US3633824A

US3633824A - Spray-producing device in which the output jets are aerated

Info

Publication number: US3633824A
Application number: US839848A
Authority: US
Inventors: Elic P Aghnides
Original assignee: Individual
Current assignee: Individual
Priority date: 1969-07-08
Filing date: 1969-07-08
Publication date: 1972-01-11
Anticipated expiration: 1989-01-11
Also published as: FR2054345A5; DE2033904B2; DE2033904A1; GB1314584A; DE2033904C3

Abstract

A shower head or other device producing a spray in which there are a plurality of high velocity individual jets that at no time overlap each other and which pass through a screen or screens. The screens are so related to the velocity and size of the jets that the jets essentially retain their direction. The jets do not, when they pass through the screens, enlarge to the extent that they touch each other and they do not otherwise coalesce. The output jets form a showerlike discharge of a novel character, each jet being laden with bubbles due to the aerating action resulting from passing through the screens in the presence of air.

Description

llnite tee Patent [72] Inventor Elie P. Aghnides 3,270,964 9/1966 Aghnides.... 239/428.5 Hotel Pierre, 795 Fifth Ave., New York, 3,270,965 9/1966 Aghnides. 239/4285 NY. 10021 3,298,614 1/1967 Aghnides 239/428.5 [2]] Appl. No. 839,848 3,461,901 8/1969 Bucknell et a1. 239/428.5 X

:gfi is? Primary Examiner-Allen N. Knowles Assistant Examiner-Michael Y. Mar Attorneys-William D. Hall, Elliott I. Pollock, Fred C. Philpitt,

7 GOl'gB Vande Sande, Charles Steininger and Robert OUTPUT JETS ARE AERATED Pflddy 24 Claims, 12 Drawing Figs.

[52] U.S. Cl 2139/4285, ABSTRACT: A shower head or other device producing a 239/553.3, 239/590.3, 239/590.5 spray in which there are a plurality of high velocity individual [51] Int. Cl E03c 1/084 jets that at no time overlap each other and which pass through [50] Field of Search 239/428.5, a screen or screens. The screens are so related to the velocity 552, 590, 590.3, 590.5, 553.3, 553.5 and size of the jets that the jets essentially retain their direction. The jets do not, whcn they pass through the screens, [56] References Cited enlarge to the extent that they touch each other and they do UNITED STATES PATENTS not otherwise coalesce. The output jets form a showerlike 2,962,224 11/1960 Aghnides 239/428.5 discharge of a novel Character, each j being laden with 2998928 9/1961 Aghnides 2159/4285 bles due to the aerating action resulting from passing through 2,998,929 9/1961 Aghnides 239/428.5 the Screens the Presence 2,998,933 9/1961 Aghnides 239/428.5

55 52 55 5A L I I 4 5A I 5 q r "u ,ll llfil 5 s, m xl,\\\

INVENTOR Elie P. Aghnides ATTORNEYS PATENTEU JAN] 1 I972 5 3 4 SHEET 2 UF 2 FIG. 5.

In I

INVENTOR Elie P. Aghnides M, Wm 7%4. @4 4 ATTORNEYS SPRAY-PRODUCING DEVICE IN WHICH THE OUTPUT JETS ARE AERATED BACKGROUND OF THE INVENTION Over 30 years ago an aerator was adapted to the household faucet which consisted of one or more jets directing water upon a screen or plate so that the water was aerated. Since that time efforts have been made to adapt the basic faucet aerator principle to a shower head but this has consistently met with failure. One such attempt was my prior U.S. Pat. No. 2,962,224 of Nov. 29, 1960, entitled Aerating Devices For Producing Streams of Large Cross section. In this device the main object of the invention was to produce separate and individual streamlets which were coalesced at the output of the device, and therefore it was provided, during the passage of the streamlets through the screens, that the jets of water fanned out so as essentially to fill a large outlet area with a solid stream of aerated water. Such a device basically failed to replace the conventional shower head as most of the water energy was utilized to provide the maximum possible amount of foam and as the bubbles were quickly dissipated from the lifeless slow-moving stream after it left the outlet of the device, so that the stream gradually decreased its diameter immediately upon discharge from the outlet, thereby resulting in a single small solid stream of unaerated water. Other attempts, to provide a shower head whose output is aerated, have produced little more than one or more lazy output streams. The characteristics of these output streams being entirely dissimilar from the conventional spray produced by a conventional shower head, the result was not satisfactory from the commercial standpoint.

BRIEF SUMMARY OF THE INVENTION The invention resides in providing a means for producing a multiplicity of individual spaced jets of water directed upon one or more screens of such wire size and mesh that the jets essentially retain their direction and emerge at high velocity without in any way coalescing or merging together; thereby forming a spray each jet ofwhich is a bubbly stream.

IN THE DRAWINGS FIG. 1 is a cross-sectional view of one form of the invention.

FIG. 1A is a cross-sectional view of FIG. 1 taken along line 1A 1A.

FIG. 2 is a cross-sectional view of another form of the invention.

FIG. 2A is a cross-sectional view taken along line 2A-2A of FIG. 2.

FIG. 3 is a cross-sectional view of another form of the invention.

FIG. 3A is a cross-sectional view, of a connector which may be utilized with the device of FIG. 3, and is taken along line 3A-3A of FIG. 3.

FIG. 3B is a cross-sectional view of the connector of FIG. 3 in which certain parts constituting a valve have been shifted to an alternate position from that shown in FIG. 3.

FIG. 3C is a detailed view of one feature of the invention taken along line 3C-3C of FIG. 3.

FIG. 4 is a cross-sectional view of another form of the invention.

FIG. 4A is a cross-sectional view taken along line 4A-4A of FIG. 4.

In connection with all of the forms of the invention set forth hereinbelow, it is to be understood that there is an upstream jet-forming diaphragm which produces a multiplicity of individual jets of high velocity. These jets are preferably (though not necessarily) arranged to diverge, and as they pass out the bottom end of the shower head, they strike screens composed of sufficiently small wire and proper mesh so that the jets essentially retain their direction and high speed, although air bubbles have been added thereto. The result is a multiplicity of diverging jets which at no time overlap or in any way coalesce. The resulting spray has the basic characteristic of a conventional shower head to the extent that there are a multiplicity of high-velocity jets, but there is the remarkable difference that these individual jets are, for a limited distance from the shower head, in the form of bubbly streams.

Since shower heads are used under a wide range of water pressures, as well as with different size of pipes for feeding the same, a few examples will now be given to show how to build a suitable aerator adapted to function as a shower head.

A device having nine holes, aggregating 12 sq. mm., in the upstream diaphragm, and a total screen area of 615 sq. mm., produced nine lively foamy streams. When the holes are of square cross section, this would provide an overall periphery of holes in the diaphragm of4l mm., or a screen area per hole of about 68 sq. mm. The screen area divided by the periphery of the holes is 15.

Another typical example is a device having 20 square holes in the upstream disk, and having an aggregate area of 26 sq. mm. The overall aggregate periphery of the holes is 91 mm. The screen area in this case would be 1,133 sq. mm. The screen area divided by the area of the holes is therefore 45, and the screen area per hole is 58 mm.*. The screen area divided by the periphery of the holes is 12.5.

A third example is a device having 38 square holes in the upstream disk, with an aggregate area of 38 sq. mm. The overall periphery of the holes is 152 mm. and the screen area divided by the number of holes 38 mm.". The screen area would therefore be 1,452 sq. mm. The screen area per hole is 38 sq. mm., and the screen area divided by the periphery of the holes is 9.5.

These three devices created back pressures of 60 lbs., 20 lbs., and 12 lbs. respectively on a faucet where standard faucet aerators of a different make produced back pressures varying between 40 and 14 lbs.

To be certain of satisfactory operation, the screen area should be at least the square of the aggregate cross section of the divergent jets passing through the same, assuming that there is a single continuous screen which intercepts the jets and assuming also that the orifices producing said jets have a cross section exceeding 1 mm. diameter. Indeed, division of the overall opening in the diaphragm into too many orifices leaves smaller screen area per orifice, and, moreover, decreases the velocity of the issuing bubbly streams, even though the rate of flow remained about the same.

The devices herein described are designed and adapted to operate on ordinary domestic water supplies. The pressure in a house may vary from 14 to pounds per square inch and the shower heads herein described may be built to work within that range.

The screens used in the shower heads described herein may vary depending on the number used in tandem, but if two parallel screens are used, the wire diameter is preferably less than 1 millimeter in diameter and the openings in the screens are, of course, smaller than the jets of water impinging on the screens. For example there are preferably more than 12 wires per inch.

The jet-forming means used may be of the type disclosed in my U.S. Pat. No. 2,998,929 for Water Aerators, issued Sept. 5, 1961, for delivering jets of brokenup water which require fewer screens. Alternatively (although with less efficiency), the jet-forming means may be simple perforated disks as shown in my US. Pat. No. 2,316,832 entitled Fluid Mixing Device, issued Apr. 20, 1943, or they may be mere perforate disks in conjunction with greater screen resistance.

The term spray as used herein refers to a multiplicity of jets proceeding in the same general direction and having spaces between jets which are large as compared to the transverse dimensions of the jets. The jets of the spray may diverge, especially if they emanate from a small source, and they may be parallel or even converge to a limited degree if they emanate from a large source.

In determining whether the spaces between jets are large as compared to the transverse dimensions of the jets, I make the measurements at 1 foot from the outlet end of the shower head except when the jets gradually converge when my measurements are made adjacent the outlet of the device. This is for the reason that if I measure directly at the outlet of the shower head the result would be misleading in the case of a small shower head producing its spray in the form of diverging jets.

In the appended claims, whenever reference is made to jets or streams of water that has emerged from the mixing means (such as screen means) or which has passed through the screen means which are spaced apart or are spaced widely apart, such spacing shall be determined as provided for in the immediately preceding paragraph.

There are a number of preferred parameters that may be employed in an embodiment of the invention. There are preferably between nine and 38 orifices in the jet-forming means having an aggregate cross-sectional area of between 12 and 38 sq. mm. The aggregate screen area should exceed 12 mm. per orifice in the jet-forming means. Stated another way, the ratio of the aggregate screen area to the aggregate orifice area exceeds 15, and in still another way, the aggregate screen area is greater than 4 times the aggregate periphery of the orifices.

In stating the screen area, it is understood that I refer to the area of only the downstream screen where there are two or more screens in parallel. Moreover, since the water impinges on only a multiplicity of limited portions of the screen, it is possible, at added expense, to adopt either of the following equivalent arrangements, (l eliminate portions of the screen interposed between the jets, or (2), alternatively, to include some solid material in place of the screen intermediate between the areas contacted by the jets. Therefore, in the above specifications, I have assumed a continuous screen which intercepts all of the jets.

In FIG. 1, the aerator includes a pair of superposed screens and 10' carried by inturned lips 19 which are at the lower end of the main casing 16. A main perforated upstream disk or diaphragm 12 has threads 12a to permit the same to be screwed onto a faucet. The upstream disk or diaphragm 12 includes

chambers

17 and 18 which respectively have covers or roofs 17a and 18a for the purposes set forth in and as more fully disclosed in my prior U.S. Pat. No. 2,998,929 for Water Aerators, issued Sept. 5, 1961. Air may enter through openings 14 between webs 15, and thus pass into the mixing chamber which is located between the downstream ends of chambers 17-18 and screen 10. The upstream disk or diaphragm 12 contains an outer circular row of six chambers 17, and an inner circular row of three chambers 18. The

chambers

17 and 18 are widely separated from each other for reasons that will hereinafter appear. The chamber 17, by virtue of the roof 17a, receives water from the faucet only through the outer upper part of the chamber; in other words, generally along path 172;, whereas chamber 18 receives water from two sides along two paths 18b. Below the

chambers

17 and 18 the water fans out as shown at 17c and 18c. The aerator has an outer casing wall 16 which is connected to the upstream disk or diaphragm 12 by the webs so that the aerator is molded in one piece. This is made possible because there are inturned lips 19 holding the loose screen 10. A single centrally located pin 11 extends through holes in the centers of

screen

10 and 10 and has an enlargement 11a below screen 10 to hold the latter more securely in place. To facilitate molding the aerator (except for the screens), in one piece, there are indents or voids 19a in the inturned lip 19 which indents are aligned with the webs or ribs 15. The outer diameter of the upper screen 10 is slightly larger than the inside diameter of casing 16 and its inner diameter is slightly smaller than the inner diameter of pin 11 so that it is press-fitted in place to do away with the need for spacer rings or other supporting device. This permits easy cleaning of the screen from below by means of a brush when the loose screen 10 is pushed against screen 10.

In one specific embodiment of the invention, the center-tocenter diameters of said chambers were l8 mm. in the outer row and 8 mm. in the inner row. Six chambers were provided in the outer row and three in the inner, located in respect to each other as shown in FIG. 1A. The screens used had an effective diameter of approximately 32 mm. and were 40x40 wires of 0.0085-inch wire diameter located 5 to 6 mm. from the discharge end ofchambers l7 and 18. The cross section of the

chambers

17 and 18 were l.l4Xl.l4 mm., and the apertures were 1.14 mm. wide and 0.95 mm. high. As water entering only through the single paths 17b produce divergent jets, the six outer foamy streams produced were divergent as shown by 17b and clearly moved away from each other. The approximate diameter of each of the foamy streams at the discharge end of the aerator was 4 to 6 mm., but varied according to the number of screens used and on the water pressure. When the aforesaid nine foamy streams are parallel instead of being divergent, it may be necessary to further space apart the

chambers

17 and 18 and accordingly extend the screen area to prevent the foamy streams from joining each other. While the device operates well with two screens as shown, it may be advisable to use three screens inasmuch as the rate of water flow is small and the jet velocity is high. With three screens, the space between the chambers should be greater to prevent overlapping of bubbly streams discharged, inasmuch as jets from

chambers

17 and 18 traversing three screens instead of two produce bubbly streams of larger diameters.

In FIG. 2, the aerator embodies upper and lower screens 10 to perform the same function as the screens 10 and 10' of FIG. 1. These screens are supported by casing 20 which is integral with the upstream disk or diaphragm 21. This diaphragm has three annular rows of

chambers

22, 23 and 24, terminating at their upstream ends in roofs or bridges 1811 which perform the function of the roofs or bridges 18a of FIG. 1. The center-tocenter distances of chambers 22 in one form of the invention were 29 mm. and between chambers 23, those distances were 21 mm. Between chambers 24, those distances were 13 mm. The diameter of the screen area was about 40 mm. The outer annular row of chambers 22 comprises eight chambers, the middle annular row of chambers 23 comprises four chambers, and there are four chambers 24 in the inner annular row. Hence the aerator produced 16 foamy streams with no more water than was needed by a conventional aerator but with a visibly far greater amount of bubbles for the same splashlessness and/or softness to the touch.

The aerator of FIG. 2 includes a number of ribs or webs 22w which have a seat 23a against which the upper screen 10 is inserted with a press-fit, as was more fully described in connection with FIG. 1. The upper screen 10 has perforations through which the pins 11 pass, these pins being integral with the upstream disk or diaphragm 21. The lower one of the two screens 10 is carried by inturned lip 20a in the bottom of casing 20 and is held in place against upstream pressure (such as if one inserts his finger in the bottom of the aerator) by the pins 11. The jets emanating from the three rows of

chambers

22, 23 and 24, may be caused to diverge by inclining the jets 22 at an angle to the vertical of 6. This may be done, for instance, by dishing the plastic diaphragm 21 so that

chambers

22, 23 and 24 be inclined about 6. This may also be done, even if the diaphragm is not dished, by inclining the sidewalls of

chambers

22, 23 and 24.

When the walls of a chamber are inclined, it is thus possible to incline, for example, both walls 22a and 221), or mold diaphragm 21 with the wall 22a alone inclined. When both of these walls were inclined to direct the jet downwardly and outwardly at an angle of about 6 to the vertical, with a cross section of l. l4 l.l4 mm., the device produced very highly aerated divergent foamy streams. In such a device the distance between the bridges 18a and the top surface of disk 21 was 0.80 mm. The opening into the chambers would in that case be 0.80 mm. on each side. Alternatively, in the device of FIG. 2, the bridge or roof 18a may be replaced by a roof of the type shown at 17a in FIG. 1, to produce divergent foamy streams. In such case, good results are obtained when the chambers 22 have a cross section of l.25 l.25 mm. and the opening between the roof and the top of the upstream diaphragm 21 is l mm. high and 1.25 mm. wide.

The main aerator casing 20 may be connected to a faucet by means of connector 25 having threads 25a to mate with those on casing 20 and threads 25b to mate with those on the faucet. The connector carries a preliminary screen 26 that prevents any foreign bodies being carried into the aerator by the water. With the connector 25 inserted in the aerator 20, as shown in FIG. 2, the threads 25b mate with those of a faucet having male (external) threads. However, if the connector 25 is in verted from the position shown and threads 25a are screwed into the casing 20, the threads 25c are exposed and project above the top of the aerator casing so as to mate with those of a faucet having female (internal) threads.

There are central openings 27 in the screens for admission of air to the mixing chamber which is, of course, immediately above the upper one of screens 10. In the absence of openings 27, the unflooded parts of the screen serve as air passageways.

In FIG. 3, a main diaphragm 32 is adapted to deliver divergent jets 33 on a wide-screen area 10 so as to effect a far greater aeration than would be obtained with a conventional aerator. When the aerator is small, perforate member 14 may be added to make certain the aerated water is divided into separate foamy streams, for the purpose of producing a shower or spray of foamy streams. The aerator of FIG. 3 may be screwed either directly onto a faucet or onto the connector 30 shown in FIGS. 3 and 3B. This connector may be operated to alternatively produce a bubblefree conventional shower or a spray of foamy streams. To attain this dual purpose, the connector consists of a tubular member 37 provided with two openings 38, one opposite the other. Said member 37 is surrounded by a rotatable member 37c, which cooperates with member 37b, and has grooves 38a. Hence, water may be led either to the diaphragm 32 of the aerator or to the opening 38b by rotating member 37c. In the former case, water is directed upon the screens 10 and in the latter case in the absence of screens 10'. Any water that passes through the orifice 38b and strikes screens 10' flows out the opening below those screens, producing a spray of foamy streams.

Webs or ribs 37d connect knurled member 37c to the main supporting member 30. Moreover, as shown in FIG. 3C, the knurled member 37c has a slot or indent 37fin which the lever 372 may move so that the aerator may be selectively controlled to give either the spray of foamy or foamless streams (through orifice 38b), or aerated water through orifice 33 and screens 10.

When the lever 37a is at one end of its range of adjustment, the passageway 38a is closed, as shown in FIG. 3B, it being noted that a valve part 30a (FIG. 3B) which is integral with part 30 is now interposed between the water inlet 38 and the orifice 38b. In such case, the only path for water flow from the faucet is through the orifice 33, and screens 10. If the lever 37e is thrown to its other extreme position, the water may take the alternate path from opening 38, 38a, 38b, to the screens 10, as shown in FIG. 3.

The member 37 has an outwardly turned lip 39 which supports a disk portion 30b of the member 30 to thus support the latter and hold it within the aerator. Disk portion 30b has suitable openings so as not to interfere with water traversing opening 33 (see FIG. 3B).

Instead of connecting the member 37 directly to a faucet, it may be connected to a swivel coupling which in turn may be connected to a faucet, and the reference number F is intended to refer either to the faucet or the swivel connecting device as the case may be. Threads 372 permit the attachment of the device to a corresponding female threaded water spout.

In FIG. 4, the diaphragm 40 includes a series of chambers 41 similar to the chambers 18-18a of FIG. 1, and water from these chambers impinges upon the screens 44. Each chamber 41 discharges its stream into a funnel 42 which has a restricted outlet 43, each screen resting upon the ledge at the top of its restricted outlet 43.

There is a cover in the form of an inverted cup 45 which covers several of the orifices of chambers 41. This cover is used in houses where the water pressure is on the low side of the acceptable pressure range and restricts the fiow of water to the outer ring of orifices or chambers, thus providing the desired high velocity notwithstanding the low operating pressure.

In houses where the water pressure is high, the inverted cup 45 is removed so that water flows through all of the orifices of chambers 41 as well as through the central opening 46, through two screens, and then through outlet funnel 48. Air enters slots 49 in the sidewall of the aerator body 49a.

In FIG. 15, the

orifices

50 and 51 form one set of chambers while the

orifices

52 and 53 form another set of chambers. In

this case each set of orifices discharges through the superposed screens 10 in spaced relation to the other set of orifices so that there is no overlapping of the streams of one of said sets with that of another set. Air enters the side slots 54. Two or three closely adjacent orifices such as 50 and 51, having I mm. cross section each, preferably embodied with bridges 55 of a cross section O.75XO.75 mm., produced also good foamy streams separate from each other. Each individual orifice may have its own bridge 55 or a set of orifices may have a common bridge; both arrangements being illustrated in the drawing.

If the jets are produced by simple orifices in a diaphragm (as, for example, as shown in my prior U.S. Pat. No. 2,316,832, Apr. 20, 1943, Fluid Mixing Device,) each orifice will produce one jet which will in turn produce one foamy stream at the output, whether or not such orifice has a bridge 55. Two or more closely adjacent simple orifices, either with or without bridges 55, may be employed to produce each output foamy stream.

I claim to have invented:

1. A device for producing a spray comprising screen means for finely breaking up and adding air bubbles to jets of water impinging thereon transverse to the surface thereof; and jetforming means for producing a multiplicity of spaced jets of water directed transversely to the surface of the screen means and whose parameters are so related to the wire size and mesh of the screen means that the jets pass through the screen means in essentially straight lines and emerge in the form of a spray which is made up of a multiplicity of individual coherent streams laden with air bubbles and spaced apart widely as compared to their transverse dimensions.

2. A device for producing a spray in which the jets thereof are aerated comprising means for producing a spray made up of a multiplicity of jets each of which is a coherent stream of aerated water and spaced from the other jets widely as compared to the transverse dimensions of the jets, said means comprising a diaphragm producing a multiplicity of jets and screen means having a screen surface transverse to the direction of the jets and so related and proportioned to the jets that the jets pass through the screen means in substantially straight lines and separately emerge laden with bubbles, said first-named means and said second-named means being so related that the spray upon dissipating its bubbles after leaving the second-named means assumes the form of a conventional spray.

3. A device as defined in claim 1 in which there are between nine and 38, both inclusive, jets producing openings in the jetforming means having an aggregate cross-sectional area of between 12 and 38 square millimeters cross section.

4. A device as defined in claim 3 in which the screen means is composed of wires not larger than I millimeter diameter with at least 12 wires per inch.

5. A device as defined in claim 1 in which the screen means is composed of wires not larger than 1 millimeter diameter with at least 12 wires per inch.

6. A device as described in claim 1 in which the jet-forming means has orifices for producing the jets and the aggregate screen area exceeds 12 millimeters per orifice in the jet-forming means.

7. A device as described in claim 2 in which the jet-forming means comprises a multiplicity of orifices and the ratio of aggregate screen area to aggregate orifice area exceeds 15.

8. A device for producing a spray formed by separate foamy streams comprising, jet-forming means for producing jets of high velocity, and fluid mixing means downstream said jetforming means for breaking up said jets and mixing them with air and thereby producing said foamy streams, said jet-forming means having orifices adapted to direct water that impinges said fluid mixing means at areas sufficiently distant from each other to permit access of air around the water traversing each area without direct interference from water impinging neighboring areas and to discharge the aerated water as separate foamy streams.

9. A water aerator comprising a casing, output means near the downstream end of the casing and through which the water is discharged, said output means consisting of screen means adapted to break up a plurality of small, high-velocity spaced jets of water and mix each such jet with air and discharge it as a coherent distinct jet spaced from similar jets produced by the other such jets, and jet-forming means in the casing, spaced upstream from the screen means, for producing a plurality of spaced high-velocity jets directed at the screen means, and which pass through the screen means in straight lines and in spaced relation whereby to produce a shower of spaced distinct aerated jets.

10. A device for producing a spray comprising screen means for finely breaking up and adding air bubbles to jets of water impinging thereon transverse to the surface thereof; and jetforming means for producing a multiplicity of spaced jets of water directed transversely to the surface of the screen means and whose parameters are so related to the wire size and mesh of the screen means that the jets pass through the screen means and emerge in the form of a spray which is made up of coherent streams laden with air bubbles and spaced apart widely as compared to their transverse dimensions.

11. A device for producing a spray as defined in claim 10 in which the jet-forming means comprises a plate with a multiplicity of spaced orifices therein, and means at the upstream ends of the orifices for altering the direction of the water entering the orifices. I

12. A device for producing a spray as defined in claim 10 in which the jet-forming means comprises a plate with a multiplicity of spaced orifices therein, and means for imparting turbulence to the water as it passes through the orifices.

13. A device for producing a spray as defined in claim 10 in which the jet-forming means produces jets at least some of which diverge and which pass through the screen means in straight lines to thus produce a spray at least some of the streams of which diverge.

14. A device for producing a spray as defined in claim 10 in which the jet-forming means includes two concentric rows of orifices, the outer row directing its jets downwardly and outwardly and in diverging relation to the jets in the inner row, all jets being so related to the screen wire diameter and spacing as to pass through the screen in straight lines to thus produce a diverging spray.

15. A device for producing a spray as defined in claim 14 in which the said outer row of orifices is provided with bridge means at the upstream ends of the orifices to direct the water, as it goes downwardly into the orifices, inwardly so that the outputs from the orifices have an outward component.

16. A device for producing a spray as defined in claim 10 in which there is a body for the device having a large diameter as compared to that of the pipe to which the body is adapted to be connected, said body having internal threads at its upper end, and a cylindrical coupler for connecting said body to said pipe, said coupler having external threads on its outer cylindrical wall adapted to mate with said internal threads of the pipe,

said coupler defining a central cylindrical hole therein threaded to mate with external threads on a pipe to which the coupler is adapted to be connected, said coupler also having a ring-shaped rojection of larger diameter than said hole and concentric t erewith, said ring-shaped projection having external threads on the outer surface thereof to mate with internal threads on the pipe to which the connector is adapted for connection.

17. A device for producing a spray as defined in claim 10, in which the device has a body with inner and outer portions, each of said portions including said jet-forming means and said screen means to produce a spray made up of individual coherent bubbly jets, said body being adapted at its upstream end to be connected to a source of water under pressure and including valve means operable to limit the flow of water to one of said portions.

18. A device for producing a spray as defined in claim 10, in which the jet-forming means has a multiplicity of orifices, and means operable to limit the flow of water to only a part of said orifices to thus increase the velocity of the water directed upon the screen means.

19. A device for producing a spray as defined in claim 18, in which the means operable to limit the flow of water comprises closure means adapted to close the entrance opening to at least one orifice.

20. A spray-producing device comprising a chamber adapted to be connected to a source of water under pressure and including means for discharging from the chamber a spray made up of a multiplicity of substantially spaced independent jets, and means for mixing air with the water to render the jets soft, bubbly and whitish for a limited distance after their discharge and permitting the multiplicity of jets to take the form of simple independent jets of a spray if the water of the jets has travelled so far away from the mixing means that the bubbles have dissipated therefrom, whereby an object exposed to the spray is struck by a multiplicity of soft bubbly aerated jets if the object is close to the mixing means and is struck by a conventional spray if the object is far away from the mixing means.

21. A device for producing a spray as defined in claim 8 wherein the jet forming means and the fluid mixing means are so proportioned and arranged that the area of the airspace between the jets is larger than the aggregate area of the jets.

22. A spray-producing device comprising means adapted for connection to a source of water under pressure including aerating means for mixing the water with air to form a large number of small bubbles in the water and dividing means for dividing the water into a multiplicity of streamlets each of which is coherent and remains distinct, separate and apart from the other streamlets to form a spray in which each streamlet in the spray is of very small cross section as compared to the overall cross section of the area covered by the spray whereby if an object is placed near the outlet of the device a multiplicity of foamy spaced streamlets will impinge on the same.

23. A spray-producing device comprising means adapted for connection to a source of water under pressure including dividing means for dividing the water from said source into a multiplicity of spaced separate coherent and independent streamlets and which remain spaced, separate and independent after their discharge from the device, and aerating means for mixing the water with air so that the streamlets include a large number of small bubbles, said dividing means producing streamlets each of which is of very small cross section as compared to the cross section of the airspace between the streamlets.

24. A spray-producing device as defined in claim 23 in which the dividing means comprises a plurality of superposed perforated diaphragms.

Claims

3. A device as defined in claim 1 in which there are between nine and 38, both inclusive, jets producing openings in the jet-forming means having an aggregate cross-sectional area of between 12 and 38 square millimeters cross section.

4. A device as defined in claim 3 in which the screen means is composed of wires not larger than 1 millimeter diameter with at least 12 wires per inch.

8. A device for producing a spray formed by separate foamy streams comprising, jet-forming means for producing jets of high velocity, and fluid mixing means downstream said jet-forming means for breaking up said jets and mixing them with air and thereby producing said foamy streams, said jet-forming means having orifices adapted to direct water that impinges said fluid mixing means at areas sufficiently distant from each other to permit access of air around the water traversing each area without direct interference from water impinging neighboring areas and to discharge the aerated water as separate foamy streams.

10. A device for producing a spray comprising screen means for finely breaking up and adding air bubbles to jets of water impinging thereon transverse to the surface thereof; and jet-forming means for producing a multiplicity of spaced jets of water directed transversely to the surface of the screen means and whose parameters are so related to the wire size and mesh of the screen means that the jets pass through the screen means and emerge in the form of a spray which is made up of coherent streams laden with air bubbles and spaced apart widely as compared to their transverse dimensions.

11. A device for producing a spray as defined in claim 10 in which the jet-forming means comprises a plate with a multiplicity of spaced orifices therein, and means at the upstream ends of the orifices for altering the direction of the water entering the orifices.

16. A device for producing a spray as defined in claim 10 in which there is a body for the device having a large diameter as compared to that of the pipe to which the body is adapted to be connected, said body having internal threads at its upper end, and a cylindrical coupler for connecting said body to said pipe, said coupler having external threads on its outer cylindrical wall adapted to mate with said internal threads of the pipe, said coupler defining a central cylindrical hole therein threaded to mate with external threads on a pipe to which the coupler is adapted to be connected, said coupler also having a ring-shaped projection of larger diameter than said hole and concentric therewith, said ring-shaped projection having external threads on the outer surface thereof to mate with internal threads on the pipe to which the connector is adapted for connection.