said low heating circuit serving as a
`choke coil during operation to eliminate radio
`interference upon the cutting in and out of the
`high heating circuit.
`4. In an electric cooking device, the combina-
`tion of a low heating circuit including a plurality
`of heating elements electrically connected in se-
`ries, a high heating circuit including at least one
`heating element electrically connected in parallel
`to one or more but not all of said first-named ele-.
`ments, means automatically disconnecting the
`heating element of the high heating circuit from
`the low heating circuit when a predetermined
`temperature is reached, said low heating circuit
`serving as a choke coil during operation to elimi-
`nate radio interference upon" the cutting in and
`out of the high heating circuit, and a low voltage
`pilot lamp shunted across a portion of said high
`"heating circuit having ‘the desired voltage drop
`for indicating the operation of said means. '
`5. In an electric cooking device, the combina-
`tion of a low heating circuit including a plurality
`of heating elements electrically connected in se-
`‘ries, a high heating circuit ‘including at least one
`heating element electrically connected-in parallel
`to one or more but not all ofsaid flrst-named
`elements, said high heating circuit
`including
`means automatically operating to disconnect the
`heating element of the high heating circuit from
`the low heating circuit when a predetermined
`temperature is reached, said low heating circuit
`serving as a choke coil during operation to elimi-
`nate radio interference upon the cutting in and
`out of the high heating circuit, said high heating
`circuit being provided with a portion comprising
`a wire producing a low voltage drop, and a pilot
`light shunted across said portion for indicating
`the operation of said means.
`.
`‘
`6. In an electric cooking device, the combina-
`tion of a low heating circuit including a plurality
`of heating elements electrically connected in se-
`ries, a high heating circuit including at least one
`heating element electrically connected in parallel
`to one or more but not all of said flrst-named ele-
`ments, said high heating circuit including a ther- -
`mostat for automatically disconnecting the heat-
`ing element thereof from the low heating circuit
`when a predetermined temperature is reached.
`said low heating circuit serving as a choke coil
`during operation to eliminate radio interference
`upon the cutting in and out of the high heating
`
`10
`
`15
`
`20
`
`25
`
`'30
`
`35
`
`45
`
`so,
`
`55
`
`60
`
`65
`
`70
`
`75
`
`

`
`3,108,560
`
`5»
`
`18. In an electric cooking device, the combina-
`tion of a casing, an electric heating circuit in-
`cluding a thermostat disposed within said cas-
`ing and being provided with an adjustable shaft,
`means for setting said thermostat including a
`rotatable sleeve mounted in said casing and hav-
`.'.—..=.g an arm coupled to said shaft, a knob mounted
`on said sleeve exteriorly of said casing for rotation
`thereof, a lamp socket iixed in respect to said
`casing and being electrically connected in said
`heating circuit, and a pilot light mounted within
`said socket and within said sleeve and knob for
`indicating operation of said thermostat exterlorly
`of said casing.
`_
`14. In an electric cooking device, the combi-
`nation of a casing, a thermostat disposed within
`said casing and being provided with an adjust- ‘
`able shaft, means for setting said thermostat in-'
`cluding a sleeve rotatably mounted in said cas-
`ing and having an arm coupled to said shaft, a
`pilot light operable in conjunction with said ther-
`mostat and disposed within said sleeve, a knob
`‘ mounted on said sleeve exteriorly of said casing
`for rotation thereof, and means engageable by
`said arm for hunting rotation of said sleeve.
`15. In an electric cooking device, the combina-
`tion of a casing, an electric heating circuit in-
`cluding a thermostat disposed within said casing
`and being provided with an adjustable shaft.
`means for setting said thermostat including a
`sleeve rotatably mounted in said casing and hav-
`ing an arm coupled to said shaft, a knob mounted
`on said sleeve exteriorly of said casing for rota-
`tion thereof, a lamp socket having a bracket con-
`nected to and insulated from said casing for non-
`rotatively mounting said socket in respect to said
`casing and being electrically connected in said
`heating circuit, a pilot light mounted within said
`socket and within said sleeve and knob for indi-
`cating operation of said thermostat exteriorly of
`said casing, said bracket having a portion en-
`gaged by said arm to limit movement of said
`sleeve.
`16. In an electric cooking device, the combina-
`tion of a casing, an electric heating circuit in-
`cluding a thermostat disposed Within said casing
`. and being provided with an adjustable shaft,
`means for setting said thermostat including a
`sleeve rotatably mounted in said casing and hav-
`ing an arm coupled to said shaft, a knob mounted
`on said sleeve exteriorly of said casing for rotation
`thereof, a bracket fixed to said casing, a lamp
`socket having a bracket connected to and insu-
`lated from said casing for non—rotatably mount-
`ing said socket
`in respect to said casing, said
`socket being electrically connected to said heat-
`ing circuit, said electrical connection including a
`shell and a bus bar connected thereto, a pilot
`light mounted within said shell and within said
`sleeve and knob for indicating operation of said
`thermostat exteriorly of said casing, said second-
`named bracket having a portion aligned with
`said bus bar but wider than the same engaged by
`said arm to limit movement of said sleeve and to
`protect said bus bar.
`17. An electrical circuit comprising a low heat-
`ing circuit connected to. a- source of electrical
`energy and including a heating unit,
`a. high
`heating circuit
`including a heating unit elec-
`trically connected in parallel with a portion only
`of the heating unit of said low heating circuit,
`and a thermostat for automatically connecting
`and disconnecting said high heating circuit and
`said low heating circuit, said low heating circuit
`serving as a choke coil during operation to
`
`10
`
`15
`
`30
`
`65
`
`70
`
`ll
`
`10
`
`15
`
`_
`
`20
`
`eliminate radio interference upon the cutting in
`and out of the high heating circuit.
`18. An‘ electrical circuit comprising a low heat-
`ing circuit connected to a source of electrical en-'
`ergy and including a heating unit. a high heating
`circuit including a heating unit electrically. con-
`nected in parallel with a portion only of the
`heating unit" of said low heating circuit, means
`for connecting and disconnecting said high heat-
`ing circuit and said ‘low heating circuit, when a
`predetermined temperature is reached, said low
`heating circuit serving as a choke coil during
`operation to eliminate radio interference upon
`the cutting in and out of the high heating cir-
`cuit and a low voltage pilot lamp shunted across
`a portion of said high heating circuit having the
`desired voltage drop for indicating the operation
`of said means.
`i
`.
`.
`19. An electrical circuit comprising a low heat-
`ing circuit connected to a source of electrical
`energy and including a heating unit, a high heat-
`ing circuit including a heating unit electrically
`connected in parallel with a portion only of the
`heating unit of said low heating circuit, a ther-
`mostat for automatically connecting and‘dis-
`connecting said high heating circuit and said low
`heating circuit, said low heating circuit serving
`as a choke coil during operation to eliminate
`radio interference upon the cutting in and out
`of the high heating circuit, and a low voltage
`pilot lamp shunted across a portion of said high
`heating circuit having the desired voltage drop
`for indicating the operation of said thermostat.
`20. In an electric cooking device, the combina-
`tion of an inner receptacle and an outer casing,
`an electric heating circuit for said receptacle in-
`cluding a thermostatic unit readily detachably
`mounted in association with said inner recep-
`tacle, said unit including means for adjusting the
`same, and means mounted in said outer casing
`for operation of said adjusting means, and means
`for readily detachably connecting said first and
`second named means.
`21. In an electric cooking device, the combina-
`tion of a casing, an electric heating circuit in-
`cluding a thermostat disposed within said cas-
`ing, means for adjusting said thermostat, means
`for setting said thermostat including a means
`rotatably mounted in said casing and having
`means cooperating with said first-named means
`to provide a readily detachable connection there-
`between, and a lamp soc