Hinge for a roof window and roof window with a set of hinges

A hinge for a roof window with a stationary primary frame having a plurality of frame members including at least two opposing side members, and at least one secondary frame including a sash having a plurality of sash members including at least two opposing side members and an intermediate frame, said hinge being configured to be connected to one of the stationary primary frame and the intermediate frame and said hinge further being configured to be connected to the secondary frame sash to define a hinge axis of the roof window,

• said hinge 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 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, the guiding means comprising a linkage mechanism including at least two links providing connection between the sash hinge part and the frame hinge part, each link of the at least two links being connected to at least one of the frame hinge part and the sash hinge part at a joint and the at least two links being connected to each other, the frame hinge part comprising a base plate defining a hinge plane substantially perpendicular to the 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 at least two links of the linkage mechanism are connected to each other by a bearing axle and the at least two links comprise a sash link providing a connection between the bearing axle and the frame hinge part, and a frame link providing a connection between the bearing axle and the sash hinge part,
• a force transmission device is provided for exerting lifting assistance to the movement of the sash relative to the stationary primary frame during opening of the roof window in the mounted condition of the hinge, and that said force transmission device is provided with biasing means,
• wherein the biasing means of the force transmission device comprises at least one leaf spring,
• wherein the frame link is connected to the sash hinge part in a sliding joint,
• wherein the force transmission device comprises at least one pick-up connected to the sash hinge part in a hinged joint and configured to act on the sliding joint,
• wherein said pick-up is biased by the at least one leaf spring,
• said at least one leaf spring being connected to the sash hinge part by means of a fastening protrusion, and
• said at least one leaf spring being connected to the pick-up by a first abutment protrusion and a second abutment protrusion.