Roof window with a set of hinges

A roof window comprising:

• a stationary primary frame having a plurality of frame members including at least two opposing side members,
• a first secondary frame including a sash having a plurality of sash members including at least two opposing side members,
• a second secondary frame including an intermediate frame,
• a lifting device including a spring assembly acting on a lifting arm inserted between the stationary primary frame and the intermediate frame, the lifting arm being at one end rotatably connected with a sledge system slidably connected with the stationary primary frame and coupled to the spring assembly, and at another end rotatably connected with the intermediate frame,
• a top hinge arrangement connected to the stationary primary frame and to the sash and the intermediate frame to define a first hinge axis at or near a top of the roof window in a first operational condition of the roof window, and
• a hinge arrangement comprising a set of hinges connected to the intermediate frame and to the sash to define a second hinge axis of the roof window to provide a second operational condition of the roof window, each hinge of said set of hinges comprising a frame hinge part, a sash hinge part, and a movement supporting assembly comprising guiding means configured to allow the sash hinge part to assume an angle relative to the frame hinge part substantially around said second hinge axis during an opening movement from a closed position to an open position and during a closing movement from the open position to the closed position in the second operational condition of the roof window, the frame hinge part of each hinge being connected to the intermediate frame, and the sash hinge part of each hinge being connected to one of said sash side members, the frame hinge part comprising a base plate defining a hinge plane substantially perpendicular to the second hinge axis of the roof window and the sash hinge part comprising a base plate substantially parallel to the base plate of the frame hinge part,
• the guiding means comprise a linkage mechanism including at least two links providing connection between the sash hinge part and the frame hinge part, each link being connected to at least one of the frame hinge part and the sash hinge part at a joint and connected to each other in a bearing axle,
• that at least one of the joints between the links and the frame and sash hinge parts comprises a sliding joint cooperating with a guide track and at least one other joint of said joints is selected from the group consisting of a sliding joint and a hinged joint,
• that the at least two links comprise a sash link providing connection between the bearing axle and the frame hinge part, and a frame link providing connection between the bearing axle and the sash hinge part,
• wherein one guide track is provided in a respective link of the linkage mechanism, such that a stable movement in the guide track is achieved, and
• wherein the frame link is connected to the sash hinge part in the at least one of the joints comprising the sliding joint and the sash link is connected to the frame hinge part in a sliding joint.