Turn yellow shell to move the pink bush for tightening or loosening the black work piece as shown in the three first scenes of the video.
The last scene of video shows how the lathe spindle to which the black work piece is clamped rotates while the yellow shell is immobile.
This collet chuck may be operated to loosen or tighten the work piece without stopping the lathe spindle.
This video was made based on US patent 2345069

STEP files of this video:
https://www.mediafire.com/file/dddvyk...
Inventor files of this video:
https://www.mediafire.com/file/05l5nv...