Abstract: A support base for a tilting seat having a coupling body, a support body having a central portion, and a plurality of flexible components that are structurally separable and elastically yielding is provided. The flexible components are arranged between the coupling body and the central portion and meet in compression according to oscillations of a piston rod of the tilting seat.

Abstract: A chair assembly (1) of a chair or an armchair comprises a seat body (2), a backrest body (6), a locking and adjustment device (4), and a backrest support (10). The backrest support (10) is engaged with an articulated parallelogram that allows the position of the backrest body (6) to be changed while keeping it parallel to itself. The backrest support (10) further comprises spring return means.

Abstract: A mechanism for adjusting the seat of a chair as a result of changing the tilt of the backrest with respect to the seat is provided. The mechanism has a backrest frame and a base frame, as well as a covering element stably combined with the base frame and forming part of the seat. The backrest frame is rotatably constrained to the base frame around a respective rotation axis and tilting with respect to the seat between a position (P1) of minimum tilt and a position (P2) of maximum tilt. Advantageously, the covering element is partially elastically deformable, with the mechanism having deforming means operated by the backrest frame in order to reversibly deform, in the vertical direction, when the covering element as a function of the tilt angle with backrest frame has reached with respect to the position (P1) of minimum tilt.

Abstract: A device for adjusting the tilt of a chair backrest having a backrest frame rotatable with respect to the base frame of the chair is provided. The device includes elastic means for returning the backrest and/or countering the rotation thereof, in addition to means for controlling the preload of the elastic means. The means for controlling the preload include at least one first connecting rod and at least one first crank. The first connecting rod is hinged to the first crank and constrained to the elastic means so as to move the point of application of the returning and/or countering force with respect to the backrest. Adjusting means to adjust the position of the first crank determine at least two distinct stable positions of the first crank corresponding to two distinct positions of the mentioned point of application of the returning and/or countering force with respect to the base frame.

Abstract: Device for synchronizing the tilt of the back and the seat of a chair, of the type comprising a back frame, a seat frame and a support constrained to, or coincident with, the base of the chair, as well as at least one first crank hinged to the support and a front portion of the seat frame, and at least one second crank hinged to the support and a rear portion of the seat frame, so that the afore said at least one first and one second crank constitute a four-bar linkage with the seat frame. Advantageously, the device provides that the back frame is integral with the afore said at least one first crank.

Abstract: Device for synchronizing the tilt of a chair back and seat, of the type comprising a frame of the chair back (5), a frame of the seat (2) and a support (1) integral with the base of the chair, as well as at least one first crank (3), integral with the afore said frame of the chair back (5), and hinged (6, 7) at the rear to the frame of the seat (2) and to the support (1), and at least one second crank (4), hinged (8, 9) at the front to the frame of the seat (2) and to the support (1). The afore said first crank (3) and the second crank (4), with the frame of the seat (2), determine a articulated quadrilateral, wherein such a first crank (3) and such a second crank (4) lie substantially on skew lines.

Abstract: Device for synchronizing the tilt of the back and the seat of a chair, of the type comprising a back frame, a seat frame and a support constrained to, or coincident with, the base of the chair, as well as at least one first crank hinged to the support and a front portion of the seat frame, and at least one second crank hinged to the support and a rear portion of the seat frame, so that the afore said at least one first and one second crank constitute a four-bar linkage with the seat frame. Advantageously, the device provides that the back frame is integral with the afore said at least one first crank.

Abstract: Device for synchronizing the tilt of a chair back and seat, of the type comprising a frame of the chair back (5), a frame of the seat (2) and a support (1) integral with the base of the chair, as well as at least one first crank (3), integral with the afore said frame of the chair back (5), and hinged (6, 7) at the rear to the frame of the seat (2) and to the support (1), and at least one second crank (4), hinged (8, 9) at the front to the frame of the seat (2) and to the support (1). The afore said first crank (3) and the second crank (4), with the frame of the seat (2), determine a articulated quadrilateral, wherein such a first crank (3) and such a second crank (4) lie substantially on skew lines.

Abstract: The invention relates to a mechanism for an office chair or arm-chair, in which control means for the backrest inclination and spring means for biasing the backrest to the position of minimum inclination are provided, in which at least one stepped stop block can be moved in a controlled manner, a step of said block being suitable to interfere with a member connected to the backrest when the same is being inclined, in order to limit the stroke of said member between the position of minimum inclination of the backrest and a position of interference of the member connected to the backrest with a selected one of the block steps. The invention also relates to a method for transforming a locking mechanism to an end-of-stroke mechanism.

Abstract: Mechanism for regulating the preload of at least a stiffening spring (3) for a revolving element (2) with respect to at least a support frame (1) of a seating device, of the type comprising a mobile striker (7) for one end of said at least one spring (3), connected to said revolving element (2), and a regulating cursor (6, 10), onto which the other end of said at least one spring (3) rests, said regulating cursor (6, 10) being conceived to slide along a rod-shaped guide element (4), characterised in that said rod-shaped guide element (4) is connected, at one end thereof, in a sliding manner, to said mobile striker (7), and it is also integrally fixed to said support frame (1).

Abstract: Device (1) for adjusting the tilt of at least one movable component of a chair, of the type comprising at least one cam (16, 17), constrained in a rotation manner to a bracket (2), and at least one follower (15) constrained in a sliding manner on the profile (23) of said cam, the movable component being integral with the follower and the bracket being fixed with respect to the follower or vice versa. The device furthermore comprises means (13, 18) to constrain the follower to the bracket, the above-mentioned means (13, 18) and the above-mentioned cam (16, 17) being configured so that the constraint reaction of the follower on the cam is substantially always directed towards the centre of instantaneous rotation of the latter.

Abstract: A device for adjusting the elastic force exerted by a plurality of springs, wherein there are provided main springs and auxiliary springs connected to two mutually movable structures. There are provided means for operatively coupling or uncoupling the connection of the free end of one or more of the auxiliary springs with respect to at least one of the structures.