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:
May. 28, 1991
Filed:
Jan. 16, 1990
Eugene R Speakman, Fullerton, CA (US);
McDonnell Douglas Corporation, Long Beach, CA (US);
Abstract
In this fastening system two or more layers of material are fastened together by inserting a hollow sleeved fastener such as a rivet or a bolt into the hole in a high interference fit to expand the hole radially. The sleeve is configured either as a collar and a straight shank or as an angled upper portion combined with a shank for counterbored applications. The intersections between either the collar and the shank or the angle portion and the staight shank are designed with an enlarged radius such that when the sleeve is expanded after the insertion of the fastener inside of it, this radius is expanded, which in turn stress coins the adjacent edge of the hole in the layers. This localized stress coining as well as the hoop stress in the hole surrounding the hole dramatically increases the fatigue strength of the fastened layers in a structure assembly.