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. 15, 2009
Filed:
Mar. 07, 2007
Applicant:
Gerhad Kossmann, Weisweil, DE;
Inventor:
Gerhad Kossmann, Weisweil, DE;
Assignee:
Liebherr-France SAS, Colmar Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01B 31/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
This invention relates to a position measuring system for a hydraulic cylinder, which comprises at least one sensor, one magnet and a piston rod with a metallic core of high magnetic susceptibility and with a groove structure in substantially axial direction, wherein the groove structure is filled up with a metal which has a lower magnetic susceptibility than the core, so that the sensor measures a magnetic field of the core which is changed by the groove structure and thus can determine both the relative and the absolute position of the piston rod.