A folding ball trolley has a frame and a bag. The frame has two main rod assemblies and two connecting rod assemblies. When the folding ball trolley is expanded, the main rods and the connecting rods lean outward under gravity until the main rods brace the bag. The bag holds the main rods at a speci
A folding ball trolley has a frame and a bag. The frame has two main rod assemblies and two connecting rod assemblies. When the folding ball trolley is expanded, the main rods and the connecting rods lean outward under gravity until the main rods brace the bag. The bag holds the main rods at a specific angle, and the main rods hold the connecting rods at a specific angle. The main rod assemblies and the connecting rod assemblies are connected into a rectangle, such that the frame is expanded horizontally when the rods are leant outward. Thus, the folding ball trolley can achieve auto expansion without any resilient element, and therefore a user does not have to resist the resilient force when folding. Besides, the amount of the rods is reduced to eight (four main rods and four connecting rods), which reduces the manufacturing cost and facilitates ease of assembly.
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1. A folding ball trolley comprising: a frame having two main rod assemblies arranged apart from each other; each main rod assembly having two main rods pivotally connected to each other;four top seats respectively and pivotally mounted on the four main rods of the main rod assemblies;four bottom se
1. A folding ball trolley comprising: a frame having two main rod assemblies arranged apart from each other; each main rod assembly having two main rods pivotally connected to each other;four top seats respectively and pivotally mounted on the four main rods of the main rod assemblies;four bottom seats respectively and pivotally mounted on the four main rods of the main rod assemblies, and disposed below the top seats;two connecting rod assemblies mounted between the main rod assemblies, and arranged apart from each other; the main rod assemblies and the connecting rod assemblies connected into a rectangle; each connecting rod assembly having two connecting rods pivotally connected to each other; each connecting rod having a top end pivotally connected to one of the top seats on one of the main rod assemblies; anda bottom end pivotally connected to one of the bottom seats on the other main rod assembly; andfour wheels respectively mounted on bottom ends of the four main rods of the main rod assemblies; anda bag mounted on the frame, connected to the main rods of the main rod assemblies, and having an inner space and an opening;whereineach top seat has a top abutting surface inclined downward, and selectively abutting the main rod on which the top seat is mounted; andeach bottom seat has a bottom abutting surface inclined upward, and selectively abutting the main rod on which the bottom seat is mounted. 2. A folding ball trolley comprising: a frame having two main rod assemblies arranged apart from each other; each main rod assembly having two main rods pivotally connected to each other;four top seats respectively and pivotally mounted on the four main rods of the main rod assemblies;four bottom seats respectively and pivotally mounted on the four main rods of the main rod assemblies, and disposed below the top seats;two connecting rod assemblies mounted between the main rod assemblies, and arranged apart from each other; the main rod assemblies and the connecting rod assemblies connected into a rectangle; each connecting rod assembly having two connecting rods pivotally connected to each other; each connecting rod having a top end pivotally connected to one of the top seats on one of the main rod assemblies; anda bottom end pivotally connected to one of the bottom seats on the other main rod assembly; andfour wheels respectively mounted on bottom ends of the four main rods of the main rod assemblies; anda bag mounted on the frame, connected to the main rods of the main rod assemblies, and having an inner space and an opening;whereineach top seat has a top abutting surface inclined downward, and selectively abutting the connecting rod connected to the top seat; andeach bottom seat has a bottom abutting surface inclined upward, and selectively abutting the connecting rod connected to the bottom seat. 3. A folding ball trolley comprising: a frame having two main rod assemblies arranged apart from each other; each main rod assembly having two main rods pivotally connected to each other;four top seats respectively and pivotally mounted on the four main rods of the main rod assemblies;four bottom seats respectively and pivotally mounted on the four main rods of the main rod assemblies, and disposed below the top seats;two connecting rod assemblies mounted between the main rod assemblies, and arranged apart from each other; the main rod assemblies and the connecting rod assemblies connected into a rectangle; each connecting rod assembly having two connecting rods pivotally connected to each other; each connecting rod having a top end pivotally connected to one of the top seats on one of the main rod assemblies; anda bottom end pivotally connected to one of the bottom seats on the other main rod assembly; andfour wheels respectively mounted on bottom ends of the four main rods of the main rod assemblies; anda bag mounted on the frame, connected to the main rods of the main rod assemblies, and having an inner space and an opening;whereineach top seat has two top abutting surfaces inclined downward; one of the top abutting surfaces selectively abutting the main rod on which the top seat is mounted; the other top abutting surface selectively abutting the connecting rod connected to the top seat; andeach bottom seat has two bottom abutting surfaces inclined upward; one of the bottom abutting surfaces selectively abutting the main rod on which the bottom seat is mounted; the other bottom abutting surface selectively abutting the connecting rod connected to the bottom seat. 4. The folding ball trolley as claimed in claim 3, wherein each top seat has four pivot walls; two of the pivot walls of the top seat respectively disposed in opposite sides of one of the top abutting surfaces, and pivotally connected to the main rod on which the top seat is mounted; the other two pivot walls of the top seat respectively disposed in opposite sides of the other top abutting surface, and pivotally connected to the connecting rod connected to the top seat; andeach bottom seat has four pivot walls; two of the pivot walls of the bottom seat respectively disposed in opposite sides of one of the bottom abutting surfaces, and pivotally connected to the main rod on which the bottom seat is mounted; the other two pivot walls of the bottom seat respectively disposed in opposite sides of the other bottom abutting surface, and pivotally connected to the connecting rod connected to the bottom seat. 5. The folding ball trolley as claimed in claim 3, wherein each top seat has a top long segment and a top short segment perpendicularly connected to each other; the top abutting surfaces of the top seat are respectively disposed in an end of the top long segment and an end of the top short segment; the four top seats respectively are two first top seats and two second top seats; the first top seats are disposed diagonally opposite to each other; the second top seats are disposed diagonally opposite to each other;the top long segment and the top short segment of each first top seat are respectively and pivotally connected to the main rod on which the first top seat is mounted and the connecting rod connected to the first top seat;the top long segment and the top short segment of each second top seat are respectively and pivotally connected to the connecting rod connected to the second top seat and the main rod on which the second top seat is mounted;each bottom seat has a bottom long segment and a bottom short segment perpendicularly connected to each other; the bottom abutting surfaces of the bottom seat are respectively disposed in an end of the bottom long segment and an end of the bottom short segment; the four bottom seats respectively are two first bottom seats and two second bottom seats; the first bottom seats are disposed diagonally opposite to each other; the second bottom seats are disposed diagonally opposite to each other;the bottom long segment and the bottom short segment of each first bottom seat are respectively and pivotally connected to the connecting rod connected to the first bottom seat and the main rod on which the first bottom seat is mounted;the bottom long segment and the bottom short segment of each second bottom seat are respectively and pivotally connected to the main rod on which the second bottom seat is mounted and the connecting rod connected to the second bottom seat; andthe first top seats are respectively disposed aligned with and above the first bottom seats. 6. The folding ball trolley as claimed in claim 4, wherein each top seat has a top long segment and a top short segment perpendicularly connected to each other; the top abutting surfaces of the top seat are respectively disposed in an end of the top long segment and an end of the top short segment; the four top seats respectively are two first top seats and two second top seats; the first top seats are disposed diagonally opposite to each other; the second top seats are disposed diagonally opposite to each other;the top long segment and the top short segment of each first top seat are respectively and pivotally connected to the main rod on which the first top seat is mounted and the connecting rod connected to the first top seat;the top long segment and the top short segment of each second top seat are respectively and pivotally connected to the connecting rod connected to the second top seat and the main rod on which the second top seat is mounted;each bottom seat has a bottom long segment and a bottom short segment perpendicularly connected to each other; the bottom abutting surfaces of the bottom seat are respectively disposed in an end of the bottom long segment and an end of the bottom short segment; the four bottom seats respectively are two first bottom seats and two second bottom seats; the first bottom seats are disposed diagonally opposite to each other; the second bottom seats are disposed diagonally opposite to each other;the bottom long segment and the bottom short segment of each first bottom seat are respectively and pivotally connected to the connecting rod connected to the first bottom seat and the main rod on which the first bottom seat is mounted;the bottom long segment and the bottom short segment of each second bottom seat are respectively and pivotally connected to the main rod on which the second bottom seat is mounted and the connecting rod connected to the second bottom seat; andthe first top seats are respectively disposed aligned with and above the first bottom seats. 7. The folding ball trolley as claimed in claim 3, wherein the top seats and the bottom seats are the same in structure. 8. The folding ball trolley as claimed in claim 6, wherein the top seats and the bottom seats are the same in structure. 9. The folding ball trolley as claimed in claim 3 further comprising two engaging rod assemblies respectively mounted on the connecting rod assemblies; each engaging rod assembly having two engaging rods and an engager; outer ends of the engaging rods respectively and pivotally connected to the connecting rods of the connecting rod assembly; inner ends of the engaging rods pivotally connected to each other; the engager pivotally connected to one of the engaging rods, and selectively engaging with the other engaging rod. 10. The folding ball trolley as claimed in claim 8 further comprising two engaging rod assemblies respectively mounted on the connecting rod assemblies; each engaging rod assembly having two engaging rods and an engager; outer ends of the engaging rods respectively and pivotally connected to the connecting rods of the connecting rod assembly; inner ends of the engaging rods pivotally connected to each other; the engager pivotally connected to one of the engaging rods, and selectively engaging with the other engaging rod. 11. The folding ball trolley as claimed in claim 3, wherein the main rods and the connecting rods are square tubes. 12. The folding ball trolley as claimed in claim 10, wherein the main rods and the connecting rods are square tubes. 13. The folding ball trolley as claimed in claim 3, wherein the main rods and the connecting rods are made by aluminum extrusion. 14. The folding ball trolley as claimed in claim 12, wherein the main rods and the connecting rods are made by aluminum extrusion. 15. The folding ball trolley as claimed in claim 3, wherein the bag has a first outer surface;a second outer surface opposite to the first outer surface; andfour mounting segments; two of the mounting segments mounted facing to each other on the first outer surface; the other two mounting segments mounted facing to each other on the second outer surface; each mounting segment being elongated, inclined downward from an outer end to an inner end and having an inner space and an opening; andthe main rods are respectively mounted in the mounting segments of the bag. 16. The folding ball trolley as claimed in claim 14, wherein the bag has a first outer surface;a second outer surface opposite to the first outer surface; andfour mounting segments; two of the mounting segments mounted facing to each other on the first outer surface; the other two mounting segments mounted facing to each other on the second outer surface; each mounting segment being elongated, inclined downward from an outer end to an inner end and having an inner space and an opening; andthe main rods are respectively mounted in the mounting segments of the bag. 17. The folding ball trolley as claimed in claim 3 further comprising a fastening belt mounted on the bag and selectively surrounding and fastening the four main rods of the frame. 18. The folding ball trolley as claimed in claim 16 further comprising a fastening belt mounted on the bag and selectively surrounding and fastening the four main rods of the frame.
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