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:
Jun. 19, 1984
Filed:
May. 03, 1983
Applicant:
Inventors:
Joseph J Schneider, Kanata, CA;
Robert A Kaucic, Newark, DE (US);
Assignee:
AMCA International Corporation, Hanover, NH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
228151 ; 2281 / ; 72368 ; 72482 ; 72406 ; 242117 ; 254312 ;
Abstract
This invention relates to improved apparatus and process for manufacture of tunnel modules and tunnel sections used to build underwater tunnel tubes. A collapsible fixture is situated to roll up flat steel plate into a circular shell for the tunnel modules. A hydraulic cylinder is utilized to adjust the diameter of the fixture without collapsing it, in order to close any gaps between the ends of the plate when it is rolled into a shell.