Idler gear 3 rotates about the axis of cylindrical slider a which can be shifted along slanted square guide b. Cone gears 4, 5, 6, 7 and 8 are keyed to shaft 1; cone gears 9, 10, 11, 12 and 13 are keyed to shaft 2. The sum of the pitch radii is the same for all the pairs of opposing gears. By shifting idler gear 3 along guide b it can be brought into engagement with any pair of opposing gears. The transmission ratio for the position shown is i₁₂=z₁₁/z₆ where z₆ and z₁₁ are the numbers of teeth of gears 6 and 11. When driving shaft 1 rotates, driven shaft 2 can have any one of five speeds depending upon which pair of gears, 4 and 9, 5 and 10, 6 and 11, 7 and 12, or 8 and 13, idler gear 3 is in engagement with.
$2859$CxG,SR$