FIELD: mechanical engineering. SUBSTANCE: machine has cylinder which is divided by piston into before-piston chamber and under-piston chamber; rod is run through these chambers and through cylinder cover; rod is articulated with piston and engageable with washer by means of seal; this washer is movably mounted in seat of cover. Machine is double-acting without using a crosshead with guides. EFFECT: simplified construction, reduced overall dimensions and mass. 8 cl, 3 dwg
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