Position measuring system for a hydraulic cylinder

Details Position measuring system for a hydraulic cylinder Position measuring system for a hydraulic cylinder

2007-03-07

2009-12-15

Leslie, Michael (Department: 3745)

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

Reexamination Certificate

active

07631592

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.

REFERENCES:
patent: 5012239 (1991-04-01), Griebeler
patent: 5450009 (1995-09-01), Murakami
patent: 6393963 (2002-05-01), Kadlicko
patent: 7116097 (2006-10-01), Revankar et al.
patent: 7367257 (2008-05-01), Kadlicko
patent: 0618373 (1994-10-01), None

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