Packaging box

Abstract

A packaging box includes a bottom plate, two cover plates, two external plates, two internal plates, and four flaps. Each of the flaps has an engaging opening. When the packaging box is formed, the four flaps are respectively folded to closely contact the corresponding external plates, and the two internal plates are respectively folded to be inserted into the engaging openings of the two flaps on the corresponding sides, to save materials of the packaging box.

What is claimed is: 
     
         1 . A packaging box, comprising:
 a bottom plate;   two cover plates respectively connected to two opposite sides of the bottom plate along a first direction;   two external plates respectively connected to another two opposite sides of the bottom plate along a second direction, wherein the second direction is perpendicular to the first direction;   two internal plates respectively connected to outer sides of the corresponding external plates along the second direction, wherein sides of the two internal plates away from the corresponding external plates respectively have two flanges, and a length of the internal plate along the second direction is less than a length of the external plate along the second direction; and   four flaps, wherein two opposite sides of each cover plate that are distributed along the second direction are respectively connected to a flap, each of the flaps has an engaging opening, and when the two cover plates and the two external plates are respectively folded toward the bottom plate to form the packaging box, the four flaps are respectively folded to closely contact the corresponding external plates, and the two internal plates are respectively folded to be inserted into the engaging openings of the two flaps on the corresponding sides.   
     
     
         2 . The packaging box according to  claim 1 , wherein the two cover plates are respectively a front cover plate and a rear cover plate. 
     
     
         3 . The packaging box according to  claim 2 , further comprising a box cover portion and an inserting tongue portion, wherein the box cover portion is connected to the rear cover plate, and the inserting tongue portion is connected to the box cover portion. 
     
     
         4 . The packaging box according to  claim 1 , wherein each of the internal plates has an extending portion and an inserting portion, the extending portion is connected to the corresponding external plate, the inserting portion is connected to the extending portion, and the two flanges are provided on the inserting portion. 
     
     
         5 . The packaging box according to  claim 4 , wherein a width of the inserting portion along the first direction is less than a width of the external plate along the first direction. 
     
     
         6 . The packaging box according to  claim 4 , wherein a width of the inserting portion along the first direction is less than an engaging opening width formed by the engaging openings of the two flaps on the corresponding sides along the first direction. 
     
     
         7 . The packaging box according to  claim 6 , wherein the flanges are formed on two sides of the inserting portion and are fixed into the engaging openings of the two flaps on the corresponding sides, and a width of the flanges along the first direction is greater than the engaging opening width. 
     
     
         8 . The packaging box according to  claim 1 , wherein the two external plates respectively comprise a compensation portion connected to the corresponding internal plate.