Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1996-09-25
1999-04-27
Underwood, Donald W.
Material or article handling
Vertically swinging load support
Shovel or fork type
60469, 91433, 414719, B66F 900
Patent
active
058972870
ABSTRACT:
A control system for improving the roadability of a wheeled excavator is disclosed herein. The excavator is the type including an implement such as a bucket or backhoe which is moved relative to the excavator by hydraulic actuators. Hydraulic fluid is applied to the actuators via electronic valves which are controlled by an electronic controller. Based upon acceleration of the vehicle, the electronic controller controls the electronic valve to maintain fluid pressure in the actuator or the acceleration substantially constant. Additionally the controller can be configured to maintain the average position of the implement generally constant. By controlling the pressure in the hydraulic actuator, the undesirable bouncing or pitching of the excavator can be reduced when the vehicle is traveling at road or loading speeds.
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patent: 4995517 (1991-02-01), Saotome
patent: 5034892 (1991-07-01), Saotome
patent: 5147172 (1992-09-01), Hosseini
patent: 5195864 (1993-03-01), Drake et al.
patent: 5520499 (1996-05-01), Ufneil et al.
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Berger Alan D.
Patel Ketan B.
Case Corporation
Underwood Donald W.
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