Liquid purification or separation – With repair or assembling means – Hoist or handle means
Patent
1998-07-31
2000-01-04
Lithgow, Thomas M.
Liquid purification or separation
With repair or assembling means
Hoist or handle means
210767, 210806, 210136, 2104163, 210418, 210419, 210266, 210282, B01D 3526, B01D 3530, B01D 35153
Patent
active
060106263
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a portable, hand-operated small filter for purifying water.
Portable, hand-operated small filters are devices, which, because of their size and weight, can easily be taken along on journeys, hikes and marches. They usually have a housing volume of about one liter or less and a weight of less than approximately one to two kilogram, such that they can easily be transported far and be operated by a single person.
Known devices of this type comprise a filter with a pore size that is chosen such that physiologically dangerous bacteria are retained.
For operating the pump, a T-shaped grip is usually arranged on known devices, upon operation of which the water to be purified is pressed through the filter.
SUMMARY OF THE INVENTION
It is now an object of the present invention to provide an improved filter, which is as compact and small as possible, such that it can easily be taken along on journeys, marches, etc.
This object is met by the small filter having a grip which encloses at least a front side housing section of the pump.
Because the hand grip is cap-shaped and encloses, in its rest position, a part of the filter housing, a very compact design results. Still, the grip and seating surface, respectively, for the hand are comparatively large, such that the user does not tire during pumping and does not experience unpleasant pressure points.
An especially compact embodiment is achieved when the filter arrangement extends into the section of the housing that is enclosed by the grip, such that the available space is used optimally. A geometry where the filter arrangement surrounds the pump cylinder concentrically has been found to be especially expedient.
The filter arrangement can also comprise two filter stages arranged axially behind each other, wherein one filter stage is arranged in the front side (i.e. grip side) housing section and the second filter stage in the foot side (i.e. lying opposite to the grip) housing section. Depending on application, the water flow can be guided through one or both filter stages.
To simplify handling, grip and housing can be provided with gripping surfaces or grip ribs, respectively, such that the housing can be seized with one hand and the grip with the other.
In an embodiment that is especially convenient to operate, the suction inlet is arranged in a middle section of the housing and the outlet opening at the end of the foot side housing section (i.e. on the side opposite to the grip). In this way, the exit water jet can be controlled securely.
If the grip is provided with a convex front face, a large pressure can be generated during pumping with the ball of the thumb because the force is distributed homogeneously. Preferably, the grip is further provided with a nose extending transversely to the direction of movement and making it easier to pull the grip outwards.
Further applications, advantages and embodiments of the invention are given in the now following description of a preferred embodiment by reference to the figures.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a lateral view of a preferred embodiment of the invention,
FIG. 2 is a view of the device of FIG. 1.
FIG. 3 is a longitudinal sectional view of the device of FIG. 1, and
FIG. 4 a schematic block diagram of the water flow in the device of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The embodiment of the invention shown in FIGS. 1-3 is a compact small filter with a housing 1 and a grip 2. A filter arrangement with a ceramic filter 4 (FIG. 3) and a switch 5 is arranged in the housing 1, the method of operation of which is described below.
The activated charcoal filter 3 and the cylindrical ceramic filter 4 are arranged concentrically, each around a section of a pump cylinder 6, which extends along the longitudinal axis of the housing. A piston 7 runs in the pump cylinder 6 and is sealed against the cylinder wall with a piston ring 8. The piston 7 is connected to the grip 2 by means of a piston rod 9.
The grip 2 has substantially the sha
REFERENCES:
patent: 5019252 (1991-05-01), Kamei
patent: 5106500 (1992-04-01), Hembree
patent: 5569374 (1996-10-01), Williams
patent: 5709794 (1998-01-01), Emmons
Katadyn Produkte AG
Lithgow Thomas M.
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