The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1976
Filed:
Oct. 07, 1974
Gerd PH. Lupke, Thornhill, Ontario, CA;
Other;
Abstract
A high speed corrugator for producing corrugated thermoplastic tubing comprises a pair of complementary upper and lower mold assemblies each comprising an endless chain of articulately interconnected mold blocks and means for guiding the mold blocks along an endless track having a forward run and a return run, each mold block being complimentary to a respective mold block of the other assembly, the mold blocks co-operating in pairs along said forward run to form an axially extending tunnel defining a tubular mold having a corrugated wall. The mold assemblies are positioned so as to locate the extrusion head at the entrance to the tunnel coaxially therewith, and extruded thermoplastic material is expanded by blow molding to conform to the interior surface of the mold. Cooling air is fed along an air distributor duct extending along the tunnel for cooling the molded thermoplastic, the cooling air being divided from the blow molding air by a baffle. Each mold assembly further comprises an air distributing duct extending along the return run of the endless track and positioned to distribute cooling air to the exposed interior faces of the mold blocks.