Motors: expansible chamber type – With motive fluid valve – Controlled by rate of movement of working member
Reexamination Certificate
2006-05-09
2006-05-09
Lopez, F. Daniel (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Controlled by rate of movement of working member
C091SDIG001
Reexamination Certificate
active
07040215
ABSTRACT:
A control device for a working device (12) connected to a hydraulic circuit (10), especially for a load fork (16) which can be raised and lowered with a working cylinder (14) in a fork-lift truck. A valve control unit moves into an adjustment position when the load fork (16) is lowered even when carrying a load (18). A predefinable maximum volume flow is maintained in the hydraulic circuit (10). By providing the valve control unit with a pressure regulator (26) limiting a pilot control pressure for the control valve (28), once a predefinable regulating pressure differential is reached in the hydraulic circuit, the control valve moves into a regulating position to maintain the maximum volume flow. The known flow control valve is replaced in the main flow by a pressure regulator (26) disposed in the pilot control circuit (40), and only needs to be dimensioned for low volume flows. As a result, the control system can be constructed using simple, low-cost components which operate in a functionally reliable manner and enable stable control behavior.
REFERENCES:
patent: 3126031 (1964-03-01), Hayner
patent: 4250794 (1981-02-01), Haak et al.
patent: 3708143 (1988-09-01), None
patent: 4239321 (1994-05-01), None
patent: 0743460 (1996-11-01), None
Hydac Fluidtechnik GmbH
Lopez F. Daniel
Roylance Abrams Berdo & Goodman L.L.P.
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