Mattress construction for pneumatic mattress track system

A pneumatic mattress track system used as a construction element of a vehicle comprising

• a frame, at least two rollers rotatably positioned at opposite ends of said frame,
• a plurality of discrete bags attached to a base,
• said bags and said base defining in combination an endless hollow mattress running around said two rollers,
• an air cushion space defined between the frame and the base, a pressurized fluid is fed into said air cushion space in such a way that a part of the mattress running under the frame is automatically filled with the pressurized fluid through a plurality of inlet orifices,
• each said discrete bag comprising a supporting part attached to the base and engaging part for engagement with the ground, at least two flexible supports crossing the entire interior of said each inflated bag in opposite to each other diagonal directions, one end of each said support is fixedly attached to the bag at an area of junction between the base and the supporting part, a second end of each said support fixedly attached to an area of the engaging part diagonally opposed to said area of junction when the bag is inflated, said supports interconnecting the diagonally opposed parts of each said bag enhancing ability of the bags and the mattress to withstand shear forces resulted during operation of the mattress track system.