Abstract: A jib crane supportable on a plurality of vertically spaced pairs of articulated joints disposed along first and second common axes laterally spaced apart and disposed parallel to each other to provide for horizontal swinging of the jib crane on both the first and second common axes, the upper of the pairs of joints being connected to the lower of the pairs of joints by a vertical post member to resist forces tending to displace or mis-align the joints from said common axes, respectively. The vertical post member preferably is equidistant of the said first and second common axes. The vertical distance between the upper and the lower joints is several times the distance between the said first and second common axes. This is an abstract only of the specific illustration of the invention given by way of example, and is not to be used in the interpretation of the claims nor as a limitation on the scope of the invention.