Patent ID: 8235397

Claim:
An exercise bicycle comprising: a cushioning body having a front frame disposed on a front end of a cushioning frame, and having a handlebar rotatably mounted on a front end of the front frame; a front wheel rotatably mounted on a bottom of the handlebar; and a saddle mounted on a rear end of the front frame; and a rear frame disposed on a rear end of the cushioning frame, and having a fixed portion disposed on a front end of the rear frame; and an eccentric rear wheel eccentrically mounted on a rear end of the rear frame; and a pivot disposed between the front frame and the rear frame, and located in front of the fixed portion for pivotally connecting the front frame with the rear frame; and a suspension connected to the front frame and the rear frame; and an elastic driving device mounted in the fixed portion of the rear frame and having two casing pipes respectively fixed on two sides of the fixed portion of the rear frame, each casing pipe having a connecting portion disposed on a side of the casing pipe for fixing the casing pipe on one of the two sides of the fixed portion; two springs respectively received in the two casing pipes, and each spring having a bottom end abutting against an inner bottom of one of the casing pipes; two upper pedals respectively mounted on two tops of the two casing pipes; and two pedal assemblies respectively mounted on the two casing pipes, and each pedal assembly having a spindle inserted into one of the casing pipes and the spring received in the casing pipe, and having a spindle nut mounted on a top of the spindle for abutting against a top of the spring; and a connecting board disposed under the fixed portion of the rear frame and connecting the two spindles of the two pedal assemblies.