Oven cooking monitor for uniformly cooking a plurality of food items requiring different cooking times

• US 4,036,995 A
• Filed: 12/29/1975
• Issued: 07/19/1977
• Est. Priority Date: 12/29/1975
• Status: Expired due to Term

• Current Assignee: Technology Licensing Corporation
• Original Assignee: Food Automation Service Techniques Incorporated
• Inventors: Witt, Allan E., Koether, Bernard G.
• Primary Examiner(s): Jones, Raymond N.
• Assistant Examiner(s): Yoncoskie, R. A.
• Application Number:
  US05/644,875
• Time in Patent Office: 568 Days
• Field of Search: 426/233, 426/243, 426/246, 426/523, 340/233, 340/417, 340/227 R, 340/228 R, 219/412, 219/413, 219/450, 99/342, 99/344, 99/329 R
• US Class Current: 426/233
• CPC Class Codes: F24C 7/08 Arrangement or mounting of control or safety devices
• CPC Class Codes: G01K 2207/06 for preparation purposes
• CPC Class Codes: G05D 23/1909 whose output amplitude can only take two discrete values
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor
• CPC Class Codes: H05B 1/0263 Ovens

Abstract

An oven cooking monitor and method automatically control the cooking, to a selected degree of doneness, of a plurality of food times requiring different cooking times, thereby permitting the food items to be loaded into the oven in random size order and to be removed in the order in which they become done. In restaurant or fast food cooking a number of different roasts of beef of different sizes often are placed in an oven to be cooked to a uniform degree of doneness, or roasts of similar or different size are placed in an oven at different times. Uniform cooking, without overcooking, is achieved through the present invention by providing a separate disconnectable probe for each food item to generate a signal varying with the temperature sensed by each probe. A reference temperature signal is set to correspond to a desired degree of doneness, and the sensed temperature signal and reference temperature signal are compared, yielding an output signal when the sensed and reference temperatures match. When an output signal is generated to indicate that one of the food items has reached the desired degree of doneness, the monitor indicates the particular probe associated with the done food item and automatically switches the oven to a holding temperature substantially curtailing further cooking. The done food item is removed, and its probe is disconnected, whereupon the monitor stops the probe indicator and automatically switches the oven again to its cooking temperature. Cooking then proceeds until the next food item is done. In this fashion, a plurality of food items such as roasts can be cooked without requiring careful supervision, and without exceeding a prescribed degree of doneness, thereby reducing waste. Roasts may be loaded randomly, and removed in the indicated order in which they become done.

Claims

1. An oven cooking monitor for automatically controlling the cooking, to a selected degree of doneness, of a plurality of food items requiring different cooking times, to permit food items to be loaded into an oven randomly and removed in the order in which each food item becomes done, comprising:

a disconnectable probe for each food item, arranged to be inserted into the food item to sense its internal temperature;

means connected to each probe for providing a signal varying with the internal temperature sensed by the probe;

means for setting a reference temperature signal;

means for comparing the temperature sensing signal from a probe with the reference signal and for providing an output signal when the sensed temperature matches the reference temperature;

means connected to the comparison means for receiving an output signal arising from the attainment by any of the probes of the reference temperature and, in response to such an output signal, (a) indicating which probe has sensed the done food item and (b) switching the oven to a holding temperature to curtail further cooking, and, in response to disconnecting of the probe for the done food item, said means (a) stopping indicating of that probe as the one associated with the done food item and (b) switching the oven again to a cooking temperature, whereby cooking of the food items proceeds until the next food item has reached the desired degree of doneness, thereby permitting the different food items to be cooked and stored safely until removal while preventing any overcooking thereof, and indicating the order in which the food items become done and are to be removed.

2. An oven cooking monitor for controlling the cooking of a plurality of food items as claimed in claim 1 wherein the means for indicating which probe has sensed the done food item comprises an indicator light for each probe and means responding to the comparison output signal for flashing the indicator light, said monitor further comprising means for steadily energizing the indicator light when its probe is connected and is sensing a temperature below the reference temperature.

3. An oven cooking monitor for automatically controlling the cooking of a plurality of food items as claimed in claim 1 further comprising a temperature meter for connection to a probe to visually indicate the internal temperature of the food item being sensed by the probe, whereby the internal temperature of each food item may be ascertained during cooking.

4. An oven cooking monitor for controlling the cooking of a plurality of food items as claimed in claim 1 wherein the means for comparing the sensed temperature signal with the reference temperature signal comprises a separate comparator for each probe, and wherein the means for setting a reference temperature signal applies a single reference signal to each comparator.

5. An oven cooking monitor for controlling the cooking of a plurality of food items as claimed in claim 1 further comprising means for setting the oven holding temperature, and means for setting the oven cooking temperature.

6. An oven cooking method for automatically controlling the cooking, to a selected degree of doneness, of a plurality of food items requiring different cooking times, to permit food items to be loaded into the oven in random order and removed in the order in which the food items become done, comprising:

placing food items into an oven,

inserting a temperature-sensing probe into each food item of a type that provides a signal varying with the temperature sensed by the probe, said temperature sensing probe being connected to said oven,

setting a reference temperature signal to correspond to the desired degree of doneness,

using self-actuating comparison means to compare the sensed temperature signal with the reference temperature signal and to provide an output signal when the sensed and reference signals match, to indicate which probe is associated with the done food items, and to switch the oven to a holding temperature curtailing further cooking of the food items,

removing the done food from the oven and disconnecting the probe for the done food item from the oven, and

in response to the disconnecting of the probe associated with the done food item, said comparison means stopping the indication that a food item is done, and switching the oven again to a cooking temperature to resume cooking of the remaining food items,

whereby cooking of the food items proceeds with each food item attaining the desired degree of doneness with overcooking automatically prevented, and with an indication of the order in which the food items become done and are to be removed.

7. An oven cooking method for automatically controlling the cooking of a plurality of food items as claimed in claim 6 further comprising the steps of providing an indicator light in association with each probe, indicating the probe is associated with a done food item by flashing the indicator light, and indicating that a probe is connected and is below the reference temperature by steadily energizing the indicator light.

8. An oven cooking method for automatically controlling the cooking of a plurality of food items as claimed in claim 6 further comprising visually indicating on a meter the temperature sensed by a selected probe.

9. An oven cooking method for automatically controlling the cooking of a plurality of food items as claimed in claim 6 wherein the reference signal setting and comparing steps comprise setting a single reference temperature signal and comparing the signal reference signal with each of the sensed temperature signals provided by the probes.

10. An oven cooking method for automatically controlling the cooking of a plurality of food items as claimed in claim 6 further comprising setting the oven holding temperature, and setting the oven cooking temperature.

11. An oven cooking monitor for automatically controlling the cooking, to a selected degree of doneness, of a plurality of food items requiring different cooking times, to permit food items to be loaded into an oven randomly and removed in the order in which each food item becomes done, comprising:

a probe for each food item arranged to be inserted into the food item to sense its internal temperature;

means connected to each probe for providing a signal varying with the internal temperature sensed by the probe;

means for setting a reference temperature signal;

means for comparing the temperature sensing signal from each probe with the reference temperature signal and for providing an output signal when any sensed temperature matches the reference temperature; and

means connected to the comparison means for receiving an output signal and, in response to such an output signal, indicating that the food item is done and switching the oven to a holding temperature to curtail further cooking, thereby permitting the food items to be cooked and safely stored until removal while preventing any overcooking thereof.

12. An oven cooking monitor as claimed in claim 11 wherein the probes are disconnectable, and wherein the means receiving the comparison output signal, in response to disconnecting of the probe in the done food item, stops indicating that a food item is done and switches the oven again to a cooking temperature.