Patent ID: 7185910

Claim:
An adjustable chair comprising a support frame, an adjustable seat assembly secured to said support frame, an adjustable backrest assembly secured to a back support frame, said adjustable backrest assembly having displaceable back support elements, backrest adjustment means to adjustably secure said back support elements to a desired position to adjust the vertical length of said backrest, said backrest having a back cushion secured thereto, said back cushion being secured to a cushion extension and retraction mechanism to retract or extend a portion of said cushion in synchronism with said back support elements as said back support elements are displaced along said back support frame to retract or extend said backrest assembly lengthwise, said adjustable seat assembly having a pair of laterally displaceable seat panels each secured to a common laterally displacing mechanism operable to displace said panels to or away from one another in unison to provide equal lateral adjustment of said adjustable seat on opposed sides of a central plane aligned with said backrest, said adjustable seat assembly also having a displaceable front guide frame provided with a seat depth adjustable mechanism to extend and retract said front guide frame, and a seat cushion having opposed lateral sections extendable or retractable with the displacement of said seat panels and a frontal section extendable or retractable in unison with the displacement of said front guide frame.