US2343163A - Spraying device - Google Patents

Description

Feb.. 29, 1944. E W, VSE l 2,343,163

SPRAYING DEVICE Filed Oct. 1l, 1940 2 Sheets-Sheet l INVENTOR: Edu/m W Vos@ ATTORN EYS Feb. 29, 1944. E, YW, vOsE 2,343,163

I SPRAYING DEVICE' l Filed Oct. 11, 1940 2 Sheets-Sheet 2 ATTORNEYS.

Patented Feb. 29, 1944 UNH-eo 'STATES PATENT, OFFICE SPRAYING DEVICE Edwin W. Vose, Orange, N. J., assignor to Benja min Foster Company, a corporation of Dela- Application October 11, 1940, Serial No. 360,737

9 Claims. (Cl. ill- 45) This invention relates to improvements in spraying devices and has for a main object the provision of a device for applying divided solid materials to surfaces, the application of said materials being effected by a fluid medium under pressure, and the feeding of said materials to the stream of said medium being effected by a stream of atmospheric air controlled by the quantity and pressure of said medium passing through the device.

-Another object of the invention is the provision, in al spraying device, of a spray nozzle, means for producing an air stream therethrough, and means for admitting to the body of said nozzle a mixture of divided solidv matter and atmospheric air.

Still another object of the invention is the provision, in a spraying device, of a spray nozzle, means for producing an air stream therethrough, means Within said nozzle for producing a partial vacuum, a body of divided solid matter in communication with said last means, and means permitting atmospheric air to pass through at least a portion of the body of divided solid matter, thereby forming a mixture of air and ysaid solid matter which passes into said air stream within said nozzle.

A further object of the invention is the provision, in a spraying device, of a spray nozzle, means for producing an air stream therethrough, a chamber about the body of said nozzle for material to be sprayed, means for supplying material to said chamber, means in said nozzle for creating a partial vacuum, a passage between said chamber and the point in said nozzle Where said partial y vacuum is formed, and means in said chamber for admitting atmospheric air so that the -latter may agitate the material Within a given area in said chamber while passing therethrough into said nozzle via said passage. The atmospheric air in agitating the material in the chamber as described, prevents the material from being compacted in said chamber and delivers material to the air stream within the nozzle at a substantially uniform rate and thereby enables the operator to make an even distribution of the material over a surface being treated.

In the embodiment of the invention herein described, the means for admitting atmospheric air to the chamber comprises an opening in the bottom of the chamber, which opening is covered with a wire mesh screen. vIt is obvious that with such an arrangement the particles of divided solid material mustnot be smaller than the openings in the screen or the materials will sift through.

ISISI However, I am not limited to the location of the opening in the bottom wall of the chamber. For example, my device will handle powdered materials as Well as the coarser materials, in which event the opening in the wall of the chamber for admitting atmospheric air is positioned Where the material, whether it be coarsely divided or finely divided, cannotr sift out through the screen covering the opening. This may be visualized by turning the device illustrated herein through an angle of and operating it in such position. In some instances, however, it is preferable that Athe injector tube extend vertically into the Venturi portion of the nozzle from below.

An example of the use of my new and improved device is ein' connection with the treatment of roofs for applying thereto, after the same has been coated with cementitious material, a coating of decorative and weather resistant granules, such forexample as, ground oyster shells. Another example is the surfacing of walls, ceilings, etc., with divided solid materials, for decorative pur-4 poses, for water proofing, for sound proong, to dampen vibrations in sheet metal walls, oors, ceilings and partitions, and/or for insulating the same. I lhave successfully applied a wide range of materials, from light flakes of asbestos to heavymetallic compounds in the form of granules or powders, such as for example, iron pyrites.

-In the accompanying drawings which show one embodimentof the invention by way of example:

Figure l is a side elevation of the spraying device with the material holding bag and the air `supplying means omitted;

Figure 2 is a cross-sectional elevation of the device shown in Figure 1;

Figure 3 isa view-of the device as seen from i the bottom;

Figure 4 is a transverse cross-sectional elevation of the device taken along the line 4'4 of Figure 2;

Y Figure 5 is a plan view of the device; and

Figure 6 is a cross-sectional view of the device similar to Figure 2 except that details of one method of securing the material bag to the device are shown, and a motor driven blower is shown assecured to the device and comprising a source off air-ithereforg-` which, extending inwardly from the front wall I I, is counterbored to form a iit with a tube I8. The tube I8, is secured in position by means of a screw I9, extending through the tubular wall I5, or by any other suitable means.

The boss I6, has a bore 20, formed therein to rit the discharge tube of a suitable blower or other source A`of air forlthe device, which will presently be described. Within the boss I6, and

joining the bore I1 and the bore 20, is a tapered bore 2I.

A hole 22 is formed in the wall of the tubular" portion, extending upwardly therein and posiof said annular portion below the overhanging bead 21. The bags may each contain, for example, about twenty-iive pounds of material. This arrangement may be seen in Figure 6.

A spring 35, secured to the boss IB, by means of a screw 36, has an upturned end 31 adapted to be engaged by the operators finger, and a plunger 38, which extends through a suitable hole formed in the wall of the boss I6 and into the interior bore thereof.

As may be seen in Figure 6, a portable blower 39 having a motor 40 for driving the same may have a discharge conduit 4I, a portion 42 of tioned adjacent to the vertical center line of the Y body.

Mounted within the hole 22, is a tube 23, having its upper end beveled` oif with its beveled u portion 24 directed toward the outlet-tube I8.-

The lower end of the tube 23, terminates with the chamber 25, formed within the body I0.

The walls I I, I2, I3 and` I4 terminate in an annular'portion '23, at the top of the body, and an overhanging bead 21 is formed at the top of the annular portion 26, to 'facilitate the retaining of a vmaterial bag thereon, as will presently be described. The bottomwall 21, of the body has an opening 23, formed therein which, for convenience, is round. A portion of the opening 28, is counterbored to form a larger opening 29, with a shoulder 3B, formed therebetween. A'groove is formed in the wall of the counterbored portion 29.

A suitable screen 32, is mounted in the counterbored opening `29, and rests against the shoulder 30, andV a spring ring 33 is snapped into the groove 3|, for retaining the screen 32 in position against the shoulder. The spring in the position above described may be seen in Figure 3.

It willl be noted from Figure 4 that the chamber 25 completely surrounds the tubular portion I5, and it is .obvious that when air is delivered into the device via .the bores or openings I1, 20,

2I, a Venturi effect is obtained and partial vacuum is thereby created in the vicinity of the bev- Ieled portion 24 ofthe tube 23. The tendency is,

when divided solid material is contained in the ,chamber 25, for such material to pass up through the tube 23 `Where it will thereby be delivered to the ,air stream passing throughthe device and willpass out along with the discharged air. The tube 23 might 4be termed an injector tube.

It hasbeen foundhoweven'that divided solid -materialswill tend toV pack or bridge, and

thereby the feeding of the materials into the air stream is retarded. This results in unequal deposits of the material on the surface being treated vand make it necessary for the operator to go over many thin areas appearing on the surface being treated.

I have found that by providing an opening such as the opening 28, atmospheric air passes through the bottom of the chamber into the air stream yvia the injector tube 23, and while so doing agi- .tates and stirs up the particles or granules of Ymaterial in,A the bottom of the chamber and delivers them-to .the air stream at a uniform rate.

It hasl been found that a very convenient way to supply the material to the device is to put the material up in fabric bags designated by the nu- ...meral 50, the open end 49.0f which may be fitted loverand secured to the annular portion 26 of the body, a suitable band or strap 5I being pro- Avided for the purpose. Theband or strap 35 engages the open mouth 49 of the bag 50, and holds Athe same inI intimate contact with the outer Wall blowerand my new and improved spraying device together in cooperative relation. In order to detach the blower, the operator lifts the end 31 of the spring, thereby disengaging the plunger from the hole in the portion 42 and permitting the blower to be detached from the device.

To facilitate the handling of the combination, a suitable handle 43 is provided, one end of which is secured to a bracket 44 mounted on the blower, and the other end of which is secured to a bracket 45 also mounted on the blower. A suitable tie screw 41 extends through the brackets, and the handle, and is secured in position by means of a nut 48. The brackets 44 and 45 may be secured to the blower in any suitable manner; for example, by means of screws 46.

I have found that an operator using my device can efficiently apply materials to slanting roofs without hazard with the device herein described having a twenty pound bag of material attached thereto. The upper end of the bag may be suspended from a strap o-r harness passing around the shoulder of the operator. If the operator is right handed', the strap passes over his left shoulder, or if he is left handed the strap passes over his right shoulder. A right-handed man while treating the surface of a roof may carry the strap over his left shoulder lwith the bag suspended therefrom, and when he reaches the left end of the roof he may readily change the strap over to his right shoulder and finish the last few feet of the surface of the roof left handedly.

Although I have, by way of example, shown and described one embodiment of my new and improved spraying device for divided solid materials, it is obvious that many changes may be made in the arrangement shown and described without departing from the spirit of the invention as set forth in the annexed claims.

What is claimed is:

1. In apparatus for spraying divided solid material, in combination, a nozzle, means to produce an air stream therethrough, means in said nozzle under the influence of said air stream for maintaining a sub-atmospheric pressure within a zone Vin said nozzle, a chamber adjacent to said zone for containing a supply of said material, a passage for said material leading from said chamber to said zone, an opening formed in a wall in said chamber below the level of said material for the admission of atmospheric air thereto, whereby said atmospheric air may pass through said chamber and said passage to said zone, and means associated with said opening for preventing said material from sifting out of said chamber, said atmospheric air being `adapted when passing through said chamber as aforesaid to agitate the material in said chamasas-,free .3

ber within an area'extending from Vsaid opening to said passage and to 'eiect the delivery of a constant stream of said material via said passage to said zone.

2'. In apparatus fdr spraying divided soiid matter, in combination, a nozzle, means to produce an air stream therethrough, a zone in said nozzle of reduced diameter to produce a Venturi eiect when said air stream passes therethrough, .a reservoir partially embracing said `nozzle 'for containing materials to be sprayed, means forminga passageangular with respect to said nozzle and extending from said reservoir to the interior of said nozzle, and an opening in a wall of said reservoir adjacent to said nozzle and communicating with the atmosphere, whereby atmospheric air may pass via said opening, through said reservoir and via said passage to the air stream in said nozzle and thereby agitate and carry material from said reservoir via said passage to said air stream.

3. A spraying device for divided solid material including, a nozzle, means for producing an air stream therethrough, a reservoir for said material including at least one wall adjacent to n said nozzle, an opening formed in said wall below the level of said material, a screen covering said opening, and a tube having one end communicating with said reservoir and having its other end under the influence of said air stream within said nozzle, whereby atmospheric air enters said reservoir, agitates the material therein and delivers the same to said air stream in `a constant and denite ratio to the pressure and the volume rate of said air stream passing through said nozzle.

4. In apparatus for spraying divided solid matter, in combination, a spray nozzle having a longitudinal passage therethrough, a portion of which has a smaller cross-sectional area than the remainder, means for producing an air stream therethrough, a chamber partially. embracing at least a portion of said nozzle and having an extension projecting therefrom, a material opening formed in said extension, a container of divided solid matter having one end thereof secured to said extension and having its other end substantially above said nozzle whereby said material may ilow into said chamber by gravity, a tubular member extending laterally from said chamber to the interior ci said nozzle and communicating with said chamber and with said portion of the passage in said nozzle, and a second opening formed in a wall of said chamber adjacent to said tubular member and communicating with the atmosphere whereby atmospheric air may pass through said last-men tioned opening, thence through material in said chamber lying between said second opening and said tubular member, and then via said injector for agitating and entraining a stream of divided solid matter and carrying the same to said air stream.

5. In apparatus for spraying divided solid material, in combination, a nozzle, means for producing an air stream therethrough, a venturi in said nozzle, a chamber partially embracing at least a portion of -said nozzle, a material opening formed in one wall of said chamber and having an annular wall projecting therefrom and forming an extension thereof, an outwardly extending bead formed about said annular wall adjacent to its outer end, a flexible container of divided solid matter having one end thereof engaging said annular wall and having its other end substantially` above said'. nozzle whereby said material may iiow into said chamber by' gravity, means embracing said container adjacent to said nrstmentioned end and positioned between said chamber and said bead for retaining said container on said annulus, a hollow tube extending from said chamber to a point in the interior of said nozzle under the influence of said venturi, and Y a screened opening formed in an. outer wall of .said chamber adjacent to said hollow tube for permitting atmospheric. airlto pass through the material in said chamber between 4said screenedopening and the chamber end of said hollow tube, thereby agitating and entraining said material and delivering the same to said air stream.

6. In a spraying device for divided solid materials, a body having a chamber formed therein, an annular boss extending laterally across said chamber, a second annular boss extending from said -body in substantially axial alignment with said rst boss, an air stream passage formed in and extending through both said annular bosses, the portion of said passage in said second boss being larger in diameter than the remainder of the passage and adapted to have the discharge port of a blower tted thereto, means on said second boss for securing the same to said blower, a venturi formed in said air stream passage, a hollow tube mounted in said annular wall and extending from said chamber to a point in the interior of said passage under the iniluence of said venturi, a tube mounted in said body in axial alignment with said passage and forming a discharge nozzle for said device, an annular neck formed on said body, the hollow therein forming a passage through which said divided solid materials are delivered to the interior of said chamber, and an opening formed in the wall of said chamber through which atmospheric air may pass through material in said chamber, thereby agitating and entraining said material and delivering the same to the air stream in said passage.

7. In a spraying device for divided solid materials, a body having a nozzle extending therefrom.

' said body having a hollow chamber formed therein, an annular boss extending laterally across said chamber in axial alignment with said nozzle, said boss having a bore formed therein communicating with the interior of said nozzle and having a venturi formed therein, means on said body for attaching the same to a source oi said solid materials, means for passing an air stream through said bore and said nozzle, a hollow tube extending through the wall of said boss and extending from said chamber to a point in the vicinity of said venturi whereby when an air stream passes through the latter a suction is created at the inner end of said hollow tube, and means forming an opening in the wall of said chamber adjacent to said hollow tube, whereby atmospheric air in a stream proportional to the rate of ow of said air stream, passes through said opening and via said hollow tube to said air stream.

8. In apparatus for spraying divided solid matter, in combination, a chamber lfor said matter, a spray nozzle extending through said chainber, means for producing an air stream through said nozzle, a restriction in said nozzle for producing sub-atmospheric pressuresin a zone therein under control of said air stream, means communicating directly with said zone and indirectly with the atmosphere via an opening in the wall of said chamber below the level of matter therein for effecting the admission of a stream of atmospheric in said hopper, and an opening substantially larger in diameter than said tubular member formed in a Wall of said hopper below the level of material therein and in communication with the atmosphere, whereby said secondary stream rushes from the atmosphere and through said opening to said tubular member, forming within the material therebetwen a. conical zone in which said material is vigorously agitated and is entrained and delivered to said primary air stream in said nozzle.

EDWIN W. VOSE.

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