Rotary kinetic fluid motors or pumps – With separating means or guard for solid matter in working...
Reexamination Certificate
1999-09-08
2001-01-30
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
With separating means or guard for solid matter in working...
C417S234000, C417S423600, C417S423900, C417S424100
Reexamination Certificate
active
06179558
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a filtering pump assembly. More particularly, the present invention relates to a portable pump assembly which includes a filter subassembly with a cage member for surrounding an inlet of a pump subassembly, and a replaceable filter element for covering the cage member.
2. Description of the Background Art
Many different types of portable pumps are known. For example, U.S. Pat. No. 4,741,664 to Olmstead et al. discloses a portable pump that is suitable for pumping a corrosive liquid out of a standard 55 gallon drum. In the pump design of Olmstead, an inner tube is positioned coaxially within an outer tube, and a driven shaft is disposed coaxially inside of the inner tube. The inner tube protects the shaft from being contacted by the liquid being pumped through the intermediate space between the inner and outer tubes. A motor sits atop the assembly for spinning the shaft, and the shaft has an impeller mounted on the lower end thereof.
Another portable pump design, similar to the design of Olmstead, is disclosed in U.S. Pat. No. 4,627,790 to Bowes et al.
Although the known portable pumps are useful for their intended purposes, a need still exists in the art for a pump having the ability to pre-filter the fluid being pumped therethrough to prevent entry of larger impurities thereinto. In particular, a need exists for a pump design in which a filter medium is removable and replaceable.
SUMMARY OF THE INVENTION
The present invention provides a filtering pump assembly, including a pump subassembly and a filter subassembly.
The pump subassembly has an inlet portion with a first cross-sectional shape. The preferred cross-sectional shape of the inlet portion is circular, since the preferred pump inlet shape is cylindrical.
The filter subassembly includes a foraminous cage member, having an opening formed therein of a shape corresponding to the first cross-sectional shape of the inlet portion, and configured to fit engagably thereon. The filter subassembly also includes a filter element formed of a porous material for placement in covering relation to the cage member. The preferred filter element is bag-shaped for placement covering and substantially surrounding the cage member.
Preferably, the filter assembly includes retaining means for retaining the filter element in covering relation to the cage member. The retainer may be an annular spring clip having two ends which overlap one another, and having a finger grip formed at each end thereof.
Accordingly, it is an object of the present invention to provide a filter assembly which is effective to both filter and pump a fluid material.
It is a further object of the present invention to provide a filtering pump assembly which includes a removable and replaceable filter element.
For a more complete understanding of the present invention, the reader is referred to the following detailed description section, which should be read in conjunction with the accompanying drawings. Throughout the following detailed description and in the drawings, like numbers refer to like parts.
REFERENCES:
patent: 2280626 (1942-04-01), Carpenter
patent: 2330336 (1943-09-01), Crites
patent: 2997957 (1961-08-01), Hall
patent: 4230440 (1980-10-01), Niedermeyer
patent: 4475872 (1984-10-01), Foughty
patent: 5202021 (1993-04-01), Griffin et al.
Eastman, III Robert
Pestrue Jeffrey Allan
Blackman William D.
Carrier Joseph P.
Carrier Blackman & Associates P.C.
Look Edward K.
McAleenan James M
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