Packing case for substrates of flat display device

Abstract

An exemplary packing case ( 20 ) includes a main body ( 21 ) and a plurality of protrusions ( 213 ). The main body includes four side walls configured for receiving substrates. The protrusions are formed at inner sides of two opposite side walls of the main body, respectively. The protrusions are separately parallel to each other. Each of the protrusions has a wedge shape and is perpendicular to the two opposite side walls. Each two adjacent protrusions define a groove ( 215 ) therebetween. The groove includes a first portion and a second portion. The first portion is adjacent to the corresponding side wall. A width of the second portion increases along with increasing of a distance far away from the corresponding side wall.

1 . A packing case, comprising:
 a main body having four side walls; and   a plurality of protrusions formed at inner sides of two opposite of the side walls;   wherein at each of the opposite side walls, the protrusions are separate from each other and parallel to each other, each of the protrusions has a wedge shape and is perpendicular to the side walls, and each two adjacent protrusions define a groove therebetween; and   the groove comprises a first portion and a second portion, the first portion is adjacent to the side wall, and a width of the second portion increases with increasing distance away from the side wall.   
   
   
       2 . The packing case as claimed in  claim 1 , wherein the grooves at one of the two opposite side walls are symmetrical with respect to the grooves at the other of the two opposite side walls. 
   
   
       3 . The packing case as claimed in  claim 1 , wherein the main body further comprises a bottom, and the four side walls are perpendicular to the bottom. 
   
   
       4 . The packing case as claimed in  claim 3 , wherein the grooves are oriented perpendicular to the bottom of the main body. 
   
   
       5 . The packing case as claimed in  claim 3 , wherein the bottom comprises a plurality of protrusions that are separate from each other and parallel to each other, and each two adjacent protrusions at the bottom define a groove therebetween. 
   
   
       6 . The packing case as claimed in  claim 5 , wherein the grooves at the bottom are aligned one-to-one with the grooves at one of the two opposite side walls and aligned one-to-one with the grooves at the other of the two opposite side walls. 
   
   
       7 . The packing case as claimed in  claim 1 , wherein each of the protrusions comprises a first surface, a second surface parallel to the first surface, and a third surface, and the first and second surfaces are perpendicular to the corresponding side wall. 
   
   
       8 . The packing case as claimed in  claim 7 , wherein the second surface together with a corresponding portion of the first surface of an adjacent protrusion cooperatively define the first portion of the groove. 
   
   
       9 . The packing case as claimed in  claim 8 , wherein the third surface together with another corresponding portion of the first surface of the adjacent protrusion cooperatively define the second portion of the groove. 
   
   
       10 . The packing case as claimed in  claim 7 , wherein the third surface extends from an end of the second surface in a direction oblique to the corresponding side wall. 
   
   
       11 . The packing case as claimed in  claim 7 , wherein the third surface is a curved surface. 
   
   
       12 . The packing case as claimed in  claim 1 , wherein a top of the main body comprises a raised inner peripheral rim, and an outer peripheral ledge surrounding a bottom of the inner peripheral rim. 
   
   
       13 . The packing case as claimed in  claim 13 , further comprising a cover, wherein the cover is engaged with the main body by fittingly abutting the inner peripheral rim and the outer peripheral ledge of the main body, the cover and the main body thereby cooperatively defining a closed space. 
   
   
       14 . A packing case, comprising:
 a main body having four side walls; and   a plurality of protrusions formed at inner sides of two opposite of the side walls of the main body;   wherein at each of the opposite side walls, the protrusions are separate from each other and parallel to each other, each of the protrusions has a wedge shape and is perpendicular to the side wall, and each two adjacent protrusions define a groove therebetween; and   the groove comprises a first portion and a second portion, the first portion is adjacent to the side wall and has a uniform width, and the second portion flares from the first portion such that a width of the second portion adjacent to the first portion is the same as the width of the first portion and a width of the second portion farthest from the first portion is greater than the width of the first portion.   
   
   
       15 . The packing case as claimed in  claim 14 , wherein the grooves at one of the two opposite side walls are symmetrical with respect to the grooves at the other of the two opposite side walls. 
   
   
       16 . The packing case as claimed in  claim 14 , wherein each of the protrusions comprises a first surface, a second surface parallel to the first surface, and a third surface, and the first and second surfaces are perpendicular to the corresponding side wall. 
   
   
       17 . The packing case as claimed in  claim 16 , wherein the third surface extends from an end of the second surface in a direction oblique to the corresponding side wall. 
   
   
       18 . The packing case as claimed in  claim 18 , wherein the third surface is a curved surface. 
   
   
       19 . The packing case as claimed in  claim 14 , wherein the main body further comprises a bottom, and the four side walls are perpendicular to the bottom, the bottom comprises a plurality of protrusions that are separate from each other and parallel to each other, and each two adjacent protrusions at the bottom define a groove therebetween. 
   
   
       20 . The packing case as claimed in  claim 14 , wherein the grooves at the bottom are aligned one-to-one with the grooves at one of the two opposite side walls and aligned one-to-one with the grooves at the other of the two opposite side walls.