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:
Dec. 19, 1995
Filed:
May. 18, 1994
Applicant:
Inventors:
Gary L Wells, Kalamazoo, MI (US);
James R Dehlinger, Ada, MI (US);
Donald R Rigsby, Jenison, MI (US);
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
B21D / ; B21D / ;
U.S. Cl.
CPC ...
29 3 / ; 294211 ; 29512 ; 72 61 ; 72 62 ;
Abstract
A method and apparatus capable of forming a dual tube conduit having a predetermined outer tube dimension, a predetermined inner tube dimension, and a predetermined gap between the tubes. A dual tube workpiece may be initially bent in one or more zones to a desired nonlinear configuration, the inner and outer tubes are hydroform expanded simultaneously to obtain the selected inner tube dimension, and the outer tube is then hydroform expanded to the desired outer tube dimension and to the desired gap therebetween, while the inner tube is held constant.