Foldable golf cart

A foldable golf cart, comprising

• an upper and a lower joining member, each joining member including:
• (a) an intermediate connecting part having teeth arranged in radial patterns on left and right ends thereof, the intermediate connecting part having a central through hole extending from the left end to the right end;
• (b) a left connecting part arranged next to the left end of the intermediate connecting part, the left connecting part having teeth arranged in radial patterns on a right side and opposing the teeth of the intermediate connecting part, the left connecting part having a through hole extending from the right side to a left side;
• (c) a right connecting part arranged next to the right end of the intermediate connecting part, the right connecting part having teeth arranged in radial patterns on a left side and opposing the teeth of the intermediate connecting part, the right connecting part having a horizontally extending right tube portion, the right connecting part having a through hole extending from a right end of the right tube portion to the left side, the right tube portion of the right connecting part having two spaced stopping protrusions projecting from the right end of the right tube portion, the right tube portion having two slopes between the stopping protrusions;
• (d) a knob having a holding tube, and an insertion tube received in and coaxial with the holding tube thereof, the knob being connected to the right connecting part in an angularly displaceable manner with the holding tube being positioned around the right tube portion of the right connecting part, and with the insertion tube being inserted in the through hole of the right connecting part, a pivotal bolt inserted through the insertion tube of the knob and the through holes of the right, the intermediate and the left connecting parts;
• two main support rods respectively securely connected to the left and the right connecting parts of the upper joining member and respectively securely connected to the left and the right connecting parts of the lower joining member;
• a connecting element secured to a middle portion of each of the main support rods;
• two rear wheels, each of the rear wheels having a pair of supports pivoted to the connecting element at upper ends thereof;
• a handle rod is securely connected to the intermediate connecting part of the upper joining member at a lower end;
• two co-moving rods pivoted to the handle rod at upper ends of the co-moving rods, and respectively pivoted to the rear wheel supports at lower ends of the co-moving rods;
• and
• a front wheel securely connected to the intermediate connecting part of the lower joining member at a support thereof;
• the knob having two spaced stopping protrusions between both the holding tube and the insertion tube thereof, the knob having two slopes between the stopping protrusions thereof;
• the knob being connected to the right connecting part with the stopping protrusions thereof contacting respective ones of the slopes of the right connecting part, the knob being capable of making the left and the right connecting parts move close to the intermediate connecting part for the teeth of the left and right connecting parts to engage the teeth of the intermediate connecting part to block angular displacement of the left and the right connecting parts relative to the intermediate connecting part when the knob is turned to such a position in which the stopping protrusions thereof contact upper ends of the slopes of the right connecting part, and the stopping protrusions of the right connecting part contact upper ends of the slopes thereof, space being provided between the left and the right connecting parts and the intermediate connecting part for allowing angular displacement of the left and the right connecting parts relative to the intermediate connecting part by means of turning the knob to such a position in which the stopping protrusions of the knob contact lower ends of the slopes of the right connecting part, and the stopping protrusions of the right connecting part contact lower ends of the slopes of the knob.