The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 1987
Filed:
Dec. 12, 1986
Ronald T Uecker, Slinger, WI (US);
Steven D Slicker, Mequon, WI (US);
MILSCO Manufacturing Company, Milwaukee, WI (US);
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.