Adjustable office chair

摘要: An adjustable office chair (10) comprises a base assembly (12), seat (14) and backrest (16). The is horizontally rotatable on the (12) raised lowered thereon by manually controlled pneumatic actuator (24) connected between assemblies (12, 14). lower frame (50) which mounted piston rod (28) of for horizontal rotation an upper (52) vertical pivotal movement (50). A pan (54) movably movable to selected attitudes wherein it automatically releasably latched mechanism (56). (16) (120) (122) can be adjustably tilted relative locked in tilt position operable lock forced reclining against spring bias biasing springs (76) as occupant leans backward such motion accompanied proportional rearward downward sloping (14). linkage (94, 95, 100) adjusts amount force acting during motion. lockout (171, 172) selectively prevents or permits