Patent ID: 8176703

Claim:
In a shelter structure comprising: connecting joints, each having three arms orthogonal to each other, two of the arms being horizontal when a third is vertical, hollow horizontal bars having ends which fit over the horizontal arms of said joints, hollow vertical uprights having ends which fit over the vertical arms of said joints, and rectangular panels forming a floor, walls and a ceiling of said shelter structure, the improvement wherein: each of said arms has a rectangular cross-section, each of said horizontal bars has an open profile having an external vertical wall and an internal vertical wall, the external vertical wall being extended to form an external vertical shoulder ( 20 ) and a horizontal internal flange ( 22 ) extending from the vertical shoulder for engaging one of the horizontal arms ( 12 ) of the joints ( 11 ), the internal vertical wall terminating at a horizontal shelf ( 21 ) for supporting the panels forming the floor or the ceiling, and wherein each of the vertical uprights longitudinally has two vertical shoulders ( 23 ) extending therefrom which, when the upright is installed on the joint, are aligned with the vertical shoulders ( 20 ) of the horizontal bars ( 13 ) so as to define a rectangular support frame, and the panels ( 16 ) forming the walls of the structure rest against an inner surface of said external vertical shoulders of the horizontal bars and the vertical shoulders of the vertical bars.