Electric toaster with time delay mechanism

• US 5,094,154 A
• Filed: 08/27/1990
• Issued: 03/10/1992
• Est. Priority Date: 08/27/1990
• Status: Expired due to Term

• Current Assignee: Applica Consumer Products Incorporated (Spectrum Brands Holdings, Inc.)
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Nopanen, Esko J.
• Primary Examiner(s): Coe, Philip R.
• Assistant Examiner(s): COOLEY, CHARLES E
• Application Number:
  US07/572,657
• Time in Patent Office: 561 Days
• Field of Search: 99/329 RT, 99/328, 99/329 R, 99/327, 99/334, 99/335, 99/385, 99/389, 219/492, 219/493, 219/510, 219/512, 219/514, 219/491, 219/501, 219/494, 219/519
• US Class Current: 99/328
• CPC Class Codes: A47J 37/0835 with thermal timers

Abstract

An electric toaster includes a housing having at least one heating element mounted therein. A source of electric power is selectively connected to the heating element for energization thereof. A carriage is mounted in the housing for supporting a food product to be toasted and is movable between upper non-toasting and lower toasting positions. An electrically operated latch mechanism holds the carriage in its toasting position. A temperature sensing switch is electrically connected to the latch mechanism for releasing the mechanism and returning the carriage to its non-toasting position when the temperature of the food has reached a predetermined level. A time delay mechanism is electrically connected to the temperature sensing switch for disabling the switch during an initial period of time at the start of each toasting cycle when the carriage is moved to its toasting position.

Claims

1. An electric toaster comprising:

a housing;

at least one heating element mounted in said housing;

a source of electric power selectively connected to said heating element for energizing said elements;

a carriage mounted in said housing for supporting a food product to be toasted and movable between an upper non-toasting position and a lower toasting position;

an electrically operated latch mechanism for holding said carriage in its toasting position;

a normally open temperature sensing switch electrically connected to said latch mechanism for releasing said mechanism and returning said carriage to its non-toasting position upon closure of said switch when the temperature of the food product has attained a predetermined level; and

a time delay mechanism electrically connected to said temperature sensing switch for preventing current flow to said switch during an initial predetermined period of time at the start of each toasting cycle when the carriage is moved to its toasting position.

2. An electric toaster in accordance with claim 1 wherein the predetermined period of time is 10 seconds.

3. An electric toaster in accordance with claim 2 wherein the latch mechanism is a pop-up solenoid.

4. An electric toaster in accordance with claim 3 wherein the temperature sensing switch and the time delay mechanism are electrically connected in series with said pop-up solenoid.

5. An electric toaster in accordance with claim 1 wherein the temperature sensing switch and the time delay mechanism are electrically connected in series with said latch mechanism.

6. An electric toaster in accordance with claim 1 wherein said time delay mechanism includes a normally non-conducting silicon controlled rectifier connected in series with said temperature sensing switch, said silicon controlled rectifier having a gate;

a programmable unijunction transistor electrically connected in series with said gate of said silicon controlled rectifier for transmitting an electrical pulse to said gate to place said silicon controlled rectifier in a conducting state, said programmable unijunction transistor normally being in a non-conducting state and being placed in a conducting state after the lapse of said initial predetermined period of time to transmit said electrical pulse to said gate of said silicon controlled rectifier.