Concealed hinge for a turn-tilt window and tilt-turn window and window equipped therewith

Concealed hinge for a turn-tilt and tilt-turn window (1) with a fixed frame (2) and a leaf (3), whereby the concealed hinge (4) is provided with a scissor mechanism (22) with a main arm (24), of which a first section (24′) is provided at a first end (25) with a hinge for fastening the concealed hinge (4) to the top of the leaf (3), and of which a second section (24″) is hingeably connected at the second end (32) to a scissor hinge (33) that is intended for the hingeable connection of the main arm (24) to the fixed frame (2), whereby this scissor hinge (33) is composed of at least two scissor arms (34,35) that are hingeable with respect to one another in such a way that the concealed hinge (4) can be folded up to a folded-up situation, whereby the main arm (24) and the scissor arms (34,35) extend above one another and essentially parallel to one another in a horizontal direction, wherein in the aforementioned folded-up situation of the concealed hinge (4), when viewed vertically the main arm (24) with the aforementioned second section (24″) at its second end (32) is located between two of the at least two scissor arms (34,35).