초록 ▼

An ergonomic chair having a shell that defines a seat and a back. The shell includes a lower back support that extends upwardly from the rear of its seat to about the middle of the back of the chair. An upper back support also extends upwardly from the rear of its seat. The upper and lower back supp

An ergonomic chair having a shell that defines a seat and a back. The shell includes a lower back support that extends upwardly from the rear of its seat to about the middle of the back of the chair. An upper back support also extends upwardly from the rear of its seat. The upper and lower back supports can be resiliently flexed independently of each other to respond to movement of the user's back against the back. The shell is mounted to a base which enables multiple identical chairs to be telescopically stacked in a space-saving configuration.

대표청구항 ▼

[ What is claimed is:] [18.] An ergonomic chair comprisinga frame formed from a plurality of interconnected members, said frame having a seat mount and legs extending downward from said seat mount and supporting said seat mount at a predetermined height;a shell secured to said frame, said shell form

[ What is claimed is:] [18.] An ergonomic chair comprisinga frame formed from a plurality of interconnected members, said frame having a seat mount and legs extending downward from said seat mount and supporting said seat mount at a predetermined height;a shell secured to said frame, said shell formed from an integral piece of resilient, polymeric material and molded to be substantially L-shaped, said shell comprising a seat and a back, said seat having a front, a rear, and side edges extending between said front and said rear, said rear having outer portions adjacent said side edges and a middle portion between said outer portions; a lower back support defined in said back, said lower back support having a base secured to said middle portion of said rear and having a surface extending, generally upwardly therefrom to terminate in an upwardly extending, first free end, said surface having a curved contour, said first free end resiliently flexing in relation to said base when weight or force from a user maybe applied to said lower back support;an upper back support defined in said back and including a pair of bands and a support section bridging said bands, said bands having fixed ends secured to said outer portions of said rear, said bands extending generally upwardly therefrom, said support section secured to said bands to define a second free end, said second free end resiliently flexing in relation to said outer portions when weight or force from a user maybe applied to said upper back support;said lower and upper back supports having corresponding lower and upper back support surfaces, said lower back support surface generally lying in a plane which is closer to said front of said chair than said upper back support surface when said chair is empty; wherein said upper and lower support surfaces flex independently of each other in response to weight and other forces exerted against said surfaces by said user's back resting thereon, said flexing of said support surfaces including rotation of said free ends in relation to said rear of said seat, whereby said seat, said upper back support, and said lower back support comprise three independent support zones;wherein said seat and said back define a seating surface against which said user is seated, and wherein said curved contour of said lower back support comprises a first portion that is convex in relation to said seating surface, said first portion located at said free end of said lower back support;wherein said curved contour comprises a second portion that is concave in relation to said seating surface, said second portion located between said first portion and said rear of said seat, said concave and said convex portions defining a serpentine shape sized generally to follow the corresponding S-shaped curve of said user's lower back; andwherein said shell has a variable thickness which is greater at said rear of said seat than at said free end of said lower back support.