FIELD: petrol mechanical engineering. SUBSTANCE: flexible shaft contains two springs. Turns of one of the spring are between turns of the second spring and provided with projections free for interacting. The springs are polygonal in cross-section. Turns are perpendicular to the axis of the shaft. The projections are made of stepped bends of the spring turns. The stepped bends are perpendicular to the spring axis and forms lead of the spring turns. Flexible hose can be inserted to the shaft. EFFECT: enhanced wear resistance, rigidity, and efficiency. 2 cl, 1 dwg
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