Multi-element cooking unit with control device

A glass ceramic cooking unit, comprising:

• a glass ceramic hob having a substantially circular main heating element and at least one additional heating element arranged adjacent the main heating element, the main and the at least one additional heating elements together forming an elongated rectangular configuration;
• a rotatably mounted setting shaft, rotatable over an angular range for regulating the heating elements;
• a cam fixed on the setting shaft for rotation therewith, the cam having a shoulder extending therefrom;
• a cam plate rotatably mounted on the setting shaft, the cam plate having an arcuate slot, defining the angular range, for slidably receiving the shoulder of the cam, the cam plate being rotatably driven by the cam whenever the shoulder engages either end of the arcuate slot, the cam and cam plate being otherwise relatively rotatable;
• and,
• switching means having contacts operable in response to rotation of the cam plate into contact therewith, the setting shaft, cam, cam plate and switching means together forming a control device for the main and at least one additional heating elements, rotation of the setting shaft in the angular range regulating the main heating element, rotation beyond the angular range activating the at least one additional heating element, and further rotation thereafter in the angular range regulating both the main and at least one heating elements together.