FIELD: medical engineering. SUBSTANCE: two frames 1, 2 are coupled to each other for reciprocal motion. Front 4 and rear 3 wheels are positioned on frames in pairs. Provision is made for device of stepless variation of wheelbase when overcoming the flights. Device includes electric drive 5 connected to control system which has at least two position pickups 12 and 13 of axles of front 4 and rear 3 wheels relative to flight steps. Pickups 12 and 13 have moving parts which may contact the nearest step, thereby improving the operational characteristics of armchair. EFFECT: simplified conditions of operation, reduced invalid's fatigue. 6 cl, 6 dwg
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