Patent ID: 8424913

Claim:
A chassis frame comprising: a right side rail running lengthwise of the frame, a left side rail running lengthwise of the frame, the right and left side rails being opposite each other and joined together by at least one crossmember, each side rail comprising a channel which has an interior bounded by a vertical wall and by horizontal top and bottom walls which extend from top and bottom of the vertical wall toward the top and bottom walls of the opposite side rail, a right rectangular tube, a left rectangular tube, each rectangular tube overlying, and having underlying support by, the top wall of the respective side rail, a right uniting member running lengthwise of the frame for uniting the right rectangular tube and the right side rail in assembly, and a left uniting member running lengthwise of the frame for uniting the left rectangular tube and the left side rail in assembly, each uniting member having a horizontal flange overlying and joined to the respective rectangular tube, and a vertical flange extending downward from the respective horizontal flange and joined to the respective side rail.