Link 1 is connected by screw pairs A and B to nuts 3 and 2. Nut 2 is connected by screw pair C to nut 3. Nut 2 has teeth a cut on its flange. By means of this supplementary nut 2, screwed into main nut 3, backlash is eliminated in screw pair A. Supplementary nut 2 is locked in the required position by strip 4 which enters the corresponding tooth space a.
$2278$LS,FD$