Patent ID: 8919798

Claim:
A foldable bicycle frame comprising: a front arm; an intermediate arm having a front end pivotally attached to a rear end the front arm such that the front arm can pivot about a hinge shaft positioned proximate to a lower side of the rear end of the front arm; an intermediate tube affixed to the intermediate arm; a rear fork pivotally attached to the intermediate tube; a seat tube slidably sleeved inside the intermediate tube, a lower end of the seat tube extending out of a lower end of the intermediate tube; a connecting rod seat positioned proximate to the lower end of the seat tube, the connecting rod seat comprises a first sidewall extending toward the front of the bicycle frame and two lugs extending toward the rear of the bicycle frame; a front connecting rod comprising: a first joint bearing at the front end of the front connecting rod, the first joint bearing being rotatably attached to a fixing seat located on a lower side of the front arm; and a second joint bearing at the rear end of the front connecting rod, the second joint bearing being rotatably attached to the first sidewall on the connecting rod seat; a rear connecting rod comprising: a front joint bearing at the front end of the rear connecting rod, the front joint bearing being rotatably attached to at least one of the two projecting lugs on the connecting rod seat; and a rear joint bearing at the rear end of the rear connecting rod, the rear joint bearing being rotatably attached proximate to a rear end of the rear fork.