A kinematic diagram of the mechanism is shown in Fig. a and a design version of a speed gearbox based on this mechanism is shown in Fig. b. Links 1 and 2 rotate independently of each other about fixed axis A. Link 3, rotating about fixed axis B, is designed as a two-arm lever connected by turning pairs C and D to sliders 5 and 4 which slide in the slots of links 2 and 1. Links 2 and 1 are designed as gears meshing with pinions 6 and 7 which are rigidly mounted on shafts E and F. These shafts rotate in fixed bearings of the speed gearbox. Angles of rotation ϕ₁, ϕ₂ and ϕ₃ of links 1, 2 and 3 are related by the conditions: ϕ₁=arctan((A͞C sin(ϕ₃))/((A͞C cos(ϕ₃))-A͞B) ϕ₂=arctan((B͞D sin(ϕ₃))/(A͞B-(B͞D cos(ϕ₃)))).
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