Motors: expansible chamber type – With motive fluid valve – Inlet fluid supplemented by controlled fluid pressurized in...
Patent
1997-12-22
1999-06-01
Lopez, F. Daniel
Motors: expansible chamber type
With motive fluid valve
Inlet fluid supplemented by controlled fluid pressurized in...
91450, F15B 11024
Patent
active
059079916
ABSTRACT:
The present quick drop valve control provides both quick drop and float functions by moving a quick drop valve to a position interconnecting the drop and lift sides of a pair of lift cylinders when a directional control valve reaches a predefined position. The quick drop function valve is established by simultaneously energizing a first solenoid valve to communicate a shift end of the quick drop valve with a resolved pressure port of a resolver connected to the drop and lift sides and a first solenoid of a second solenoid valve to communicate a spring end of the quick drop valve with the drop sides so that the quick drop valve moves to the interconnecting position combining fluid expelled from the lift sides with fluid going to the drop side from a pump. The float function is established by simultaneously energizing the first solenoid valve to communicate the shift end of the quick drop valve with the resolved pressure port and a second solenoid of the second solenoid valve to communicate the spring end of the quick drop valve with the tank so that the quick drop valve moves to the interconnecting position effectively intercommunicating the pump, the tank and the lift sides and the drop sides of the lift cylinders.
REFERENCES:
patent: 4736673 (1988-04-01), Harada et al.
patent: 5226348 (1993-07-01), Dezelan et al.
patent: 5251705 (1993-10-01), Waggoner et al.
patent: 5370038 (1994-12-01), Poppe et al.
Connolly John R.
Harlow Randall A.
Ramamoorthy Chandrasekar
Seaney Steven P.
Caterpillar Inc.
Grant John W.
Lopez F. Daniel
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