A PIVOT HINGE HAVING IMPROVED FRICTIONAL PROPERTIES

The hinge is intended for use in a pivotal window with a frame and a sash connected to the frame by providing a pivoting movement for the window about a hinge axis. A first hinge part (1) to be secured on the frame and including a first base plate (2), a braking device with a leaf spring (15), and control means in the form of an arc shaped, preferably circular-arc shaped, guide (7); and a second hinge part (3) to be secured on the sash and including a second base plate (4) and an engagement set with a slide bar (8) and a guide pin (10). The arc shaped guide (7) cooperates with the engagement set, the slide bar (8) being adapted to fit in the guide (7) and being rotationally mounted on the second base plate (4), the guide pin (10) being mounted on the second base plate (4), and the leaf spring (15) is, during at least a part of the pivoting movement, in a frictional engagement with at least one element of the engagement set of the second hinge part (3). The guide pin (10) comprises a tensioning projection (10a) and an adjoining convex side (10c).