Apparatus for manufacturing perforated tubes

Claim 1

Apparatus for forming perforations in the wall of a corrugated plastic tube having hollow projections provided thereon, said apparatus comprising a stationary frame, at least one guide sleeve fixed thereto and having an interior defining an internal guide for a tube to be fed therethrough, a drive wheel rotatively mounted on a terminal end of the sleeve and projecting axially outward therefrom, said wheel, beyond said terminal end, having a central bore forming a continuation of the guide dEfining interior of the sleeve and a guide for the tube passing therethrough, said wheel provided with drive means for rotating said wheel relative to said sleeve and the tube as the tube is moved through the sleeve, at least one knife blade positioned on the wheel outward of said terminal end and projecting into the bore of the wheel inward of the ends thereof in the path of the tube projections tangentially with the circumference of the tube, whereby movement of the tube through the terminal end of the sleeve and the wheel while simultaneously rotating the wheel will cause the blade to intersect the projections and cut the same away from the tube and expose the perforations.