Device for movably fastening a vehicle system to a primary structure (P) of a vehicle , having: a drive unit , which is designed to provide a rotatory movement of a drive element with respect to the primary structure (P); a first supporting element (S1), which is coupled in a rotatory manner to the drive element via a first rotation axis (A1); wherein the first supporting element (S1) is mounted in a rotatory manner with respect to the primary structure (P) of the vehicle via a second rotation axis (A2); a second supporting element (S2), which is coupled in a rotatory manner to the first supporting element (S1); a first connecting element (L12), which is mounted in a rotatory manner with respect to the primary structure (P) of the vehicle via a third rotation axis (A3); wherein the first rotation axis (A1) is spaced apart from the second rotation axis (A2) by a constant distance (r1); wherein the first connecting element (L12) is coupled in a rotatory manner to the second supporting element (S2) via a fourth rotation axis (A4); wherein the second supporting element (S2) is coupled in a rotatory manner to the first supporting element (S1) via a fifth rotation axis (A5), which is spaced apart from the fourth rotation axis (A4), and therefore, during a movement of the first supporting element (S1) about the second rotation axis (A2), the first supporting element (S1) is movable with a rotational speed which differs from a rotational speed of the second supporting element (S2); wherein the fourth rotation axis (A4) is spaced apart from the fifth rotation axis (A5) by a constant distance (r3); wherein the fifth rotation axis (A5) is spaced apart from the first rotation axis (A1) characterized in that the first connecting element (L12) has a first actuator, which is designed to change a length (R2) of the first connecting element (L12) in order thus to adapt the rotational speed of the first supporting element (S1) with respect to the rotational speed of the second supporting element (S2). a drive unit , which is designed to provide a rotatory movement of a drive element with respect to the primary structure (P); a first supporting element (S1), which is coupled in a rotatory manner to the drive element via a first rotation axis (A1); wherein the first supporting element (S1) is mounted in a rotatory manner with respect to the primary structure (P) of the vehicle via a second rotation axis (A2); a second supporting element (S2), which is coupled in a rotatory manner to the first supporting element (S1); a first connecting element (L12), which is mounted in a rotatory manner with respect to the primary structure (P) of the vehicle via a third rotation axis (A3); wherein the first rotation axis (A1) is spaced apart from the second rotation axis (A2) by a constant distance (r1); wherein the first connecting element (L12) is coupled in a rotatory manner to the second supporting element (S2) via a fourth rotation axis (A4); wherein the second supporting element (S2) is coupled in a rotatory manner to the first supporting element (S1) via a fifth rotation axis (A5), which is spaced apart from the fourth rotation axis (A4), and therefore, during a movement of the first supporting element (S1) about the second rotation axis (A2), the first supporting element (S1) is movable with a rotational speed which differs from a rotational speed of the second supporting element (S2); wherein the fourth rotation axis (A4) is spaced apart from the fifth rotation axis (A5) by a constant distance (r3); wherein the fifth rotation axis (A5) is spaced apart from the first rotation axis (A1) characterized in that the first connecting element (L12) has a first actuator, which is designed to change a length (R2) of the first connecting element (L12) in order thus to adapt the rotational speed of the first supporting element (S1) with respect to the rotational speed of the second supporting element (S2). <EOS>