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:
Nov. 18, 2008
Filed:
Jun. 23, 2006
Gerhard Neubauer, Königsberg, DE;
Gerhard Neubauer, Königsberg, DE;
Unicor GmbH, , DE;
Abstract
An apparatus for producing double-walled composite tubes, which have an outer wall with wave peaks and wave valleys and a smooth inner wall, includes two of rows first and second shaping-jaw halves which, along a common shaping section, form a shaping tunnel. The first shaping-jaw halves are located opposite each other in the shaping section and have an inner contour forming a tube socket portion. The second shaping-jaw halves, also located opposite each other, include transverse grooves alternating with transverse fins. A sizing mandrel, which defines narrow vacuum grooves spaced apart from one another in the axial direction on its outer lateral surface, projects into the shaping tunnel and forms the smooth inner wall of the composite tube. A vacuum control valve device provides for defined closure and reopening of the vacuum grooves when positioned in correspondence with the tube socket portion.