US 12,358,545 B2
Folding cart
Yuanru Sun, Zhejiang (CN); Chao Zeng, Zhejiang (CN); and Jian He, Zhejiang (CN)
Assigned to ZHEJIANG JIANSHENG LEISURE PRODUCTS CO., LTD, Zhejiang (CN)
Filed by ZHEJIANG JIANSHENG LEISURE PRODUCTS CO., LTD, Zhejiang (CN)
Filed on Jul. 10, 2022, as Appl. No. 17/861,239.
Application 17/861,239 is a continuation in part of application No. 17/137,367, filed on Dec. 30, 2020, granted, now 11,932,298.
Application 17/137,367 is a continuation in part of application No. PCT/CN2020/116444, filed on Sep. 21, 2020.
Claims priority of application No. 201921755041.6 (CN), filed on Oct. 18, 2019.
Prior Publication US 2022/0340183 A1, Oct. 27, 2022
Int. Cl. B62B 3/02 (2006.01); B62B 5/06 (2006.01)
CPC B62B 3/02 (2013.01) [B62B 5/067 (2013.01); B62B 2205/06 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A folding cart, comprising a frame body and a wheel assembly located at a lower part of the frame body, wherein a pull rod assembly is arranged on the frame body in a matched manner; the frame body comprises a bottom frame assembly and a side frame assembly, and the bottom frame assembly and the side frame assembly is able to be folded or unfolded; the side frame assembly comprises a plurality of side rail units and a plurality of leg tube assemblies for connecting adjacent two of the side rail units; each of the leg tube assemblies comprises a leg tube body, an upper leg tube seat located at an upper part of the leg tube body, and a lower leg tube seat located at a lower part of the leg tube body; and the wheel assembly comprises a plurality of wheel units, and the wheel units are configured to be detachably and fixedly installed to the lower leg tube seats of the leg tube assemblies by first locking and fixing mechanisms,
wherein the pull rod assembly comprises a pull rod body, a pull rod seat and connecting rods; each of the connecting rods has one end hingedly matched with the pull rod seat and the other end hingedly matched with the lower leg tube seat of the corresponding one of the leg tube assemblies; the pull rod seat is installed on the pull rod body in a sleeved manner, and the pull rod seat is movable along the pull rod body; and the pull rod seat is provided with a second locking and fixing mechanism, and the pull rod seat is matchable with the pull rod body in a locked and fixed manner by the second locking and fixing mechanism,
the pull rod body is formed with at least one locking hole; the second locking and fixing mechanism comprises a second locking block and a second reset piece; the second locking block is formed with a pull rod through hole; a side wall of the pull rod through hole is provided with a pull rod locking block, and the pull rod locking block is configured to match with the locking hole; and the pull rod body penetrates the pull rod through hole,
upper parts between the adjacent two of the side rail units are installed in cooperation by a connecting seat, and the connecting seat is suspended at an upper part of the leg tube assembly and is adjacent to a central area relative to the upper leg tube seat; and when the frame body is in a folded state, an upper folded size of the side frame assembly is smaller than a lower folded size of the side frame assembly.