Abstract: Sensor and reference wires are directly exposed to the airflow past a vehicle. The wires are electrically conductive, and each has a resistance varying with its temperature. A continuous fixed voltage is passed through the reference wire. A short pulse of greater constant voltage is passed through the sensor wire, the voltage of sufficient magnitude to cause the rapid heating of the sensor wire during the pulse. The resultant rate of heat of the sensor wire, and its final temperature at the end of the pulse, is determined by whether ice or water is on the sensor wire. Circuitry is provided to generate an ice present signal when the difference in current flow during the pulse through the sensor wire and through the reference wire is of such magnitude and sign as to indicate that ice was in contact with the sensor wire. Due to water's heat of fusion, the effect of ice on the sensor wire is readily distinguished from the effect of water.

Abstract: A microprocessor for oven control has a keyboard for data and instruction entry and a display for displaying desired data, including the oven duty cycle. The microprocessor incorporates a random access memory for storing data entered from the keyboard and also incorporates a read-only memory which controls the operation of the microprocessor for its dedicated purpose.

Abstract: In a system in which temperature control of a heated region is critical, assurance means of fail-safe nature are provided to guard against improper temperature. An example wherein temperature is critical is: the artificial ventilation of an unconcious patient's lungs by periodically inspired heated gas under pressure. The assurance means includes dual thermometers which sense the actual temperature in the heated region. The actual temperature is compared with the desired temperature to control an electric heater, which, when energized, increase the temperature of the heated region. Furthermore, the temperatures, as sensed by the two thermometers, are compared with each other. If the difference exceeds a predetermined limit, an alarm is given and the heating system is shut down.

Abstract: A remote control device for controlling the operation of a conventional domestic water heater (18) used singularly or in conjunction with a solar heating system. The control device comprises a remote control head (10), which has an indicator (12) for conveying the status of the water heater (18) and the temperature of the water contained therein and a multi-positional manual switch (14) for selecting the mode of operation of the water heater (18) and a remote controlled heater switch (16), electrically connected to the remote control head (10), which controls power to the water heater (18) in response to signals from the remote control head (10). Therefore, the operation of the water heater can be controlled according to the needs of the user.

Abstract: An apparatus for warming blood and other parenteral fluids as they are infused through a disposable flow system includes a pair of heating elements which heat the blood as it passes through a warming bag provided in the flow system. The heating elements are recurringly switched on and off with a duty cycle dependent on both the temperature of the blood at the output of the warming bag and the temperature differential between the output and input of the bag to maintain the blood at a predetermined temperature independent of flow rate. A digital display and monitoring circuit provides a highly accurate digital indication of blood temperature and interrupts the application of power to the heating elements in the event the temperature exceeds a predetermined maximum level.

Abstract: A cooking utensil comprises a matrix type keyboard operable for generating cooking program sequences for controlling energization of a heat source. A plurality of key switches are disposed within the matrix keyboard in which an abscissa represents temperature values and an ordinate represents time periods both of which are information for the cooking program sequences. Each of the plurality of key switches is operable for directing the cooking of a kind of a specific foodstuff and for reading out the associated cooking program sequences according to which the heat source is energized to produce the specific foodstuff from starting materials therefor. In a specific form, the cooking utensil can be a combination of a microwave oven and one or more other heat-source apparatus.

Abstract: A microwave oven comprises a digital control circuit for controlling microwave generation, and a multi-digit digital display unit for displaying a cooking condition. A determination system is associated with a door switch for developing a display control signal when a cook start switch is actuated before an oven door is tightly closed. In response to the display control signal, an alarm display, for example, "DOOR" is provided on the multi-digit digital display unit. The microwave oven further comprises a food temperature sensor probe for sensing a temperature of foodstuff being cooked. The multi-digit digital display unit provides another alarm display, for example, "PROBE" if the cook start switch is actuated under the condition where the food temperature sensor probe is not placed in its operative condition even though the food temperature control mode of operation is selected.

Abstract: A device for heating blood for transfusion is disclosed which has two vertically disposed opposed electrical heating plates which engage the opposite faces of a flat bag of flexible plastic material delimitating a fluid path therethrough which has a width progressively increasing from a lower inlet pipe for connection to a blood supply to an elongated single rectilinear main portion of uniform width and progressively decreasing from the elongated main portion toward an upper outlet pipe for connection to injection means. A flow restricting means is disposed therein on an intermediate level between the inlet pipe and the main portion of the fluid path to restrict the travel of fluid introduced by the inlet pipe and produce a substantially homogeneous flow all across the main portion of the fluid path. The heating plates include heat radiating fins or corrugations to reduce thermal inertia as the rate of blood flow changes.

Abstract: An induction heating system (40) is provided and includes a plurality of induction heating coils (118). Touch control pads (50, 52, 70, and 72) are provided together with circuitry (80) for generating energization control signals. Circuitry (112 and 116) is provided for electrically energizing the induction heating coils (118). An electronic digital processor (82) is responsive to the energization control signals for generating energization signals for actuating and controlling the energization circuitry (112 and 116) to thereby vary the energization of the plurality of induction heating coils (118). Circuitry (150 and 152) is provided for maintaining touch control pads (50, 52, 70 and 72) operable when an operator is in contact with a pan disposed adjacent the plurality of induction heating coils (118).

Abstract: The microwave oven is provided with a main control circuit including an input mechanism of an information regarding a cooking time, a heat output level, foodstuff temperature, and the like, the main control circuit controlling the cooking operation in accordance with the predetermined operating condition represented by the input information and a magnetron energized by the output of the main control circuit.

Abstract: A system is disclosed for indicating when a flow heater used for vaporization of water and heated by PTC resistors as heating elements therein must be decalcified. Within the flow heater a PTC resistor element is located at a water entry and also at a water exit region. A main PTC heater element is also provided between the entry and exit elements. Separate power supply lines are run to the exit and entry heating elements and an electronic circuit is provided which determines when a difference in current flow in the exit heating element compared to the entry heating element exceeds a given value indicative of the need for decalcification. The circuit connects with an indicator which is triggered when decalcification is required.

Abstract: A helicopter deicing control system (10) is provided for selectively distributing D.C. electrical power to a plurality of deicing segments (80, 90) on main and tail rotor blades with only two slip-ring assemblies (60 and 61, 62 and 63) for each rotor drive shaft. A power distribution controller (20) receives electrical power from the helicopter's onboard, fixed electrical power system and provides an output signal including power and control D.C. electrical signals of opposite polarities. A distributor (70) receives the output signal from controller (20) and increments a rotary switch (74) upon receipt of a D.C. electrical control signal, and distributes power to the main rotor deicing segment (90) connected to the rotary switch (74) contact then engaged upon the receipt of a D.C. electrical power signal so as to sequentially deliver D.C. electrical power to the desired main rotor deicing segment.

Abstract: Fluid level detection means utilizing a thermally conductive element in the general shape of a cone, in one embodiment, in direct contact with fluid whose level is to be detected. A portion of the element, excluding the apex, is directly heated. A thermal sensor is bonded to the apex. When the fluid depletes such that the apex is exposed to air, the temperature in the immediate vicinity of the apex rises to a new point of equilibrium. The sensor converts this elevated temperature into a signal recognized by electronic circuitry as a flow fluid level. This signal may subsequently be used to provide visual or audible alarm.

Abstract: A temperature controller for use with a fryer of the type comprising a vat containing cooking oil and heater, such as a gas burner or electrical heating element, for heating cooking oil comprises a temperature probe for sensing the temperature of the cooking oil, a temperature selector switch producing a signal corresponding to the selected temperature for the cooking oil and also producing a signal corresponding to a normal temperature approximately 25.degree. below the selected temperature. A heat demand comparator produces a heat demand signal when the temperature of the cooking oil is below the selected temperature. A normal temperature comparator compares the temperature of the cooking oil with the normal temperature and provides a signal when the cooking oil is in the normal temperature range, and a cooking gate inhibits this signal if cooking is taking place in the fryer. A heating element control oscillator provides pulses.

Abstract: A plurality of ON-OFF switch type operating keys are connected through respective "AND" gates to an encoder which delivers coded signals as predetermined by the operated keys to a micro-computer where a cooking program is instituted. A switch connected to the control inputs of the "AND" gates is closed to disable the outputs from the operated keys. Alternatively the keys may be arranged in a matrix and connected to an encoder. The keys are scanned with scan signals applied to the matrix from the micro-computer through the normally closed contact of a switch. The switch may be opened to disable the outputs from the operated keys. A cooking range is controlled in accordance with the cooking program.

Abstract: Ready light circuit is provided which comprises a simple third switch blade added to the standard thermostat two-blade switch in an electric iron. The invention involves the improvement of mounting the third blade on one of the other blades of the two-blade switch.

Abstract: A power control system is disclosed for controlling the power output of a resistive heater element in response to operator selected power level settings by varying the rate at which a power pulse of constant duration is applied to the element. The system includes circuitry for generating a control signal representing a selected power output for the element, circuitry for identifying recurring patterns of a binary counter, the patterns recurring at different rates, and a logic arrangement for uniquely associating each of the patterns with a selected power setting. The binary counter and the power pulse control are synchronized with the power supply to trigger a power switching device at or near zero crossovers of the supply.

Abstract: A control panel including digital input means is provided in a microwave oven for introducing desired information related to a cooking time period, a cooking mode or a mean output level of a magnetron, and a temperature to be maintained. The information introduced from the control panel is stored in a digital storage means, of which output signals are applied to a digital control circuit for controlling operation of the magnetron. A temperature sensing means is provided in the microwave oven for detecting a temperature of food being cooked. A detection output of the temperature sensing means is introduced into the digital control circuit, which compares the detection output with the temperature information stored in the digital storage means for controlling operation of the magnetron. The digital input means include a defrost switch for automatically programming intermittent defrost cooking.

Abstract: A control device adapted to control cooking time and power of an electric cooking device. By depressing entry keys on a control panel a desired cooking time data and power level setting data are entered in first and second shift registers respectively. Next when a cooking start key is depressed the electric cooking device starts its operation at a power corresponding to the power level setting data and the down count operation of the time data in the first shift register is started. When the time data in the first shift register becomes zero due to the down count operation the cooking device stops its operation. The data in the first and second shift registers are displayed by digital indicators. The time data in the first shift register is detected whether or not it has an erroneous digit or digits and any detected erroneous digit or digits are blanked or flashed on the digital indicators.

Abstract: A control circuit is disclosed suitable for use with a toaster or other food browning device which utilizes a radiant energy source to brown food. A light sensitive variable resistor, or photocell, is optically coupled to light reflected from the food being browned in the device. A voltage generated by a voltage divider including the light sensitive resistor therein is compared with a preselectable voltage generated by a second voltage divider to determine whether the heat source should be turned on or off. Suitable solid state control circuitry is provided to ensure that a start-up delay is provided at the beginning of each browning cycle and to reset the circuit for future operation when the desired browning of the food is achieved.

Abstract: A cooking appliance with touch pad controls is protected against inadvertent turning of a cooking facility such as a hob ring to full power by a spillage on an UP pad (increase temperature). A control circuit turns the facility off if the UP pad signals that it is touched for longer than say 5-7 seconds. Similarly a warning can be given if a DOWN pad remains touched too long, to prevent inadvertent turning off of a facility.

Abstract: A power control method and system for a cooking appliance using a high inrush current element in which the instantaneous glow from the heater element is utilized to inform the operator of appliance turn-on. The power control includes a logic arrangement for detecting the transition of the appliance from an OFF condition to a selected one of a plurality of power level settings. Prior to energizing the heating element at the selected power level, the control energizes the element for a preselected transient time at a level to produce a visible glow.

Abstract: Calcification sufficient to cause material impairment of heat transfer is indicated in a water heater in an electric appliance, such as a coffee maker. The water heater has a first and a second temperature-dependent switch thermally coupled thereto. The first switch serves as a final interrupter or temperature control. The switching temperature of the second switch is below that of the first one in the range of temperatures which occur in the water heating operation if excessive calcification is present. A time delay member after a predetermined time actuates an indicating signal. The time delay member is in operation when only the second temperature-dependent switch is in responded condition. The time delay member ceases operation and returns to its original state when both temperature-dependent switches are in the responded state or the original condition.

Abstract: A control indicator optic arrangement and indicating method for a refrigerator having an access door, an interior light bulb that is illuminated when the door is open, and antisweat heaters that are energized by an on-off switch. Included is a movable switch member that energizes the antisweat heaters and a shade member slidable in unison with the switch member and having a cutout area. A light transmitting rod from the interior light bulb to the shade member is arranged such that when the switch is in a first position to energize the antisweat heaters the transmitting rod is in alignment with the cutout area of the shade member and in the second position when the antisweat heaters are de-energized it is out of alignment with the cutout area. Thus, with this arrangement there is a visual indicator to alert the refrigerator user to the fact that the antisweat heaters are energized.

Abstract: A cooking surface serving as a cook top or stove for use in cooking food can be constructed utilizing a glass support member. In the disclosed structure an induction heating coil is mounted on the undersurface of the support member. An electrically powered graphic display is also mounted on the undersurface of the support member so that this display is visible from above the support member. The support member also carries the parts of two different touch controls which are responsive to the presence of a part of a hand of an individual so as to provide an output signal. What may be referred to as an "electronic package" for controlling the operation of the coil and of the graphic display in synchronism with one another is connected to the parts of the touch controls mounted on the support member and is connected to both the coil and the graphic display. The touch controls can be individually operated so as to either increase or decrease the amount of current supplied to the coil.

Abstract: Ready light circuit is provided comprising a simple third switch blade added to standard thermostat two-blade switch in electric iron. Light is activated when bimetallic element of switch drives third blade into engagement with other blade as iron reaches set temperature. Light stays illuminated as long as main contacts of standard-type blades remain open. When thermostat calls for more heat, light in circuit which is across main contacts, is shorted out.

Abstract: A control system having a control unit provided with a single thermostatically operated control device for operatively interconnecting a heater to a source of energy when the output temperature effect of the heater is below a predetermined setting of a selector of the control unit and to disconnect the heater from the source of energy when the output temperature effect of the heater is above the predetermined setting of the selector, the single thermostatically operated control device also operating an indicating light to indicate that the output temperature effect of the heater is still above a certain value only when the selector of the control unit is in an "off" setting thereof. The selector of the control unit also operates a pilot light to indicate that the selector is set in an "on" setting thereof.

Abstract: This specification discloses an induction heating cook-top including touch controls for controlling the operation thereof. The cook-top includes a source of direct current voltage and a first heating unit having a first induction heating coil connected to the direct current voltage source and an SCR having an anode coupled to the coil and a cathode connected to AC circuit ground. The system further includes a second heating unit including a second induction heating coil and a second SCR connected between the second coil and the source of direct current voltage. The second SCR includes a cathode connected to AC circuit ground. Circuitry is provided to apply gating pulses to both of the SCRs in order to control the heating of the induction heating coils. A touch control system is provided to control the heating level of the induction heating coils and includes heat control touch pads for increasing or decreasing the energization of the coils.

Abstract: An electrolytic water heater is provided which has general utility for heating and boiling water, or other electrically conductive solutions, by passing an electric current through the solution. The heater includes a housing composed of electrically nonconductive material, whose interior is divided by a common wall into two separate chambers. An opening is provided in the common wall of restricted dimensions which may be in the form of a slot in the upper edge of the wall, and the solution in the two chambers extends into the opening to complete an electrical path through the solution in the two chambers. Two electrodes are respectively mounted in the chambers in contact with the solution in the two chambers. An electric voltage is applied across the electrodes to produce a current flow through the solution, so as to heat the solution in the opening in the common wall to the boiling point, without producing cavitation in the solution in the vicinity of the electrodes.

Abstract: An electronic display having a plurality of digit positions is employed in conjunction with a keyboard to enter data for controlling the operation of a microwave oven. Each digit position of the display is individually responsive to a corresponding key of the keyboard, whereby actuating such key causes its display digit to run repetitively through a numerical sequence without carrying over into other display digits. Upon stopping actuation of such key, its display digit stops on the numeral displayed at that moment. Other digits of the display may be similarly loaded with data, whereby the fully loaded display represents a control parameter, such as cooking time. Actuating a start key permits the oven to carry out a cooking program in accordance with the data thus entered into the display.

Abstract: The specification discloses a touch control panel particularly adapted for use with an induction heating cook-top. The panel includes a plate of insulating material such as glass having outer and inner planar surfaces separated by a predetermined thickness. Discrete conductive film areas such as tin oxide are formed on the outer planar surface of the plate. A printed circuit board includes a plurality of pairs of spaced apart conductive regions formed of copper or the like thereon. Springs are provided to urge the printed circuit board continually against the inner surface of the plate, such that the pairs of conductive regions are disposed in a predetermined symmetrical orientation below the film areas on the outer surface of the plate. Circuitry is connected on the printed circuit board and is coupled to the conductive regions in order to generate electrical signals in response to contact with the film area by a finger of the operator.

Abstract: A household coffee machine of the type including a thermostatically controlled electric flow heater coupled to cold water supply and having a hot water outflow is provided with a calcification indicator connected electrically in parallel with the heater thermostat. The calcification indicator includes an indicator, such as a buzzer or glow lamp, in series with a thermal cut-out switch which is disposed in thermally responsive association with the line coupling the cold water supply to the flow heater. The series connected thermal cut-out switch and indicator have a high impedance in order to insure that the calcification indicator does not respond when the heater thermostat is closed.

Abstract: A housing containing a buzzer and mercury switch is mounted on the shaft of the drain lever for a heated tank, for example in a dishwasher. If the heating unit is still turned on when the drain valve is opened, the buzzer sounds to warn the operator that operation of the heating unit without water in the tank will damage the machine.

Abstract: A control circuit for a drier wherein a buzzer is provided for signalling termination of the normal drying cycle or operation of the drier in an anti-wrinkle cycle. When utilized to signal the end of a normal cycle, the buzzer provides a short time duration signal and when utilized to indicate the operation of the drier in the anti-wrinkle cycle, the buzzer provides a longer duration signal at periodic intervals during the cycle. Control of the buzzer is by a single cycle switch connected in cooperation with a timed switch for controlling operation of the drier drive motor, and a centrifugal switch also provided for controlling operation of the drier drive motor. The cycle switch may be a double throw switch and may have an associated pulser mechanism for effecting the desired intermittent operation of the buzzer for indicating the anti-wrinkle cycle.

Abstract: An electric oven which has a plurality of heating positions for controllably heating foodstuff thereon includes temperature selection means for locally and remotely selecting the heating temperature, and timing means for locally and remotely setting the heating duration of each of the heating positions, respectively. Display means are provided for selectively showing the remaining heating duration locally and remotely following setting of the timing means for the heating duration of the cooking positions, respectively, and switching means are employed for selectively turning the heating positions on and off in response to the respective preset heating durations.

Abstract: Safety back-up and alarm circuit for loads such as electrical heaters and the like comprising a back-up substitute load for the primary load, e.g., an electric heater, switching circuits responsive to outputs from the primary and back-up loads, and which automatically replace the primary load with the back-up load upon failure of the primary load, said switching circuits including a circuit which reliably reads the output from the primary load and distinguishes failure of the primary load from mere non-load -- including impedance in the primary load circuit, a primary alarm element, e.g. a lamp, bell, or buzzer responsive through said switching circuits to a failure of the primary load and an energizing of the back-up load and a secondary alarm element, e.g. a bell or buzzer responsive to a failure of said back-up element.

Abstract: A control system having a thermostatically operated control device for operatively interconnecting a heater to a source of energy when the output effect of the heater is below a predetermined setting of the control device and to disconnect the heater from the source of energy when the output effect of the heater is above the predetermined setting of the control device, the control device operating an indicating light to indicate that the output effect of the heater is still above a certain value when the control means is in an "off" setting thereof.

Abstract: A method and a device for causing blood coagulation are disclosed. Both are especially well suited for use in endoscopy. A support is provided with an end portion on which an electrically operated thermo-element is located which receives electrical current to be heated to a level at which it has a coagulation-causing temperature. A control arrangement maintains the temperature steady when the level is reached. A visual indicator visually shows the heating of the thermo-element to the aforementioned level and an audible indicator audibly indicates the heating of the thermo-element by producing a sound which increases in intensity until the aforementioned temperature level is reached and which thereafter continues at a constant intensity while the temperature is maintained at the aforementioned level.

Abstract: The invention relates to a safety control shut-off device for the heating element of a cooking stove. In one embodiment of this safety device, a burner plate of the stove is provided with several declining U-shaped grooves for collecting any spillage or overflow of water from the cooking operations. Water drops collected in the declining grooves are led through a discharge outlet, at the lowest portion of the grooves, and into a water drop detector located beneath the outlet, to complete an electrical circuit, which in turn will actuate and sound an alarm and will also actuate means for disconnecting the fuel source of the plate burner.

Abstract: A flexible heating cable having a cold lead section and a heating section, in which a thermostat is disposed in the cold wires of the cold lead section and a light and a switch are disposed in a flexible translucent plastic pouch remotely located from the two sections and are connected to the wires adjacent the thermostat so that the unit can be tested at a position remote from the heating cable installation. The heating section is preferably provided with a socket on the end opposite the cold lead section to permit the coupling therewith of one or more heating section modules, and the switch is preferably operated by depressing the side walls of the remotely located pouch.

Abstract: A temperature control device in which electric power to be supplied to a heating element is controlled correspondingly to pulse intervals applied to a switch circuit with the pulse intervals adapted to vary according to the temperature of the portion to be heated by the heating element, which temperature control device is further provided with a sensor for detecting the pulse intervals when the temperature of the portion to be heated has reached a predetermined level with the signal from the sensor being utilized as the signal for the completion of warming-up of the portion to be heated.

Abstract: An infinite switch for controlling the temperature of a stove heating element is provided with a visual indicator energized when the heating element is energized. The switch has terminals connected to an electrical power source and includes a housing, a cover with a central aperture, and a rotatable, hollow spindle extending through the aperture and into the housing. A cam mounted on the spindle interacts with two sets of switch contact elements. One set of contact elements is movable by the cam from an open to a closed position thereby connecting the power source with the second set of contact elements. The second set of switch contact elements are adjusted by the cam and are operated by a thermomotive element in heat transfer relation with a thermal heating device. The thermomotive element cycles the second set of contacts between open and closed positions alternately to energize and deenergize the heating element. The proportion of on time during each cycle is determined by the position of the cam.

Abstract: An electrical circuit for use in a contact lens care unit for disinfecting lenses includes two thermostats one of which is manually set to electrically energize a heating device for disinfecting lenses and an indicator element for providing visible representation of the operational state of the unit. The second of which thermostats automatically energizes to provide a parallel electrical energizing path to the indicator for a period of time after the first thermostat automatically deenergizes the heating device. The indicator is thereby continually energized throughout a complete contact lens care cycle to provide prominent representation of the operational state of the unit.

Abstract: An electric percolator having a liquid containing section formed from an assembly of glass and other materials fixed together by means of a locking collar. The lid of the percolator is held in place by means of a quick-release latching mechanism which prevents the lid from being disengaged by the lifting motion normally used to open a lid and instead requires a twisting motion which rapidly releases the lid. Simplified electrical circuitry in the percolator utilizes a single lamp that indicates both the "Brewing" and the "Keep Warm" modes of percolator operation.A method is also set forth for assembling a composite apparatus, having a glass component which does not require threading, strapping or gluing of the glass component.

Abstract: A control system for a microwave oven includes a programmable digital logic control circuit which enables a user to program information into the digital logic control circuit. The digital logic control circuit of the present invention allows a user to program information into the control, relating to the amount of time the magnetron tube is to be energized. The control also allows the user to select the power level or duty factor at which the magnetron is energized from three different levels, thus providing a choice to the user as to whether the magnetron is to be operated in a defrost mode, a slow cook mode or a cook mode. The control of the present invention allows the oven to be operated in a single stage manner whereby the microwave oven is operated in the defrost, slow cook or cook modes for the amount of time programmed into the control by the user.

Abstract: An apparatus activates an alarm for a kiln operator when the heat and temperature provided by a kiln reach a predetermined level thereby activating a kiln shut-off weight and switch. The kiln shut-off weight rotates to engage a rod coupled to a switching means for activating an alarm.

Abstract: The invention comprises apparatus and methods for controlling and monitoring most of the energy systems used by man. An energy level to be maintained is predetermined and electronically established as a time interval. Sensing means are exposed to the actual energy level for influencing the parameter value of the sensing means in accordance with the sensed energy level. The parameter value is converted to a digital pulse train with the time period between pulses being proportional to the parameter value being sensed. A reference or standard time base is generated, from which a measure of time for the period is obtained. This measure of time is compared against the time interval to determine if energy need be applied to reach the predetermined energy level, if alarm is required and to display a digital or numerical representation of the actual energy level.

Abstract: A hand held hair drier includes a cylindrical heater sleeve longitudinally coupled to a main body provided with a handle extending normally therefrom. The handle includes first and second windows of different, readily distinguishable colors positioned at a location above the normal gripping portion thereof. A pair of switches arranged to be operated by a two position push button located in the handle and arranged to selectively energize an electric heater in the heater sleeve and/or an electric motor driven fan in the main body through first and second circuit each provided with a signal lamp arranged adjacent a respective one of the different colored windows. When the push button is activated to the first position one switch is closed and the fan is energized to blow unheated air and one of the lamps is lit to illuminate a window. When the push button is activated to the second position both the heater and fan are energized so that heated air is delivered and both lamps are lit to illuminate both windows.

Abstract: A domestic range including a touch control and display panel and digital control logic for energizing power circuits controlling the various range heater elements in response to a program entered by the user by touching certain areas of the panel. The control logic also controls the displays located behind the panel to provide feedback to the user of the program selected.

Abstract: A control system having a thermostatically operated control device for operatively interconnecting a heater to a source of energy when the output effect of the heater is below a predetermined setting of the control device and to disconnect the heater from the source of energy when the output effect of the heater is above the predetermined setting of the control device, the control device operating an indicating light to indicate that the output effect of the heater is still above a certain value when the control means is in an "off" setting thereof.