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US 5,138,120 AGranted
Timing mechanism with a PTC thermistor
AssigneeEmerson Electric Co.
InventorGeorge W. Adams
Life of this patent
Estimating the term…
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.
Claims1
In a timing mechanism wherein a first cam means is rotatably driven by a motor drive means and wherein first electrical switch means is responsive to said first cam means to be opened and closed in accordance with a first program of said first cam means, means for providing a second program composed of switching pulses, comprising:
- second cam means rotatably driven by said motor drive means,
- second switch means responsive to said second cam means and including an electrical contact comprising a PTC thermistor.
Dependencies are inferred from the claim text.