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. 26, 1997
Filed:
Feb. 12, 1996
Applicant:
Inventors:
Mikhail Braginsky, Minneapolis, MN (US);
Leon Dashevsky, Plymouth, MN (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D / ; B23P / ;
U.S. Cl.
CPC ...
29898053 ; 29898069 ; 298991 ; 29463 ; 2281145 ; 228-23 ; 228113 ; 384 49 ; 384445 ; 384491 ;
Abstract
Hollow ball bearings of improved strength and uniformity are produced by causing identical first and second hemispheric units to rotate at different speeds in facing relationship upon a common axis, and forcing the hemispheres into aligned contact. The frictional heat generated by such contact melts the material adjacent the open rim of each contacting hemisphere. The molten material is distributed by centrifugal force about the interior of the hemispheres. The speeds of the two hemispheres are then equalized with attendant cooling and re-solidification of the molten material, thereby producing a hollow sphere.