Adirondack-style chair having improved comfort and support

Abstract

An Adirondack-style chair having a back with a curvate conformation providing enhanced comfort and support to a user, in relation to planar back structures traditionally used for such type chairs. The back can have a flattened S-shaped conformation, with an upper section having a curvature in a range of from 20-40 degrees and a lower section having a curvature in a range of from 40-60 degrees, as complementary angles to the angle that is included by the tangents to the ends of the curved sections.

1 . An Adirondack-style chair with a curved back wherein the curvature conforms substantially to the human back, providing enhanced support and comfort. 
     
     
         2 . The chair of  claim 1  with an outward curvature to the lower region of the back providing support to the lumbar region of the spine. 
     
     
         3 . The chair of  claim 1  wherein the back has an inward curvature to an upper back region. 
     
     
         4 . The chair of  claim 1  wherein the back has additional curvature along a side to side arc. 
     
     
         5 . The chair of  claim 1  wherein the back is adjustable forwardly and backwardly to change the angle of inclination with respect to a seat thereof. 
     
     
         6 . The chair of  claim 1  comprising a seat that is adjustable upwards and downwards at a front part thereof. 
     
     
         7 . The chair of  claim 1  wherein the back comprises slats that are vertically positioned with respect to the chair. 
     
     
         8 . The chair of  claim 1  wherein the back comprises slats that are horizontally positioned with respect to the chair. 
     
     
         9 . The chair of  claim 1  whose materials of construction comprise one or more materials selected from among wood, plastic, composite materials, and metal. 
     
     
         10 . The chair of  claim 1  whose materials of construction predominantly comprise wood. 
     
     
         11 . The chair of  claim 1  constructed and arranged for adjustment of height of the back and inclination of the back with respect to a seat portion thereof. 
     
     
         12 . An Adirondack-style chair, having a back that is shaped to resemble curvature of a human spine, with an upper section having a curvature in a range of from 20-40 degrees and a lower section having a curvature in a range of from 40-60 degrees, as complementary angles to the angle that is included by the tangents to the ends of the curved sections. 
     
     
         13 . An Adirondack-style chair, having a back with a flattened S-shape in side elevational profile. 
     
     
         14 . The chair of  claim 13  having a pre-shaped conformation of the back, at a lower range of normal back curvature, with a mechanical displacement assembly that translates the lumbar portion of the back and/or the thoracic portion of the back forwardly or rearwardly as desired, to change the degree of curvature at those sections of the chair back. 
     
     
         15 . The chair of  claim 13  whose materials of construction comprise one or more materials selected from among wood, plastic, composite materials, and metal. 
     
     
         16 . The chair of  claim 13  further comprising cam elements arranged for manual rotation to effect vertical adjustment of said back.