Tumbler gear arm 9 turns about the axis of cylindrical slider b which can be shifted axially along square guide a of shaft 1. Pinion 10 is rigidly attached to (or integral with) slider b and meshes with tumbler gear 3 which is mounted on stud c that rotates in bearings d of arm 9. Tumbler gear 3 can be brought into engagement with any one of cone gears 4, 5, 6, 7 and 8 which are keyed to shaft 2. This is accomplished by turning arm 9 with handle e and shifting it along shaft 1 to the required cone gear. The transmission ratio for the position shown is i₁₂=z₆/z₁₀ where z₆ and z₁₀ are the numbers of teeth of gears 6 and 10. When driving shaft 1 rotates, driven shaft 2 can have any one of five speeds depending on which cone gear is meshing with the tumbler gear.
$2857$CxG,SR$