Abstract: A "G" seat for providing kinesthetic (sensation of motion) cues to a pilot of a simulated aircraft. The seat is designed specifically to stimulate elements of the haptic sensory system and is capable of independently producing desired skeletal attitude shifts, area of flesh contact changes and flesh pressure gradient variations and coordinating same to simulate acceleration effects. The seat contains two mosaics of air cells forming a seat cushion and a back cushion, respectively. The air cells comprise tension spring loaded bellows having rigid top plates. The top plates of the cells in each mosaic form a body supporting surface of the corresponding cushion. The cells may be individually driven under computer control to vary the elevation, attitude and shape of these body supporting surfaces. In addition, clam-shell shaped air cells are positioned on either side of the seat cushion to provide thigh pressure and area of contact variations and a lap belt is driven to provide ventral area pressure variation.

Abstract: This invention relates to apparatus for periodically automatically purging the contaminants from a filter unit of a compressed air system to reactivate the filtering medium in the filter unit during the time that an air compressor for supplying air under pressure to the system is operating unloaded or is stopped.