US2572173A

US2572173A - Strainer

Info

Publication number: US2572173A
Application number: US717275A
Authority: US
Inventors: Mcfarlin Kirk
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-12-19
Filing date: 1946-12-19
Publication date: 1951-10-23
Anticipated expiration: 1968-10-23

Description

K. M FARLIN Oct. 23, 1951 STRAINER 2 SHEETS'SHEET 1 Filed Dec. 19, 1946 EU DEED DDUDUUD FIG. 2'

R .m f T NH E VC mM k .W K

K M FARLIN STRAINER 2 SHEETS-SHEET 2 Filed Dec. 19, 1946 FIG. 5

FIG. 7

INVENTOR Kirk Mc Forlin BY [A ATTORN EY Patented Oct. 23, 1951 UNITED STATES PATENT OFFICE 7 Claims.

This invention relates to improvements in strainers, and more particularly to strainers for water pumps adapted to prevent sticks and other foreign bodies from entering the inlets of pumps and impairing the operation thereof.

An important object of the invention is to provide an efficient strainer for a water pump, of simple and inexpensive construction, with a reticulated wall through which the water flows on its way to the intake pipe of the pump, and having special structural features by which foreign bodies are arrested on the exterior of the strainer, and clogging of the openings to the interior is averted.

Another object of the invention is to provide a. strainer of the type mentioned designed for ready and quick assembly to make a finished durable unit capable of long and satisfactory service.

These and additional objects and advantages of the invention are fully described herein and the novel features of my improved strainer are defined in the appended claims. But this disclosure is explanatory only, and I do not wish to be limited to the exact form illustrated and set forth. In practice many changes in details may be adopted without discarding any of the essential characteristics of the device.

In the drawings:

Figure 1 is a top plan view of my improved container.

Figure 2 is a horizontal cross-sectional view of same.

Figures 3 and 4 present details thereof.

Figure 5 is a top view of a modification. Figure 6 is a side view; and

Figure 7 is ,a cross section thereof.

The strainer is illustrated as comprising a body with a bottom 2 and a top 3. In generalthe shape is cylindrical or round, though of course it can be produced in other forms without material alteration in either design or operation. Between the

ends

2 and 3 the body is reticular, with openings 4 that are square or of any other desired outline. The top 3 has a central opening 5 by which the strainer can be coupled to the inat the inner end; and bears internal screw threads 9. This shape facilitates the connection of, the pump conduit with the strainer, because the conduit, which is of somewhat less outside thickness than the inside diameter of the neck 6 can be easily inserted into the latter and then guided by the contracting inside surface of the neck 6 into engagement with the threads 9 to make a tight union therewith. The neck 6 is surrounded by a baffie member Ill, which is concentric withthe neck and extends beyond the inner end thereof to a point which is a predetermined distance from the bottom 2. This sleeve I0 is also secured by welding or in any other suitable way to the inside face of the top 3. The water enters by way of the openings 4 and flows past the edge of the sleeve 16, and is drawn out through the neck 6.

The shoulder I enables the top 3 to be quickly and eifectively affixed to the neck, and then the baffle sleeve I0 can be readily put into place around the neck and secured to the top 3. The top with the neck and sleeve can then easily be united as by welding to the body I and the bottom 2 is then afiixed to the body in the same way, or theparts can .be assembled in any other order that is convenient.

The bottom 2 projects beyond the body, as shown at ll, around its entire periphery, and the top 3 also projects in the same manner as shown at l2. The extension of the edges of the bottom keeps twigs, sticks and other objects from being drawn into direct contact with the strainer between the top and bottom to such a degree as to clog the openings 4 and obstruct the flow of water therethrough. A large stick, for example, is apt to be engaged by both edges, or even if it is impelled against one edge only and strikes against the reticulated body at one end, the same effect will still be obtained, though somewhat reduced, because for the greater part of the length of the stick or twig a material space will be left between it and the outside of the strainer. If a number of twigs are collected in this way at the strainer, they will form at most a mass with numerous interstices and passages through it, and the flow of water will not be materially diminished. Without the extended edges II and I2, the refuse in the water could come into direct contact with the body, and before long the strainer would become so choked that operation could not be continued without stopping the pump and removing the aggregated material. The effect due to the edges II and I2 is quite marked, and the advantage and benefit which these edges give in practice have been demonstrated over long periods of actual service under all conditions which are encountered with pumps.

The shoulder joint between the end 3 and the neck 6 is tight and leak-proof and the general design, including the shape and method of assembling the various parts, imparts to the device great strength and durability, enabling it to withstand rough treatment under severe conditions of use.

In Figures 5, 6 and 7 the construction is very similar except that the ends 2 and 3' are cut away at one part of the rim to provide straight edges l3. The reticulated body 4 terminates adjacent the ends of these straight edges and between the opposite ends of said member 4 the ends 2 and 3' are joined by a fiat plate I4 also secured in place by welding and having a central opening 5' for the neck 6. The neck has the same shape as before projecting inside of the strainer and connected to the edges of the aperture 5 by the same kind of shouldered joint. This modification also includes a baffle plate l which is welded to the top plate or end 3' as before and terminates short of the opposite end 2. This plate is curved, away from the neck 6 over the greater part of its extent and its two ends are bent towards the plate l4 and welded thereto along the edges.

This form of strainer is, of course, connected to the suction pipe leading to the pump at the side where the opening and neck 9 are located.

At the center the ends 2' and 3' may be joined by a tube 16 open throughout and having its ends secured by welding to the end plates 2' and 3'. This tube adds to the strength of the construction and to some extent facilitates handling.

For example, a rope or cord might be passed through this tube l6 after the pump pipe has been joined to the neck 6, if the pipe and the strainer have to be lowered or moved about after immersing into the pool to be drained.

From the foregoing description, the nature of my invention is now clear, and the construction set forth is well calculated to afford all of the advantages and objects which should be obtained with a strainer of this type.

Having described my invention, what I believe to be new is:

l. A strainer comprising end plates and a body with a reticulated wall joined to said end plates along its opposite edges, said end plates being extended beyond said wall to obstruct contact of floating bodies therewith, one of said end plates having an outlet opening, a neck afiixed to the last-named plate at the inner edge of said opening and a balile element attached to the inner face of said last-named end plate surrounding said opening and said neck, and terminating short of the other end plate.

2. A strainer comprising end plates and a body having a reticulated wall joined to said end plates along its opposite edges, one of said end plates having an outlet opening, a coupling neck with an external shoulder engaged by the lastnamed plate at the inner edge of the opening and secured thereto, said neck having a contracting inner surface with inside threads for con venient engagement with an intake conduit for a pump, and a baflle element affixed to the inside face of said last-named end plate concentric with the neck and extending beyond the inner end thereof and terminating short of the opposite end plate.

3. A strainer having a body with a reticulated wall and end plates joined to the wall along its opposite edges, said end plates being extended beyond the outer face of the wall to obstruct contact of floating bodies therewith, one of said end plates having an outlet opening, a coupling neck inside said strainer, said neck having an external shoulder which fits into the last-named plate at said outlet opening and is secured thereto, a baflie sleeve affixed to the inside face of said last-named end plate and concentric with said neck, said element extending inward beyond the neck and terminating short of the opposite end plate, the neck having a contracting inner surface and inside threads for convenient coupling to the intake of a water pump.

4. A strainer comprising end plates and a body with a reticulated wall joined to said end plates along its opposite edges, said ends being extended beyond said wall to obstruct contact with fioating bodies therewith, the strainer having an outlet opening, a neck aflixed to the body at the inner edge of said opening and a baffle element attached to the inner face of one of said end plates adjacent said neck and terminating short of the other end plate.

5. A strainer comprising end plates and a body with a reticulated wall connecting said end plates along its opposite edges, said end plates being extended beyond said wall, the reticulated wall having separated ends, a plate joined to said separated end plates and to the ends of the body, said plate having an opening, a neck attached to the edge of the opening and projecting into the strainer and a bafiie element attached to the inner face of one of the end plates of the strainer in front of said neck, the ends of said element being bent towards said plate and secured thereto.

6. A strainer according to claim 5 wherein said neck contracts within said strainer and has inside threads on said contracting surface.

7. A strainer comprising end plates and a body with a reticulated wall joined to said end plates along its opposite edges, the strainer having an outlet opening, a bafiie plate attached to the inner face of one of said end plates adjacent said opening and terminating short of the other end plate, and a neck attached to the firstnamed plate at the inner edge of said opening and extending into the body, said neck contracting towards the inner end and bearing internal threads adjacent the narrowest part thereof.

KIRK MCFARLIN.

REFERENCES CITED The following references are of record in the file of this patent: I

UNITED STATES PATENTS Number Name Date 228,986 Crocker June 22, 1880 1,326,385 Bartlett Dec. 30, 1919 1,694,743 Hinman Dec. 11, 1928 1,722,626 Dean July 30, 1929 1,836,269 McKenzie Dec. 15, 1931 1,945,824 Saxe Feb. 6, 1934 2,100,165 Holmiberg et al. Nov. 23, 193'? FOREIGN PATENTS Number Country Date 289,643 Germany Jan. 12, 1906