Untitled record

Application filed May 14, 1883. (Xo model.)

To all whom it may concern:

Be it known that we, James T. A. Lewis and Charles A. Wolff, of Boston, in the county of Suffolk and State of Massachusetts, 5 have invented certain Improvements in Filters, of which the following is a specification.

This invention has for its .object to provide a cheap and serviceable filter adapted to be attached to an ordinary faucet.

io The invention consists in a filter composed of two separate members, forming a water way or passage, and their proximate surfaces being provided, respectively, with a bead and groove adapted to hold a disk of cloth or other £5 suitable filtering material, as we will now proceed to describe.

Of the accompanying drawings, forming a part of this specification, Figures 1 and 2 represent sectional views of two forms of filter 20 embodying our invention. Fig. 3 represents an enlarged section of a portion of the filter.

The same letters of reference indicate the same parts in all the figures.

Our improved filter is composed of two me25 tallic parts or members, a b, separably connected by means of internal and external screwthreads formed on said parts, as shown, and forming a passage for water. The part a has an internally-threaded neck adapted to be 30 connected to a faucet or water-pipe. The part b has an annular surface or seat, c, adapted to support a disk, e, of cloth or other suitable filtering material, aud provided with an annular groove, f. The lower end of the part a 35 clamps the filtering-disk e against the seat c when the two parts are connected, and is provided with an annular bead, g, coinciding with . the groove/and projecting into the same, as shown clearly in Fig. 3. It will be seen that 40 said bead and groove enable the parts a b to hold or clamp the edges of the filtering-disk much more firmly than would be the case if the proximate surfaces of the s'aid parts were plain or flat.

We have found by experience that a disk of flannel held in the manner described cannot be detached at its edges by any. water-pressure to which it can be subjected, and that the edges of the disk thus clamped constitute. a 50 packing which prevents leakage of water at the joint between the parts b a. ’ The bead and groove are concentric with the screw-threaded surfaces, whereby the parts a aud b are connected; hence the rotation of one part in screwing it onto the other to insure the clamping- 55 pressure on the filtering-disk does not displace said disk nor disturb its relation to the parts ά b. We prefer in some cases to provide the part b below the disk e with an inwardly-projecting flange, V, tosupportastraiu- 60 er, i, of wire-gauze, as shown iu Fig. 1. We do not limit ourselves to this construction, however, as the part b may terminate in a nozzle, as shown in Fig. 2.

It will be seen that by the described con- 65 struction the filtering-disk can be very easily applied and removed, so that the filter can be kept in good condition at a very slight expense.

We are aware that a filter composed of two 70 parts screwed together aud adapted to clamp a filtering-disk between their proximate surfaces is not new, and we do not therefore claim such construction, excepting when said surfaces are formed with the bead and groove. 75