A portable lumbar support and ergonomic chair having a lumbar support. The lumbar support has a seat hingedly coupled to a seat back having a teardrop-shaped lumbar support seat back cushion. A rigid back support portion may be rotated forward about hinges to collapse substantially parallel to the seat frame and backward to open to a variety of angles with respect to the seat frame. The seat back freely pivots around an upper lateral axis, and the rigid back support portion is linearly adjustable to space the seat back toward and away from the hinges to enable raising or lowering the upper lateral axis and thus the seat back with respect to the lower lateral axis. This provides multiple ways of changing which part of the teardrop-shaped lumbar support curve hits your lumbar curve for proper support. Variable lumbar lordotic support is thus provided.

An adjustable seat assembly may have a seat back that is configurable in a fore position or a stern-facing seat, an aft position for a bow-facing seat, and a pillow position which facilitates a user laying down across the stern-facing seat. In addition, the seat back may be placed in a stowed position in which the seat back is absent from both the bow-facing and stern-facing seats, such that the seats cooperate to provide a planar support surface along an aft-to-fore extent of the seat assembly. The seat back may be adjustable by hand without tools, such that a user may easily reconfigure the seat assembly to sit facing the bow, to sit facing the stern, or to lie down.

An adjustable seat assembly may have a seat back that is configurable in a fore position or a stern-facing seat, an aft position for a bow-facing seat, and a pillow position which facilitates a user laying down across the stern-facing seat. In addition, the seat back may be placed in a stowed position in which the seat back is absent from both the bow-facing and stern-facing seats, such that the seats cooperate to provide a planar support surface along an aft-to-fore extent of the seat assembly. The seat back may be adjustable by hand without tools, such that a user may easily reconfigure the seat assembly to sit facing the bow, to sit facing the stern, or to lie down.

An ergonomic chair, includes: a support structure, a seat assembly, and a backrest. The seat assembly includes a seat and a seat mount arranged on the support structure. The backrest is rotatably connected to the support structure through a backrest support, and the backrest is configured to be rotatable and fixed relative to the seat assembly.

An ergonomic chair, includes: a support structure, a seat assembly, and a backrest. The seat assembly includes a seat and a seat mount arranged on the support structure. The backrest is rotatably connected to the support structure through a backrest support, and the backrest is configured to be rotatable and fixed relative to the seat assembly.

A chair includes a seat surface and a laterally pivotable backrest. The backrest is secured to two joints, which have mutually parallel axes of rotation.

A backrest portion supported, such as to be pivotable around an axis extending along its width direction center line, by a base, a left arm holding portion projecting forward from a left side portion of the backrest portion and supported, such as to be pivotable up and down around its base end portion, by the backrest portion, a right arm holding portion projecting forward from a right side portion of the backrest portion and supported, such as to be pivotable up and down around its base end portion, by the backrest portion, a left leg holding portion extending downward from a vicinity of a left side portion of a front edge of a seat portion at a front side of the base and supported, such as to be pivotable up and down around its upper end portion, by the base, and a right leg holding portion extending downward from a vicinity of a right side portion of the front edge of the seat portion at the front side of the base and supported, such as to be pivotable up and down around its upper end portion, by the base are included.

A portable lumbar support and ergonomic chair having a lumbar support. The lumbar support has a seat hingedly coupled to a seat back having a teardrop-shaped lumbar support seat back cushion. A rigid back support portion may be rotated forward about hinges to collapse substantially parallel to the seat frame and backward to open to a variety of angles with respect to the seat frame. The seat back freely pivots around an upper lateral axis, and the rigid back support portion is linearly adjustable to space the seat back toward and away from the hinges to enable raising or lowering the upper lateral axis and thus the seat back with respect to the lower lateral axis. This provides multiple ways of changing which part of the teardrop-shaped lumbar support curve hits your lumbar curve for proper support. Variable lumbar lordotic support is thus provided.

A portable lumbar support and ergonomic chair having a lumbar support. The lumbar support has a seat hingedly coupled to a seat back having a teardrop-shaped lumbar support seat back cushion. A rigid back support portion may be rotated forward about hinges to collapse substantially parallel to the seat frame and backward to open to a variety of angles with respect to the seat frame. The seat back freely pivots around an upper lateral axis, and the rigid back support portion is linearly adjustable to space the seat back toward and away from the hinges to enable raising or lowering the upper lateral axis and thus the seat back with respect to the lower lateral axis. This provides multiple ways of changing which part of the teardrop-shaped lumbar support curve hits your lumbar curve for proper support. Variable lumbar lordotic support is thus provided.

A chair includes a seat, a backrest and a frame to support the seat and backrest. The frame includes first and second supports disposed at first and second sides of the chair, respectively. The chair also includes a first engaging mechanism pivotally coupling the backrest with the first support, and a second engaging mechanism pivotally coupling the backrest with the second support. The first or second engaging mechanism includes first, second and third members. The first member fixedly is coupled with the backrest. The second member pivotally connects the first member of the respective engaging mechanism with the first or second support, thereby allowing the backrest to rotate along a first axis in the width direction of the chair. The third member is fixedly coupled with the first or second support and configured to limit the rotation of the backrest.