Seat back adjuster 1

When the green lever is raised, its slot will take the pink tooth bar out of the yellow gear of the yellow seat back frame to unlock the seat back.
Move the seat back frame to the desired position, release the green lever, the red spring lowers the green lever to lock the seat back frame by pressing the pink tooth bar towards the yellow seat back frame gear.
Any moment applied to the seat back frame cannot cause the pink tooth bar to rotate because the gear force is directed toward the axis of rotation of the pink tooth bar.
The blue spiral spring (its inner end is fixed) tends to rotate the seat back frame counterclockwise.
The green pin of the lever and the circular slot of the seat base give the lever its rigidity.
Green and orange arrows represent human actions to adjust the chair back.
This video is made based on video
https://youtu.be/SleXUhHLkH8

Видео Seat back adjuster 1 канала thang010146