Outside filter, in particular for aquarium

Details Outside filter, in particular for aquarium Outside filter, in particular for aquarium

1999-03-30

2001-02-13

Drodge, Joseph W. (Department: 1723)

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Discharge of treated material

C210S167150, C210S238000, C210S416200, C210S472000, C220S345100, C417S199200, C417S435000

Reexamination Certificate

active

06187179

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an outside filter, in particular for an aquarium.
In such outside filters, the motor operated pumps are not self-aspirating. The reason is that during certain conditions, for example when the pump is turned off, the water supply through the supply conduit to the pump chamber which accommodates the impeller of the pump is interrupted, and air is supplied in and then during subsequent turning on the pump can not transport water. Filter devices are known, which are provided with a device for producing a vacuum which operates when needed and therefore water can be aspirated in the air which is contained in the supply conduit with displacement. These devices are composed for example of a hand pump provided with a flexible bellows and various valves and conduits. The handling of such devices is partially very expensive and not practical.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an outside filter of the above mentioned general type in which the production of a vacuum is simplified and aspirational water in the supply conduit is provided.
In keeping with these objects and with others which will become apparent herein after, one feature of present invention resides, briefly stated, in an outside filter, in which a system which is composed of a housing inner chamber and a connected withdrawal conduit and communicating with a supply conduit is sealingly closed during the production of the vacuum from outside and operates from an evacuatable pressure chamber, and the device produces the vacuum inside this closed system.
When the outside filter is designed in accordance with the present invention, it avoids the disadvantages of the prior art and provides for the above mentioned highly advantageous results.
In accordance with another advantageous feature of the present invention, the device for production of a vacuum is formed of parts of the outside filter. This ensures an especially simple construction, since for production of a vacuum the parts of the outer filter are used and no additional elements are needed.
In accordance with a further embodiment of the present invention, the outside filter has an actuating device engaging the cover, with which the cover is openable with removal of the sealing condition preferably to a manual lifting and is movable outwardly of the housing, and is closeable in an opposite direction after placement with providing the sealing condition and movable in the housing as well as heldable in the closing position. With this design, the handling of the outside filter with regard to the releasing and the removing of the cover from the housing is substantially simplified.
In accordance with still a further advantageous feature of the present invention, the actuating device operates simultaneously for raising and/or at least insignificant inclination, for example tilting, of the cover for the production of the vacuum. Thereby the actuating device which operates for handling of a cover simultaneously in a simple manner is also operable for actuating the device for production of a vacuum formed of the parts of the outside filter, for example the cover is lifted relative to the housing and/or at least insignificantly inclined.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


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