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. 15, 1978
Filed:
Feb. 09, 1977
Robert August Kraus, Tustin, CA (US);
Edmund Joseph Kraus, Tustin, CA (US);
Other;
Abstract
A device for the sensing and the measuring of the axial tension stresses occurring within the bolt of a threaded fastening system under installation comprising a metallic, electrically conductive flat washer-like first member, and a metallic, electrically insulated flat washer-like second member; wherein the electrically insulating material of an anodic-oxide coating, which is grown onto the second member's electrically conductive aluminum base material, is used as an intervening solid supporting substance for the purpose of spacing the first and the second member's electrically conductive surfaces, through a predetermined distance from each other, to resist a current flow therethrough; wherein, due to the anodic-oxide coating's minute compressibility under varying light to severe compressive load conditions, a change in the oxide coating's electrical leak-resistance occurs, thus allowing a very minute, detectable current to flow between the first and the second member. The minute electric current is electronically detected, measured and displayed.