US Patent 7597413 Extension guide fitting for drawers

An extension guide fitting for drawers includes an extension rail at the drawer side, a carrier rail at the furniture body side, and a middle rail which runs between the extension and carrier rails at both sides of the drawer. The load between the rails is transmitted by running rollers which are mounted in separate carriages. Mounted in the front region of the carrier rail are at least two stationary support rollers on which the extension rail runs via a running limb so as to support the extended rail at least in the closed condition of the drawer.