Abstract: Provided is a foldable box having a left part and a right part, the left and right parts which include a pair of left auxiliary plates and a pair of right auxiliary plates, respectively, and most of which is made of a hard material, and therefore, it is possible to protect an item stored therein from an external impact and easily fold or unfold the foldable box, thereby maximizing convenience of storage and use.

Abstract: Provided is a foldable box having a left part and a right part, the left and right parts which include a pair of left auxiliary plates and a pair of right auxiliary plates, respectively, and most of which is made of a hard material, and therefore, it is possible to protect an item stored therein from an external impact and easily fold or unfold the foldable box, thereby maximizing convenience of storage and use.

Abstract: Disclosed is a four-wheeled folding handcart, including: a main body; and a 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, and loading an article thereon. 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, the loading plate wheel unit is rotated and folded as the wheel rod rotates, and when the loading plate is rotated and unfolded, the loading plate wheel unit is rotated and unfolded as the wheel rod rotates reversely.

Abstract: Provided is a foldable box having a left part and a right part, the left and right parts which include a pair of left auxiliary plates and a pair of right auxiliary plates, respectively, and most of which is made of a hard material, and therefore, it is possible to protect an item stored therein from an external impact and easily fold or unfold the foldable box, thereby maximizing convenience of storage and use.

Abstract: A folding handcart includes: a main body provided with a supporter configured to extend vertically from a lower portion thereof; and a loading plate provided with at least one loading plate wheel unit, connected to the supporter of the main body through a hinge unit, folded while being rotated toward the main body by the hinge unit, and stowing an article or a folding box, wherein, when the loading plate is folded while being rotated toward the main body, a predetermined stowing space is provided between the main body and the loading plate in accordance with an area of the supporter such that the folding box is folded and stowed therein.

Abstract: Disclosed is a four-wheeled folding handcart, including: a main body; and a 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, and loading an article thereon. 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, the loading plate wheel unit is rotated and folded as the wheel rod rotates, and when the loading plate is rotated and unfolded, the loading plate wheel unit is rotated and unfolded as the wheel rod rotates reversely.

Abstract: A folding handcart includes: a main body provided with a supporter configured to extend vertically from a lower portion thereof; and a loading plate provided with at least one loading plate wheel unit, connected to the supporter of the main body through a hinge unit, folded while being rotated toward the main body by the hinge unit, and stowing an article or a folding box, wherein, when the loading plate is folded while being rotated toward the main body, a predetermined stowing space is provided between the main body and the loading plate in accordance with an area of the supporter such that the folding box is folded and stowed therein.

Abstract: A folding box that can be folded and unfolded easily and increases convenience in use, the folding box includes: a bottom part folded inward by at least one bottom folding means; a front side part connected to a front side of the bottom part; a rear side part connected to a rear side of the bottom part; a left side part connected to a left side of the bottom part, and folded inward by at least one left folding means; and a right side part connected to a right side of the bottom part, and folded inward by at least one right folding means, the left side part and the right side part each have a soft flexible side, so as to fold the bottom part inward when the left side part and the right side part are folded inward.

Abstract: A folding handcart includes: a main body provided with at least one wheel unit for moving at a lower portion thereof and provided with a supporter configured to extend vertically from the lower portion thereof; and a loading plate connected to the supporter of the main body through a hinge unit, folded while being rotated toward the main body by the hinge unit, and stowing an article or a folding box, wherein, when the loading plate is folded while being rotated toward the main body, a predetermined stowing space is provided between the main body and the loading plate in accordance with an area of the supporter such that the folding box is folded and stowed therein.

Abstract: A folding box that can be folded and unfolded easily and increases convenience in use, the folding box includes: a bottom part folded inward by at least one bottom folding means; a front side part connected to a front side of the bottom part; a rear side part connected to a rear side of the bottom part; a left side part connected to a left side of the bottom part, and folded inward by at least one left folding means; and a right side part connected to a right side of the bottom part, and folded inward by at least one right folding means, the left side part and the right side part each have a soft flexible side, so as to fold the bottom part inward when the left side part and the right side part are folded inward.

Abstract: A pyrene compound is provided. The pyrene compound is represented by Formula 1: wherein A1 and A2 are as defined in the specification. Further provided is an organic electroluminescent device using the pyrene compound. The organic electroluminescent device has high color purity of blue light and shows long life characteristics. Therefore, the organic electroluminescent device is suitable for use in displays and lighting systems.

Abstract: A pyrene compound is provided. The pyrene compound is represented by Formula 1: wherein A1 and A2 are as defined in the specification. Further provided is an organic electroluminescent device using the pyrene compound. The organic electroluminescent device has high color purity of blue light and shows long life characteristics. Therefore, the organic electroluminescent device is suitable for use in displays and lighting systems.