Adjustable chair

A chair for supporting the human body, and for adjusting to meet the unique ergonomic characteristics of individuals, said chair comprising:

• a base member having a front portion and a rear portion;
• a pair of spaced upwardly and rearwardly extending parallel back support members, each having first and second ends, with the first ends thereof attached to the front portion of said base member;
• a pair of spaced upwardly and forwardly extending parallel seat support members, each having first and second ends, with the first ends thereof attached to the rear portion of said base member;
• a seat having a front edge, a rear edge, first and second sides, and a seating surface therebetween upon which a user may sit, said seat adjustably mounted on said seat support members for movement toward and away from the second ends of said seat support members;
• a back having first and second sides and a substantially upright back support surface for supporting the back of the user, said back adjustably mounted at the first and second sides thereof on said back support members for movement toward and away from the second ends of said back support members and located in a generally vertically elevated position above said seat and
• said seat and said back independently adjustable between first positions wherein said seat and said back are positioned proximate a first lowest sealing height and a first lowest back height, respectively, thereby providing a first seating area defined as the area from said front edge of said seat to a first point where a projection of said back onto said seat intersects said seating surface, and second positions wherein said seat and said back are positioned proximate a second higher seating height and a second higher back height, respectively, thereby providing a second seating area defined as the area from said front edge of said seat to a second point where a projection of said back onto said seat intersects said seating surface, said second seating area being greater than said first seating area, since said seat moves forward relative to said base and said back moves rearward relative to said base as said seat and said back are moved from the first positions thereof to the second positions thereof.