PNEUMATIC ADJUSTMENT SYSTEM FOR SEAT BACK PANEL

摘要

A pneumatic system for adjusting the thickness or projection of a portion of a seat back, as for example the lumbar section of the back of a seating unit. A self-fillable air reservoir is provided by a foam-filled airtight envelope that will be positioned under the seat portion of the seating unit and this envelope is connected through conduit means and associated valving means to a small volume adjustable bladder portion in the seat back. A special conduit and valving arrangement may also be provided to have the air withdrawn from the seat back bladder portion into the air reservoir envelope so as to deflate the back support portion where there is no seat occupant.