Transfer trolley and outdoor transfer device

A transfer trolley, comprising:

• a frame, having a structure of being folded or unfolded in a width direction;
• casters, fixed to bottom of the frame;
• a drag rod, one end of the drag rod being rotary fixed to one end in a length direction of the frame, and the other end of the drag rod being flipped upwardly or downwardly around the one end of the drag rod that is rotationally connected with the frame;
• and
• constraint components, fixed to and cooperating with the frame to allow the frame in a locked state of keeping unfolded or an unlocked state of being folded in the width direction;
• wherein the frame comprises:
• a pair of bracing pieces, arranged opposite each other, wherein the casters are two pairs and two casters opposite each other are fixed to lower parts of both ends of the bracing pieces;
• and
• connective components, connected to the bracing pieces and capable of moving the bracing pieces to fold or unfold the frame along the width direction;
• and
• wherein one end of the bracing pieces is rotary connected to one end of the connective components or one of the bracing pieces, the constraint components are connected with the bracing pieces and cooperate with the connective components to allow the frame in the locked state of keeping unfolded or the unlocked state of being folded in the width direction;
• wherein the pair of bracing pieces extend horizontally and are arranged parallel to each other or crosswise, and in case of the bracing pieces are arranged crosswise, middle of the bracing pieces is connected by a connecting shaft in a scissor rotation, and the connective components comprises,
• a pair of first traction rods, corresponding with the bracing pieces one to one, wherein one end of the first traction rods is rotary connected with one end of the bracing pieces;
• and
• a connecting base, provided between the pair of the first traction rods, wherein the other end of the first traction rods is rotary connected with the connecting base;
• and
• wherein one end of the drag rod is connected with the connecting base by means of a rotor, and the other end of the drag rod is flipped upwardly or downwardly around the one end of the drag rod that is rotationally connected with the connecting base.