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:
May. 08, 1990
Filed:
Aug. 29, 1988
Applicant:
Inventor:
Peter Kunz, Schaffhausen, CH;
Assignee:
George Fischer AG, Schaffhausen, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B29D / ;
U.S. Cl.
CPC ...
264 85 ; 156156 ; 1563042 ; 1563046 ; 264 25 ; 264248 ; 264521 ; 264573 ; 264D / ; 4251744 ; 425503 ; 425508 ; 425D / ;
Abstract
A gaseous medium, preferably compressed air or nitrogen, is introduced into the interior of the tubular components to be welded together from one end and is discharged at the other end through a throttled outlet opening. As a result, an excess pressure is built up in the interior of the tubular components and the inner wall of the components is cooled. When heating the abutting ends of the tubular components by means of a heating device, the ends are not melted entirely through to the inner walls, so that the formation of an inner welding bead is avoided and the internal pressure creates a welding pressure.