SCREW MECHANISM Russian patent published in 2010 - IPC F16H25/20 

FIELD: machine building.

SUBSTANCE: screw mechanism consists of cylinder case with upper and lower flange, of screw with nut and of gear electric drive with output shaft secured on lower flange. A retractable bar lengthwise axis of which coincides with lengthwise axis of the case is installed inside the cylinder case. The nut is motionless fixed on the lower flange of the retractable beam. With its one end the rotary screw is fixed on the upper internal flange of the case, with its another end the screw projects from the nut outside the external flange of the retractable bar and is connected with the main output shaft of the said electric drive. Side surfaces of the said flanges facing walls of correspondingly case and retractable bar are movable and conjugate with the walls. The mechanism also contains an additional pair of the screw and nut installed similarly to the main part with diametrically opposite side relative to walls of the case and retractable bar. One end of the additional screw is coupled with the additional output shaft of the said electric drive.

EFFECT: raised reliability and precision of mechanism operation, improved dimension and weight characteristics of mechanism.

4 cl, 3 dwg