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. 06, 2005
Filed:
Oct. 27, 2000
Seppo Takala, Belchatow, PL;
Marek Warcholinski, Belchatow, PL;
Seppo Takala, Belchatow, PL;
Marek Warcholinski, Belchatow, PL;
Oy KWH Pipe AB, , FI;
Abstract
This invention concerns a method and an apparatus for making a spirally-wound tube from a hollow thermoplastic profile () having a substantially rectangular cross-section, which method comprises the steps of: winding the thermoplastic profile () around a drum () and joining adjacent loops together by welding, and smoothing the outer weld joint () by means of extra heat and a smoothing body resting against the weld joint (). The invention is characterized in that the thermoplastic profile (), when fed to the drum (), comes onto a stationary first section () comprising spaced sliding means () arranged along the periphery, on which section welding is performed, after which an inner weld joint () thus formed is arranged to run along a spiral groove () running around the stationary first section (), whereby the inner weld joint (), as well as the outer weld joint (), are treated by using extra heat and a stationary smoothing body () resting against it, and that the tube, once both of the welded surfaces () have been smoothed, is transferred to a rotary driven drum section () causing the tube to rotate and generating the winding motion of the thermoplastic profile ().