Abstract: A guide device for the axial sliding of a first telescopic element, in particular connected to the seat-part of a seat, with respect to a second fixed element, in particular connected to the base of the seat, wherein the second fixed element comprises a first profile shaped so as to define internally—first vertical guide means, with which interposition means cooperate, interposed between the first telescopic element and the second fixed element, in order to promote the reciprocal axial sliding of the first telescopic element with respect to the second fixed element.

Abstract: A vertical springing device to allow the vertical springing and absorption of vibrations of a first telescopic element, in particular connected to the seat-part of a seat, with respect to a second fixed element, in particular connected to the base of the seat, comprises adjustment means of the elastic type, disposed inside the first telescopic element and able to adjust in height the level of the first telescopic element with respect to the second fixed element, and a springing mechanism, for the vertical springing of the first telescopic element with respect to the second fixed element.