Motors: expansible chamber type – With motive fluid valve – Independent control of bypass between opposed working chambers
Reexamination Certificate
2006-09-12
2006-09-12
Lopez, F. Daniel (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Independent control of bypass between opposed working chambers
C091S451000
Reexamination Certificate
active
07104181
ABSTRACT:
A hydraulic control circuit for a hydraulic cylinder is described for the raising and lowering of a boom on a telescopic loader. First and second chambers of the hydraulic cylinder are connected to a control valve over first and second supply lines and are selectively connected to either a hydraulic pressure source or to a hydraulic reservoir. The circuit includes on-off valves for controlling the flow through a first hydraulic line extending between the first chamber of the cylinder and the hydraulic reservoir, and through a second hydraulic line extending between the second chamber and the hydraulic reservoir in such a way that a floating position can be provided. Furthermore, a load-holding valve arrangement is provided in the first supply line at a location between the control valve and the first chamber of the cylinder. To provide assurance against uncontrolled lowering of the boom during switching to the floating position under load, a valve arrangement is provided that controls the flow rate as a function of the flow rate.
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Bitter Marcus
Onnen Marlin
Price David
Schlemmer Steffen
Deere & Company
Lopez F. Daniel
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