A tilting mechanism (1) for chairs includes a support frame (2), a structure (4) rotationally coupled to the support frame. An elastic system (80) is interposed between the support frame and the structure to counteract a reaction to the tilting of the structure from an at-rest position to a tilted position. An adjustment system (20) is capable of varying the reaction to the tilting. The elastic system (80) includes at least one elastic element (12) and a first and a second stop element (81, 82) fastened at respective longitudinal end portions of the elastic element, respectively. In the at-rest position, the first and second stop elements are in contact with each other, and the elastic element (12) is in a deformed configuration and generates a residual elastic force that is at least partially released on the first and second stop elements.

The invention relates to a chair (1) which comprises a support (6), a seat element (5), a back element (4), a leg element (3), a spring mechanism and a weight-controlled working adjusting element for the spring mechanism.

A chair includes a back member and arm brackets. The back member is tapered toward an end that is adjacent to a seat. The arm brackets are attached under a bottom portion of the seat. Each arm bracket is adjustable to provide a seat clearance area for the seat when one or more of the arm brackets are adjusted up to approximately 90 degrees from an original upright position.

A synchronous chair mechanism (10) for simultaneously changing a seat and a backrest of a chair from a zero position in which the backrest is tilted to a minimum extent relative to the seat, into an end position in which the backrest is tilted to a maximum extent relative to the seat, includes a base (20) that is connectable to a substructure provided for setting up the chair. The synchronous chair mechanism also includes a backrest carrier (30) on which the backrest is mountable, a seat support (40) that is designed for holding a seat, and a spring element (8) having a front end and a rear end. The backrest carrier (30) is mounted on the base (20) so as to be pivotable about a first rotational axis (710). The seat support (40) is connected to the backrest carrier (30) so as to articulate about a second rotational axis (720), and is connected to the front end of the spring element (80) so as to articulate about a third rotational axis (730). The rear end of the spring element (80) is hinged to the backrest carrier (30) via a fourth rotational axis (740). A latching structure (310) is formed on the backrest carrier (30). The synchronous chair mechanism (10) includes a slide coupling piece (60) that is mounted on the rear end of the spring element (80) so as to be pivotable about the fourth rotational axis (740). Outside the zero position of the synchronous chair mechanism (10), the slide coupling piece (60) engages with the latching structure (310) of the backrest carrier (3; 30) so that the slide coupling piece (60) and the backrest carrier (30) are fixedly connected to one another. In the zero position of the synchronous chair mechanism (10), the slide coupling piece (60) is decoupled from the latching structure (310) of the backrest carrier (30) so that the slide coupling piece (60) is movable relative to the latching structure (310), as the result of which a distance between the fourth rotational axis (740) and the first rotational axis (710) is changeable.

A seating arrangement includes a seat assembly, a control assembly, a back assembly, and a quick-connection arrangement to connect the back assembly to the control assembly, where the back assembly includes first and second reliefs and the control assembly includes first and second shafts received within the first and second reliefs respectively, and a locking arrangement that includes a primary locking member pivotable between a locked position, where the primary locking member abuts the second shaft arrangement, thereby preventing the second shaft arrangement from being removed from within the second relief, and an unlocked position, where the second shaft arrangement may be removed from within the second relief, thereby allowing the back assembly to be uncoupled from the control assembly.

A chair, comprising, a backrest, a seat coupled with the backrest, a column coupled with the seat, a linkage statically attached to the backrest and rotatably attached below the seat, a leaf spring statically attached at one end and in direct contact with the linkage to provide a resistance to tilting of the backrest relative to the column. A first structure fixed to the column, where a portion of the first structure has an arc shape that includes one or more teeth, and a second structure in contact with the first structure, wherein a portion of the second structure includes one or more teeth. The chair is configured such that, when a weight is applied to the seat, the one or more teeth of the second structure, a pivot point at which the backrest is configured to tilt relative to the column, and the linkage are configured to move together.

A chair, comprising, a backrest, a seat coupled with the backrest, a column coupled with the seat, a linkage statically attached to the backrest and rotatably attached below the seat, a leaf spring statically attached at one end and in direct contact with the linkage to provide a resistance to tilting of the backrest relative to the column, a first structure fixed to the column. A portion of the first structure has an arc shape that includes one or more teeth, and a second structure in contact with the first structure. The chair is configured such that, when a weight is applied to the seat, one or more teeth of the second structure move along the one or more teeth of the first structure to shorten a working length of the leaf spring and provide an increased resistance to tilting of the backrest relative to the column.

A seating arrangement includes a back frame that includes a top portion, a bottom portion, and a pair of side portions that cooperate to define an opening, wherein at least one of the top portion, the bottom portion and the side portions include a longitudinally extending channel, a back shell having a forwardly facing support surface located within the opening and configured to support a seated user, and an attachment portion that extends about at least a portion of a periphery the support surface, and a cover member extending over the support surface, wherein the cover member is directly attached to the attachment portion of the back shell at an attachment location, and wherein the attachment location and the attachment portion of the back shell are located within the channel and concealed from view.

A chair includes a back member and arm brackets. The back member is tapered toward an end that is adjacent to a seat. The arm brackets are attached under a bottom portion of the seat. Each arm bracket is adjustable to provide a seat clearance area for the seat when one or more of the arm brackets are adjusted up to approximately 90 degrees from an original upright position.

A reconfigurable apparatus for seating a user and having: a frame; a seat movable relative to the frame between: a) a first position in which the seat resides with no user sitting on the seat; and b) a loaded position; a back rest with a changeable angular orientation relative to the frame; and an adjusting assembly having a plurality of gears that move relative to each other as an incident of the seat moving from the first position into the loaded position to thereby cause an increase in resistance to changing of the angular orientation of the back rest.