Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Separate valve means actuatable by a common nonmanual...
Patent
1995-07-20
1997-09-30
Nguyen, Hoang
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Separate valve means actuatable by a common nonmanual...
F15B 1100
Patent
active
056716516
ABSTRACT:
In a servohydraulic actuator comprising a valve housing, a tandem cylinder, first and second servo valves operating synchronously and in axial alignment with one another in the valve housing and hydraulically connected to the tandem cylinder. Each of the first and second servo valves include an outer sleeve provided with inlet and outlet ducts and a control slide wherein one of the first and second servo valves are displaceable and the other servo valve is stationary. The displaceable valve includes a device for applying a resetting force acting against displacement of the valve. An intermediate sleeve separates the first and second servo valves and includes a coupling rod having an enlarged portion with a transverse opening which extends between and connects the control slides of the first and second servo valves. The actuator also includes an adjustment device for applying an externally controlled axial force against the resetting force to displace the outer sleeve of the displaceable servo valve.
REFERENCES:
patent: 2836196 (1958-05-01), Gunn
patent: 3333413 (1967-08-01), Mercier et al.
patent: 3486418 (1969-12-01), Cryder et al.
patent: 4884401 (1989-12-01), Metcalf et al.
Mannesmann Aktiengesellschaft
Nguyen Hoang
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