Patent 10389092 was granted and assigned to Mitsubishi Electric Corporation on August, 2019 by the United States Patent and Trademark Office.
A frame assembly body includes a connected section in which one ends of first and second frame materials, each of which has plural bent sections and plural surfaces, are joined perpendicularly. The connected section has: a projected piece locking section in which a slit-shaped fitting hole, a notch, or a recessed section formed in the second frame material is fitted to a projected piece provided in the first frame material; and a slit fitted section in which a slit-shaped notch formed in the second frame material is fitted to a fitting slit formed in a manner to notch the first frame material.