A folding ball trolley having a minimized volume has a frame, a bag and multiple resilient elements. The frame has four stand rods, four top seats, four sliding seats, four wheels, four connecting rod assemblies and four mounting rods. The bag connects to the mounting rods, and the mounting rods piv
A folding ball trolley having a minimized volume has a frame, a bag and multiple resilient elements. The frame has four stand rods, four top seats, four sliding seats, four wheels, four connecting rod assemblies and four mounting rods. The bag connects to the mounting rods, and the mounting rods pivotally connect to the stand rods. Accordingly, the mounting rods can be rotated relative to the stand rods, such that the mounting rods do not protrude upward to occupy too much space when the ball trolley is folded. Besides, the frame is braced by the resilient elements so a user does not have to stretch his hands between the rods when folding the ball trolley, thereby preventing the hands from being clamped.
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1. A folding ball trolley having minimized volume, comprising: a frame having: four stand rods arranged in a rectangle;four top seats respectively mounted on top ends of the four stand rods;four sliding seats respectively mounted movably on the four stand rods;four wheels respectively mounted on bot
1. A folding ball trolley having minimized volume, comprising: a frame having: four stand rods arranged in a rectangle;four top seats respectively mounted on top ends of the four stand rods;four sliding seats respectively mounted movably on the four stand rods;four wheels respectively mounted on bottom ends of the four stand rods;four connecting rod assemblies, each connecting rod assembly mounted between two adjacent stand rods; andfour mounting rods respectively and pivotally connecting to the four top seats, with each mounting rod pivotal between a folded position intermediate a corresponding top seat and a corresponding wheel and an expanded position extending at an obtuse angle relative to the corresponding stand rod and outward of the frame;a bag mounted on the frame, connecting to the four mounting rods and having a room and an opening; andmultiple resilient elements mounted on the frame and bracing the frame. 2. The folding ball trolley as claimed in claim 1, wherein two ends of each resilient element respectively connect to the top seat and the sliding seat on a same stand rod. 3. The folding ball trolley as claimed in claim 1, wherein the multiple resilient elements are springs. 4. The folding ball trolley as claimed in claim 1, wherein: the bag has: a first outside surface;a second outside surface opposite to the first outside surface; andfour mounting segments;two of the four mounting segments are mounted facing to each other on the first outside surface;another two of the four mounting segments mounted facing to each other on the second outside surface;each mounting segment is elongated, inclined downward from an outside end to an inside end and has an inner cavity and an opening;the four mounting rods are respectively mounted in the four mounting segments of the bag; andeach mounting segment is inclined downward relative to the corresponding stand rod at the obtuse angle. 5. The folding ball trolley as claimed in claim 1, wherein: two of the four top seats are mounted facing to each other and another two of the four top seats are mounted facing to each other;each top seat has an abutting surface inclined downward from outside to inside at the obtuse angle to the corresponding stand rod; andeach mounting rod selectively abuts the abutting surface of a corresponding top seat. 6. The folding ball trolley as claimed in claim 1, wherein: each top seat has: two pivoting walls formed with an interval between each other; andtwo positioning points respectively formed on opposite inside surfaces of the two pivoting walls; andeach mounting rod is mounted between the two pivoting walls of a corresponding top seat and has two positioning recesses respectively formed in opposite outside surfaces of the mounting rod and respectively and selectively engaging the two positioning points of the corresponding top seat in the expanded position. 7. The folding ball trolley as claimed in claim 1, wherein an outline of the bag is rectangular. 8. The folding ball trolley as claimed in claim 1, wherein the bag further has a bottom room formed in a bottom of the room of the bag. 9. The folding ball trolley as claimed in claim 1 further comprising a fastening belt mounted on the frame and selectively surrounding and fastening the frame. 10. The folding ball trolley as claimed in claim 2, wherein the multiple resilient elements are springs. 11. The folding ball trolley as claimed in claim 10, wherein: the bag has: a first outside surface;a second outside surface opposite to the first outside surface; andfour mounting segments;two of the four mounting segments are mounted facing to each other on the first outside surface;another two of the four mounting segments mounted facing to each other on the second outside surface;each mounting segment is elongated, inclined downward from an outside end to an inside end and has an inner cavity and an opening;the four mounting rods are respectively mounted in the four mounting segments of the bag; andeach mounting segment is inclined downward relative to the corresponding stand rod at the obtuse angle. 12. The folding ball trolley as claimed in claim 11, wherein: two of the four top seats are mounted facing to each other and another two of the four top seats are mounted facing to each other;each top seat has an abutting surface inclined downward from outside to inside at the obtuse angle to the corresponding stand rod; andeach mounting rod selectively abuts the abutting surface of a corresponding top seat. 13. The folding ball trolley as claimed in claim 12, wherein: each top seat has: two pivoting walls formed with an interval between each other; andtwo positioning points respectively formed on opposite inside surfaces of the two pivoting walls; andeach mounting rod is mounted between the two pivoting walls of a corresponding top seat and has two positioning recesses respectively formed in opposite outside surfaces of the mounting rod and respectively and selectively engaging the two positioning points of the corresponding top seat in the expanded position. 14. The folding ball trolley as claimed in claim 13, wherein each connecting rod assembly has two connecting rods pivotally connecting each other, and wherein two ends of each connecting rod respectively and pivotally connecting to the top seat and the sliding seat on the two adjacent stand rods. 15. The folding ball trolley as claimed in claim 14, wherein an outline of the bag is rectangular. 16. The folding ball trolley as claimed in claim 7, wherein the room of the bag is cuboid. 17. The folding ball trolley as claimed in claim 15, wherein the room of the bag is cuboid. 18. The folding ball trolley as claimed in claim 17, wherein the bag further has a bottom room formed in a bottom of the room of the bag. 19. The folding ball trolley as claimed in claim 8, wherein the bag has a zipper mounted around an inside surface of the bottom room of the bag, with the zipper having: a connecting point defined on a vertical side of the bottom room;a lower zipper strip mounted around the inside surface of the bottom room, extending from the connecting point, extending downward obliquely to a bottom of the bottom room, and then surrounding the inside surface of the bottom room; andan upper zipper strip mounted around the inside surface of the bottom room, extending from the connecting point, extending upward obliquely, and then surrounding the inside surface of the bottom room. 20. The folding ball trolley as claimed in claim 18, wherein the bag has a zipper mounted around an inside surface of the bottom room of the bag, with the zipper having: a connecting point defined on a vertical side of the bottom room;a lower zipper strip mounted around the inside surface of the bottom room, extending from the connecting point, extending downward obliquely to a bottom of the bottom room, and then surrounding the inside surface of the bottom room; andan upper zipper strip mounted around the inside surface of the bottom room, extending from the connecting point, extending upward obliquely, and then surrounding the inside surface of the bottom room. 21. The folding ball trolley as claimed in claim 20 further comprising a fastening belt mounted on the frame and selectively surrounding and fastening the frame. 22. A folding ball trolley having minimized volume, comprising: a frame having: four stand rods arranged in a rectangle;four top seats respectively mounted on top ends of the four stand rods;four sliding seats respectively mounted movably on the four stand rods;four wheels respectively mounted on bottom ends of the four stand rods;four connecting rod assemblies, each connecting rod assembly mounted between two adjacent stand rods; andfour mounting rods respectively and pivotally connecting to the four top seats;a bag mounted on the frame, connecting to the four mounting rods and having a room and an opening; andmultiple resilient elements mounted on the frame and bracing the frame, wherein each connecting rod assembly has two connecting rods pivotally connecting each other, and wherein two ends of each connecting rod respectively and pivotally connecting to the top seat and the sliding seat on the two adjacent stand rods.
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