Seat with adjustable lumbar support

摘要

The seat comprises a seat base, and a seat back supported on a seat back frame having a first end attached to the seat base and a first lateral portion opposite from it. There is an articulating frame having right and left second ends disposed adjacent to the seat base and upwardly extending right and left portions extending beyond the first lateral portion of the seat back frame to a second lateral portion interconnecting the right and left upstanding portions. There is a fastening device disposed on the right and left upstanding portions of the articulating frame, the fastening device being adapted to pivotally support the articulating frame from the first lateral portion of the seat back frame. There is a pelvic support member having a first edge disposed on a pivot rod extending between the right and left second ends of the articulating frame. There is also a lumbar support member attached to the pelvic support member opposite the pivot rod, and a thoracic support member attached to the lumbar support member opposite the pelvic support member and a cylindrical portion opposite the lumbar support member.