Crank 1 rotates about fixed axis B and is connected by turning pair C to link 2 which, in turn, is connected by turning pair D to link 3. Link 3 is connected by screw pair E to link 4 which turns about fixed axis A. The helix angle of the thread of screw pair E is greater than the angle of friction. When crank 1 rotates about axis B, link 3 oscillates about axis A and about its own axis z-z.
$2231$LS,5L$