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Publication numberUS447882 A
Publication typeGrant
Publication dateMar 10, 1891
Filing dateNov 22, 1890
Publication numberUS 447882 A, US 447882A, US-A-447882, US447882 A, US447882A
InventorsJohn H. King
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sand-strainer for deep wells
US 447882 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



No. 447,882. Patented Mar. 10,1891.

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SPECIFICATION forming part of Letters Patent No. 447,882, dated March 10, 1891.

Application filed November 22, 1890. Serial No. 372,285. (N model.)

To all whom, it may concern:

Be it known that 1, JOHN II. KING, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Sand-Strainers for Deep \Vells, of which the following is a specification. The object of my invention is to provide a cheap durable strainer for deep wells. In delo vices of this class the perforations are required to be very small and are ordinarily made with a milling-tool or fine circular saw. These tools cannot be made so light. that they will cut the slots fine enough from the outside I5 of the tube inward, nor can they be made light enough to make the proper-sized slots when the tool is used inside the tube, except when light soft yellow brass is used, and even in such cases the tool must be beveled back from the cutting-edge in order to give it strength. This makes a V-shaped slot, leavingbut a slight thickness of the soft metal at .the contracted openings of the slots, which are soon enlarged by the small particles of quicksand and the strainer rendered worthless.

By means of my invention I am enabled to make my strainer of any of the hard tough non-corrodible metals, such as aluminiumbronze, phosphor-bronze, gun-metal, &c., and can make the tubing much heavier than the soft tubing now used, and can make thewalls of the perforations parallel instead of V- shaped. 5 I will first describe my invention fully in connection with the accompanying drawings, and will particularly refer to and point out its novel features in the claims.

Referring to the drawings, in which like parts are indicated by similar reference-letters wherever they occur throughout the various views, Figure l is a central vertical section of a sand-strainer constructed according to my invention. Fig. 2 is a top plan view of 5 the same.

The strainer A is preferably formed of corrugated metal tubing. Over the top of this is fitted a brass collar B, theinterior of which conforms to the exterior of the strainer-tube, to which the collar is firmly united by solder and rivets a: 00, or in any approved manner.

Around this collar is stretched the customary elastic packing-ring O to form a water-301111; with the lower contracted end of the well-tube,

as shown in dotted line, Fig. 1.

In the bottom of the strainer is secured a disk D, the perimeter of which is corrugated to snugly fit into the tube A. This is secured in place by screws, rivets, or in any suitable manner. The upper side of this disk I) is 60. provided with the customary bail d, by which the strainer is grappled and drawn out when desired. The higher or projecting corrugations a of the tube A are transversely slotted, as shown, across their entire faces, leaving the lower parts or depressions a intact to support the ribs a formed by slotting.

My method of forming the slots or meshes of my strainer is to mount the tubeA'between centers and slowly revolve it against the blade of a band-saw running at a high speed.

I use a strong solution of soap and water as a lubricant and cooler. I am enabled to use a very thin saw-blade, as light as the one sixtyfourth part of an inch. By this method I perform the work of slotting the tube Very rapidly and make the meshes as fine as desired.

I do not confine myself to the exact form of corrugations shown,as the essence of my invention is in the means whereby the tube may be slotted from the exterior in the manner described and leaving unsevered vertical ribs to supportthe transverse ribs formed by the perforations. It is obvious that the form of corrugations may be changed without departing from the spirit and scope of my invention. It is also obvious that instead of employing the seamless tube I may form the part A or the whole strainer by casting.

I claim 1. The hereinbefore-described strainer for deep wells, consisting of the tube A, having its perimeter of varying diameters, the outer portions a of which are transversely slotted and the inner ones a left unsevered to support the ribs a which form the meshes of the strainer.

2. As a strainerfor deep wells, the corrugated metal tube A, having the alternate lon- I00 gitudinal convex ribs a and concave depressions a, the said ribs a being transversely slotted to form meshes for the strainer, substantially as shown and described.

I The method of forming strainers fordeep wells, Which consists in corrugating the cylinder, mounting the same between centers, and revolving the said corrugated cylinder against a traveling saw-blade and severing the outer or higher corrugations transversely to form meshes for the strainer, substantially as shown and described.


Witnesses GEO. J. MURRAY, R. W. DUGAN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4343358 *Feb 7, 1980Aug 10, 1982Uop Inc.Laser slotted plastic well screen
US4550778 *Jun 20, 1983Nov 5, 1985Certainteed CorporationWell screen
Cooperative ClassificationE21B43/086