Method for mounting a drive assembly for door and window frames

A method for mounting a drive assembly on a door or window frame having at least one slot, the drive assembly comprising:

• at least one transmission rod elongated along a longitudinal axis and having a constant cross-section in a plane orthogonal to said longitudinal axis, said transmission rod comprising a central portion and two lateral portions situated at opposite parts relative to the central portion and forming respective channel-shaped guides, the central portion having a base with a planar upper surface, the base of the central portion being connected to said lateral portions by two longitudinal ribs, the base of the central portion and the ribs forming a longitudinal groove having in a cross-section the shape of an inverted “U” that separates from each other said lateral portions, the central portion having two lateral extensions that extend laterally beyond the respective ribs,
• at least one actuating member having a coupling portion for coupling with said transmission rod, the coupling portion having a pre-threaded through hole and comprising a base and two feet projecting from said base, said feet slidably engaging said channel-shaped guides of the transmission rod, said feet having abutment portions for abutting said lateral extensions,
• a screw having a longitudinal axis, the screw including a threaded body and a tip with a non-threaded cylindrical lateral wall with a smaller diameter than the diameter of the threaded body, the threaded body being engaged in said pre-threaded hole, the tip ending with a flat wall orthogonal to the longitudinal axis of the screw, wherein in a partially screwed position of said screw said flat wall faces said planar upper surface of the transmission rod,
• the method comprising the steps of:
• slidably engaging the feet of the actuating member with the channel-shaped guides of the transmission rod with the screw in said partially screwed position;
• inserting frontally the actuating member and the transmission rod into a respective slot of the frame;
• completely tightening said screw into said pre-threaded through hole thereby causing said tip to penetrate into said base of the transmission rod and forming in said base a hole with a smooth lateral wall,
• wherein, during tightening of said screw, said lateral extensions of the transmission rod and said abutment portions of the actuating member sustain without disengaging from each other a reaction force generated when said flat wall of the screw cuts into the base of the transmission rod.