A cluster of two gears, 5 and 6, slides along square guide a of shaft 1, and can be shifted into engagement with gears 9 and 10 which are keyed, together with gear 11, to sleeve 13. Sleeve 13 rotates freely about shaft 2. Gears 7 and 8 are keyed to sleeve 14 which rotates freely about shaft 1. Gears 7 and 11 are in constant engagement. Gear 12 slides along square guide b of shaft 2, into and out of engagement with gear 8. Clutches 3 and 4, integral with gears 6 and 12, can be shifted into engagement with the clutch members of gears 7 and 11. If both clutches are disengaged the transmission ratio is i₁₂=-(z₁₀/z₆)(z₇/z₁₁)(z₁₂/z₈) when gears 6 and 10 are in engagement, and i₁₂=-(z₉/z₅)(z₇/z₁₁)(z₁₂/z₈) when gears 5 and 9 are in engagement. If clutch 3 is engaged to gear 7 and clutch 4 is disengaged, the transmission ratio is i₁₂=-z₁₂/z₈. If clutch 3 is engaged to gear 7 and clutch 4 to gear 11, i₁₂=-z₁₁/z₇. If clutch 3 is disengaged and clutch 4 is engaged to gear 11, i₁₂=-z₁₀/z₆ when gears 10 and 6 are in engagement, and i₁₂=-z₉/z₅ when gears 5 and 9 are in engagement, where z₅, z₆,... ,z₁₂ are t he numbers of teeth of gears 5, 6,..., 12. Thus, when driving shaft 1 rotates, driven shaft 2 can have any one of six different speeds.
$2862$CxG,SR$