FIELD: load lifting. SUBSTANCE: jack comprises body with rack moving in guides and connected to load platform and has symmetrically-arranged gears. The latter interact with rack teeth. Gear axles carry other meshing gears. One of said gears meshes with auxiliary gear mounted on one of crankshaft journals and provided on the face surface with openings equispaced around the circumference. Jack also has planetary reduction unit whose sun gear has internal gear rim and is installed on the bearing of the other crankshaft journal. Eccentric journal of crankshaft carries satellite pinion with external gear rim meshing with the internal rim of sun gear. Face surface of satellite pinion has pins whose free ends fit into the openings of auxiliary gear. EFFECT: improved design. 2 dwg
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