초록 ▼

A rectangular parallelepipedic case includes four or more walls formed by bending a single plate. To produce the case, a double plate is used. The double plate is formed from plastic by extrusion, and first and second plate elements confronted with each other. Partition portions interconnect the fir

A rectangular parallelepipedic case includes four or more walls formed by bending a single plate. To produce the case, a double plate is used. The double plate is formed from plastic by extrusion, and first and second plate elements confronted with each other. Partition portions interconnect the first and second plate elements, and extend in the direction of the extrusion, to define plural hollow chambers between the first and second plate elements. The double plate is bent along bend lines substantially at a right angle. At least one of the bend lines is at least partially curved.

대표청구항 ▼

[ What is claimed is:] [1.] A case producing method of producing a substantially rectangular parallelepipedic case, said case having plural walls formed by bending a single plate, said case producing method comprising the steps of:providing a double plate, said double plate being formed from plastic

[ What is claimed is:] [1.] A case producing method of producing a substantially rectangular parallelepipedic case, said case having plural walls formed by bending a single plate, said case producing method comprising the steps of:providing a double plate, said double plate being formed from plastic by extrusion, said double plate including first and second plate elements confronted with each other, and partition portions for interconnecting said first and second plate elements, said plural partition portions extending in an extruding direction, to define plural hollow chambers between said first and second plate elements; andbending said double plate along plural bend lines substantially at a right angle, at least one of said bend lines being at least partially curved,wherein said at least one curved bend line causes at least one of said walls to curve inward with respect to said case, andwherein said at least one curved bend line is located between two adjacent ones of said partition portions.