Foldable cart

A foldable cart, comprising:

• a handle assembly having an upper end and a lower end;
• a foldable cart frame having a front side and a rear side, comprising four vertical rods each having a bottom end, and a wheel frame assembly;
• a plurality of wheels connected to the wheel frame assembly;
• a storage bag connected to the foldable cart frame;
• wherein,
• the bottom end of each vertical rod is connected to the wheel frame assembly, two of the four vertical rods form a frontal pair of vertical rods and are located at the front side of the foldable cart frame and the other two of the four vertical rods form a rear pair of vertical rods and are located at the rear side of the foldable cart frame, both the frontal pair and rear pair of vertical rods are connected to a corresponding pair of crossed rotatable drawing rods such that the vertical rods of each pair can move closer to or further away from each other;
• the wheel frame assembly having four corners is in an X-shaped foldable structure, the bottom end of each vertical rod is connected to one of each of the four corners of the wheel frame assembly, and the cart frame is capable of being folded or opened through folding or opening of the wheel frame assembly;
• the wheel frame assembly comprises an upper nest, a lower nest, four long rods each having a first end, a second end and a middle portion, four corresponding short rods having a first end and a second end, four corresponding support rods having a first end and a second end and four corresponding joints having an upper portion, a lower portion and a bottom;
• each wheel is mounted under a corresponding corner of the wheel frame assembly, the storage bag is connected to the four vertical rods, the handle assembly is arranged at the front or rear side of the cart frame, and, the lower end of the handle assembly is rotatably connected to the bottom ends of the two vertical rods on the corresponding side of the cart frame and is foldable with the two vertical rods;
• the first end of each long rod is pivotally attached to the upper nest and the second end thereof is pivotally attached to the upper portion of the corresponding joint, the first end of each corresponding short rod is pivotally attached to the middle portion of the corresponding long rod and the second end thereof is pivotally attached to the lower nest, the first end of each support rod is pivotally attached to the lower portion of the corresponding joint and the second end thereof is pivotally attached to the corresponding short rod, each wheel is mounted on the bottom of the corresponding joint.