FIELD: transport.
SUBSTANCE: invention relates to machine building. Chassis consists of two driven wheels 1, 2 arranged on every side of the vehicle. Wheels 1, 2 have flanges 3, 4 articulated with drive side roller 5. Air castor 7 aligned with said roller 5 is fitted on drive axle 6. Air castor 7 features free bilateral rotation and has no articulation with roller 5. Note that its diameter is commensurable with that of wheels 1, 2.
EFFECT: easier motion over flights of stairs.
2 cl, 1 dwg
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