Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Reexamination Certificate
2007-10-02
2007-10-02
Leslie, Michael (Department: 3745)
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
C092S012200, C091S001000
Reexamination Certificate
active
11440636
ABSTRACT:
In a variable displacement type hydraulic pump/motor assembly including at least one internally movable component, such as a yoke, a swashplate, and the means for moving the swashplate, the improvement includes imparting on this component absolute location indicia markings and the addition of an optical/electronic sensor unit capable of reading such indicia markings fixedly located on a housing of the pump/motor assembly and including an optical read head extending into the housing interior and located at a spaced distance from the indicia markings for reading same, relative to a reference location, and producing a signal indicative of the absolute position of the movable component. The signal can then, in turn, be used for controlling the displacement of the pump/motor assembly. A method for determining the absolute component position is also set forth.
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Chapman Eric B.
Kovach Joseph A.
Larkin Bruce D.
Nguyen Dan T.
Simon Matthew H.
Leslie Michael
Parker-HannifinCorporation
Pophal Joseph J.
Whitman Daniel J
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