Chair having open shoulder backrest

A chair for a human user having scapulae and further having lumbar and thoracic spinal regions, said chair comprising:

• a seat platform;
• a back support frame having a proximal end and a distal end extending above the proximal end, the proximal end attached to the seat platform;
• a lumbar cushion having a lateral width and a front for engaging the lumbar region;
• a midrest attached to the back support frame between the lumbar cushion and the distal end for supporting the thoracic region, said midrest separate and spaced apart from the lumbar cushion, said midrest comprising a vertically oriented, substantially elongated thoracic cushion having a width and a generally vertical length and a front and an effective initial load deflection (ILD) firmness;
• one or more interstitial areas laterally proximate to the thoracic cushion;
• a chairback fabric attached to a fabric frame, the fabric frame configured to allow the fabric to hold an intended shape, the chairback fabric and fabric frame attached to the back support frame, the chairback fabric extending across at least one interstitial area wherein the chairback fabric covering the interstitial area that is laterally proximate to the thoracic cushion has an interstitial effective initial load deflection (ILD) firmness;
• wherein the thoracic cushion is less than five inches wide along at least two thirds of its length;
• and
• wherein the thoracic cushion effective initial load deflection (ILD) firmness is substantially higher than the interstitial effective initial load deflection (ILD) firmness such that the midrest primarily supports the seated user's thoracic spinal region and only minimally engages with the seated user's scapulae.

A chair for a human user having scapulae and a thoracic spinal region, said chair comprising:

• a seat platform;
• a back support frame having a proximal end and a distal end extending above the proximal end, the proximal end attached to the seat platform;
• a chairback attached to the back support frame between the proximal end and the distal end, said chairback comprising a cushion having at least two cushion regions, the regions comprising a vertically oriented thoracic cushion region centrally situated in the chairback, the thoracic cushion region having an elevation and a front;
• and a scapular cushion region laterally abutting and extending from both sides of the thoracic cushion region, the scapular cushion region also having an elevation;
• wherein the thoracic cushion region is less than five inches wide along at least two thirds of its length;
• and
• wherein the thoracic cushion region's elevation is substantially greater than the proximately adjacent scapular cushion region elevation thereby creating a ridge, such that the chairback primarily supports the seated user's thoracic spinal region and only minimally engages with the seated user's scapulae.

A chair for a human user having scapulae and a thoracic spinal region, said chair comprising:

• a seat platform;
• a back support frame having a proximal end and a distal end extending above the proximal end, the proximal end attached to the seat platform;
• a chairback attached to the back support frame between the proximal end and the distal end, said chairback comprising a cushion body having a vertically oriented thoracic cushion region laterally centered in the chairback, the thoracic cushion region having an effective initial load deflection (ILD) firmness;
• and a scapular cushion region laterally abutting and extending from both sides of the thoracic cushion region, the scapular cushion region generally normal to the seated user's scapulae, the scapular cushion region having an effective initial load deflection (ILD) firmness;
• wherein the thoracic cushion region is less than five inches wide along at least two thirds of its length;
• and
• wherein the thoracic cushion region's effective initial load deflection (ILD) firmness is substantially greater than the proximately adjacent scapular cushion region cushion effective initial load deflection (ILD) firmness, such that the chairback primarily supports the seated user's thoracic spinal region and only minimally engages with the seated user's scapulae.