Hinge device for inclined tilting type windows with external cover rails

A hinge device for inclined tilting type windows having a stationary main frame and a tiltable sash with external cover rails on said main frame and said sash in overlapping relationship when the window is closed, comprising

• a first hinge part including a first base plate to be mounted on said main frame,
• a second hinge part including a second base plate to be mounted on said sash,
• an intermediate member connected to said first base plate by means of substantially parallel links, said links being connected through lower pivot pins to said intermediate member and through upper pivot pins to said first base plate, so as to be displaceable in a substantially translatory parallelogram-like movement relative to said first base plate,
• an upper pivot pin interconnecting said second base plate with said intermediate member and movable, by displacement of said intermediate member, between first and second positions in which it is located between the inner and outer surfaces of said main frame and spaced outwardly from its outer surface, respectively, and
• a coupling link having its ends pivotally connected by an upper pivot pin with said second base plate and by a lower pivot pin with an adjacent one of said parallel links, respectively, when the window is closed the upper pivot pins of the coupling link, the parallel links and the intermediate member are approximately in alignment and the lower pivot pins of the coupling link, the parallel links and the intermediate member are approximately in alignment, and are further so located that a line connecting the upper and lower pivot pins of the coupling link, when the window is closed, converges relative to a line connecting the upper and lower pivot pins of said adjacent pivotable link on said first base plate and said intermediate member, respectively, the upper pivot pin connecting said second base plate with said intermediate member being, in the same position of the hinge device, at least approximately coaxial with the upper pivot pin between said adjacent pivotable link and said first base plate.