Patent ID: 8108971

Claim:
Hinge for a roof window with a pivot sash, said roof window comprising a frame and said sash each comprising two side members with side surfaces, top members and bottom members, said frame and said sash being connected by two said hinges, each said hinge comprising two hinge parts, each hinge part each having a base plate with means enabling securing the base plate to the side surface of the side member of the frame and the side member of the sash, the base plate secured to the side member of the frame having at one side an arched-bent guide and the base plate secured to the side member of the sash having at one side a pivoting hook member with an arch bent arm and a guide pin, said guide pin mating with the arched guide, and a bumper limiting the range of hook member pivoting, the hinge being equipped with a braking frictional member, which keeps the sash in a fixed position, wherein the base plate between the arched members of the guide, has located therein a through, elongated recess, and at a side opposite to the arched guide on the plate a mechanism balancing the sash is mounted, said mechanism interacting with the guide pin mounted on the hinge base plate.