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:
Dec. 16, 2014
Filed:
Jun. 08, 2011
Rolf Carlsson, Hallstahammar, SE;
Christer Johansson, Gothenburg, SE;
Fredrik Ahrentorp, Gothenburg, SE;
Christian Jonasson, Gothenburg, SE;
Jakob Blomgren, Gothenburg, SE;
Rolf Carlsson, Hallstahammar, SE;
Christer Johansson, Gothenburg, SE;
Fredrik Ahrentorp, Gothenburg, SE;
Christian Jonasson, Gothenburg, SE;
Jakob Blomgren, Gothenburg, SE;
Rocan System AB, , SE;
Abstract
A device and method for indicating if a fastening element upon fastening to a piece has reached a tensile yield limit load. The fastening element includes a threaded shaft having a magnetostrictive material. The device includes a mechanism for generating an alternating magnetic field that penetrates the shaft, a mechanism for measuring a physical quantity that depends on the momentary magnetic susceptibility of the shaft and a control unit adapted to detect a significant change of the physical quantity and determine and indicate if the shaft of the fastening element has reached the tensile yield limit load.