A lumbar support structure comprises a resilient grid formed of flexible vertical members and horizontal cross members. The grid is fixed in a seat, such as a car seat, and includes an upper back section and lumbar section. The lower end of the lumbar section is fixed and the upper end of the lumbar...http://www.google.sh/patents/US5651584?utm_source=gb-gplus-sharePatent US5651584 - Lumbar support structure for automotive vehicle
