Appliance for toasting a product

• US 5,692,432 A
• Filed: 12/04/1996
• Issued: 12/02/1997
• Est. Priority Date: 12/06/1995
• Status: Expired due to Term

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Hazan, Jean-Pierre, Gourrier, Serge, Nagel, Jean-Louis
• Primary Examiner(s): Simone, Timothy F.
• Application Number:
  US08/767,100
• Time in Patent Office: 363 Days
• Field of Search: 99/326-334, 99/385, 99/389-393, 219/411-413, 219/345, 219/482, 219/490-493, 219/501, 219/514, 219/518, 219/521
• US Class Current: 99/328
• CPC Class Codes: A47J 37/0842 with electronic timers
• CPC Class Codes: A47J 37/085 with means for sensing the bread condition

Abstract

An appliance (5) for toasting a product (10) comprises detection means (12) for detecting variations of a toasting condition of the product during toasting and for allowing a user to adjust the toasting result as desired. The appliance comprises a temperature sensor (13) which measures the temperature of the product. Timing means (14) are started when a predetermined temperature (Td) is reached. The timing means (14) are stopped when either another predetermined temperature (Tf) is reached or when a predetermined period has elapsed. The appliance is also capable of controlling a process of defrosting of the product prior to toasting of said product.

Claims

1. An appliance (5) for toasting a product (10), comprising:

heating means (17),

control means (11) for controlling the heating means,

timing means (14) to provide time control of the control means,

detection means (12) for detecting variations of a toasting condition of the product during toasting and for supplying at least one control signal which activates the timing means when at least one toasting condition threshold is reached, characterized in that the detection means (12) comprise a temperature sensor (13) which measures a temperature of the product, the detection means comprising a first comparison means (27d) for supplying a first control signal (Sd) which starts the timing means when the temperature of the product is higher than a predetermined temperature (Td) which defines a first toasting condition threshold.

2. An appliance as claimed in claim 1, characterized in that the detection means comprise a second comparison means (27f) for supplying a second control signal (Sf) when the temperature of the product reaches a second predetermined temperature (Tf) which defines a second toasting condition threshold, the timing means being responsive to the first control signal to supply a heating-characteristic change signal (Ca) to the control means and being responsive to the second control signal (Sf) to supply a turn-off signal (Cf) to said control means in order to turn off the heating means.

3. An appliance as claimed in claim 1, characterized in that the timing means (14) comprise a counter (19), triggered by the first control signal (Sd), which counter measures a time control period, the timing means supplying a turn-off signal (Cf) to the control means (11) when the time control period has reached a predetermined length defining the end of toasting.

4. An appliance as claimed in claim 1, characterized in that the predetermined temperature defining the first toasting condition threshold is slightly higher than 100°

C.

5. An appliance as claimed in claim 2, characterized in that the predetermined temperature defining the second toasting condition threshold lies in a range of temperatures from approximately 180°

C. to 200°

C.

6. An appliance as claimed in claim 3, characterized in that the timing means comprise setting means (18) enabling a user to set the predetermined time-control period.

7. An appliance as claimed in claim 1, characterized in that the timing means are responsive to the first control signal to supply a heating-characteristic change signal to the control means.

8. An appliance as claimed in claim 1, characterized in that the detection means comprise a third comparison means (27c) for supplying a third control signal (Sc) having two states so as to control a process of defrosting the product, the timing means being such that they are started by the first state when the temperature of the product is lower than 0°

C. and ate stopped by the second state when the temperature of the product is over 0°

C.

9. An appliance as claimed in claim 1, characterized in that the detection means comprise a third comparison means (27c) for supplying a third control signal (Sc) when the temperature of the product is lower than 0°

C., the timing means being such that they are started by the third control signal and are stopped after a predetermined period.

10. An appliance as claimed in claim 1, characterized in that the temperature sensor is a sensor which without mechanical contact measures infrared radiation emitted by the product.

11. An appliance as claimed in claim 10, characterized in that the detection means (12) comprise a fourth comparison means (27z) for determining the temperature of the product by detecting an equilibrium in the fluxes exchanged between the temperature sensor (13) and the product (10).