Hot warning device for cooking apparatus
AssigneeElectrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H.
InventorHelmut Bayer
Life of this patent
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Abstract
In a cooking and heating apparatus, a device for warning personnel of dangerously hot temperature is incorporated within the structure of a thermostat which has a switch for regulating the flow of electric current to a heating element of the apparatus. The thermostat includes a push rod mechanically coupled to a finger-like termination which extends through an aperture in an arm of the regulating switch to engage the arm of a further switch used in activating a warning indication. A collar on the termination engages the arm of the regulating switch subsequent to the activation of the further switch by the rod. The rod expands with increasing temperature and, thereby, initiates the warning at a lower temperature than the temperature of the power cut off by the regulating switch.
Claims14
In a device for "hot warning" and for regulating and limiting the temperature of radiation or contact heating bodies of electric heating apparatuses in combination with heating surfaces made of metal, glass, ceramics and the like, in which an outer end of a temperature sensor is arranged between the heating body and the cooking surface in order to regulate and limit the temperature of the heating body, said sensor having a rod made of a material with a high coefficient of thermal expansion disposed in a tube made of a material of a low coefficient of thermal expansion, said device including a switch head, an inner end of the rod extending to the switch head and being in communication via a transmission member with a switch system, the switch system serving for the regulating and limiting of the temperature of the heating body and for operation of a signal device, an outer end of the rod being joined to an outer end of the tube, an inner end of the tube connecting with the switch head, the improvement wherein
- the transmission member has a first part of larger cross section and a second part of smaller cross section, the transmission member being disposed as a direct extension of the rod and coaxial thereto, said first part of the transmission member directly adjoining the rod and having, adjacent a transition region to said second part, a first actuating surface and, on a free end of said second part, a second actuating surface for actuating different components of the switch system at different temperatures, said first and said second parts being disposed about a common axis for transmitting a force of said rod directly along said axis to said components of said switch system.
Dependencies are inferred from the claim text.