Patent ID: 8025303
Filing Date: 2011-09-27
Classification: B62M

Abstract:
1. A transmission system for a cycle comprising: a front frame that includes a frame head; a rear fork mounted on the frame head; a rear-frame top tube fixed onto the frame head and including a first axis Cx, transverse to the rear-frame top tube; one or more chainrings mounted to rotate on the first axis Cx transverse to the rear-frame top tube; two shafts, each having one end mounted on one end of the rear-frame top tube; pedal crank arms articulated at the other ends of the shafts that are not mounted to the rear-frame top tube; a chain intended to transmit power between a chainring and a cog cassette mounted on a rear wheel; and a coupling device between the pedal crank arms and the first axis Cx, transverse to the rear-frame top tube, to convert an alternating movement of the pedal crank arms into a rotational movement of the chainring transmitted to the rear wheel by means of the chain and the cog cassette.