Abstract: The seat plate of a chair control is pivotably mounted to the main frame so as to be tiltable forwardly and rearwardly. An arm extending from the seat plate has a slot which receives a pin of the main frame to limit forward and rearward tilting of the seat plate. The back bracket is configured such that either the forward or the rearward tilting of the seat plate is further limited by abutment with the back bracket, dependent upon the reclining position of the back bracket. However, the seat plate has a range of tilting motion irrespective of the tilt of the back bracket for the chair control.

Abstract: A chair adjustment mechanism is disclosed which allows a change of position in an unlocked state and maintains a position in a locked state. The mechanism, when used in conjunction with an adjustable chair part, may not be unlocked without a force being applied opposite to a force urging the part to a default position.

Abstract: A chair seat tilt mechanism includes a main frame for mounting to a spindle, a seat plate to which a chair seat may be mounted, a back bracket to which a chair back may be mounted, and first link arms. The first link arms are pivotally mounted at one end to the main frame by way of a main frame pivot and at another end to the rear of the seat plate by way of a rearward pivot. The back bracket is pivotally mounted near its front end to the main frame by way of a forward pivot and is further pivotally mounted to the seat plate at a medial pivot which is between the forward pivot and the rearward pivot. When assembled into a chair, if a chair occupant leans back against the chair back, the back bracket pivots about the forward pivot causing the medial pivot to move downwardly. This in turn causes the seat plate to pivot about the rearward pivot and results in a forward tilting of the chair seat.

Abstract: A chair seat tilt lock mechanism has a detent to latch an actuating lever in a locked and unlocked position. When the lever is moved to a locking position, a spring urges a moveable locking member toward a locking position, however, the moveable locking member only moves to its locking position when the chair is tilted to properly register the moveable locking member with a fixed locking member. When the lever is moved to an unlocking position, another spring urges the moveable locking member to an unlocking position. The moveable locking member may be a slider which slides under a fixed abutment to lock the chair from tilting. Alternatively, the moveable locking member may be a pivoting arm with a series of openings which may receive the forked end of a tongue in a locked position.

Abstract: A chair height control mechanism has a gas cylinder with a valve control finger extending from an upper end overlain by a tilting actuator. A resilient pad is adhered to the upper end of the gas cylinder surrounding the valve control finger and maintains a spacing between the valve control finger and actuator when the actuator is not in use to avoid rattle.

Abstract: An adjusting mechanism for adjusting the position of a first structural member relative to a second structural member. The mechanism is particularly well suited for use as a mechanism for adjusting the vertical or lateral position of a chair back or armrest relative to a chair seat and is adapted for one-handed adjustment. The adjustment mechanism has an arm mountable to a first structural member and slider securable to a second structural member that slidably engages the arm. A ratchet rack is on the arm and a pawl is supported by the slider, which is adapted to engage the ratchet rack, permitting only one direction movement of the slider along the arm. One of the pawl and slider has a cam guide, which has a portion substantially transverse to the ratchet rack and a portion extending from the substantially transverse portion in a direction substantially parallel to the rack. The other of the slider and the pawl has a cam follower extending therefrom. The cam follower, slidably engages the cam guide.