Patent ID: 7825347

Claim:
An electric rotary switch with a rotary switching unit being mounted in a housing and having at least one switch contact for acting on switch contact traces assigned to a base, the rotary switching unit being coupled to an actuation element and cooperating with a locking sleeve, bevel or indentation for determining switch positions, allocated in part, to the end side of the rotary switching unit pointing in the direction of the base and, in part, to the base, the electric rotary switch characterized by: a first dome of the rotary switching unit receiving said locking sleeve and biased by a compression spring received in said first dome; said locking sleeve interacting with at least one base-side indention or stopping bevel; and said actuation element being mounted so that it can move axially to a bottom end position flush with an upper edge of the housing, wherein a projection of the switch contact is held in a compression spring-loaded manner in a second dome of the rotary switching unit, wherein the rotary switching unit includes a recess used for rotationally fixed holding of the actuation element, wherein a tab engaging in the recess is formed on the actuation element, wherein the actuation element is supported in a compression spring-loaded manner on the base and has a cardioid-shaped curve, in which a rotary switching unit fixed pin engages, in order to hold the actuation element in the bottom end position when pressure is applied and to release the element again when pressure is re-applied, wherein the pin has an S-shape where one end is fixed in the recess of the rotary switching unit and the other end extends above the rotary switching unit into the cardioid-shaped curve of the actuation element, and wherein the cardioid-shaped curve is formed in a tab of the actuation element.