Dressler, Goldsmith, Shore, Sutker & Milnamow, Ltd.
Pressure-compensating hydraulic system for preventing unauthorized use of a material handling implement
 A pressure-compensating hydraulic system is disclosed for preventing unauthorized use of an associated material handling implement. The system includes a variable displacement hydraulic fluid pump, and a load-sensing pressure-compensator for varying the output of the pump responsively to the pressurized fluid demands of the system. In order to prevent unauthorized use of the associated implement, the invention contemplates the provision of an override mechanism for negating the demand-responsive characteristics of the system. In this manner, a movable member of the implement, such as one of its stabilizers or its loader bucket, is positioned so as to immobilize the implement, with the member thus maintained in this position since the system will not respond to the demand for pressurized fluid to move the member from this immobilizing condition. 
J. I. Case Company
B Y
B60R Y10T
inventional additional
Thomas R. Roger D.
Brown Mickelson