Abstract: A seat adjustment mechanism for a chair includes a first handle which controls the height of the seat above a surface supporting the chair. A second handle allows the user to selectively lock the seat at a user selected angle relative to the supporting surface. As the seat is tilted into a desired position, the seat adjustment mechanism provides limited horizontal and vertical movement of the seat to maintain the chair in an ergonomically correct position. The mechanism includes a housing or enclosure adapted for connection to a pedestal, and a seat bracket for mounting to the underside of the seat. An intermediate bracket is pivotably mounted to the lower enclosure. One end of the seat mounting bracket is pivotably connected to an end of the intermediate bracket, and the other end of the seat bracket is interconnected with the lower enclosure via a link arrangement.

Abstract: A mechanism for adjusting the height of a back relative to a seat in a seating assembly having a support member interconnecting the seat and the back. A recess is formed in an upright portion of the support member, and a toothed rack is secured within the recess. The upright portion of the support member is slidably engageable with a box-like unit secured to the back, and an engagement member is mounted to the box-like unit and disposed within the recess formed in the support member upright portion. The engagement member includes engagement structure selectively engageable with certain of the rack teeth to fix the position of the back relative to the support member. A biasing element urges the engagement member to an engagement position in which the engagement structure is engaged with certain of the one or more teeth.