Adjustable ceiling lamp

The yellow lamp can be set at any position in space.
The beige and pink arms help with position adjustment in the horizontal plane.
The Sarrus mechanism (blue bars, gray and green plates) helps to adjust the vertical position. The red counterweight keeps the mechanism vertically balanced. The red cable is fixed to the small diameter part of the yellow pulley. The blue cable is fixed to the large diameter part of the yellow pulley.
The friction at the revolute joints of the blue bars can be adjusted using violet screws.
By tightening the violet screws, the bars is deformed and compress the black washers to increase friction in the revolute joints.

STEP files of this video:
https://www.mediafire.com/file/3znx9u15rto06ne/AdjustableCeilingLampSTEP.zip/file
Inventor files of this video:
https://www.mediafire.com/file/8k3si6y8u8v5pm7/AdjustableCeilingLampInv.zip/file

Видео Adjustable ceiling lamp канала thang010146