Patent ID: 6880848

Claim:
A foldable bicycle comprising: a frame having a front end, a rear end, a head tube formed on the front end and a seat tube formed on the rear end; a front fork rotatably extending through the head tube and having a top and a bottom; a front wheel rotatable mounted on the bottom of the front fork by a front axle; a seat post extending through the seat tube and having a top with a seat; a rear fork having a proximal end pivotally attached to the frame and a rear end; a rear wheel rotatably mounted on the distal end of the rear fork; a drive assembly mounted between the rear fork and the rear wheel to rotate the rear wheel; a stem connected to the top of the front fork with a handlebar positioning device and having a bottom, the handlebar positioning device comprising: a bracket mounted on the top of the front fork and having a side and a longitudinal slot defined in the side of the bracket to form two wings on the side of the bracket; a locking pin mounted between the wings; a locking neck protruding from the bottom of the stem, mounted in the longitudinal slot in the bracket and having a distal end with a notch to selectively hold the locking pin and a longitudinally elongated transverse through hole longitudinally defined through the locking neck; and a handlebar quick-release device mounted on the bracket to hold the locking neck in the bracket and having: a compression pin extending through the wings and the longitudinally elongated transverse through hole in the locking neck and having a threaded distal end; a compression washer mounted around the compression pin near the thread distal end and abutting one of the wings of the bracket; and a compression lever attached to the threaded distal end of the compression pin and having an eccentric cam abutting the compression washer; a handlebar transversely mounted on the stem; and a shock absorber mounted between the frame and the rear fork and having a proximal end pivotally attached to the frame and a distal end connected to the rear fork by a rear fork positioning device, and the rear fork positioning device comprising: a U-shaped bracket securely attached to the rear fork and having two sides to hold the distal end of the shock absorber between the two sides; two through holes defined respectively in the two sides of the bracket; and two notches defined respectively in the sides of the bracket and communicating with a corresponding one of the through holes; and a shock absorber quick-release device mounted on the bracket to hold the distal end of the shock absorber in the bracket and having: a compression pin extending through the through holes in the sides of the bracket and the distal end of the shock absorber and having a threaded distal end; a compression washer mounted around the compression pin near the threaded distal end and abutting one of the sides of the bracket; and a compression lever attached to the threaded distal end of the compression pin and having an eccentric cam abutting the compression washer.