Patent ID: 8984926
Filing Date: 2015-03-24
Classification: B21D,Y10T

Abstract:
1. A machine for the expansion of pipes, comprising: a machine frame equipped with an expansion mandrel and at least one drive unit for pressing or pulling the expansion mandrel through a pipe; the at least one drive unit including at least one motor-driven drum and at least one band or wire guide which extends from an outlet of the at least one motor-driven drum and forwardly to the pipe, said at least one motor-driven drum being adapted to press or pull a band or a wire with the expansion mandrel through the pipe, wherein the expansion mandrel is expandable, and wherein the at least one motor-driven drum comprises two lateral plates, a hub disposed between the two lateral plates and equipped with a band or a wire along an outer rim of the hub, and a circular guideway, said hub comprising a driving gearwheel and at least two idling gearwheels arranged internally in and in engagement with a toothed rim in the hub, and wherein the circular guideway of the drum is formed by bearings disposed in a circle between the lateral plates of the drum and along the outer rim of the hub.