Equipment with hydraulically driven electrical over...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 21/08 (2006.01) G05D 16/20 (2006.01) G08C 17/00 (2006.01)

Patent

CA 2717112

Motorized vehicles having hydraulic tools as attachments are well known. Examples includes road graders, excavators, snow ploughs (and nursery equipment such as tree spades, tree movers and tree handling equipment), tractors, front loaders, and skid steers. A single hydraulic tool may be controlled by a simple manually operated hydraulic control system if the operation of the hydraulic tool is not complex. The use of "Electric over Hydraulic control" is more commonly used for hydraulic attachments with more complex functionality. A typical electric over hydraulic control system uses a bundle of wires; in which each wire in the bundle is dedicated to a particular operational feature of the attachment. These wires are prone to failure as a result of the wear and tear they are exposed to during normal use of the equipment. This, in turn, has led to proposals for the use of a wireless control system. The power for a wireless control system may be provided by a battery, however, a battery operated system may also not be robust enough to stand up to the wear and tear caused by operation of the equipment. These problems are mitigated by the present wireless, electric over hydraulic control system in which the electric power to operate the wireless control system is provided by an electrical generator that is driven by hydraulic fluid. The present invention is especially advantageous for the operation of nursery equipment in which several different hydraulic attachments are used with a single motorized vehicle and where the different attachments must be disconnected and re-connected to allow use thereof.

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