Patent ID: 8752893

Claim:
A seat post of a bicycle, comprising: an adjusting tube; a first pulley pivotally disposed in the adjusting tube; a pushing member having a first end and a second end, wherein the first end of the pushing member is coaxially disposed in the adjusting tube; a main tube connected to the bicycle, wherein the second end of the pushing member is connected to the main tube, and the adjusting tube is axially movable in the main tube; an adjusting mechanism comprising, in order from the first end to the second end of the pushing member: a second pulley pivotally connected to the pushing member and being axially movable along the pushing member; a third pulley pivotally connected to the pushing member; and a fourth pulley pivotally and coaxially connected to the pushing member and the adjusting tube; an elastic member connected to the adjusting mechanism; and a cord comprising: a base segment wound around the first pulley and the second pulley; and a feed segment wound around the third pulley and the fourth pulley; wherein the second end of the pushing member is movable outwardly from the adjusting tube by the elastic member pushing the adjusting mechanism, so that the second pulley is axially movable with a base displacement relative to the adjusting tube, and the fourth pulley is axially movable along the pushing member with a feed displacement.