An actuation device for a window including a closure pin, the actuation device comprising: - a frame; - a runner which can slide in a longitudinal direction of the frame; - a first arm which is rotatably connected to the runner at a first end thereof and to the window at a second end thereof, the first arm being connected to the runner by means of a first rotary joint; - a second arm which is rotatably connected to the frame and which is slidingly connected to the first arm at an intermediate zone between the first end and the second end; - an actuator for actuating the runner in the longitudinal direction; - wherein the first arm comprises a coupling mechanism which is configured to be coupled/uncoupled to/from a closure pin of the window, wherein the coupling mechanism comprises a blocking element which is rotatably connected to a main member of the first arm and which is configured so as to close a housing recess for the closure pin which is formed at the second end of the first arm and an actuator element which is configured to slide with respect to said main member, wherein the actuator element and the blocking element are capable of mutual engagement, the actuator element being movable between a first position, in which the actuator element and the blocking element are mutually engaged and the rotation of the blocking element is prevented, and a second position, in which the actuator element and the blocking element are disengaged and the blocking element is free to rotate with respect to the main member and in an independent manner with respect to the actuator element, wherein the blocking element comprises a contact surface which is configured so as to rotate the blocking element following contact with the closure pin so as to open the housing recess and to disengage the closure pin only following a manual stress which is obtained by means of a movement of the closure pin, characterized in that the actuator element and the blocking element comprise respective abutment extensions (76, 77) which are configured so as to be one in contact with the other when the actuator element is in the first position and are separated from each other when the actuator element is in the second position. - a frame; - a runner which can slide in a longitudinal direction of the frame; - a first arm which is rotatably connected to the runner at a first end thereof and to the window at a second end thereof, the first arm being connected to the runner by means of a first rotary joint; - a second arm which is rotatably connected to the frame and which is slidingly connected to the first arm at an intermediate zone between the first end and the second end; - an actuator for actuating the runner in the longitudinal direction; - wherein the first arm comprises a coupling mechanism which is configured to be coupled/uncoupled to/from a closure pin of the window, wherein the coupling mechanism comprises a blocking element which is rotatably connected to a main member of the first arm and which is configured so as to close a housing recess for the closure pin which is formed at the second end of the first arm and an actuator element which is configured to slide with respect to said main member, wherein the actuator element and the blocking element are capable of mutual engagement, the actuator element being movable between a first position, in which the actuator element and the blocking element are mutually engaged and the rotation of the blocking element is prevented, and a second position, in which the actuator element and the blocking element are disengaged and the blocking element is free to rotate with respect to the main member and in an independent manner with respect to the actuator element, wherein the blocking element comprises a contact surface which is configured so as to rotate the blocking element following contact with the closure pin so as to open the housing recess and to disengage the closure pin only following a manual stress which is obtained by means of a movement of the closure pin, characterized in that the actuator element and the blocking element comprise respective abutment extensions (76, 77) which are configured so as to be one in contact with the other when the actuator element is in the first position and are separated from each other when the actuator element is in the second position.