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. 14, 1976
Filed:
Dec. 01, 1975
Applicant:
Inventors:
Herbert Krips, Bochum-Langendreer, DT;
Miroslav Podhorsky, Bochum-Linden, DT;
Assignee:
Balcke-Durr Aktiengesellschaft, Ratingen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ; B23P / ;
U.S. Cl.
CPC ...
291574 ; 2920 / ; 2942 / ;
Abstract
A method of hermetically swaging tubes into the bores of heavy heat exchanger tube plates, by first expansion-swaging the inserted tube end portion under a very high hydraulic pressure and by then roll-swaging a portion of the expansion-swaged length portion, in order to replace the expansion-related tensile stress in the tubes with a compressive prestress, and in order to eliminate annular crevices at the inner edges of the tube plate bores.