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:
Apr. 20, 1976
Filed:
Dec. 10, 1973
Eugene R Speakman, Fullerton, CA (US);
McDonnell Douglas Corporation, Long Beach, CA (US);
Abstract
A stress coining fastened joint, for minimizing stress concentration in a wall of an aperture in a metallic structural member, the tool being a rigid elongated shaft adapted for forcible insertion through the aperture. The shaft has end portions and is provided with a plurality of different diameter, annular protuberances spaced intermediate the end portions. The largest of the protuberances has a diameter of such predetermined relationship to the diameter of the aperture, that upon a forced insertion thereof through the aperture the material forming the wall of the aperture is displaced radially substantially the difference between the diameter of the largest protuberance and the diameter of the aperture. The displaced material will thereafter rebound approximately one-half of the initial displacement. The stress coining tool may be combined with a conventional fastener to provide a simultaneous stress coining and fastening operation.