KareChare

Abstract

An ergonomic chair including a seat support structure with a seat and seatback supported by the seat support structure. The seat of the chair is shortened to accommodate the buttocks and ischia, with no weight-bearing on the thighs. The seat back is characterized by an upper portion which protrudes forward greater than the lower portion with a sudden transition to provide an innate lumbar support. Arm rests, if present, do not protrude forward of the seat. A standard seat will have a seat of 12 inches, seat back transition 1.5 inches in depth and 4 inches in height. The chair may be constructed with different measures -and ratios to accommodate differences in size and shape of potential users.

1 . A chair comprised of a seat support structure, a seat, a seat back, and optional arm rests. The chair is characterized by: 
 a) The seat is of a length to support the ischia and buttocks with no weightbearing through the thighs.    b) A seatback with the superior portion protruding forward greater than the inferior portion. The transition from the superior to inferior portion is sudden.    c) Arm rests, if present, do not protrude forward of the seat.    The chair of claim one is built without modification to current chair making technology or materials beyond those modifications described in the claim.    A standard size chair of claim one has a seat of 12 inches. The seat back height is variable with the transition occurring at 4 inches above the seat, and with an anterior-posterior depth of 1.5 inches at the transition.