Patent ID: 8628102
Filing Date: 2014-01-14
Classification: B62M,Y10T

Abstract:
1. An extended crank system suitable for powering a crank-driven transportation machine comprising a frame a bottom bracket mounted to the frame; a pair of cranks operatively connected to and extending from opposite ends of the bottom bracket; a chain ring operatively connected to one of the cranks; a top bracket mounted to the frame; a pair of crank hubs rotatably connected to each of the cranks and extending away from and parallel to an axis of the bottom bracket; a pair of crank extensions connected to the pair of crank hubs, respectively; a pair of crank extension hubs connected to the pair of crank extensions, respectively; and a pair of crank followers each pivotably connected to a respective one of the crank extension hubs at respective first ends of the crank followers and pivotably connected to opposite ends of the top bracket at respective second ends of the crank followers.