Motors: expansible chamber type – With motive fluid valve – Valved piston
Reexamination Certificate
1999-04-28
2001-04-24
Ryznic, John E. (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Valved piston
C060S402000
Reexamination Certificate
active
06220142
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an operation actuation device for a hydraulically controlled actuator, especially for its emergency operation. A housing incorporates a fluid container which can be connected through one connection point to the actuator and through another connection point to a hydraulic supply circuit of the actuator. A separating piston is guided longitudinally slidably within the fluid container by a manually operable adjusting device. The piston includes a control device controlling a through-flow opening connecting the connection points with one another.
BACKGROUND OF THE INVENTION
When a breakdown or disruption of the hydraulically controlled actuator, generally in the form of a hydraulically operable working cylinder, occurs, for example as a result of current interruption, the actuator can usually no longer be operated. Those occurrences can lead to dangerous disturbances, especially in areas relevant to technical security and/or safety, such as in nuclear power plants or the like. Conventionally, in such operation emergency situations, separate and independent emergency operation systems are activated. However, these emergency operation systems are costly to manufacture and set up, and generally are located so far removed from the site of disturbance that the emergency operation cannot be directly monitored by the operator.
DE 33 44 132 C2 discloses an operation device for a hydraulically controlled actuator which has a housing incorporating a fluid container connected through one connection point to the actuator and through another connection point to a supply circuit. Within the fluid container, a separating piston is guided longitudinally slidably by a manually operable adjusting device in the form of a pump handle. The pump handle cooperates with a mechanically working control device working separately in the form of a sliding piston to generate a through-flow opening connecting the fluid connection points with one another.
When this known arrangement is provided for emergency actuation of the hydraulically controlled actuator, no conclusions can be derived from the setting of the pump handle regarding whether an operationally secure and/or safe emergency operation has taken place or not. The known control device in the form of the longitudinally movable sliding piston is controlled exclusively by the fluid pressure, leading to erroneous control of the known control device and independent of the setting of the separating piston controlled by the pump handle. Additionally, because of the plurality of parts in the known solution, it is costly to manufacture.
SUMMARY OF THE INVENTION
Objects of the present invention are to provide an operation actuation device providing, in disruptive situations, a simple and low-cost system for controlling the hydraulically controlled actuator that is operationally secure and safe and that can be monitored from the outside.
The foregoing objects are basically obtained by an operation actuation device for emergency actuation of a hydraulically controlled actuator, comprising a housing having a fluid container with an actuator connection point and a hydraulic circuit connection point. A separating piston is guided for longitudinal sliding movement in the housing between first and second end settings. A manually operable adjusting setscrew is coupled to and controls movements of the piston in the housing. The setscrew is threadedly engaged with the housing and is axially movable relative to the housing to move the piston between the end positions. A through-flow opening in the piston is controlled by a control check valve therein and provides controlled fluid communication between the connection points. The check valve is opened in the first end setting by engagement with a part of the housing and is closed in the second end setting by being spaced from the part of the housing.
Since the adjusting device is a setscrew which can be screwed into and out of the housing, the setscrew screwing-in length is determined so that the separating piston cooperating with it can be moved between two end settings. The check valve, operated in the end settings by the separating piston, is mechanically controlled in a pro-active manner, and thus, is operationally secure. The separating piston, through a single, non-repetitive delivery movement of the setscrew, specifically assumes the relevant end setting. Consequently, a mechanically specific coupling between setscrew, separating piston and check valve is generated. Such coupling is exceptionally operationally secure and safe, and consequently, is especially suitable for emergency operation of the actuator.
The position of the setscrew, screwed fully in or out, allows the on-site operator an immediate overview of whether or not an effective emergency operation system for the actuator exists.
The operation actuation device according to the present invention includes only a few structural parts and consequently can be realized simply and at low cost. Using the manually operable adjusting device, the setting process and consequently the operation of the controlled actuator can be monitored precisely on site by the operator. Erroneous control actions are avoided. With sufficient oil volume stored in the fluid container, external readiness setting of control fluid is not necessary. Fluid control by means of the operation actuation device occurs without leakage, so that an operationally secure and/or safe manual emergency operation is guaranteed.
Other objects, advantages and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the present invention.
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patent: 745289 (1943-12-01), None
patent: 3344132 (1984-06-01), None
patent: 1392507 (1965-06-01), None
patent: 911340 (1962-11-01), None
Flutec Fluidtechnische Gerate GmbH
Roylance Abrams Berdo & Goodman L.L.P.
Ryznic John E.
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