Patent ID: 8851571

Claim:
A movement device for an element of furniture, usable to allow angular movement of a revolving seat of said element of furniture with respect to a fixed portion, said device comprising: a rotating shaft, integral with said revolving seat; a hollow hub, integral with said fixed portion, wherein said rotating shaft is coupled in a rotatable and axially sliding manner to said hollow hub to define at least a first, lifted, position of rest, in which a positioning of said seat takes place in a free, or predefined, determined position with respect to said fixed portion; a biasing element, coupled both to said hollow hub and to said rotating shaft, to exert an axial elastic action of contrast on said rotating shaft and to maintain said rotating shaft normally in said first position of rest; a friction element, constrained to said rotating shaft and disposed within said hollow hub; a stop element, integral with said hollow hub and configured to selectively contact said friction element to define a second position of use of said rotating shaft, lowered with respect to said first position of rest, in which rotation of said rotating shaft is angularly countered by said friction element; and a rolling element, arranged coaxially to the rotating shaft and interposed between the biasing element and the hollow hub to release torsional stresses of the biasing element.