Clutch 3 slides along square guide a of shaft 1. Clutch 4 slides along square guide b of hollow shaft 11. Gears 8, 9 and 10 are keyed to shaft 2 and are in constant engagement with gears 5, 6 and 7 which rotate freely about shafts 1 and 11. When driving shaft 1 rotates, driven shaft 2 can have any one of three speeds: for the first, clutch 4 is engaged to gear 7 and clutch 3 to hollow shaft 11; for the second, clutch 4 is engaged to gear 6 and clutch 3 to hollow shaft 11; and for the third, clutch 4 is in the neutral position and clutch 3 is engaged to gear 5. The corresponding transmission ratios are i₁₂=-z₁₀/z₇, i₁₂=-z₉/z₆ and i₁₂=-z₈/z₅ where z₅, z₆, z₇, z₈, z₉ and z₁₀ are numbers of teeth of gears 5, 6, 7, 8, 9 and 10.
$2847$CxG,SR$