Driving mechanism for bicycles - has telescopic cranks connected to sprocket wheel on frame

摘要

The driving mechanism has two cranks. These are arranged, so that in the front pressure movement downwards. the crank is longer, to make cycling easier. A drive plate (1), elliptical towards the front, is fastened to either side of the frame. There are double telescopic cranks (2), each consisting of a lower arm and an upper arm (2A,B), which moves to and fro in the lower arm. Each lower arm carries a running roller (5), moving over the drive plate, and extending the telescopic arms. The two arms are connected by a traction spring. USE - Drive mechanism for pedal bicycle using telescopic cranks.