A seating arrangement includes a back arrangement movable between upright and reclined positions, a linkage arrangement including a first link member comprising a portion of a seat arrangement, a second link member supported on a base, flexibly resilient front link members extending between forward portions of the first and second link members and being integral with the second link member, and a rigid rear link member extending between rearward portions of the first and second link members including a separate piece from the first or second link members, wherein the rearward portion of the first link member extends laterally in a first plane when the back arrangement is upright, and laterally in a second plane when the back arrangement is reclined, where the second plane is angled with respect to the first plane, and is positioned farther away from the base when the back arrangement is reclined than when upright.

A reconfigurable apparatus for sitting and having a seat mounted on a frame and movable under the weight of a sitting user. As an incident of the user sitting, resistance to movement of a back rest component is increased a predetermined amount based upon the user's weight. A manually operable subassembly allows the increased resistance to be changed from the predetermined amount with the user sitting on the seat.

An oscillation mechanism for a seat or a backrest of a chair or of an armchair is provided. The oscillation mechanism has a seat coupling, a backrest coupling, and a functional body made in a single piece of plastic material and consisting of a flexible unit portion, the functional body being elastically deformable by bending for the oscillation of the seat and of the backrest.

Disclosed herein is a chair that includes a backrest portion, a seat portion coupled with the backrest portion, a column portion coupled with the seat portion, a linkage coupled with the backrest portion, a leaf spring in direct contact with the linkage, an arc-shaped toothed structure fixed translationally relative to the column portion, and a different toothed structure in contact with the arc-shaped toothed structure. The chair is also configured such that when a weight is applied to the seat portion, a fulcrum point of the leaf spring moves as the different toothed structure moves along the arc-shaped toothed structure to thereby shorten a working length of the leaf spring and provide an increased resistance to tilting of the backrest portion relative to the column portion. A process for assembling the chair and a weight-based tilt-resistance assembly for use with the chair are also described herein.

A seating arrangement includes a base, a back arrangement and a seat arrangement each supported by the base, the back arrangement movable between an upright position and reclined position, the seat arrangement including a stop member, a shell supported on the base and forming at least a portion of the seat arrangement, the shell including a first portion and second portion movable relative to the first portion, the shell configured such that a downward force exerted on the first portion by a seated user forces the back arrangement from the reclined position toward the upright position, and a tilt limiter coupled to the base and configured to engage the stop member at both the upright position and the reclined position.

An adjustable chair has a seat and a splat. The seat has a lower base, an upper base, a tilt adjusting device, a lower rotating shaft, and an upper rotating shaft. The lower base has an assembling space. The upper base is movably deposited on the lower base. The tilt adjusting device is deposited in the assembling space. The lower rotating shaft is rotatably deposited in the lower base and connected to the tilt adjusting device. The upper rotating shaft is deposited in the upper base. The splat is tiltably connected to the seat and has a backrest unit and two connecting legs. The backrest unit is deposited at a rear side of the seat. The connecting legs are connected to the backrest unit, are connected to the lower rotating shaft, and are pivotally connected to the upper rotating shaft.

A piece of seating furniture includes a backrest and a seat. The seat is operatively connected to the backrest. The backrest and the seat, during a pivoting of the backrest, open one another at an opening angle. A backward-tilt stop is included for limiting relative movement of the seat and the backrest. The backward-tilt stop is situated in extension of a vertical support of a pedestal.

A reclining control system for a chair having a back and a seat including a rigid seat member having a bottom surface and a first rigid link having a first end and second end. The first end of the first rigid link may be adapted to engage the back and the second end of the first rigid link may be positioned proximally adjacent to the bottom surface of the rigid seat member. A rigid link may have a first end and a second end, where the first end of the rigid link may engage the bottom surface of the rigid seat member at an engagement point. The second end of rigid link may engage the second end of the first rigid link in an aft position. The reclining control system for a chair may further include a pivoting link having a first end and a second end. The first end of the pivoting link may engage the bottom surface of the rigid seat member at the engagement point and the second end of the pivoting link may engage the second end of the first rigid link in a fore position. The rigid link moves the rigid seat member from a non-reclining position in a downward and backward direction and the pivoting rigid link moves the back to a reclining position.

A body support assembly includes a seat assembly and backrest assembly supported by a tilt control assembly. Methods of using and assembling the body support assembly are provided.

A chair provided with a plate, to which a seat is freely articulated above, by way of at least one first linkage and a second pair of linkages in the rear and front regions, a backrest being articulated laterally and freely to said seat. The first end of a pair of cams is pivoted to the plate at the rear, and the second end is pivoted to the backrest.