US734890A - Filter. - Google Patents

Description

110.734.890, 1: PATENTED JULY 28, 1903. E. M. KNIGHT.

,No MODEL.

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` @www t UNITED STATES Patented Juy es, leo.

DWARD'MARTIN KNIGHT, or BROQKLYN, NEW YoRK, AssIGNoR or oNE- HALFToRL H. MARTIN, or NEW YORK, N. Y.

FILTR.

SECIFICATION forming part of Letters Patent No. 734,890, dated July 28, 1903. l Application filed April 16, l903. Serial No. 152,954. (No model.)

To all whom t may concern/.-

Be it, known that I, EDWARD `MARTIN KNIGHT, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented'new and useful Improvements in Filters, of which the `following is a specication. f

This" invention relates to lters generally,

and particularly to that class designed for 1o ltering water for domestic purposes and employing a filter-bed `composed of fibers of as,

Y bestos, compressed to form a pad or diaphragm, which is the medium for removing the sedimentary or suspended matter from t5 Jthe water; and the invention consists of the parts andthe constructions and combinations `of parts which I will hereinafter describe and claim.

Referring to the accompanying drawings,

:zowhich form a part of this specification, in`

which similarcharacters of reference indicate like parts throughout the several views, Figure l represents a sectional perspective View of a lter embodying my invention. Figs. 2` y z5 and 3 are sectional views of other type of fil-` ters, showing the salient features of. my inf vention. Figs. 4 and 5 are plan views of the filter ofFigs. 2 and 3 with the exteriorcaps removed. Fig. 6 is an enlarged detail to be 3o referred to.

In carrying out my invention I preferto form the filter so that it shall have the general shape of a relatively shallow disk, although I do not limit it to this specific shape.

`The filter consists of, say, five essential parts-namely, a flanged base portion A; a foraminous cap B, fitting said base; a fibrous pad or diaphragm C, iixed to or over the cap a ring D of larger diameter than the cap and 4o tting around the same and Aserving as a setter for the filtering-pad or diaphragm, and an exterior cap E, having a surrounding rim or iiange which incloses the cap, ring, and pad and `fits over the outside of the iianged body portion.

Referring to Fig. l, it will be seen that the base portion A is of a circular form and is spun,stamped, or otherwise shaped to provide a circumferential groove a, bounded on 5o one side by a circumscribing flange a and on the other side by a'wall a". This wall is formed by upturning the edge of the baseplate to form a :flange a3, and said edge is thence folded over or returned upon itself to form an exterior wall a4, at the base of which is formed a bead a5. This form results from spinning or forming a relatively deep groove a6 in the bottom of the plate. The bottom of the plate, which may be slightly concaved, is pierced to receive an outlet-pipe l0, to which 6o may be attached a flexible tube for drawing `ed, filtered water into a vessel or tank. B v way of illustration I show by dotted lines in Fig. l two superposed buckets B11 B12, one of which (the upper) receives the water tobe ltered, 65

While the other (the lower) serves as a receiver for filtered water. In the bottom of the upper bucket is made a hole to receive the outletpipe l0 of the base-plate of the filter, which pipeinvthis'instance is threaded and is en- 7o gaged by a suitable nut l2 and washer, where- `bythe filter isheld in position. The buckets may `of course be of any well-known and Aappropriate character and are made of any suitable and desired material, and theymay represent any'form of vesselsfor containing unfiltered and filtered water, respectively.

5 Over the inner flange a', which rises from the ibase-plate and forms the inner Wall of the groove or channel a, is closely iitted the an- 8o nular flange c of the inner or foraminous cap y B, and over the cap is placed a pad or dia- ;phragm C,of asbestos orother material, which is preferably formed between dies and has a soft flexible edge and a compressed central portion, as described more in detail in a former application iiled by me March 4, i903, Serial No. 146,123. This pad or diaphragm has a diameter inexcessof thatof the foralninous cap C, so that its surrounding edgepro- 9e jects sufciently to allow it to be pressed into and'substantially ill the groove or channel d, formed in the inner face of the base-plate A.

In the present instance when the pad Uor diaphragm is placed upon the inner for-amil nous cap Bit is set and secured in position by means of asubstantially Wide ring D, which has a diameter slightly greater than that of the cap B, whereby upon being placed in position upon the cap and the superposed loo pad C the lower edge of the ring, which is preferably beaded, as at l5, forces the soft edge of the pad or diaphragm inward into the groove or channel a, and the surrounding flange of the ring circumferentially and tightly compresses the edge of the pad against the surrounding ange of the foraminous cap B, thereby makingajoint thatis proof against the leakage of unfiltered Water, and to assist in obtaining this important result the free edge of the pad, which is turned up and exposed between the outer wall of the ring and the inner wall of the outer flange of the baseplate, may be tamped or otherwise compacted into the space therebetween. It will be observed that the ring is but substantially a band encircling and tightly compressing that portion of the pad between said band and the inner ange a of the base-plate and between the lower edge of the band and the bottom of the groove or channel. It serves also, and primarily, to set the fibrous pad, and the ring being open all of the central and active portion of the pad is exposed, and the person applying the pad can see what he is doing, and if the pad should be upturned by setting it inposition this defect would be noticeable and proper attention given to it before the filter is pnt into operation.

To com plete the filter, I employ the exterior cover E, whose surrounding flange e tits closely over the exterior of the flange awhich surrounds the outer edge of' the base-plate, and thus covers and protects and conceals the otherwise exposed edge of the fibrous pad. The exterior cover has sufficient height above the pad to form achamber, and the unfiltered water enters this chamber through perforations 1G, formed in the cover at a suitable point, say,in the surrounding flange, as shown in Fig. 1.

The exterior cap or cover E has a handle Fl to facilitate its removal and replacement, and through this handle is made a vent 17 for admission of air.

In operation the filter is placed in position in a vessel, and the water to be filtered is placed in the vessel and will pass into the chamber of the filter and thence percolate through the pad or filter-bed, giving up its impurities, and finally passing out of the discharge-tube and into a vessel placed to receive the filtered Water.

In Fig. 2 I illustrate the present improvement in connection with a suction-filter of slightly-modified form designed to be iixedin an upright position vin a vessel for lateral filtration through opposite sides. This filterincludesa central member A', of suitable material, having a centrally-located inwardlyopening circumferential groove amanti an inner chamber C415, said groove having leading from it atnbe 18,through which ltered water may be drawn, while au air-Valve at 19 is provided to admit air, and thus prevent the filter becoming air-bound.

. On opposite sides of the central member of the filter is formed an annular groove or channel-uff", corresponding to the one shown in Fig. 1 and bounded by inner and outer flanges a7 a8. Over the inner end of these flanges is placed a close-fitting foraminous cap B3, upon which the pad of fibrous material C is placed, as described for Fig. 1,

and over this pad is placed a setter ring or.

The suction-filter of' Fig. 2 is designed to have an exterior cap or cover E', which lits over the outer flange aS of the central member A', as described for the exterior cover of Fig. l, and said cover E may be provided with an interior chamber a9, with openings 20' for the admission of unfiltered water, or the cover may be an imperforate one to be removed from the lter when the filter is in use, and thus expose the pad to the direct action of' the water, as shown in Fig. 4.

In Fig. 3 I show a suction-filter of' thin disklike form designed to be carried in the pocket and useful for tourists, sportsmen,the naval andmilitary establishments, dto. In all its essentials it is like Figs. 1 and 2 in that it has a circular disk forming abase-plate A3, with the inner and outer Iianges al@ all. Over the inner ange ctw is closely fitted the foraminous cap B2, and over this is placed the pad or diaphragm C2. A ring D2 is placed over and upon the pad and tightly and circumferent-ially compresses the edge of the pad betweenv its surrounding flange and theinner iiange am of the base-plate, as described for the other forms, and an exterior cover F.2 is used and made either perforate or imperforate, as described for the same cover of Figs. 1 and 2, said cover fitting over the outer ange @20E the base-plate. If the cover used is of the imperforate type, it is removed from the filter when the filter is in actual use to give free and direct access of the Water to the brous pad, whose exposed surface is protected by rods extending across the upper part of the setter-ring, as shown and as before described.

The pocket-filter has a valved air-vent 22 leading to its interior chamber, and a suctiontube 23 leads from the discharge end of this chamber.

Each or any of the preceding forms of base plates or members may have and preferably has the lower portion or base formed of its outer circumscribing iiange undercut, as at H, and connecting with the bottom of the annular groove which receives the setter-ring, as shown in Fig. 6, and the bottom edge of the setter-ring may be and preferably is formed with a projecting lip I, which coacts ICO with said undercut portion to form a secure lock for'the edgeportion of the fibrous disk, for when the ring is forced into place its flange turns the edge of the pad into the groove and the projecting lip I crowds a part of the edge ofthe pad into the said undercut portion of the outer flange of the base and forms a secure lock for the pad and prevents its slipping out of proper position.

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

1. In a filter, the combination of an annularlychanneled base member having a lil- `tered-water outlet; a foraminous cap supported upon the base member; a pad supported upon the cap; and having such diameter that it normally extends over the annular channel of the base member; a ring fitted over the cap and pad and engaging the portion of the pad overlying the annular 'chant nel of the base member and compressing the pad; and an exterior ca edge portion into the annular channel and against the bottom thereof, and exposing the p fitting the outside of the base member.

2. 4In a filter; the combination of an annularly-channeled base member having a filtered-Water outlet,andhavinginnerand outer concentric flanges forming the walls of the channel; a foraminous cap closely fitting the inner flange; a filtering medium placed upon said cap and having a greater diameter than the cap whereby its edge normally projects beyond the same and over the annular channel of the base member; a ring of slightlygreater diameter than the cap and fitting over the filtering medium and depressing the projecting edge portion thereof into the channel of the base member and against the bottom thereof, and circumferentially compressing the material against the standing wall of theinner flange to form a tight joint, said ring open at the center to expose the central portion of the filtering material.

3. In a filter, the combination of an annularly-channeled base member having a filtered-water outlet,and having inner and outer concentric flanges forming the walls of said channel; a foraminous cap closely fitting the inner ange; a pad of fibrous filtering material placed over the cap said pad of greater diameter than the cap whereby its edge projects beyond the same and over the annular channel of the base member when the padis placed in position; a ring of greater diameter than the cap and having its lower edge to engage the projecting edge of the pad and force the same into contact with the bottom of the channel of the base member, thereby setting the pad, said pad having its central portion exposed through said setterring and said ring circumferentially compressing the turned portion of the pad against the wall of the channel formed by the said inner flange; and a cover or exterior cap having a circumferential flange to pass over the outside of the outer flange of the base member.

4. In a filter, the combination of an annularlychanneled base member having a filtered-water outlet and inner and outer concentric flanges forming the walls of said channel; a foraminous cap fitting closely the inner flange; a pad of fibrous material over said cap and an open center ring for setting the pad in place said ring having its surrounding flange circumferentially compressing the pad against said inner flange and having its lower edge pressing an extended edge portion of the pad into said channel; and au exterior cap inclosing the pad and ring and having its surrounding flange extending over the outside of the exterior flange of the base member, said exterior cap having holes forming inlets for unfiltered water.

5. In a lter,the combination ofa base member having concentric flangesforming a groove or channel between them; a foraminous cap seated against one of said flanges; a pad of fibrous material over said cap; and a ring for setting the pad; said ring having a surrounding flange to compress the pad circumferentially against the inner wall of the channel and said channel undercut in the opposite wall' to permit the ring to force the fibrous material therein and form a lock for the pad.

6; In a lter the combination of a base member havingconcentricflangesformingagroove or channel between them; a foraminous cap fitting said inner flange; a pad of fibrous maferial over said cap; a ring for setting the pad and having its surrounding flange to compress the pad circumferentially against the inner flange and having its. bottom edge to force the edge of the pad into the channel between the flanges said ring having a projecting toe-piece surrounding its lower edge.

7. In a filter, the combination of an annularly-channeled base member; a foraminous inner cap; a pad of brous material thereover andlying within said channel; said channel undercut at one side; and a ring for setting the pad said ring circumferentially compressing the pad and having a projecting toe surrounding its lower edge and adapted to force the pad materially into the undercut portion of the channel to make a lock-joint.

In testimony whereof I have hereunto set my hand-in presence of two subscribing wit-Y nesses.

EDWARD MARTIN KNIGHT'. Witnesses:

H. D. JAMESON, F. L. RAND.

IOO

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