Corner cover mounting structure for heat-insulated housing for use in refrigerator

A heat-insulating housing comprising:

• a housing body having a plurality of side plates and an opening in one side of said housing body, the opening having four corners, each of said four corners being defined by two of said plurality of side plates, said two side plates being generally perpendicular to each other, and one of said two side plates having a hole with front and rear engaging open edges on opposite sides of the hole;
• a corner cover including two closing plates being disposed to be generally perpendicular to each other and forming a generally L-shaped section, said corner cover having two flanges protruding from opposite side edges of said two closing plates in a direction towards said two side plates, said two flanges being adapted to fit with said two side plates, wherein said two closing plates have backsides abutting against said two side plates of said housing body, respectively;
• an engagement protrusion including an insertion body protruding from said backside of one of said two closing plates abutted against said one of said two side plates having the hole and a flexible piece formed by folding a distal end of said insertion body such that said flexible piece spreads outwardly from a distal end of said engagement protrusion towards said one of said two closing plates, said engagement protrusion having a width that is slightly smaller than the front and rear engaging open edges of the hole, and said engagement protrusion being elastically deformable in a direction perpendicular to said two flanges and being formed on said backside of said one of said two closing plates abutting against said one of said two side plates having the hole, and said engagement protrusion being inserted into the hole;
• a plurality of engaging teeth formed on said flexible piece of said engagement protrusion such that said plurality of engaging teeth are aligned in a direction of insertion of said engagement protrusion, wherein one of said plurality of engaging teeth is engaged with at least one of the front and rear engaging open edges of the hole when said engagement protrusion is inserted into the hole;
• and
• a flexure limiting protrusion provided on said flexible piece so as to be operable to abut against said insertion body of said engagement protrusion to limit an amount of flexure developed in a direction in which said flexible piece approaches said insertion body of said engagement protrusion.