Self-supporting structure

Claim 1

A SELF-SUPPORTING STRUCTURE OF THE CHARACTER DESCRIBED, COMPRISING IN COMBINATION A FIRST PAIR OF END FRAMES, A SECOND PAIR OF END FRAMES, EACH OF SAID END FRAMES OF SAID PAIRS OF END FRAMES INCLUDING A FRONT POST AND A REAR POST, THE RESPECTIVE END FRAMES OF SAID FIRST AND SECOND PAIRS OF END FRAMES BEING POSITIONED IN GENERAL LONGITUDINAL ALIGNMENT WITH THE REAR POSTS OF SAID FIRST PAIR OF SAID END FRAMES POSITIONED ADJACENT TO THE FRONT POSTS OF THE SECOND PAIR OF END FRAMES, AND MEANS CONNECTING THE FIRST-NAMED REAR POSTS WITH SAID SECOND-NAMED FRONT POSTS INCLUDING A TRANSVERSELY EXTENDING BEAM MEMBER HAVING HORIZONTALLY DISPOSED FLOOR SUPPORTING FLANGES EXTENDING LENGTHWISE THEREOF, SAID BEAM MEMBER BEING PROVIDED WITH MEANS FOR DETACHABLY CONNECTING THE SAME TO EACH OF THE END FRAMES OF SAID PAIRS OF END FRAMES, SAID CONNECTION MEANS INCLUDING A PAIR OF LONGITUDINALLY SPACED DOWNWARDLY OPENING VERTICAL SLOTS AT EACH END OF THE BEAM MEMBER, AND A TRANSVERSELY EXTENDING PIN PROVIDED ON EACH OF THE REAR POSTS OF SAID FIRST PAIR OF SPACED END FRAMES AND ON EACH OF THE FRONT POSTS OF SAID SECOND PAIR OF END FRAMES, SAID PINS ON THE ADJACENT FRONT AND REAR POSTS OF THE RESPECTIVE END FRAMES BEING ENGAGED WITHIN THE VERTICAL SLOTS OF THE BEAM MEMBER.