#$%^&*AU2019205971A120200305.pdf#####ABSTRACT OF THE DISCLOSURE A hinge assembly is provided for pivotally connecting a first frame section and a second frame section. The hinge assembly includes at least one pivot plate pivotally connected to the first mounting structure of the first frame section with a first pin and pivotally connected to the first mounting structure of the second frame section with a second pin. The hinge assembly further includes a linkage bar with a first end pivotally connected to the second mounting structure of the first frame section with a third pin and a second end pivotally connected to the second mounting structure of the second frame section with a fourth pin. The pivot plate and the linkage rod are configured such that the second frame section pivots about the fourth pin during a working state and about the third pin during a transition between the working state and a folding state. 291/5 180 170 180 200 150 100 130 ,e-12 0 180 190 180 140 200 180 FIG. 1 16
