Screw 2-stage telescopic actuator 1b

Input: blue bush having an internal gear.
Pink tube has a prismatic joint with the input shaft, a helical joint with the grey base (the first screw-nut drive), a helical joint with green center screw (the second screw-nut drive) and a revolution joint with the orange tube. The latter has a prismatic joint with the base.
The green tube fixed to the center screw has a prismatic joint with the orange tube.
The first screw-nut drive is of right hand thread, L1 mm lead.
The second screw-nut drive is of left hand thread, L2 mm lead.
When the operator rotates the blue bush, the rotation is transmitted to the yellow center shaft through the gear train (blue, green and yellow gears).
If the yellow shaft rotates N revolutions, the green slider performs a displacement of N*(L1+L2) mm.
This video was made based on US patent US8220349.

STEP files of this video:
https://www.mediafire.com/file/b9u6rq...
Inventor files of this video:
https://www.mediafire.com/file/59w4ob...