Bracket support structure

Claim 1

A frame structure comprising at least two first frame members and two second frame members, each frame member being elongated and being rectangular in cross section, the two first frame members having opposite ends thereof attached to two second frame members with an end face of each of the first frame members abutting a side surface of one of the second frame members and an opposite end face of each of the first frame members abuttinG a side surface of the other of said second frame members, projections extending through the first frame member adjacent each end thereof, the projections projecting from opposite side faces of the first frame members, the first frame members attached to the second frame members by brackets, said brackets being U-shaped and having two legs interconnected by a flat bight section, the legs terminating in free ends, first openings through the legs adjacent the free ends, the openings having throat openings thereto from an edge of the legs, the throat openings being narrower than the maximum dimensions of the first openings in a line from the free ends to the bight and being positioned closer to the bight than portions of the first openings, a set screw through the bight, said brackets dimensioned to be received around the second members with the free ends projecting beyond the side face of the second members abutted by the ends of the first members remote from the bight by an amount sufficiently large so that the projections of the first member abutting the associated second member can be received in the throat openings by moving the bracket relative to the first member when the bracket is in position around the second member and the free end of the first member abuts the side face of the second member, the first openings dimensioned to loosely receive the projections, the maximum dimension of said brackets, from an inside face of the bight to the most remote wall of the first opening being greater than the dimension from the most remote surface of the projections of an abutting first member and the wall of the abutted second member opposite the surface of the bight when the first member abuts the second member whereby the bracket and an associated first member are movable along the second member after insertion of the projections into the first opening through the throat opening and fastenable at any position therealong by the set screw.