METHOD OF PROVIDING A SEAT BACK INVOLVING THE USE OF A DESIGN MANIKIN

摘要

A method of providing a seat back ( 17 ) of a seat assembly including shape defining steps that involve the use of a design manikin ( 14 ). A contour of the centerline ( 15 ) for the seat back is determined according to a hip point ( 10 ), or 'h-point,'and a torso line ( 12 ) of the manikin. The determination includes definition of a lumbar apex reference point ( 16 ) above the hip point along the torso line, a lumbar shape reference circle ( 40 ) defined as being behind the torso line and spaced apart therefrom, a forward lumbar prominence line ( 30 ) which is parallel to the torso line and tangential to the lumbar shape reference circle, and a rearward lumbar prominence ( 20 ) line which is parallel to and rearward of the forward lumbar prominence line.