(57) It comprises independent and coplanar panes (3) which can be displaced linearly guided
in the upper (1) and lower (1') horizontal profiles of the frame as far as successively
achieving a certain position where they can rotate through 90°. The panes have four
rolling supports, two forward (8, 9) and two rear (6, 7). The rear supports (6, 7)
define the hinging axes and are constantly connected to the horizontal profiles (1,
1') of the frame. The forward ones (8, 9) can exit when they reach a lateral opening
(24) of those horizontal profiles (1, 1') when the rear ones (6, 7) face and fit into
separate hinges (14) premounted in the horizontal profiles (1, 1').
The hinges (14) have a fixed part (15) attached to the horizontal profile (1, 1')
and the other rotating part (18) being assisted by a spring (16) which keeps it in
an optimum position for being able to receive the connection element (13) of the rear
supports (6, 7). The first pane rotates only and comprises some prismatic wedges (31,
31') as rear supports (6, 7) which are attached to the first upper and lower hinge
(14) respectively.
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