Abstract: A chair includes a support spine. A seat assembly is coupled to the support spine, and the seat assembly includes a flexible frame being movable relative to the support spine. The flexible frame comprises a first frame element, a second frame element coupled to the first frame element at a first corner, and a third frame element coupled to the second frame element at a second corner. The first corner and the second corner are substantially independently movable relative to the support spine. A conformable panel is coupled to the flexible frame and configured to engage an occupant of the chair. A resistance assembly couples the support spine to the flexible frame. The resistance assembly bears against the flexible frame to facilitate substantially independent movement of the first corner and the second corner relative to the support spine.

Abstract: A chair includes a support spine. A seat assembly is coupled to the support spine, and the seat assembly includes a flexible frame being movable relative to the support spine. The flexible frame comprises a first frame element, a second frame element coupled to the first frame element at a first corner, and a third frame element coupled to the second frame element at a second corner. The first corner and the second corner are substantially independently movable relative to the support spine. A conformable panel is coupled to the flexible frame and configured to engage an occupant of the chair. A resistance assembly couples the support spine to the flexible frame. The resistance assembly bears against the flexible frame to facilitate substantially independent movement of the first corner and the second corner relative to the support spine.

Abstract: A chair system according to embodiments of the present invention includes a base comprising a seat for a user and one or more support legs, a back, and a flexible back support element rigidly coupled to the back and to the base, the flexible back support element comprising a flex zone, the flex zone comprising one or more notches, wherein the back is reclinable from an upright position to a reclined position, wherein the one or more notches are configured to narrow as the back reclines from the upright position to the reclined position, and wherein the one or more notches are open in the upright position and closed in the reclined position.

Abstract: A chair system according to embodiments of the present invention includes a base comprising a seat for a user and one or more support legs, a back, and a flexible back support element rigidly coupled to the back and to the base, the flexible back support element comprising a flex zone, the flex zone comprising one or more notches, wherein the back is reclinable from an upright position to a reclined position, wherein the one or more notches are configured to narrow as the back reclines from the upright position to the reclined position, and wherein the one or more notches are open in the upright position and closed in the reclined position.

Abstract: A chair system according to embodiments of the present invention includes a base comprising a seat for a user and one or more support legs, a back, and a flexible back support element rigidly coupled to the back and to the base, the flexible back support element comprising a flex zone, the flex zone comprising one or more notches, wherein the back is reclinable from an upright position to a reclined position, wherein the one or more notches are configured to narrow as the back reclines from the upright position to the reclined position, and wherein the one or more notches are open in the upright position and closed in the reclined position.

Abstract: A chair system according to embodiments of the present invention includes a base comprising a seat for a user and one or more support legs, a back, and a flexible back support element rigidly coupled to the back and to the base, the flexible back support element comprising a flex zone, the flex zone comprising one or more notches, wherein the back is reclinable from an upright position to a reclined position, wherein the one or more notches are configured to narrow as the back reclines from the upright position to the reclined position, and wherein the one or more notches are open in the upright position and closed in the reclined position.

Abstract: A “task” chair intended primarily for a person working at a computer terminal has a back provided with a pair of upright struts that incorporate respective parallelogram linkages operative to increase the curvature of the lumbar region of the seat back while at least substantially maintaining the contour of the upper region of the backrest when a person leans back in the chair.

Abstract: A “task” chair intended primarily for a person working at a computer terminal has a back provided with a pair of upright struts that incorporate respective parallelogram linkages operative to increase the curvature of the lumbar region of the seat back while at least substantially maintaining the contour of the upper region of the backrest when a person leans back in the chair.

Abstract: An adjustable work chair such as an office chair has a height-adjustable seat comprising a front seat part (2) and a rear seat part (3) connected by a hinge (4) that extends transversely of the seat. A first arm (15) is coupled between the front part of the seat and the head of a fixed part (13) of a seat lift (14), and a second arm (16) is coupled between an extendable piston of the lift (14) and the underside of the rear part (13) of the seat.

Abstract: The invention concerns an adjustable work chair such as an office chair having a height-adjustable seat comprising a front seat part (2) and a rear seat part (3) connected by a hinge (4) that extends transversely of the seat. A first arm (15) is coupled between the front part of the seat and the head of a fixed part (13) of a seat lift (14), and a second arm (16) is coupled between an extendable piston of the lift (14) and the underside of the rear part (13) of the seat.

Abstract: An anti-tipping chair base has a central support member with a generally upright axis, and a plurality of arms that extend generally radially outwardly from the axis and each of which is provided with a caster. An outer end portion of the arm has a shape that curves downwardly around the caster to an end edge outwardly of the caster. As seen in plan, the outer end portion of the arm has side edges that diverge in a direction towards the end edge and between which the end edge extends generally normal to the radial direction of the arm. The end portions of the arm comprise support elements that contact a surface on which the base is disposed in the event that the base tips in use.