Patent ID: 7614133
Filing Date: 2009-11-10
Classification: B21D,F15B,F16J,Y10T

Abstract:
1. A method for manufacturing a jack or hydraulic, pneumatic and/or oleopneumatic cylinder comprising a cylindrical tubular body ( 4 ) with a bottom ( 1 ) fastened to a first end of the tubular body ( 4 ), a head ( 5 ) fastened to a second end of the tubular body ( 4 ), and a piston ( 2 ), integral with a rod ( 3 ), configured to slide within an inside of the tubular body ( 4 ), comprising: fastening, in an irremovable way, the head ( wherein said plastic deformation guarantees a mechanical seal of a coupling between the tubular body ( wherein said controlled plastic deformation is performed by means of mechanical rolling upon said tubular body, said tubular body being free to rotate about a central, longitudinal axis through said tubular body, wherein the mechanical rolling is performed by anchoring the tubular body, preassembled with the head and the bottom, to at least a special multiroller head comprising a plurality of shaping rollers (R wherein the rollers (R