The window unit of the invention comprises four peripheral channel members linked with corner members to form a window frame. Two glass panels are spaced by this frame to form an inner chamber, the venetian blind structure of the invention being located completely therein. The venetian blind structure comprises a plurality of horizontal slats pivotally supported at both their extremities and each having an integral toothed wheel engaging a complementary rack on an actuator bar, the latter positioned adjacent to a side peripheral channel member and being free to move upwards or downwards along it. This upward or downward movement imparts a pivoting movement to the slats. The venetian blind structure further comprises a support channel member supporting a reversible electrical motor having a driving shaft. This shaft is aligned to engage properly the actuator bar. When the driving shaft rotates, it imparts a linear upward or downward movement to the actuator bar, thus pivoting the slats consequently. The alignment of the shaftis done by means of an L-shaped plate bored and threadingly engaged by an alignement sleeve, the latter being coaxially engaged by the driving shaft. This alignment of the shaft prevents the parts of the venetian blind structure from moving in undesired directions, relative to one another, and therefore reduces the chances of breaking these parts.
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