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:
Jul. 16, 1980
Applicant:
Inventor:
Ivano G Cudini, Woodstock, CA;
Assignee:
Standard Tube Canada Limited, Woodstock, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21K / ;
U.S. Cl.
CPC ...
72370 ; 72343 ;
Abstract
A tube with a thick walled portion at one end is cold-formed by necking one end of a tube workpiece, inserting a mandrel which engages within the tapering neck of the necked portion, drawing the necked workpiece through a drawing die by applying pressure on the mandrel, and withdrawing the mandrel from the workpiece. A thick-walled portion may be formed at the opposite end by interrupting the drawing operation, inserting a second mandrel of smaller diameter with a shoulder engaging in the tapering neck of the workpiece, continuing the drawing to draw the remainder of the workpiece down onto the second mandrel, and withdrawing the second mandrel.