Adjustable chair

1. A method of adjusting a chair relative to a work surface disposed a distance above a floor comprising:

placing a base of the chair on the floor a first distance away from an edge of the work surface;

rotating a seat of the chair relative to the base from a neutral position to a first angled position;

causing an individual to sit in the seat;

rotating the seat back to the neutral position from the first angled position;

moving the seat linearly forwardly relative to the base and toward the edge of the work surface; where the rotating of the seat relative to the base and the moving of the seat linearly relative to the base is accomplished without moving the base on the floor; and

preventing linear motion when the seat is moved to a desired location while still permitting rotational movement with a first locking mechanism comprising at least one lock teeth rail and at least one locking member; wherein the at least one lock teeth rail includes teeth that interlock with teeth on the at least one locking member; and wherein the at least one lock teeth rail is moved away from the at least one locking member to permit linear motion of the seat relative to the base.

2. The method according to claim 1 , further comprising:

locking the seat in the first angled position prior to causing the individual to sit in the seat.

3. The method according to claim 1 , further comprising:

preventing rotation of the seat prior to moving the seat linearly relative to the base with a second locking mechanism.

4. The method according to claim 1 , further comprising:

disengaging a first locking mechanism that restrains the seat against linear motion prior to moving the seat linearly.

5. A chair, comprising:

a seat;

a base adapted to rest on a surface;

an adjustment assembly operatively engaging the seat and the base;

wherein the adjustment assembly enables the seat separately to rotate relative to the base about a vertical axis and move linearly with respect to the base along an axis oriented at right angles to the vertical axis;

a first locking mechanism for selectively preventing linear motion of the seat relative to the base while permitting rotational motion of the seat relative to the base; wherein the first locking mechanism includes at least one lock teeth rail and at least one locking member; wherein the at least one lock teeth rail includes teeth that interlock with teeth on the at least one locking member; and wherein the at least one lock teeth rail is moved away from the at least one locking member to permit linear motion of the seat relative to the base;

a second locking mechanism with a pair of anti-rotate rails defining a gap therebetween and into which gap a portion of a stop provided on the adjustment assembly is received; and

wherein rotational motion and linear motion of the seat relative to the base is accomplished without moving the base relative to the surface.

6. A chair, comprising:

a seat;

a base adapted to rest on a surface;

an adjustment assembly operatively engaging the seat and the base; including a first mechanism operative to rotate the seat with respect to the base about the vertical axis; and a second mechanism operative to move the seat linearly with respect to the base along a horizontally-oriented axis;

wherein a portion of the first mechanism defines an aperture therein that is crescent-shaped aperture; and wherein the first mechanism further includes a stop that travels along the aperture during rotational motion; and

at least one detent extending into the crescent-shaped aperture and past which the stop travels during rotational motion; and wherein the at least one detent slows down the rotational motion;

wherein the adjustment assembly enables the seat separately to rotate relative to the base about a vertical axis and move linearly with respect to the base along an axis oriented at right angles to the vertical axis; and

wherein rotational motion and linear motion of the seat relative to the base is accomplished without moving the base relative to the surface.

7. The chair according to claim 6 , wherein each of the first mechanism and the second mechanism facilitates motion of the seat relative to the base from a reference position to one of a plurality of additional positions located remote from the reference position without moving the base relative to the surface.

8. The chair according to claim 6 , further comprising:

an actuator operatively engaged with the second mechanism, said actuator being movable between an actuated position where linear motion of the seat relative to the base is enabled, and a non-actuated position where linear motion of the seat relative to the base is prevented.

9. The chair of claim 6 , wherein the first mechanism includes a one or more transfer balls that move across a roller plate.

10. The chair of claim 6 , further comprising a first region adjacent the crescent-shaped aperture where the stop temporarily resists the rotational motion.

11. The chair of claim 10 , wherein the first region is a neutral position where at least one side of the seat is generally longitudinally aligned with at least one side of the base.

12. The chair of claim 11 , further comprising a second region adjacent the crescent-shaped aperture where the stop temporarily resists the rotational motion; and wherein the second region is located at an angle relative to the first region; and where the at least one side of the seat is oriented at the angle relative to the at least one side of the base.

13. The chair of claim 6 , wherein the at least one detent is operative to provide audible and tactile feedback to a user that the chair is prevented from moving freely.

14. The chair of claim 6 , further comprising a first locking mechanism for selectively preventing linear motion of the seat relative to the base while permitting rotational motion of the seat relative to the base.

15. The chair of claim 14 , further comprising a second locking mechanism for selectively preventing rotational motion of the seat relative to the base while permitting linear motion of the seat relative to the base.

16. The chair of claim 14 , wherein the first locking mechanism includes at least one lock teeth rail and at least one locking member; wherein the at least one lock teeth rail includes teeth that interlock with teeth on the at least one locking member; and wherein the at least one lock teeth rail is moved away from the at least one locking member to permit linear motion of the seat relative to the base.

17. The chair of claim 16 , wherein the second locking mechanism includes a pair of anti-rotate rails defining a gap therebetween and into which gap a portion of a stop provided on the adjustment assembly is received.