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:
Sep. 06, 1988
Filed:
Mar. 27, 1987
Hugh Fader, Berkley, MI (US);
Ralph S Shoberg, Brighton, MI (US);
Other;
Abstract
A method and apparatus for accurately determining the previously applied torque to a threaded fastener. Torque is increasingly applied to the fastener and measured periodically. The measurements are digitized and stored in a microprocessor. The torque previously applied is the torque that causes the fastener to breakaway or start to begin to turn. This breakaway point is the torque corresponding to a change in the slope of the applied torque-time relationship. The breakaway point is determined by determining the maximum different value between the measured torque and a mathematical line segment commencing from below the breakaway point and extending to the peak torque applied. The breakaway point (or applied torque) is the torque corresponding to the calculated maximum difference value.