Patent ID: 8899868

Claim:
A miter coupling comprising: a square first tube, a longitudinal end of which defines a square first tube edge, wherein inner and outer edges are formed on opposing sides of the first tube edge; a square second tube, a longitudinal end of which defines a square second tube edge, wherein inner and outer edges are formed on opposing sides of the second tube edge; and a connector formed from a single sheet metal piece, the connector comprising: a substantially rectangular cross support forming a central portion of the connector, the cross support comprising opposing left and right edges along a first direction, and further comprising opposing first and second edges along a second direction, perpendicular to the first direction, respectively; and left and right elbow members extending from the left and right edges of the cross support, respectively, each elbow member comprising: a first section extending obliquely from the respective left or right edge of the cross support, towards the first tube, and terminating in a first outer edge; and a second section extending obliquely from the respective left or right edge of the cross support, towards the second tube, and terminating in a second outer edge; wherein a joint angle is defined by the angle between the first and second outer edges, and wherein the left and right elbow members are bent along the left and right edges of the cross support, respectively, so as to be parallel to and facing one another; whereby in an assembled state: the inner edges of the first and second tubes are seam-welded together; the outer edges of the first and second tubes substantially align with the first and second edges of the cross support, such that an interior of the tubes is not visible and the first and second tubes are separated by the joint angle; the first outer edges of left and right elbow members are each seam-welded to opposing sides of the first tube; and the second outer edges of the left and right elbow members are each seam-welded to opposing sides of the second tube.