US Patent 11225277 Double-cross cart

A double-cross cart comprises two side wall assemblies, a front wall assembly, a rear wall assembly, a bottom frame assembly, a draw bar assembly and four wheels. A front end and a rear end of the bottom frame assembly are rotatably connected to a lower end of the front wall assembly and a lower end of the rear wall assembly, respectively. The draw bar assembly is rotatably connected to the rear wall assembly. The four wheels are arranged at the lower end of the front wall assembly and the lower end of the rear wall assembly. Each side wall assembly is a double-cross structure composed of two X-shaped connecting rods that are hinged together.