Universal operating device for a screen, such as a window covering

An operating device for a screen, wherein the screen is provided with a screen shaft, said operating device comprising:

• a drive element for the screen shaft, comprising:
• a first operating mechanism comprising a first operating element wherein the first operating element is connected to a first movement transfer element connected by a first transmission to the drive element, wherein the first operating mechanism is configured to convert a linear movement of the first operating element to a rotational movement of the drive element for operating the screen shaft in a first rotational direction,
• a second operating mechanism comprising a second operating element wherein the second operating element is connected to a second movement transfer element connected by a second transmission to the drive element, wherein the second operating mechanism is configured to convert a linear movement of the second operating element to a rotational movement of the drive element for operating the screen shaft in a second rotational direction opposite to the first rotational direction, wherein the first operating mechanism comprises a first pull cord and the first movement transfer element comprises a first cord reel for winding up the first pull cord, wherein the second operating mechanism comprises a second pull cord and the second movement transfer element comprises a second cord reel for winding up the second pull cord, wherein the operating device comprises a recoil spring, wherein the recoil spring mutually connects the first pull cord and the second pull cord, wherein the first cord reel has a first central passage for a pin of a screen shaft holder and the first cord reel is provided with a first collar extending concentrically around the first central passage, wherein the second cord reel has a second central passage for the pin and the second cord reel is provided with a second collar extending concentrically around the second central passage, wherein the first cord reel and the second cord reel are arranged adjacently and completely enclose the recoil spring, wherein the recoil spring is arranged between the first collar and the second collar and a first end of the recoil spring is directly connected to the first collar and a second end of the recoil spring is directly connected the second collar.