FIELD: transport engineering; seats for tractor drivers with adjustable backrests. SUBSTANCE: seat has flexible backrest which makes it possible to follow line of driver's backbone in contact with seat backrest. Fixing of backrest by means of friction in link members makes it possible to protect driver's backbone at abrupt impact in direction of longitudinal plane and ensure safety of driver. EFFECT: improved safety of drivers of tractors and other agricultural machines. 3 dwg
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