Bicycle with toothing
Homemade sent by: Herman Izmalkov 
Description: The bicycle has a frame on which are mounted on the rods around the centers of their initial circles a pair of toothed crowns made in the form of arcs connected by gear engagement with the rear wheel through the sleeves having a connection with the wheel through the free-wheeling mechanisms of one operating direction, both of these engagement Identical, the axes of these rods of the gear rims on which they rotate on the frame have a rigid connection with the brackets with the pedals and at the same time these consoles are connected with each other by a flexible coupling, for example, a cable, which It passes through the unit, mounted on the frame with the possibility of rotation. 
A similar bicycle in action:
