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Publication numberUS445224 A
Publication typeGrant
Publication dateJan 27, 1891
Publication numberUS 445224 A, US 445224A, US-A-445224, US445224 A, US445224A
InventorsEdward M. Knight
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 445224 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.) 2 'S11eets-Sheet 1. E. M. KNIGHT.


No. 445,224. Patented Jan. 27,1891.

2 Sheets-Sheet 2.

(No Model) B. M. KNIGHT.


No. 445,224. Patented Jan. 27, 1891.

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' drawn from time to time.




SPECIFICATION forming part of Letters Patent No. 445,224, dated January 2'7, 1891.

Application filed July 1, 1890. Serial No. 857,394. (No model.)

T 0 coZZ whom it may concern:

Be it known that I, EDWARD M. KNIGHT, a c tizen of the United States, residing in the city and county of San Francisco, State of California, have invented an Improvement in Filters; and I hereby declare the following to be a full, clear, and exact description or the same.

My invention relates to certain improvements in filters of that class in which a fibrous or porous material is employed in conjunction with a filtering medium which may be replaced and renewed at pleasure.

It consists in certain details of construction, which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a vertical section of my filter. Fig. 2 shows a modified form of my device. Fig. 3 is a top view of the filtering-screen, showing the top screen and a portion of the asbestus broken away. Fig. 4 is a detail showing in cross-section a portion of the rim E, which clamps the edges of the screens and fibrous material together.

My present invention is designed to provide a portable filter in which the filteringsurfaces may be easily cleansed and renewed from time to time.

The supply and delivery chambers may be made in various forms; buta convenient arrangement which I have here shown is the employment of two chambers A and B. The chamber A forms a storage or delivery chamher having a cock and faucet at the bottom, from which the filtered water may be With- The chamber B has a flange at its lower end which fits into the top of the chamber A, so that the upper chamber is supported upon the rim of the lower one.

In the bottom of the chamber 13 is fixed the lower portion of the filter, which consists of wire screens C 0, having asbestus cloth or other fibrous materialD compressed between the two. Around the periphery of the wirecloth screens, which are cut to the proper size to fit into the bottom of the chamber B, is fixed a rim E of metal, which is flanged or bent over, so as to inclose the ends of the wire-cloth, and it is then soldered in place, so that the screens and the fibrous intermediate substance are firmly held in place and leakage of unfiltered water around the edges is prevented. In the present case I have shown the screens made of woven wire-cloth, and they may be set at any suitable angle with each other, so that the wires of one of the screens will cross those of the other diagonally; or, if preferred, they may be set so that the wires are parallel either directly in vertical line with each other; or the wires of one of the screens may stand intermediate with those of the other for the purpose of more completely subdividing the spaces and forming abet-tor support for the intermediate fibrous material. The two screens with the intermediate fibrous material and the surrounding ring are then fitted into the bottom of the chamber 13, where they may be soldered or otherwise permanently or removably fixed. The wire screen, which is above the fibrous material, forms interstices within which a paste formed of finely-pulverized charcoal is placed and is retained. In practice itis only necessary to mix the paste with water, and placing it in the chamber B it will settle to the bottom and fill the interstices in the wire screen, thus forming a coating which is supported by the fibrous material between the screens and which serves as filter and purifier for the water. In order to retain this paste in place and prevent its being washed out whenever water is introduced into the chamber I), I make a second frame consisting of the wire screens E E and the intermediate fibrous material F, with the surrounding flange or hoop G, whereby the whole device is held together. Upon the top of this is fixed a suitable handle II, by which it may be lifted. The diameter of this removable screen is such that it will easily fit into the chamber B and will rest upon the top of or above the filtering medium, which is spread upon the lower filter. This removable screen serves two purposes: first, when water is poured into the chamber B it prevents it from washing out the filtering medium, which is spread over the lower screen, and, secondly, it serves to receive any heavy sediment which may be in the water to be filtered and prevents its passing readily through upon the filtering medium below. The two chambers A and B being in place, the upper one is filled with water, whi ch grad u all y percolates through the screens and filtering medium, passing into the chamber below, from which it may be drawn from time to time, as desired. hem ever the upper and movable screen becomes clogged by sedimentary or other deposit from the water, it is only necessary to lift it out and rinse it in clean water, when it may be replaced. Vhen the filtering medium upon the lower screen has become clogged or contaminated, so that it is desirable to renew it, the chamber B is washed out with clear water and the paste washed off the upper surface of the screen, after which a new coating is placed upon the screen and the removable cover being replaced the filter is again in condition for work.

In Fig. 2 I have shown the delivery-chamber A made conical in shape, with a dischargepipe extending downward from the apex of the cone. The filter-screens are fixed just above this conical chamber, and the whole device may be attached to or connected with any suitable chamber or source of supply by which unfiltered water can be brought to and distributed over the filtering-surface.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a filter having a supply and delivery chamber, a fixed filtering-screen, and a removable filtering-screen, said fixed and removable screens each consisting of an upper and lower foraminous plate and an intermediate fibrous material and a flange or rim bent over the edges of the upper and lower plates and fibrous material and inclosing said edges to prevent leakage, substantially as herein described.

2. A filtering apparatus consisting of the supply and delivery chambers, a filter composed of wire screens having a fibrous material clamped between them and a surrounding ring or flange, whereby the parts are held together and leakage around the edges is prevented, a coating of filtering material spread upon the upper surface and in the interstices of the wire-cloth, and a removable screen or guard above the filter, substantially as herein described.

3. A filtering apparatus consisting of the supply and delivery chambers, the intern] ediate filter consisting of disks of wirecloth with an intermediate fibrous material compressed between them, a removable screen consisting of similar disks of Wire-cloth with intermediate fibrous material, and a rim or flange around the periphery of the disks, whereby the whole is clamped together, and a coating of filtering material in the form ot a paste spread upon the uppersurface of the lower screen or filter, substantially as herein described.

a. In a filter having a supply-chamber, a chamber below the same made conical inform and having a discharge-pipe leading therefrom, fixed and removable screens above the conical chamber, and each consisting of a fibrous materialcompressed between an upper and lower foraminous disk. and a clampingflange surrounding the edges of both disks and fibrous material, whereby leakage at said edges is prevented, substantially as herein described.

In witness whereof I have hereunto set my hand.



S. H. NoURsE, H. 0. LEE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3971305 *Mar 27, 1975Jul 27, 1976Daswick Alexander CDisposable beverage brewer
US5800707 *Jan 31, 1996Sep 1, 1998Robert Krups Gmbh & Co. KgWater filter
Cooperative ClassificationB01D23/02