At the beginning of engagement (lower half of the drawing), sleeve 4 is shifted to the right so that cone 1 contacts cone 8 which is secured on rods 2 sliding in holes of driven disk 5. After equalizing the speeds of the driving and driven cones, 1 and 8, further movement of sleeve 4 engages clutch jaws, 6 and 7 (upper half of the drawing). Springs 3 hold the cones in contact.
$447$SL,C$