Toaster oven/broiler with continuously energized indicator

• US 4,874,929 A
• Filed: 11/24/1987
• Issued: 10/17/1989
• Est. Priority Date: 11/24/1987
• Status: Expired due to Fees

• Current Assignee: Hamilton Beach/Proctor-Silex Incorporated (Hamilton Beach Brands Holding Co.)
• Original Assignee: Proctor-Silex Incorporated
• Inventors: Houser, Philip H.
• Primary Examiner(s): PASCHALL, MARK H
• Application Number:
  US07/124,733
• Time in Patent Office: 693 Days
• Field of Search: 219/506, 219/494, 219/497, 219/518, 219/492, 219/490, 219/491, 219/483, 219/486, 99/325, 99/328, 99/331, 99/329 R, 99/329 P, 99/329 RT, 99/339, 99/341, 99/342
• US Class Current: 219/506
• CPC Class Codes: A47J 37/08 Bread-toasters
• CPC Class Codes: F24C 7/087 of electric circuits regulating heat
• CPC Class Codes: G05D 23/275 with sensing element expanding, contracting, or fusing in response to changes of temperature

Abstract

A toaster oven/broiler is provided with a visual indicator which is continuously illuminated when the device is in the toast, oven or broil mode. The indicator is not extinguished when the device is in the oven mode and thermostat switch contacts open to deenergize the heating elements.

Claims

1. A control and indicator circuit for a kitchen appliance operable in a toast mode and an oven mode and having first and second leads for connecting said appliance to a voltage source, said circuit comprising:

a toast mode switch for initiating said toast mode;

heating means connected between said toast mode switch and said second lead whereby said heating means is continuously energized during said toast mode;

thermostatic switch means having contacts connected in parallel with said toast mode switch and in series with said heating means, said thermostatic switch means being responsive to heat generated by said heating means for selectively deenergizing said heating means during said oven mode by opening said contacts to control the temperature in said appliance;

control switch means and an indicator circuit means including indicator means connected in a series circuit between said first and second leads, said control switch means being closed only during said oven mode; and

,

resistor means connected at one side to said toast mode switch, said thermostatic switch means and said heating means and connected at the other side to said series circuit intermediate said control switch means and said indicator means.

2. A control and indicator circuit as claimed in claim 1 wherein said indicator means includes a pilot light continuously energized through said resistor means during said toast mode, said pilot light being continuously energized during said oven mode through said control switch means.

3. A control and indicator circuit as claimed in claim 1 wherein the resistance of said resistor means is considerably greater than the resistance of said heating means whereby said heating means is deenergized during said oven mode when said contacts are open.

4. A control and indicator circuit as claimed in claim 3 wherein said indicator circuit means includes a further resistor connected in series with said pilot light.

5. A control and indicator circuit as claimed in claim 4 wherein said pilot light is a gaseous vapor discharge lamp.

16. A control and indicator circuit as claimed in claim 4 wherein the resistances of said resistor means and said further resistor means are approximately equal.

6. In a kitchen appliance having first and second leads to which a voltage source may be applied, said appliance being operable in at least a first mode and a second mode and including a first series circuit connected between said first and second leads, said first series circuit including heating means and first switch means for closing said series circuit in said first mode, a second series circuit connected between said first and second leads, said second series circuit including said heating means and a thermostatic switch means connected in parallel with said first switch means for intermittently closing said second series circuit when in said second mode, and indicator circuit means including an indicator operable in at least one of said modes to indicate that a voltage is being applied to said heating means, the improvement wherein said indicator circuit means comprises a third series circuit connected in parallel with said heating means, said third series circuit including a resistor connected in parallel with said thermostatic switch means in said second mode, and a fourth series circuit connected between said first and second leads, said fourth series circuit including a further switch means connected at one side to said first lead and at the other side to said third series circuit for energizing said indicator in said second mode whereby said indicator is continuously energized when said appliance is in either said first mode or said second mode.

17. A control and indicator circuit as claimed in claim 6 wherein said third series circuit comprises said resistor and said indicator, said further switch means being connected at said other side between said resistor and said indicator.

18. A control and indicator circuit as claimed in claim 6 wherein said further switch means is connected in series with said thermostatic switch means and said resistor.

19. A control and indicator circuit as claimed in claim 6 wherein said further switch means is connected in series with said resistor, the further switch means and the resistor being connected in parallel with said thermostatic switch means.

7. A control and indicator circuit for a kitchen appliance operable in a toast mode for continuously applying an input voltage to a heating means through a pair of toast switch contacts and operable in an oven mode for intermittently applying the input voltage to said heating means through a pair of oven switch contacts and a pair of thermostatic switch contacts responsive to the temperature in said appliance, said control and indicator circuit comprising:

an indicator,

circuit means connected to said indicator and one of said oven switch contacts for continuously energizing said indicator for as long as said oven switch contacts are closed; and

,

9. A control and indicator circuit as claimed in claim 7 wherein said further circuit means comprises a resistor connected in series with said toast switch contacts and said indicator.

12. A control and indicator circuit as claimed in claim 9 wherein the resistance of said resistor is substantially greater than the resistance of said heating means.

13. A control and indicator circuit as claimed in claim 7 wherein said indicator is a gaseous vapor discharge lamp.

15. The improvement as claimed in claim 13 wherein said indicator means comprises a gaseous vapor dishcarge lamp.

8. further circuit means connected to said indicator and one of said toast switch contacts for continuously energizing said indicator for as long as said toast switch contacts are closed.

10. A control and indicator circuit as claimed in claim 8 wherein said resistor is also connected in parallel with said thermostatic switch contacts.

11. A control and indicator circuit as claimed in claim 8 wherein the resistance of said resistor is substantially greater than the resistance of said heating means.

14. In a kitchen appliance operable in at least a first mode for continuously energizing a heating means and a second mode wherein the heating means is intermittently energized through a thermostatic switch means which opens in response to the temperature within the appliance, the improvement comprising:

an indicator means;

a first circuit for continuously energizing said indicator means in parallel with said heating means during said first mode;

a second circuit for continuously energizing said indicator means in parallel with said intermittently energized heating means during said second mode;

said first circuit including a resistor connected in parallel with the thermostatic switch means, the resistance of said resistor being relatively high compared to the resistance of said heating means to thereby isolate said heating means from said second circuit during said second mode when said thermostatic switch means is open.