H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 3/20 (2006.01) A47J 27/21 (2006.01) H01H 37/00 (2006.01) H01H 37/14 (2006.01) H05B 1/02 (2006.01) H05B 3/30 (2006.01) H05B 3/82 (2006.01)
Patent
CA 2173717
A planar heating element for an electrically-heated water boiling vessel comprises a stainless steel plate having a printed heating element formed on one side thereof, the printcd heating element being sandwiched between electrically-insulating layers of glass. A control for switching off the element in an overtemperature situation has a primary actuator in the form of a bimetal which directly accesses the printing element through a window formed in the outermost glass insulating layer, and the bimetal is held in a secondary actuator in the form of a thermally-collapsible carrier for the bimetal which contacts the glass insulation around the window. By virtue of this arrangement the primary and secondary actuators are subjected to different temperatures which ensures that the secondary actuator is not susceptible to nuisance operation.
Un élément chauffant plan, destiné à une structure de bouilloire électrique, comprend une plaque d'acier inoxydable dont un côté porte un élément chauffant imprimé intercalé entre des couches de verre servant d'isolants électriques. Une commande, qui permet de mettre l'élément hors circuit en cas de surchauffe, comporte un actuateur primaire prenant la forme d'une bilame qui aboutit directement à l'élément imprimé au travers d'une fenêtre ménagée dans la couche de verre isolante externe. Cette bilame est maintenue dans un actuateur secondaire prenant la forme d'un porte-bilame thermo-rétractable qui est en contact avec l'isolation de verre entourant la fenêtre. Grâce à cette disposition, les actuateurs primaires et secondaire sont soumis à des températures différentes, ce qui permet d'assurer que l'actuateur secondaire ne fonctionne pas de manière intempestive.
O'neill Robert Andrew
Otter Controls Limited
Sim & Mcburney
LandOfFree
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