Abstract: An adjustable grommet for a chair including an oval shaped member having a top surface, a bottom surface and a contiguous curved side surface. The adjustable grommet is positioned between the chair seat and the chair legs. The adjustable grommet can flex and compress so that the chair seat is adjustable to the user's desired position.

Abstract: A chair back for a chair that includes a support frame portion having a defined shape and is adapted to attach to a chair base member. The chair back for a chair may also include a tensioning frame portion having a defined shape and a removable elastomeric support sleeve having an opening adapted to receive the defined shape of the support frame portion and the defined shape of the tensioning frame portion. The removable elastomeric support sleeve may be slid first over the support frame portion so as to conform the removable elastomeric support sleeve to the defined shape of the support frame portion. The removable elastomeric support sleeve may then be slid second over the tensioning frame portion thereby conforming the elastomeric support sleeve to the defined shape of the tensioning frame portion.

Abstract: An adjustable four plate assembly for a chair including a first plate having a top surface and a bottom surface, a second plate having a top surface and a bottom surface adapted to receive the top surface of the first plate so as to allow for the pivoting of said second plate from side to side. A third plate having a top surface and a bottom surface adapted to receive the top surface of the second plate so as to allow for the lateral sliding of the third plate from side to side. A fourth plate having a top surface and a bottom surface adapted to receive the top surface of the third plate so as to allow for the sliding of the fourth plate forwards and backwards. The adjustable four plate assembly allows for the second plate, the third plate and the fourth plate to move independently of one another and or in combination with one another.

Abstract: A vertically adjustable armrest assembly for a chair having a hydraulic actuator that allows the upper arm of the chair to be raised to a multiple of positions by engaging the hydraulic actuator with a lever located on the underside of the upper arm. The upper arm may also rotate about a horizontal axis allowing the user to orient the upper arm to the most comfortable position for keyboarding.