Patent ID: 7140690

Claim:
An attachment system for assembling a frame comprising: a first frame member; a first set of mounting brackets coupled to the first frame member, the mounting brackets including a mounting flange and a tapered section, the tapered section having a raised portion and a mating surface, wherein the mating surfaces on the first set of mounting brackets taper outwardly from the first frame member from top to bottom; a second frame member; and a second set of mounting brackets coupled to the second frame member, the mounting brackets including a mounting flange and a tapered section, the tapered section having a raised portion and a mating surface, wherein the mating surfaces on the second set of mounting brackets taper outwardly from the second frame member from bottom to top; wherein the first and second sets of mounting brackets are positioned on their respective frame members so that the raised portions and the mating surfaces of the first set of mounting brackets is aligned with the raised portions and the mating surfaces of the second set of mounting brackets so that the brackets are slidably engagable to provide an interlocking fit, and wherein a portion of the mating surfaces of the first and second sets of mounting brackets contacts the respective first and second frame members.