One-piece sheet-metal structure formed with clench locked corners

A stamping method for forming a one-piece oven door frame comprising, in combination, the steps of:

• providing sheet metal to form a first wall of the one-piece oven door frame;
• bending a second wall perpendicularly extending from the first wall at a second wall bend;
• bending a third wall perpendicularly extending from the first wall at a third wall bend;
• wherein the second wall is perpendicular to the third wall;
• wherein a first end edge of the second wall is adjacent to a first end edge of the third wall to form a first corner;
• wherein the rectangular-shaped first top tab is located at the first end edge of the third wall;
• bending a rectangular-shaped first bottom tab perpendicularly extending from the first end edge of the second wall at a first bottom tab bend with a free end of the rectangular-shaped first bottom tab opposite the first bottom tab bend to engage an inner side of the third wall;
• and
• bending a rectangular-shaped first top tab perpendicularly extending from an outer edge of the third wall at a first top tab bend with a free end of the rectangular-shaped first top tab opposite the first top tab bend and around the rectangular-shaped first bottom tab to engage an inner side of the rectangular-shaped first bottom tab to clench the rectangular-shaped first bottom tab against the inner side of the third wall at the first corner.

A one-piece oven door frame formed by a stamping method comprising, in combination, the steps of:

• providing a sheet of stainless steel to form a first wall of the one-piece oven door frame;
• bending a second wall perpendicularly extending from the first wall at a second wall bend;
• bending a third wall perpendicularly extending from the first wall at a third wall bend;
• wherein the second wall is perpendicular to the third wall;
• wherein a first end edge of the second wall is adjacent to a first end edge of the third wall to form a first corner;
• wherein the rectangular-shaped first top tab is located at the first end edge of the third wall;
• bending a rectangular-shaped first bottom tab perpendicularly extending from the first end edge of the second wall at a first bottom tab bend with a free end of the rectangular-shaped first bottom tab opposite the first bottom tab bend to engage an inner side of the third wall;
• and
• bending a rectangular-shaped first top tab perpendicularly extending from an outer edge of the third wall at a first top tab bend with a free end of the rectangular-shaped first top tab opposite the first top tab bend and around the rectangular-shaped first bottom tab to engage an inner side of the rectangular-shaped first bottom tab to clench the rectangular-shaped first bottom tab against the inner side of the third wall at the first corner.