Patent ID: 7188908

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 with a stop and an end portion, the mating surface having a top and a bottom, the stop being located at a position intermediate the top and the 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 with a stop and an end portion, the mating surface having a top and a bottom, the stop being located at a position intermediate the top and the bottom; 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 mating surfaces of first and second sets of mounting brackets may only engage until each end portion contacts stops.