Oscillating roller shutter (upper shaft) 
This four meters width window is divided by the mullion, which helps not dart the lintel. Each of these parts is fragmented into a hinged leaf on one side, two fixed at the bottom, two sliding in the central part and two horizontal pivoting on bottom axis at the top of the window. To protect from the sun uses a conventional roller blind which also acts as an awning thanks to the oscillating position of its guides.
Window with the roller shutter in overhung position. This position allows the views below the shutter, while protecting from sunrays.
Constructive detail. Axonometric section.
General view from School's web address