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. 15, 1987
Filed:
Jun. 06, 1985
Ernst Meili, Uster, CH;
Karl Rimmele, Schmerikon, CH;
MECAPEC S.A., St. Gallen, CH;
Abstract
Elongated ferromagnetic parts of cylindrical or polygonal cross-sectional outline are tested while rotating about their axes and while advancing longitudinally along a cushion of dry pulverulent magnetic material which is supplied by one or more pneumatic conduits into the range of one pole of a first U-shaped electromagnet whose poles extend in the longitudinal direction of but do not contact the parts. The electromagnet establishes a stray magnetic flux in the region of each defect on the ferromagnetic part which is being tested and such flux or fluxes attract pulverulent material which thereby pinpoints the locations of defects. A second electromagnet is placed next to the one pole of the first electromagnet and its poles are spaced apart from each other as considered in the longitudinal direction of the tested part.