Table of adjustable height 1a

This table uses the 8-bar mechanism shown at:
https://youtu.be/joJUV5Cbr4w
Turn the pink crank to change the table height thanks to the screw-nut drive (pink screw, red nut).
The upper frame translates along an approximately straight line and is kept parallel to the base.
Distances between revolution joints of grey base or upper frame: a
Length of blue bar: a
Length of green bars: 0.4a + 0.6a
Length of orange bars: 0.4a
Advantage over tables of scissor mechanism: no prismatic joints
See a real table:
https://youtu.be/rsAOW3T4i_4

Inventor files of this video:
http://www.mediafire.com/file/budav08sna7ejzq/TableAdjustableHeight1aInv.zip/file

Видео Table of adjustable height 1a канала thang010146