Abstract: A pneumatically adjustable bladder system (90) for use in a cushioned seat bottom (24) has one or two rear foam filled bladders (62, 64) for location under the ischial tuberosities of a seated occupant of the seat bottom, and one or more expansion chambers (14, 16) or front foam filled bladders (66, 68) for location under the thighs of the seated occupant. There are air passageways (70, 72, 74, 92) interconnecting the bladders with each other or with an expansion chamber. The system is air tight and the bladders are compressible under the weight of the seated occupant and are expandable when the weight is removed. The compression of a bladder causes air therewith in to be displaced through the air passageways to the expansion chambers or to the other bladders, which then expand.

Abstract: A pneumatically adjustable bladder system (90) for use in a cushioned seat bottom (24) has one or two rear foam filled bladders (62, 64) for location under the ischial tuberosities of a seated occupant of the seat bottom, and one or more expansion chambers (14, 16) or front foam filled bladders (66, 68) for location under the thighs of the seated occupant. There are air passageways (70, 72, 74, 92) interconnecting the bladders with each other or with an expansion chamber. The system is air tight and the bladders are compressible under the weight of the seated occupant and are expandable when the weight is removed. The compression of a bladder causes air therewith in to be displaced through the air passageways to the expansion chambers or to the other bladders, which then expand.

Abstract: A chair or seat comprising seat back (11) and seat bottom (10) is provided with one or more self inflatable devices (12) inserted therein. Each inflatable device comprises a flexible, open celled foam filled bladder connected to a control valve (13), and optionally, a bleed valve (27). Control and bleed valves can either be incorporated into the seat back or seat bottom or they can be provided in a remote panel (30) for operating the degree of inflation of the self inflatable devices. The control valves and bleed valves may be manually valves, or they may be electric valves incorporating solenoids. Electric valves can be used in combination with vehicle's electrical and central locking systems to provide for the automatic reinflation and preservation of personal settings.