Apparat til frembringelse af huller i bølgedalene i bølgerør af formstof, navnlig til dræningsformål.

摘要

A device for cutting holes within the wave troughs of a corrugated tube for drainage purpose in which tool supports are geared with the waves of the tube. These tube supports are in one embodiment arranged along endless chains. Preferably there are provided two endless chains with one of their branches opposite to one another and with two respective tool support means facing one another and having gripping jaws enclosing the tube.