Electric appliance with safety switching arrangement

Details Electric appliance with safety switching arrangement Electric appliance with safety switching arrangement

1992-11-03

1994-02-01

Paschall, Mark H.

Electric heating

Heating devices

With current connection and/or disconnection means

219508, 219492, 219518, 99329RT, 99327, A05B 102

Patent

active

052834212

ABSTRACT:
When a carriage of the toaster is in a lower position, a switch (21) is closed and power passes through a bridge rectifier circuit (22) to an integrated circuit (19), which, for the normal cooking operation, switches SCR (20) off so that a relay (7) is energised, switching switches (8) and (9) on to energise heating elements (2) and (3). Power is also supplied to a latch (27) to hold the carriage in the lower position. If, however, a fault detection is input from a residual core balance (12) to the integrated circuit (19), SCR (20) is switched on so that power from bridge rectifier (22) is shorted. This causes relay (7) and latch (27) to be de-energised so that the heating elements (2) and (3) are turned off and the carriage is returned to the upper position, causing switch (21) to open.

REFERENCES:
patent: 4170932 (1979-10-01), Lalancette
patent: 4245148 (1981-01-01), Gisske et al.
patent: 4395621 (1983-07-01), Parker
patent: 4755656 (1988-07-01), Charlesworth et al.
patent: 4976194 (1990-12-01), Kelterborn et al.
patent: 5094154 (1992-03-01), Nopanen

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