The invention relates to an active dynamic stool comprising the following: a seat part, a three-dimensional articulation system made up of at least three legs with foot parts at the lower end thereof, wherein the legs each have their upper end mounted on the seat part for movement on seat-part-mounted connecting articulations, such that the seat part can execute oscillating and circular movements in respect of its non-deflected rest position.

An office, work and leisure chair and retrofit kit for subliminal motions of the seated person. The chair has a cruciform base (1) with rollers (4), a pneumatic spring-action post (2) with an interface plate (5) for a seat panel (21) and seat pad (19), and a backrest (22). The seat panel is mounted with wobble capability on a pneumatic cushion, which has deformable air chambers (18, 35) connected by connecting hoses (27) and lies on an elastically deformable hollow body (14). The hollow body pumps the air chambers when a person sits down and stands up. A pump hose (12) with a one-way valve leads from the hollow body to compensate for leakage losses. Connecting hoses between the air chambers have valves (31; 75; 89) such that the wobbling distance of the seat panel and the damping of the wobbling motion is variable.

An office, work and leisure chair and retrofit kit for subliminal motions of the seated person. The chair has a cruciform base (1) with rollers (4), a pneumatic spring-action post (2) with an interface plate (5) for a seat panel (21) and seat pad (19), and a backrest (22). The seat panel is mounted with wobble capability on a pneumatic cushion, which has deformable air chambers (18, 35) connected by connecting hoses (27) and lies on an elastically deformable hollow body (14). The hollow body pumps the air chambers when a person sits down and stands up. A pump hose (12) with a one-way valve leads from the hollow body to compensate for leakage losses. Connecting hoses between the air chambers have valves (31; 75; 89) such that the wobbling distance of the seat panel and the damping of the wobbling motion is variable.

A seating device can include a height adjustment mechanism that permits a height of a seat to be adjusted. The height adjustment device can be configured so that a user may provide a force to provide upward height adjustment and may also provide a force to allowing for a controlled downward height adjustment of the seat. The height adjustment device can include an actuator that is connected to a rotatable member via linkages. An end of one of the linkages may engage the rotatable member to prevent rotation of the rotatable member, which can prevent height adjustment of the seat. Movement of the actuator may cause the linkages to move so that the rotatable member is free to rotate so that a user may provide a force on the seat to effect height adjustment of the seat and/or cause the seat to be lowered at a desired speed.

A seating device can include a height adjustment mechanism that permits a height of a seat to be adjusted. The height adjustment device can be configured so that a user may provide a force to provide upward height adjustment and may also provide a force to allowing for a controlled downward height adjustment of the seat. The height adjustment device can include an actuator that is connected to a rotatable member via linkages. An end of one of the linkages may engage the rotatable member to prevent rotation of the rotatable member, which can prevent height adjustment of the seat. Movement of the actuator may cause the linkages to move so that the rotatable member is free to rotate so that a user may provide a force on the seat to effect height adjustment of the seat and/or cause the seat to be lowered at a desired speed.

A seating arrangement includes a support shell including a seat portion and a chair back portion each configured to support a seated user, the chair seat portion having a front region and a rear region and the chair back portion having an upper region and a lower region, where the rear region of the seat portion is coupled to the lower region of the chair back portion, a control member including a substantially flexible front support and an attachment point, where the front support engages the support shell in the front region of the seat portion and the control member engages the back portion, and a substantially rigid second support attached to the control member at the attachment point, wherein the control member is an integral, one-piece component including multiple flex regions configured to allow the support shell to move between an upright and reclined position.

A seating arrangement includes a support shell including a seat portion and a chair back portion each configured to support a seated user, the chair seat portion having a front region and a rear region and the chair back portion having an upper region and a lower region, where the rear region of the seat portion is coupled to the lower region of the chair back portion, a control member including a substantially flexible front support and an attachment point, where the front support engages the support shell in the front region of the seat portion and the control member engages the back portion, and a substantially rigid second support attached to the control member at the attachment point, wherein the control member is an integral, one-piece component including multiple flex regions configured to allow the support shell to move between an upright and reclined position.