Patent ID: 7784749

Claim:
A supporting framework, comprising: a roller having a radius, a top support surface, and an axis positioned generally horizontally when in a use position; a carrying frame carrying the roller; and a plurality of lateral guide elements coupled to the carrying frame, one of the lateral guide elements being positioned adjacent to one of the ends of the roller, another one of the lateral guide elements being positioned adjacent to another one of the ends of the roller, each one of the lateral guide elements having an extension portion with a length which is greater than the radius of the roller, each one of the extension portions being pivotal relative to the carrying frame between an active position and an inactive position, wherein the carrying frame has upwardly extending bearing limbs and further comprising a plurality of catches disposed on the bearing limbs and, with the lateral guide elements moved into the active position, project into slots in the lateral guide elements, the extension portions in the active position extending toward the top support surface of the roller, wherein the extension portions define a free space, the free space positioned between the extension portions in the active position and beyond the top support surface, the free space configured to provide access to the top support surface in the active position, and the extension portions in the inactive position located outside the free space.