A WINDOW, PARTICULARLY FOR INSTALLATION IN AN INCLINED ROOF SURFACE

摘要

A window, particularly for installation in an inclined roof surface, comprising a main frame and a frame hinged to the top thereof as well as a frame lifting arm (5) inserted between the main frame and the frame, said arm having one end pivotally connected with a lateral member of the main frame or the frame and its other end pivotally connected with a slide shoe (6) which in a longitudinally displaceable manner is connected with the corresponding lateral member of the main frame or the frame, respectively. The slide shoe is associated with a pre-stressed lifting spring (13), as a first coupling member on the slide shoe is adapted to engage with a second coupling member connected with the lifting spring when installing the window. Between the slide shoe and the lifting spring an auxiliary spring (12) is inserted, the pre-stressing of which can be adjusted in dependence on the roof inclination, by means of a manually operated adjusting element, for supplementing the spring force from the lifting spring within a given range of the opening angle of the window. The auxiliary spring can be accommodated in a spring box (11) between an abutment (19) which is stationary with respect to the spring box and an abutment (18) which is movable along the spring box. It is thereby easy to open the window and park it in a stable position of rest at an arbitrary opening angle.