Patent ID: 7618351

Claim:
A pedal exercise machine having an arc trajectory, comprising: a base; a front frame and a center frame provided on the base, the front frame and the center frame being coupled to each other; a pair of pedals to move upwards and downwards in alternating directions; a pedal link for connecting each of the pedals to the base; a subsidiary pedal link for connecting each of the pedals to the center frame, the subsidiary pedal link being coupled to the pedal by a first shaft different from a second shaft, through which the corresponding pedal link is coupled to the corresponding pedal; a resistance pulley provided in the center frame; a crank shaft coupled to the resistance pulley, the crank shaft being provided with crank arms, each of which has a length adjustment mechanism; and a crank link unit for connecting each of the pedal links to the corresponding crank arm of the crank shaft, the crank link unit having an angle adjustment mechanism configured to adjust an angle between the corresponding pedal link and the corresponding crank link unit around a base-side shaft of the pedal link; wherein the crank link unit comprises: a first crank link coupled to the corresponding pedal link at a predetermined angle; and a second crank link coupled at respective opposite ends thereof to the first crank link and the corresponding crank arm; and whereby adjusting an angle between the corresponding pedal link and the corresponding crank link unit adjusts a trajectory of one of the pedals.