Patent ID: 7811023

Claim:
An assembly comprising: a load bearing structure having a first circular member rotatable about a first axis along a first horizontal axis, the first circular member having a first aperture; a suspended structure having a second circular member rotatable about a second axis along a second horizontal axis, the second circular member having a second aperture, the suspended structure including two plates parallel to each other and configured to receive the load bearing structure therebetween, wherein each of the two plates of the suspended structure cooperate with the load bearing structure through spherical surfaces together defining a ball joint connection therebetween; and a coupling member received in said first and second apertures to couple the suspended structure to the load bearing structure with the first axis adjacent to the second axis, the coupling member being oriented along a third axis parallel and adjacent to the first axis and the second axis, wherein the first and second circular members are unable to rotate with respect to one another about the third axis via a rotation prevention means and the second axis is offset vertically upwards from the first axis.