Patent ID: 7478468

Claim:
A method for production of a rim hole in a hollow profile comprising: punching two opposite holes out of a hollow profile, at least one of the two holes having a diameter which is smaller than that of the rim hole to be produced, by interaction of a perforating die pushed into the hollow profile, and two opposite perforating punches between which the hollow profile lies, pushing a tubular piece into an interior of the hollow profile in such a way that the tubular piece coaxially surrounds the location of the rim hole to be produced and comes to lie there coaxially to a common axis of the opposite holes, and drawing hollow profile material of of a section the hollow profile located between an edge of at least one of the opposite holes and an inside of the tubular piece into the hollow profile interior by at least one punch until said hollow profile material bears flat against the inside of the tubular piece so as to form the rim hole.