Effort-saving bicycle and transmission crank

Abstract

This invention provides an effort-saving bicycle and transmission cranks comprising: a frame; two wheels pivotably disposed respectively on a front side and rear side of a lower portion of the frame; a gear-driving disc pivotably disposed proximate to a central portion of a lower portion of the frame; a handlebar installed on a front side of an upper portion of the frame; a seat pad installed proximate to a central portion of an upper portion of the frame; two cranks each of which having one end pivotably disposed at a transmission axle of two sides of the gear-driving disc; two pedals pivotably disposed respectively on the other ends of the two cranks. A force-applied point of the crank may in advance effectively pass through an upper death point and defer passing through a lower death point upon performing a circumferential stepping movement at the pedals, and eliminating a death angle coming from a maximum force-applied point upon performing a circumferential stepping movement at the pedals.

Dependencies are inferred from the claim text.