the invention relates to a partition wall movable in an opening and consisting of double - walled panels coupled pivotally to each other at the standing edges , alternate panels being formed with a guide member attached fixedly to the panel and displaceable along a rail extending above the panels . an extension device in the form of a pin - like body which is slidable in an upper rail and which is continuously loaded by a force directed towards one of the standing hinged edges is provided . the partition wall is distinguished in that on the hinge edges two or more hinge assemblies are arranged , each provided with at least three parallel hinge pins and in each case with a pair of wings associated with each hinge portion . the partition wall further includes a panel wall whereby between the walls of each panel spacer elements are arranged .