Adjustable office chair

Details Adjustable office chair Adjustable office chair

1986-12-12

1987-12-01

McCall, James T.

Chairs and seats

Movable bottom

Tiltable

297300, 297354, A47C 102

Patent

active

047099631

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

REFERENCES:
patent: 2784767 (1957-03-01), Soderberg
patent: 3622202 (1971-11-01), Brown
patent: 4509793 (1985-04-01), Wiesmann et al.
patent: 4652050 (1987-03-01), Stevens

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