Telescopic support for seats, tables and the like

Claim 1

Telescopic support for members such as seats, tables and the like, of the type comprising a fixed outer tube, for attaching support legs, an inner tube sliding axially inside the outer tube attaching the member for which this support is intended, a rack integral with one of the tubes along one of its generatrices, a toothed wheel mounted to rotate freely on a shaft supported transversely by the other tube, in order to mesh with the aforesaid rack and a toothed shoe capable of engaging in the teeth of the aforesaid toothed wheel in order to prevent it from rotating and with which are associated operating means making it possible to disengage it from these teeth, characterised in that the rack is integral with the outer tube and the shaft of the toothed wheel is supported by a lower sliding extension of the inner tube, spring means normally keeping the inner tube and its extension in the extended position, whereas means for operating the toothed shoe are constituted by a rod to which the toothed shoe is attached at the lower end, which passes axially through the inner tube and its extension and whose upper end, provided with an enlarged head, is slidably connected by means of a stirrup member to a control lever pivoted at a pivot integral with the inner tube upward movement of the control lever causing the displacement in the same direction of the aforesaid rod, when the member supported by this support is not under load, but having no action on this rod when, owing to the loading of this member, the inner tube has slid downwards on its lower extension and on the rod.