Actuator for moving a con-rod between two positions has a cylinder with a longitudinal axis, a connecting rod running to and fro in the cylinder and a first operating device to push the connecting rod along the axis.

摘要

An actuator has a cylinder (2) with a longitudinal axis (4). A connecting rod (8) runs to and fro in the cylinder. A first operating device (27,29) pushes the connecting rod along the axis between first and second end positions. Second operating devices (28) move the connecting rod into one or more intermediate positions between both end positions. The connecting rod forms chambers (24,25) of different volumes with the cylinder.