초록 ▼

A chair includes a base, a seat, a back and a linkage operably connecting the seat and the back to the base in a manner providing a synchrotilt movement of the back and the seat. The back is pivoted to the base at a first actual pivot for movement about a back tilt axis, and the seat is pivoted to t

A chair includes a base, a seat, a back and a linkage operably connecting the seat and the back to the base in a manner providing a synchrotilt movement of the back and the seat. The back is pivoted to the base at a first actual pivot for movement about a back tilt axis, and the seat is pivoted to the back at a second actual pivot for movement about a second axis that is generally aligned with the hip joints of a user. The seat is further movably and pivotally supported on the base.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A tilt back chair adapted for synchrotilt movement, comprising:a base;a control housing attached to said base, said housing having a front edge;a back support pivotally connected t

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] A tilt back chair adapted for synchrotilt movement, comprising:a base;a control housing attached to said base, said housing having a front edge;a back support pivotally connected to said control housing permitting rotation of said back support between upright and reclined positions;said back support having a back shell, a cushion, an upright, and lower stretcher portions fixedly attached to the lower ends of said upright, and said lower stretcher portions having forward ends connecting said back support to said control housing;springs mounted within said control housing in operative communication with said back support for biasing said back support including said back shell into a normally fully upright position;a seat supported on said base, said seat comprising a generally planar shell comprising a semi-rigid resiliently flexible sheet, and having top and bottom surfaces and forward and rearward portions;said forward portion of the seat being engaged with the said front edge of control housing;the rearward portion of said seat being supported upon and in sliding engagement with said lower stretcher portions such that recline of said back support causes at least a portion of said seat to flex, and simultaneously tilts the rear portion of said seat downwardly with said chair back when chair back is reclined from the fully upright position rearwardly;whereby, the angle by which said back support tilts with respect to a stationary point is greater than the angle by which said rearward portion of the seat tilts with respect to a stationary point, thereby achieving the synchrotilt movement.