Improvement in the lattice windows, characterized by the provision of inside the profile of the frame members the coupling of some longitudinal bars arranged, which have points of articulation with the ends of the glass-bearing parts, as well as a point of articulation with a connecting rod that, at its lower end, joins a grooved arc, which ends in a circumferentially toothed circular area in which an existing spindle is adapted to the axis of an action crank, in order that the rotation of said crank originates a descent at the end of the arc that pulls the bar causing it to move in said downward direction, or upward if the crank turn is made in the opposite direction. (Machine-translation by Google Translate, not legally binding)
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