Four-wheeled folding handcart

A four-wheeled folding handcart, comprising:

• a main body;
• and
• a loading plate for loading an article thereon, said loading plate provided with at least one loading plate wheel unit at a lower portion thereof, connected to the main body via a hinge unit such that the loading plate is folded by the hinge unit while being rotated toward the main body,
• wherein the loading plate wheel unit is connected to a wheel rod rotated by the rotation of the hinge unit in a direction perpendicular to a rotational direction of the hinge unit,
• the loading plate wheel unit is configured such that, when the loading plate is rotated and folded toward the main body, the loading plate wheel unit is rotated and folded toward a bottom surface of the loading plate as the wheel rod rotates, and
• the loading plate wheel unit is configured such that, when the loading plate is rotated and unfolded in the direction perpendicular to the main body, the loading plate wheel unit is rotated and unfolded in a direction perpendicular to the loading plate as the wheel rod rotates reversely, and
• wherein the wheel rod is provided with a vertical protrusion protruding from a portion thereof vertically and rotating the wheel rod in accordance with the rotation of the hinge unit, and
• the main body is provided with a guide recess having a shape in which the vertical protrusion is inserted and corresponding to a rotation path of the vertical protrusion such that the loading plate wheel unit is folded toward the bottom surface of the loading plate or unfolded in the direction perpendicular to the loading plate by rotation of the vertical protrusion.

A four-wheeled folding handcart, comprising:

• a main body;
• and
• a loading plate for loading an article thereon, said loading plate provided with at least one loading plate wheel unit at a lower portion thereof, connected to the main body via a hinge unit such that the loading plate is folded by the hinge unit while being rotated toward the main body,
• wherein the loading plate wheel unit is connected to a wheel rod rotated by the rotation of the hinge unit in a direction perpendicular to a rotational direction of the hinge unit,
• the loading plate wheel unit is configured such that, when the loading plate is rotated and folded toward the main body, the loading plate wheel unit is rotated and folded toward a bottom surface of the loading plate as the wheel rod rotates,
• the loading plate wheel unit is configured such that, when the loading plate is rotated and unfolded in the direction perpendicular to the main body, the loading plate wheel unit is rotated and unfolded in a direction perpendicular to the loading plate as the wheel rod rotates reversely,
• the wheel rod is provided with a vertical protrusion protruding from a portion thereof vertically and rotating the wheel rod in accordance with the rotation of the hinge unit,
• the main body is provided with a guide recess having a shape in which the vertical protrusion is inserted such that the loading plate wheel unit is unfolded in the direction perpendicular to the loading plate by rotation of the vertical protrusion, and
• the wheel rod is provided with a wheel rod spring such that the loading plate wheel unit is folded toward the bottom surface of the loading plate as the wheel rod is rotated by an elastic force of the wheel rod spring.