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:
Feb. 06, 2001
Filed:
Mar. 12, 1999
Thomas G. Skinner, Aurora, IL (US);
Hans P. Dietz, Naperville, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An apparatus for controllably moving a work implement of an earth moving machine is disclosed. The work implement includes a boom and a bucket being attached thereto where the boom is actuated by a hydraulic lift cylinder and the bucket is actuated by a hydraulic tilt cylinder. An operator controlled joystick produces an operator command signal for controlling the movement of the work implement. Implement position sensors sense the elevational position of the boom and the pivotal position of the bucket, and responsively produce respective implement position signals. A controller receives the implement position and operator command signals, determines the instant position of the work implement, reduces the operator command signal as the boom is being raised and the bucket is being pivoted, and produces an electrical valve signal based on the reduced operator command 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.