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:
Aug. 18, 1987
Filed:
Nov. 26, 1985
Otto Berg, Asker, NO;
Ardal OG Sunndal Verk A.S., Oslo, NO;
Abstract
An aluminum alloy wheel rim is formed to a desired finished size by pressing a sheet of aluminum alloy material to form a wheel rim having a diameter less than, but not smaller than 98.7% of, the desired finished size. The wheel rim then is subjected to a solution heat treatment operation and thereby is expanded to a diameter of a size greater than the desired finished size. The wheel rim then is positioned, while substantially at the temperature thereof when removed from the solution heat treatment, in a calibration tool in the form of two dies on a common arbor, with the dies being located to define the desired finished size. The wheel rim then is cooled to cause the rim to shrink tightly onto the dies to the desired finished size without the necessity of applying pressure to the rim.