US Patent 7138592 Electric actuation device

An electric operating part assembly has a switching mat and switching mat domes which are arranged therein and which can be operated by the effect of a vertical force. The operating part has at least one pull rocker which, in its longitudinal course, is arranged parallel to the surface of the switching mat. When the pull rocker is operated, a switching arm of the pull rocker situated opposite the operating arm will move a ram arranged between the switching arm and the switching mat dome, for operating the switching mat dome, in the direction of the switching mat dome.