Corrugated drainage tubing and method and apparatus for making d

Details Corrugated drainage tubing and method and apparatus for making d Corrugated drainage tubing and method and apparatus for making d

1979-01-22

1981-06-02

Hinson, Harrison L.

Gear cutting, milling, or planing

Milling

Means for internal milling

82 82, 83 54, 83187, 409228, 409307, B23D 500, B26D 300, B23B 500

Patent

active

042708788

ABSTRACT:
A thermoplastic corrugated drainage tube comprising annular peaks and valleys and a plurality of drainage openings internally cut about the circumference of each valley, the openings in each valley aligned with the openings in successive valleys along helical lines described by said openings. The method of forming the drainage openings comprises placing a cutting tool in the interior of the tubing and rotating the tool while moving the tubing axially past the tool. The cutting tool comprises a body having a plurality of radially projecting cutters spaced equidistantly about the cutter body and means for rotating the tool.

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