Worm 1 rotates about fixed axis A-A and has two sections, a and b, with threads of opposite hands. Threads a and b mesh with teeth c and d of worm wheels 2 and 3 which rotate about fixed axes B and C. Axes B and C are parallel to each other and are perpendicular to, but do not intersect, axis A-A. The transmission ratios of the mechanism are i₁₂=ω₁/ω₂=z₂/z₁' and i₁₃=ω₁/ω₃=z₃/z₁'' where ω₁, ω₂ and ω₃ are the angular velocities of worm 1 and of wheels 2 and 3, z₁' is the number of threads (starts) on worm section a, z₁'' is the number of threads (starts) on worm section b, and z₂ and z₃ are the numbers of teeth on wheels 2 and 3. When driving worm 1 rotates, driven wheels 2 and 3 rotate in opposite directions.
$2814$WG,4L$