Patent ID: 8220302

Claim:
Device for manufacturing bimetallic pipes, each of said pipes being made up starting from an inner pipe telescopically inserted with clearance inside an outer pipe and projecting from both ends of the latter, characterised in that it comprises: a fixed head and a moveable head suited to receive the ends of the bimetallic pipe, the fixed head being provided with an inlet for the supply of an operating fluid from a respective vat and the movable head being provided with an outlet for the discharge of the fluid; clamping members provided inside each head to perform the hydraulic closure around each end of the outer pipe; a sealing device provided inside each head, the sealing device comprising a threaded sleeve, a gasket and a centring bushing, the gasket and centring bushing being inserted coaxially inside the threaded sleeve, an almost cylindrical element being inserted inside the centring bushing for the abutment of the end of the inner pipe, in order to seal each end of the inner pipe; an elastic abutment provided inside each of said heads for the positioning of the ends of the inner pipe, so that the inner pipe is free to move axially and radially and rotate around its own axis for preventing the bending or damaging of the pipes to be made; a hydraulic piston controlled by a valve for setting the movable head in motion; and a pressure multiplier connected to the fluid circuit for compressing the fluid inside the pipe to be made.