Hydraulic cylinder with position encoder

Details Hydraulic cylinder with position encoder Hydraulic cylinder with position encoder

2008-05-06

2008-05-06

Lopez, F. Daniel (Department: 3745)

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

Reexamination Certificate

active

07367257

ABSTRACT:
An actuator has a position encoder provided by a helical groove formed in the piston rod. The groove is filled with a material of different magnetic characteristics to provide a smooth exterior surface and a varying discernible signal as the rod moves relative to the cylinder. An array of Hall effect sensors is provided around the rod to provide phase shifted signals as the rod moves so that the signal of one sensor may be correlated by the signals of other sensors.

REFERENCES:
patent: 3095785 (1963-07-01), Cahill
patent: 3956973 (1976-05-01), Pomplas
patent: 4471304 (1984-09-01), Wolf
patent: 4717874 (1988-01-01), Ichikawa
patent: 5012239 (1991-04-01), Griebeler
patent: 5450009 (1995-09-01), Murakami
patent: 5455509 (1995-10-01), Semura et al.
patent: 6393963 (2002-05-01), Kadlicko

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