Joining structure of packaging container

Abstract

A joining structure of a packaging container is divided into at least two packaging members, and the joining structure includes: first slits formed in a dividing direction and located on both side of at least one corner of a joining-side end of a first packaging member, the first packaging member and a second packaging member being joined to each other; an engaging corner formed at a joining-side end of the second packaging member, the engaging corner being engaged with each of the first slits and being located on an inner side of a corner of the first packaging member, the engaging corner being formed at a corner corresponding to the corner of the first packaging member; and a cover that continues to the engaging corner and is located to cover an outer side of a joining end of the first packaging member on an outer side of the first slits.

What is claimed is: 
     
         1 . A joining structure of a packaging container that is divided into at least two packaging members, the packaging members being joined to each other to form the packaging container,
 the joining structure comprising:   first slits that are formed in a dividing direction and are located on both side of at least one corner of a joining-side end of a first packaging member, the first packaging member and a second packaging member of the at least two packaging members being joined to each other, an engaging corner formed at a joining-side end of the second packaging member, the engaging corner being engaged with each of the first slits and being located on an inner side of a corner of the first packaging member, the engaging corner being formed at a corner corresponding to the corner of the first packaging mender; and a cover that continues to the engaging corner and is located to cover an outer side of a joining end of the first packaging member on an outer side of the first slits,   wherein the engaging corner has a shape to be located to face an inner surface of the corner of the first packaging member via a space.   
     
     
         2 . The joining structure of the packaging container according to  claim 1 , wherein
 the second packaging member has second slits in a direction orthogonal to the dividing direction, the second slits being located at a corner of a joining-side end, and   the corner located on a tip side of the second slits is bent inward, to form the engaging corner.   
     
     
         3 . The joining structure of the packaging container according to  claim 2 , wherein a length of the first slits of the first packaging member is greater than a length from a position of the second slits of the second packaging member to the joining-side end. 
     
     
         4 . The joining structure of the packaging container according to  claim 2 , wherein the engaging corner of the second packaging member has third slits formed in the dividing direction, the third slits being inserted into the first slits. 
     
     
         5 . The joining structure of the packaging container according to  claim 4 , wherein a length of the third slits is smaller than a length of the first slit. 
     
     
         6 . The joining structure of the packaging container according to  claim 1 , wherein the engaging corner is former with a sloping surface that is the cover bending inward at both side of the corner of the second packaging member. 
     
     
         7 . The joining structure of the packaging container according to  claim 1 , wherein at least one of the corners of the first packaging member and the second packaging member has an angled portion. 
     
     
         8 . The joining structure of the packaging container according to  claim 1 , wherein, when the number of packaging members to be joined is an odd number not smaller than three, the number of the second packaging members is larger than the number of the first packaging members. 
     
     
         9 . The joining structure of packaging containers according to  claim 1 , wherein at least one of the dividing directions is a height direction. 
     
     
         10 . The joining structure of the packaging container according to  claim 1 , wherein an outer size of the second packaging member is larger than an outer size of the first packaging member, each outer size being in a direction orthogonal to the dividing direction. 
     
     
         11 . The joining structure of a packaging container according to  claim 1 , wherein slits corresponding to sizes of packaging boxes are formed in the same packaging member, to allow the packaging member to be used for packages of different sizes.