Timing mechanism with a PTC thermistor

Details Timing mechanism with a PTC thermistor Timing mechanism with a PTC thermistor

1992-03-30

1993-05-25

Scott, J. R.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

H01H 700, H01H 4300

Patent

active

052143104

ABSTRACT:
A timing mechanism has cams operating switches which control the functions of an appliance and another cam operating another switch supplying short pulses to a separate function such as a warning buzzer. A PTC thermistor is in series with the switch supplying the short pulses which when applied to the buzzer electrical circuit provides a short controlled "on" time to the buzzer even though power is applied to the complete switching system for an extended period of time by the timing mechanism.

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