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:
Jul. 06, 1982
Filed:
Nov. 20, 1980
Hermann J Kopineck, Dortmund, DE;
Wolfgang Bottcher, Schwerte, DE;
Klaus D Mreyen, Holzwickede, DE;
Werner Borchert, Bochum, DE;
Volker Deutsch, Wuppertal, DE;
Estel Hoesch Werke AG, Dortmund, DE;
Abstract
An electrodynamic sound converter is disclosed for the non-destructive ultrasonic testing of workpieces during relative movement of the workpiece and the testing head. The testing head has an annular electromagnet which produces a magnetic field, and a rod-shaped core extends coaxially through the electromagnet and has a tip which projects beyond the same in direction towards the workpiece to be tested. The core is axially slidable relative to the electromagnet towards and away from the workpiece and the electromagnet and the tip of the core are each independently maintained at a fixed predetermined spacing from a surface of the workpiece being tested. The tip is being biased towards the surface, and a high-frequency coil is located adjacent the tip and serves to produce electromagnetic oscillations. Various modifications are also disclosed.