Abstract: A device for lying or sitting on includes a frame and also a covering which is stretched over the frame and defines a surface for lying or sitting on of the device for lying or sitting on. A tensioning device is adapted to interact with the frame and/or the covering in order to vary the pre-tensioning force which acts upon the covering.

Abstract: A webbed frame includes a plurality of first and second straps mounted on a frame body to form a net. Each of the first and second straps has two opposite end sections trained on the frame body. A plurality of spaced apart retainers are fixed on the frame body. Each of several adjuster units includes a connector mounted slidably on a respective one of the retainers and connected to a respective one of the first and second straps. An adjusting bolt threadedly engages and extends through the connector, and has an abutting end that abuts against the frame body such that rotation of the adjusting bolt results in concurrent movement of the connector and the respective one of the first and second straps so as to adjust tension of the net on the frame body.