Patent ID: 8596653

Claim:
A two-fold four-wheel golf bag cart folding device, comprising: a golf bag; a lower cart frame having a connecting plate installed at an upper end of the lower cart frame and a lower supporting base immovably fixed at a lower end of the lower cart frame, with the lower supporting base defining an axis extending perpendicular to the lower cart frame; an upper cart frame having a lower end partially coupled to the connecting plate and having an upper supporting base and a handle module at an upper end, wherein the upper supporting base and the lower supporting base are fixed to the golf bag; a rear wheel stand mounted on both sides of the connecting plate and having a rear wheel; a pull rod having an end coupled to the handle module and another end coupled to the rear wheel stand; a front wheel set having two front wheels installed on both sides of the lower supporting base respectively; a locking mechanism installed between an upper end of the upper cart frame and a lower end of the handle module, with the locking mechanism fixing an angle between the upper cart frame and the handle module; and a four-link-rod mechanism installed among the handle module, the rear wheel stand and the pull rod, wherein the lower and upper cart frames, the rear wheel stands, and the pull rod is moveable between a folded position and an unfolded position, with the handle module extending at an acute angle relative to the upper cart frame in the folded position and extending at an obtuse angle relative to the upper cart frame in the unfolded position, wherein the front and rear wheels touch the ground simultaneously as the lower and upper cart frames, the pull rod, and the rear wheel stands move between the folded and unfolded positions, and wherein the golf bag is attached onto the upper and lower cart frames and remains erect without being toppled when the upper and lower cart frames, the handle module, and the rear wheel stands move between the folded and unfolded positions.