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:
Apr. 10, 1990
Filed:
Aug. 27, 1987
Hans Bergheim, Bonn, DE;
Winfried Griep, Bonn, DE;
Vereinigte Aluminum-Werke A.G., Bonn, DE;
Abstract
Disclosed herein is a compound joint in which a lower section and an upper section are mated along a common contact plane. Means for positively interlocking the sections are provided in each section. A depressed area on the surface of each of the sections is oriented along the common contact plane, such that when the sections are interlocked, the depressed areas form an enclosed tube. A spreader tube comprising a metal that undergoes cold work hardening during expansion can be positioned within the enclosed tube, whereby the expansion of the spreader tube within the enclosed tube to a volume larger than the volume of the enclosed tube causes said interlocked sections to be permanently jointed.