AUFNAHMEDORN FUER VORRICHTUNGEN ZUM ABSTECHEN VON RINGEN VON EINE UNDEHNBARE EINLAGE AUFWEISENDEN SCHLAEUCHEN ODER ROHREN AUS GUMMI, KUNSTSTOFF ODER AEHNLICHEM MATERIAL

摘要

A mandrel or work-piece holder for a tubular blank. The tubular blank may be penetrated by cutting means to provide endless annular elements such as belts for drive or power transmission uses. The mandrel comprises a supporting core having a concentrically arranged radially expandable layer formed by a spirally wound hose. The hose is connected to a source of an inflating medium. Concentric with the hose layer and firmly connected thereto is an intermediate layer of an elastic material. Concentric with the intermediate layer and removable connected thereto is an outer layer of an elastic material. The elasticity of the several layers varies such as to radially decrease.