Patent ID: 9511408
Filing Date: 2016-12-06
CPC Classification: B21D

Claim Text:
1. A tube expanding drum machine, comprising a support frame; at least one drum rotatably supported in said frame; means for rotating said drum about its axis; a flexible pipe-expanding shaft wound on a mobile inner part of said drum and having a first end fixed to said drum; an expanding mandrel or bullet-shaped body, connected to a second end of said flexible pipe-expanding shaft, suitable for widening the diameter of a pipe by winding or unwinding said flexible pipe-expanding shaft onto or from said drum inside the pipe; and automatic lubrication means of the inner surface of the pipe during the pipe expansion arranged inside said flexible shaft, said automatic lubrication means comprising a flexible lubrication duct inserted inside said flexible pipe-expanding shaft and a fitting arranged in said drum, to which a first end portion of said lubrication duct is connected, said duct comprising a second end portion communicating with a body passage arranged in said expanding mandrel or bullet-shaped body, wherein said flexible pipe-expanding shaft comprises a helical spring, and wherein said flexible pipe-expanding shaft comprises an actuation cable of said expanding mandrel or bullet-shaped body, arranged inside said flexible pipe-expanding shaft.