A chair can include a chair back, or backrest, that is coupled to a base of a chair above a seat of the chair. A tilt mechanism can attach the backrest to the base. In some embodiments, the tilt mechanism can be configured so that the backrest rotates about multiple pivots as it reclines from an upright position to a reclined position to drive motion of the seat during recline of the backrest.

A workplace system comprises a work table, a height-adjustable work chair with a gas spring device, a plurality of sensors, an evaluation unit and a feedback device. At least one of the plurality of sensors is mounted on the worktable. At least one further of the plurality of sensors is mounted on or in the gas spring device and arranged to detect posture data of a user of the work chair. The evaluation unit is configured to receive the posture data and further measurement data from the plurality of sensors, to determine a well-being measure of the user on the basis of a joint evaluation of the received posture data and the measurement data, and to control the feedback device as a function of the well-being measure.

A workplace system comprises a work table, a height-adjustable work chair with a gas spring device, a plurality of sensors, an evaluation unit and a feedback device. At least one of the plurality of sensors is mounted on the worktable. At least one further of the plurality of sensors is mounted on or in the gas spring device and arranged to detect posture data of a user of the work chair. The evaluation unit is configured to receive the posture data and further measurement data from the plurality of sensors, to determine a well-being measure of the user on the basis of a joint evaluation of the received posture data and the measurement data, and to control the feedback device as a function of the well-being measure.

A seating furniture includes a seat with a seat surface, a pedestal and a tilt mechanism. The tilt mechanism is disposed between the pedestal and the seat and permits an inclination of the seat surface of the seat relative to the horizontal. In addition, the tilt mechanism has a lower bearing block mounted to the pedestal, and an upper bearing block fixedly connected to the seat. The lower bearing block has a convexly curved lower bearing surface on its upper side facing the upper bearing block, and the upper bearing block has a concavely curved upper bearing surface on its lower side facing the lower bearing block. The lower and upper bearing surfaces have substantially corresponding radii of curvature, so that the upper bearing block can be moved relative to the lower bearing block along the upper bearing surface. A tilt mechanism for seating furniture is also provided.

A seating furniture includes a seat with a seat surface, a pedestal and a tilt mechanism. The tilt mechanism is disposed between the pedestal and the seat and permits an inclination of the seat surface of the seat relative to the horizontal. In addition, the tilt mechanism has a lower bearing block mounted to the pedestal, and an upper bearing block fixedly connected to the seat. The lower bearing block has a convexly curved lower bearing surface on its upper side facing the upper bearing block, and the upper bearing block has a concavely curved upper bearing surface on its lower side facing the lower bearing block. The lower and upper bearing surfaces have substantially corresponding radii of curvature, so that the upper bearing block can be moved relative to the lower bearing block along the upper bearing surface. A tilt mechanism for seating furniture is also provided.

The invention relates generally to a system and methods for facilitating correcting and maintaining a good posture. More specifically, the invention is directed to a posture correcting chair including a seating component, a pump mechanism, and a frame assembly. The seating component may include an inflatable element and a base element. The inflatable element and the base element form a housing. The pump mechanism may include a pumpsuch as a mechanical or electrical pumpfor pumping a medium into or out from the housing such that an occupant of the seating component may maintain a good posture.

The invention relates generally to a system and methods for facilitating correcting and maintaining a good posture. More specifically, the invention is directed to a posture correcting chair including a seating component, a pump mechanism, and a frame assembly. The seating component may include an inflatable element and a base element. The inflatable element and the base element form a housing. The pump mechanism may include a pumpsuch as a mechanical or electrical pumpfor pumping a medium into or out from the housing such that an occupant of the seating component may maintain a good posture.

A height adjustment device used on furniture includes an inner tube having multiple clamp portions and multiple contact portions extending from the inner periphery thereof. Multiple grooves are defined in the outer periphery of the inner tube. A pneumatic tube is inserted into the inner tube and clamped by the contact portions. The inner tube is located in an outer tube that has a bottom cap and a top cap. Multiple ridges extend from the inner periphery of the outer tube. Each reduced opening accommodates the ridge corresponding thereto. The pneumatic tube has a piston rod and is connected to the bottom cap of the outer tube. The piston rod drives the inner tube to move relative to the outer tube. Multiple roller units are connected to ridges and roll the grooves of the inner tube to reduce friction between the inner tube and the outer tube.

A height adjustment device used on furniture includes an inner tube having multiple clamp portions and multiple contact portions extending from the inner periphery thereof. Multiple grooves are defined in the outer periphery of the inner tube. A pneumatic tube is inserted into the inner tube and clamped by the contact portions. The inner tube is located in an outer tube that has a bottom cap and a top cap. Multiple ridges extend from the inner periphery of the outer tube. Each reduced opening accommodates the ridge corresponding thereto. The pneumatic tube has a piston rod and is connected to the bottom cap of the outer tube. The piston rod drives the inner tube to move relative to the outer tube. Multiple roller units are connected to ridges and roll the grooves of the inner tube to reduce friction between the inner tube and the outer tube.

The invention relates to a piece of seating and supporting furniture with a seating and supporting body, comprising: a height-adjustable column; a seating and supporting body, which is mounted pivotably about at least one horizontal axis between a first end position and a second end position at a first end of the height-adjustable column; a stopping mechanism, which is situated at a second end of the height-adjustable column; and a locking mechanism for releasably locking the stopping mechanism. A seating and supporting piece of furniture which allows reliable and user-friendly operation is created according to the invention in that a transfer device is used to release the locking of the stopping mechanism by the locking mechanism via the pivoting of the seating and supporting body between the first end position and the second end position.