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US 4,135,081 AGranted
Electric cooking plate with a temperature limiter
OwnerKarl Fischerinventor
Life of this patent
Estimating the term…
Abstract
A temperature limiter used as part of, or otherwise in combination with, an electric cooking plate. An improved switching hysteresis is enabled by a unique construction in which a laterally open recess is formed in a one-piece housing to receive a snap switch, the counter-contact of which is fixidly secured in slot structure adjacent said recess. A transmission rod is arranged within an expansion sleeve and is positioned to be spring biased through engagement with the spring of a snap switch.
Claims22
An electric cooking plate, comprising:
- a heat conductive support plate;
- means for electrically heating said support plate disposed thereon so as to form a heating element region and an unheated central zone;
- electrical circuit means for said heating means;
- a temperature limiter having first means for switching said heating means on and off in response to small temperature differences, said limiter being effective in a region of a limiting temperature;
- and,
- an adjustable energy controller for regulating power supply to the heating means through the temperature limiter, having second means for switching the power on and off with a relative switch-on duration varying in dependence on an adjusted setting and upon the temperature limiter becoming effective, the period of time between successive switch-offs of the temperature limiter being of the same order of magnitude as the relative switch-on duration of the energy controller, said first and second switch means being independently operable.
3 more elements
An electric cooking plate, having heating elements and electrical circuit terminal connection means, comprising:
- a substantially closed heat conductive support plate, having a heating element region and an unheated central zone;
- a temperature limiter disposed on the underside of the cooking plate;
- a housing disposed on the underside of the unheated central zone in which said temperature limiter is mounted;
- and,
- a temperature detector connected to said temperature limiter and projecting out from the unheated central zone and extending over the underside of the heating element region in close proximity thereto.
2 more elements
Dependencies are inferred from the claim text.