Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2840828 A
Publication typeGrant
Publication dateJul 1, 1958
Filing dateApr 9, 1957
Priority dateApr 9, 1957
Publication numberUS 2840828 A, US 2840828A, US-A-2840828, US2840828 A, US2840828A
InventorsWilmer Furnberg Carl
Original AssigneeWilmer Furnberg Carl
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Means of inflating by air separated from combined air and water pressure
US 2840828 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)



MEANS OF INFLATING BY AIR SEPARATED FROM COMBINED AIR AND WATER PRES- SURE Carl Wilmer Furnberg, Portland, Oreg. Application April 9, 1957, Serial No. 651,751

1 Claim. (Cl. 4-172) This invention relates to a device for simultaneously delivering water and air under pressure to points of use by directing water only under pressure to the device.

The device is readily adaptable to many uses, one of Which, for example, is for inflating the tube or tubes of an inflatable swimming pool while at the same time filling the pool with water.

One of the principal objects of the invention is the provision of a device of this character which is of simple, eflicient, durable and inexpensive construction, entirely automatic in operation, readily installable and positive in delivering desired or predetermined amounts of air and water for a given purpose.

The foregoing and other objects which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side View of the invention operatively applied to an inflatable swimming pool (shown in broken lines) for inflating the tubes thereof while at the same time filling the pool with water. Fragments of the device have been broken away for convenience of illustration.

Figure 2 is a detail view on an enlarged scale of an air hose connection having a restricted flow opening therein; i

Figure 3 is a .detail view on an enlarged scale of-a Venturi tube with a fragment broken away.

Figure 4 is a sectional top plan view taken along the line 4-4 of Figure 1.

Figure 5 is a fragmentary side view of an inflatable swimming pool showing a modified form of the invention applied thereto.

With continuing reference to the drawing and particularly to Figure 1 thereof, reference numeral 1 indicates a separation tank, preferably of molded plastic or the like, closed at both of its ends and supported within a base 2 flanged upwardly as at 3. Extending upwardly from the center of the bottom wall 4 of the tank and terminating approximately midway between the top and bottom thereof is a baflle plate 5 which divides the bottom half of the tank into two chambers 6 and 7 which for convenience will hereinafter be referred to respectively as water and air intake chamber and water outlet chamber.

Secured to or molded integral with the vertical wall of the tank 1 isa water conduit in the form of a standpipe 8 enclosed at its bottom end within the flanged base 2 and in open communication as at 9 with the interior of the water outlet chamber 7. The top end of the standpipe is extended horizontally as at 10 to any desired length where it terminates in a spout 11 adapted to overhang the top wall or top tube of a swimming pool made up of a plurality of inflatable tubes 12, 13 and 14 or any desired number, more or less, superimnited States Patent 0 T" to a suitable valve 19, such as a tire valve or the like,

secured to the bottom tube 12 and in communication with the interior thereof.

A Venturi tube generally indicated at 20 (see also Figure 3) provided with a flange 21 is secured thereby to the flanged base 2, extends therethrough and through the wall of the tank 1 into open communication with the interior of the tank. The opposite end of the Venturi tube is provided with a conventional coupling -22 for attachment to a cooperating coupling 23 of a garden hose 24 or any other conduit from a source of water under pressure. The throat of the Venturi tube is of lesser diameter on the water intake side thereof than on the outlet side, as shown, and in open communication with the latter is an air intake A.

In the modified form of the invention shown in Fig ure '5 the inflatable tubes 12A, 13A and 14A are in communication with each other for inflating purposes by means of a manifold or tube 25, fittings 26 and a T-fitting 27 provided with'an air release valve 28. The tube 12A is provided with a Venturi tube 20A having an air intake opening B and the tube 12A thus serves as a separation chamber ina manner similar to the separation tank 1 of Figure 1. The tube 12A is provided with an air outlet opening 29 in open communication with the manifold 25 and a water outlet 30 in communication with the bottom end of a standpipe 8A for supplying water to fill the pool which is provided with a conventional watertight floor 31.

Since it is the object of the invention to simultaneously supply water under pressure to the pool and air com: pressed by the water pressure'to inflate the tubes, this can be readily accomplished by merely attaching the intake chamber 6 where the air will, of course, escape from the water into the space within the tank above the water level. When the water level exceeds the height of the outlet opening 9 into the standpipe 8 the air within the tank will be forced through the air hose 18 and progressively into the inflatable tubes 12, 13 and 14 of the swimming pool. At the same time the water will flow upwardly and out through the standpipe and into the pool to fill the same.

When the inflatable tubes 12, 13 and 14 become filled with air, the resultant back pressure will lower the water level in the water outlet chamber 7 and open the opening 9 in the standpipe 8 to thus allow surplus air and water to escape out through the standpipe.

The ultimate air pressure within the tubes is determined by the height of the water column within the vertical portion of the standpipe which may be varied to provide desired air pressures.

The constriction 17 in the air outlet fitting 16 is designed to work in conjunction with the air intake A of the Venturi and is of such size as to prevent water from escaping through the fitting 16 even when discharging at atmospheric pressure. Thus the water level will be maintained within the tank 1 above the bathe plate 5 Patented July 1, 1958 until back pressure from the inflated tubes will lower the water level in chamber 7 as aforesaid. It is desirable that the standpipe be of greater diameter than that of the water supply hose 24 sons to prevent any ,appreci-- able drop in water pressure flowing through the standplpe. a

Reverting to the modification shown in Figure 5, the Venturi tube 20A is provided with a ball check valve 32 at its outlet end retained therein by a perforated cap 33 and cooperating with a valve seat 34. Water and air combined within the Venturi tube will enter the inflatable tube 12A. The water will flow out through the outlet opening 30 and standpipe 8A to fill the swimming pool. Air trapped above the water level within the tube 12A will be forced upwardly through the manifold 25 and fittings 26 into the tubes 13A and 14A to inflate the same. The back pressure of air upon full inflation of the last mentioned tubes will cause final inflation of tube 12A as surplus water and air escape through the standpipe and into the pool. When the pool is filled and the water supply turned ofi the ultimate air pressure will force the check valve to its seat to seal off the Venturi tube and the ultimate air pressure, an in the first form of the invention, will be determined by the height of the water column remaining in the stand pipe 8A.

The standpipe 8A acts as a valve more or less and as mentioned determines the final pressure in the air chambers .of the swimming pool which in ordinary use is very small. gest themselves for this purpose such as a spring release valve set to open at a predetermined pressure.

A Venturi of the type shown and properly designed will draw in several times as much volume of air as water passing through the Venturiand consequently fill the tubes 13A and 14A with air when tube 12A becomes only partially filled with water thus preventing any water from entering tubes 13A and 14A.

The bottom tube 12A as shown in Figure for practical reasons is in reality aseparation chamber for separating the combined air and water thus rendering the swimming pool completely self-inflatable. It is obvious that other chambers may conceivably be attached to the pool for this purpose without departing from the scope of this invention.

While a swimming pool is shown in which the pool It is obvious that other means might sug fills with water and the air chambers with air at the same time it is obvious that this invention could also be used in like manner for inflating other objects such as an air mattress for example by simply using the air and diverting the water as waste.

While I have shown and described particular forms of embodiment of my invention I am aware that many minor changes therein will readily suggest themselves to others skilled in the art without departing from the spirit and scope of the invention. Having thus described my invention what I claim as new and desire to protect by Letters Patent is:

A swimming pool comprising a bottom wall secured to the bottom tube of a plurality of inflatable tubes stacked one upon the other and in communication with each other for inflation purposes, said bottom tube having an air outlet opening in communication through a manifold with the interior of the other of said tubes and a water outlet in open communication with the bottom end of a standpipe extending to a height above said pool at a point below said air outlet opening and adapted to deliver water to the interior of the pool, a Venturi tube adapted at one of its ends for connection to a source of water pressure and in communication at its opposite end through a check valve with the interior of said bottom tube and having an atmospheric air intake opening intermediate its ends whereby Water and air will combine within the Venturi tube, open said check valve, and flow to the interior of the bottom tube wherein air liberated from the water will be forced into said tubes to inflate the same and the resultant back pressure upon final inflation of said bottom tube surplus air and the water will flow through the standpipe whereby in the absence of water flow into said bottom tube said back pressure will close said check valve and the ultimate air pressure in all of said tubes will be determined by the height of said standpipe and the column of water remaining therein.

References Cited in the file of this patent UNITED STATES PATENTS 2,070,562 Coyne et al. Feb. 16, 1937 2,077,024 Tanner et a1. Apr. 13, 1937 2,084,236 Babb June 15, 1937 2,725,951 Geary Dec. 6, 1955

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2070562 *Mar 6, 1935Feb 16, 1937Coyne William RVacuum producing device
US2077024 *Sep 11, 1935Apr 13, 1937Francis Tanner WilliamSuction device
US2084236 *Jan 6, 1937Jun 15, 1937Donald Babb JohnPortable reservoir
US2725951 *Jul 12, 1952Dec 6, 1955Columbia Southern Chem CorpSampling device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2883676 *Sep 30, 1957Apr 28, 1959Kwake John PSwimming pool cover
US3001208 *Oct 29, 1957Sep 26, 1961Samuel RosoffHydro-therapy equipment
US3250742 *Aug 3, 1962May 10, 1966Pronal SaContainer having a flexible wall
US3419917 *Oct 10, 1966Jan 7, 1969Martin M. SchanklerPrefabricated swimming-pool construction
US5025515 *Jun 14, 1988Jun 25, 1991Michael RhinesPortable bath tub apparatus
U.S. Classification4/509, 417/92
International ClassificationF04F5/24, E04H4/00, F04F5/00, E04H15/20
Cooperative ClassificationF04F5/24, E04H4/0025, E04H15/20, E04H2015/204
European ClassificationE04H15/20, F04F5/24, E04H4/00C1