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:
Nov. 13, 2001
Filed:
Aug. 10, 2000
Tobias Axel Lindback, Huddinge, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
A method for determining the axial load in a threaded fastener when tightened above its yield point by using the variation in travel time (&Dgr;t) for ultrasonic waves induced in the fastener to determine the axial load (N) in the fastener, both in the yield point and at the final pretension state of the fastener. The yield point of the fastener is detected by indicating a significant change in the growth of the momentary transferred torque per angle unit of rotation, and comparing the actual travel time (&Dgr;t) for ultrasonic waves in the fastener to a pre-tightening determined relationship between the axial load (N), the rotation angle (&PHgr;) and the ultrasonic wave travel time (&Dgr;t) for the actual type of fastener.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile