Adjustable legs for desk and the like

A school desk having at least three legs adapted to be lengthened for raising the height of the desk, said legs having a rectangular cross-section and a perforation extending perpendicularly across the legs at a location adjacent the lower end thereof, a sleeve member having four lateral walls forming an internal cross-section substantially corresponding to the cross-section of the legs for allowing the sleeve members to fittingly slide over said legs, said lateral walls are provided with at least two longitudinal vertical ribs on the inner surface of each of said walls, said ribs having a thickness to fittingly contact said legs, said sleeve members being provided wiht a set of vertically spaced holes, in diametrically opposed walls, a screw and nut combination adapted to fittingly slide through said perforation and holes, for longitudinally locking said sleeves on said legs, said screws and nuts each having a head for applying pressure on said walls over said legs.