Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Fluid pressure responsive
Reexamination Certificate
1999-08-06
2001-04-17
Drodge, Joseph W. (Department: 1723)
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Fluid pressure responsive
C210S167150, C210S232000, C210S314000, C210S335000, C210S443000, C210S198100
Reexamination Certificate
active
06217754
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a swimming pool filter.
BACKGROUND OF THE INVENTION
For the cleaning of swimming pool water, several types of filters are already known which consist of casings having water inlet and outlet connections. The casings also include top covers and footing or bearing feet and receive sand fillings or a filtering cartridges.
The filter of the present invention provides a sensible improvement over prior art filters equipped with a filtering cartridge of a generally cylindrical shape forming an axial hollow core and being arranged in an upright position within the casing forming the filter body. The instant filter also provides an improvement over those filters comprising a cover provided to be secured by means of a ring nut apt to be fitted to the opening of the casing, the cover comprising fitting means for the fitting of a manometer and an outlet with plug for bleeding and/or draining purposes.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is one aspect of the present invention to arrange an accessory element in the axial hollow core of the filter cartridge. The accessory element complements the functions of the filter.
For example, the accessory element can be a heat exchanger for heating the water, a salt or chlorine cartridge for treating the water, or other accessories for various functions. Moreover, the accessory element can be an element for treating the water by means of ultraviolet rays.
In order to bring about this improvement, the instant filter is characterized in that it has an opening in a central location in its cover matching the hollow core of the filtering cartridge. The opening is closed with a plug which seals the opening and which is removably fitted to it. The opening forms an internal neck and the plug is fitted within the neck in a bayonet attachment, the fitting being carried out in a secure way. The neck includes anchoring elements and the plug includes lugs on its periphery, each anchoring element being for one of the respective lugs. The anchoring elements have particular shape comprising an incline along whose lower surface the corresponding lug slides into the anchoring element, and another incline along whose upper surface the lug slides out of the anchoring element. A lower recess is arranged between both inclines where the lug is held to thus secure the plug in its closing position, this being aided by the very internal pressure of the filter.
The instant improvements relate as well to the construction of the cartridge, the ring nut locking device, the fitting of the manometer and the construction of the bleeding outlet.
As for the construction of the cartridge, it is characterized in that it is formed by superimposed joinable modules thus allowing to obtain cartridges of different heights, the modules forming the cartridge's tubular core to which radial gills for filtration by means of diatomites can be attached by means of clips.
Regarding the ring nut locking device, its construction and arrangement is such that it can be operated with the same hand driving the ring nut when unscrewing it.
The manometer is fitted in a protected arrangement, for such a purpose being housed in a pocket provided in the cover; and the bleeding outlet has a construction that is such that it allows the bleeding and/or draining to take place without totally removing the plug plugging the outlet.
These and other characteristics will be best made apparent by the following detailed description whose understanding will be made easier by the accompanying seven sheets of drawings showing a practical embodiment cited only by way of an example which does not limit the scope of the present invention.
REFERENCES:
patent: 3899425 (1975-08-01), Lewis
patent: 4210624 (1980-07-01), Price
patent: 4780197 (1988-10-01), Schuman
patent: 5908553 (1999-06-01), Reid
patent: 6004458 (1999-12-01), Davidson
Aplister, S.A.
Drodge Joseph W.
Steinberg & Raskin, P.C.
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