Filter

Details Filter Filter

1999-12-03

2001-06-26

Savage, Matthew O. (Department: 1723)

Liquid purification or separation

With repair or assembling means

C210S440000, C210S454000

Reexamination Certificate

active

06251273

ABSTRACT:

The invention relates to a filter and a filter element.
Such filters and filter elements are disclosed, for example, in DE GM 296 16 834 in which a filter insert is shown whose ends are joined sealingly to end plates, wherein one or both end plates have an opening, in the marginal area of which an annular gasket is placed, which when the filter insert is in the installed state cooperates with a portion of the filter housing, and wherein at least one of the end plates is configured with a collar-like extraction handle which is spaced axially outward from the plane of the end plate and has an outside diameter smaller than the outside diameter of the end plate.
Also known from EP A1 0711 587 is a filter insert of this kind in which a collar-like elevation is likewise shown on one of the end faces of the filter insert, by means of which it is possible to remove the filter insert from the housing.
Furthermore, DE-OS 43 33 151 discloses a locking mechanism near the tip for a typewriter, in which three sleeve parts—a centering sleeve, a handle sleeve and an inner sleeve—are nested one inside the other, while a front pivot bearing is provided which resides between the handle sleeve and the centering sleeve, and forms a rotating latch and release mechanism between the rear end portion of the centering sleeve and the axially fixed and non-rotatable inner sleeve, the handle sleeve being axially displaceable on the outside of the inner sleeve.
If it is desired to use such filters or filter elements so that they are removable from the housing without coming in direct contact with the filter element, it is a disadvantage that the handle elements, which are collar-like, are attached directly to the filter element, so that direct contact with the filter element is unavoidable. An additional device could be provided which clutches the filter element tong-wise in the area of the collar-like shape. This has the disadvantage, however, that an additional cost-involving device must be created in order to avoid direct contact with the filter element.
The invention is thus addressed to the problem of improving a device of the kind described above so that a filter and filter element will result which makes it easier to install and remove a filter element that can still operate securely, without coming in direct contact with the filter element.
The problem is solved according to the invention by a filter which comprises a housing consisting of at least two housing parts, and a filter element fastened in the housing; at least one latch means is provided whereby a releasable latch fastening can be produced between the filter element and at least one of the housing parts. The advantage of such a solution is that a filter cartridge can be inserted into and removed from a filter housing in which the cartridge is fastened positively to a housing part without coming directly in contact with the cartridge which is possibly contaminated after use.
An advantageous embodiment of the invention provides that at least one latch means engages at least one corresponding opening and becomes hooked therein in the manner of a bayonet. This has the advantage that definite locations are created at which a detent, for example, can enter into a reliable and yet releasable connection.
In another advantageous embodiment, at least one latch means is disposed on the filter element. The latch means provided on the filter element resiliently engages in a corresponding recess on the housing in order to produce a releasable snap fastening.
Also, provision can be made according to the invention for at least one latch means to be provided on at least one housing part. As a reversal of the action, the placement of the latch means on the housing is also possible.
In an advantageous embodiment of the invention, at least one corresponding recess is provided on at least one housing part. These recesses provide the assurance that the engagement and disengagement will definitely take place, especially disengagement when the filter element is to be removed from the housing. In this case an axial movement of the filter element is provided for, whereby a conversion of the axial movement to a rotation brings the filter element inside of the recess to a position which makes it possible to bring the filter element out of the housing part contrary to the movement originally applied to the filter element.
In another advantageous embodiment, at least one corresponding recess is provided on the filter element. As a reversal of the action, the placement of the recess also on the filter element is possible.
Also according to the invention the recess can have a closing range, an opening range, a translation range, a retaining range and a release range. In this case the recess is configured such that an area is present which, after the filter element has been snapped into the housing part, provides so that the filter element is securely guided in the housing part by the cooperation of the latch element with the corresponding closing range of the recess until the housing is closed.


REFERENCES:
patent: 5538626 (1996-07-01), Baumann
patent: 5698097 (1997-12-01), Gebert et al.
patent: 5770065 (1998-06-01), Popoff et al.
patent: 9312856 (1993-10-01), None
patent: 19527844 (1997-07-01), None
patent: 319518 (1993-10-01), None

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