Rotary Fitting for a Corner Cupboard Comprising a Rotating Supporting Column

A rotary fitting for a corner cupboard comprises a lower and an upper mounting bracket; a supporting column having a main tube and being designed to be rotary mounted to the mounting brackets such that it rotates about its longitudinal axis; and at least two pie cut-shaped shelves to be supported by the supporting column fixed for rotation with the main tube. The supporting column includes a lower length adjusting assembly comprising a support element fixed in the main tube and comprising a recess; a screw element having a head fitting in the recess and a threaded shaft; a nut element arranged on the threaded shaft; and a lower end element fixed to the nut element and movable within the main tube; and an upper length adjusting assembly comprising a tube element partially arranged within the main tube; and a clamping element releasably clamping the tube element.