Expansible chamber devices – Abutment connection between working member and power...
Reexamination Certificate
1999-11-16
2001-08-28
Look, Edward K. (Department: 3745)
Expansible chamber devices
Abutment connection between working member and power...
C092S161000, C403S374400
Reexamination Certificate
active
06279453
ABSTRACT:
The invention relates to an apparatus for generating high pressure in a hydraulic fluid, in particular a cylinder/piston pressure device.
It is generally known (for example U.S. Pat. No. 2,727,466, U.S. Pat. No. 4,331,883, U.S. Pat. No. 5,494,414 and FR-A-614 342) that a pressure medium in a cylinder can be subjected to pressure to generate high pressure in pressure systems, eg for engineering processes or experimental purposes. The pressure piston is operated with a drive motor, by which the piston position in the pressure cylinder and thus the pressure in the hydraulic fluid can be set by suitable means for power transmission. In such a generic high-pressure apparatus, consisting of a drive unit and a high-pressure unit, the drive and high-pressure units must be firmly connected to guarantee safe and reproducible power transmission. The highest demands are made of the stability of the connection since in practical applications take-up of thrust must be ensured corresponding to values of 1 to 2 tonnes.
Because of the power transmission that is called for and for reasons of operating safety, conventional high-pressure apparatus is generally designed so that the drive and high-pressure units are firmly connected using elaborate technical means or constructed as an integral unit.
The interconnection of the components of conventional high-pressure apparatus is a disadvantage because operation of the high-pressure apparatus is restricted to a pressure range defined by the size of the particular pressure cylinder. If different pressure ranges, i.e. different active cylinder volumes, are required for a particular application, the corresponding number of high-pressure apparatuses has to be provided. Furthermore, operation of a high-pressure apparatus calls for regular maintenance of the high-pressure packings, especially the piston sealing. Disassembly of the high-pressure apparatus for maintenance purposes is impractical for the user. Because for maintenance the entire high-pressure apparatus has to be disassembled by a specialist costing time and money. These disadvantages mean that the range of use of conventional high-pressure apparatus is limited.
The object of the invention is to provide an improved high-pressure apparatus with which the disadvantages of conventional high-pressure apparatus can be overcome and that features, in particular, simplified handling, simplified maintenance and an extended range of use whilst guaranteeing high accuracy and reproducibility of the pressure setting.
This object is solved by a high-pressure apparatus with the features of patent claim
1
. Advantageous embodiments of the invention are defined in the dependent claims.
According to the invention the driving device and pressure generating device of a high-pressure apparatus are linked together by a frame configuration being formed so that both components are detachable and can easily be separated from one another in a pressure relieved state. The frame configuration is designed so that a fixed stop is formed in relation to a direction of power transmission (especially in the direction of thrust for pressure build-up) so that the driving device and pressure generating device are permanently positioned in relation to one another. The frame configuration is also designed so that the two components can be freely moved and separated in a direction other than that of transfer of force. The direction of power transmission and the separating direction preferably form an angle equal to or less than 90°. So the stop is formed of an essentially rectangular box or for the most U-shaped with one side open in the separating direction.
In a pressurized state the connection between the driving device and pressure generating device in the direction of power transmission is secured by the stop and in the separating direction by the friction influenced by the forces released in thrust. The driving and pressure generating devices are then clamped together in relation to the separating direction.
In a preferred embodiment of the invention the driving device is firmly (permanently) linked to the frame configuration, while the pressure generating device is detachably joined to the frame configuration. Thus the driving device forms a non-disassemblable unit to which the pressure generating device can be joined as needed by simple means.
REFERENCES:
patent: 2727466 (1955-12-01), Kling et al.
patent: 4331883 (1982-05-01), Vitaloni
patent: 5494414 (1996-02-01), Steinhart
patent: 5656034 (1997-08-01), Kochersperger
patent: 0751059 (1997-01-01), None
patent: 694342 (1930-12-01), None
patent: 2744175 (1997-08-01), None
patent: WO9502764 (1995-01-01), None
Baker & Botts LLP
Lazo Thomas E.
Look Edward K.
Resonic Instruments GmbH
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