Land vehicles: dumping – Tilting – Operating mechanism
Reexamination Certificate
2008-04-11
2009-10-20
Gordon, Stephen (Department: 3612)
Land vehicles: dumping
Tilting
Operating mechanism
C298S02200C
Reexamination Certificate
active
07604300
ABSTRACT:
The present invention relates to a dump truck or large mining truck, comprising a dump body for the transport of overburden or the like, a first hydraulic circuit having a first pump device for the actuation of the dump body as well as a second hydraulic circuit having a second pump device for the actuation of a steering and/or of a braking device of the dumper truck chassis and/or an auxiliary truck element. In accordance with the invention, the first, second and/or a further hydraulic circuit having are connected to one another by a valve device which is controlled by a control device such that the plurality of hydraulic circuits cooperate in an unloading mode and actuate the dump body together and, on the other hand, the hydraulic circuits work separately in a travel mode so that the second hydraulic circuit and/or any further hydraulic circuit is separated from the dump body and its actuator device. The performance of the pump devices are added so-to-say by the combination of the hydraulic circuits, whereby a fast unloading of the dump body can be achieved despite the huge load. On the other hand, the valve device can uncouple the hydraulic circuits from one another, whereby the second hydraulic circuit can be utilized specifically only for the steering and/or the braking device in the travel mode.
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Whitfield, Jr. James Arthur
Yates Michael Kelly
Dilworth & Barrese LLP
Gordon Stephen
Liebherr Mining Equipment Co.
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