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:
Dec. 23, 2003
Filed:
Oct. 09, 2001
Oy KWH Pipe Ab, Helsinki, FI;
Abstract
A method for preparing an end of a thermoplastics tube ( ) is provided, wherein the tube is manufactured by spirally winding and welding together of a hollow profile ( ) having a substantially rectangular cross section. The method includes the following steps: cutting the end of the tube by a planar transversal section; extruding a second hollow profile ( ) having a rectangular cross section and an outer shape essentially similar to Fat of the hollow profile ( ) from which the tube ( ) is manufactured; spirally winding the extruded second hollow profile ( ) around a drum having a diameter corresponding to inner diameter of the tube ( ); cutting a loop ( ) from the second hollow profile ( ) in a length corresponding to circumference of the tube end; joining the ends of the loop ( ) to each other, whereby a ring ( ) is formed having the same inner and outer diameters as the spirally wound tube ( ); placing the ring ( ) against the cut tube end; and welding the ring ( ) to the tube end.