Method and apparatus for controlling positioning of an...

Excavating – Ditcher – Condition responsive

Reexamination Certificate

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Details

C037S348000, C037S414000, C037S382000, C701S050000, C091S361000

Reexamination Certificate

active

06951067

ABSTRACT:
An apparatus for controllably positioning a work implement of an earth moving machine is disclosed. The work implement includes a boom and an attachment being attached thereto where the boom is actuated by a hydraulic lift cylinder and the attachment is actuated by a hydraulic tilt cylinder. Implement position sensors sense the elevational position of the boom and the pivotal position of the attachment and responsively produce respective implement position signals. A controller that receives the implement position signals, compares the relative position of the boom and the attachment with a pre-determined boundary condition, and produces an electrical valve signal. A valve assembly receives the electrical valve signal and controllably provides hydraulic fluid flow to the respective hydraulic cylinders in response to a magnitude of the electrical valve signal.

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