US2567099A - Spraying device - Google Patents

Description

J. W. BUSS SPRAYING DEVICE Sept. 4, 1951 Filed Jan. 2, 1948 INVENTOR.

John W Buss ATTORNEY.

Patented Sept. 4, 1951 UNITED STATES PATENT OFF SPRAYING DEVICE John W. Buss, Canton, Ohio, assignor to The Hoover Company, North Canton, Ohio, a corporation of Ohio Application January 2, 1948, Serial No. 259

3 Claims.

This invention relates to sprayers and similar devices, and more particularly to a means for controlling the operation of a sprayer or other device which is supplied with a continuous current of air. This invention is an improvement over the air supply controlling means as disclosed and claimed in the U. S. Patent 1,911,366 granted to W. H. Kitto et al. on May 30, 1933, and. which is assigned to a common assignee, The Hoover Company, a corporation of Ohio.

One of the objects of the invention is to provide a sprayer which is of rugged and simple construction and which can be economically manufactured.

A further object is to provide a device of the type which can be conveniently used, and in which the spraying action can be easily and effectively controlled between wide limits and tendency to dribble will be avoided. I

A still further object is the provision of simple and eflicient means for controlling the flow of air from a source of continuous supply to a device of thi kind by which the air flow can be.

varied as desired without materially varying the back pressure upon the air supplying means.

Still further objects of the invention, as well as the novel features of construction and operation will be understood upon a reading of the following description of a preferred embodiment of the invention shown in the accompanying drawings, in which:

Figure 1 is a plan view of a sprayer partly in section embodying the invention;

Figure 2 is a View in longitudinal section partly in side elevation taken along line 22 of Figure 1, looking in the direction of the arrows; and

Figure 3 is a view in longitudinal section partly in side elevation taken along the line 3-3 of Figure 1 looking in the direction of the arrows.

As shown the main body of the spraying device III is in the form of a cover I I having an integrally molded internally threaded collar I2 t detachably receive cooperating threads I4 on the top of a glass jar I3. On the top I Iis formed a tube I5 having a bore I6 and a. downwardly opening recess M. -The bore I6 extends'rearwardly and is tapered at I! for detachable connection with a blower tube I'I connected'to the blower outlet of a suction cleaner. The cover I I, the tube I5, and the threaded collar I2 are integrally molded from suitable thermoplastic material.

A metal tube I8 is soldered at 24' in an opening 24 passing through a metal closure I9 positioned against the shoulder in a threaded collar I2. The closure I9 is attached to the shoulder in collar I2 by screws 20 interfitting with threaded holes 2| in the cover II. A gasket 25 is positioned between the closure I9 and the top edge of the jar I3. The tube I8 is curved forwardly and tapered to form a sprayer-nozzle 22 positioned centrally of an opening 23 in the forin the cover II.

ward end of the bore I6 and centered therein and its lower end extends downwardly to adjacent the front bottom corner of the jar I3 as shown in Fig. 2. The downwardly opening recess 4I communicates with the interior of the jar I3 by means of a restricted orifice 26 formed in the closure I9. I

To one side of the tube I5 the cover II is provided with a recess for receiving a metal insert 42 having a lower valve orifice 28 and a threaded opening 23 for receiving the threads of a control valve 21 knurled at 3| and tapered at its lower end at 30 to cooperate with the orifice 28. Communicating with the orifice 28 is a side opening 43 in the insert 42 which in turn communicates with the outside atmosphere by an opening 29 The orifice 28 communicates with a recess 34 formed in the lower face of the cover II which in turn communicates with the interior of the jar I3 through an opening 36 extending through the closure I9 below the recess 34.

The-closure I9 is provided with an opening 40 in which is riveted a vertically extending tube 39 extending upwardly through the recess 4| and bore I6 and tightly fitting into a bore 38 through the top wall of the tube I5. A top opening 31 of the bore 38, in conjunction with the operator's thumb, forms a valve as will presently appear. In assembling the device the tube I8 is soldered to the closure I9 and the tube 39 riveted thereto. Those parts thus form a unitary replacement assembly to be detachably secured in the threaded collar I2 by the screws 20.

Operation The jar I3 is filled with paint or other fluid to be sprayed, the cover II replaced, the blower fitting II inserted in the tapered opening I! of the tube I5 and the cleaner or other source of air pressure energized.

Air will pass through the bore I6 and through the opening 23 but no fluid will be forced upwardly in the tube I8 because the interior of the jar I3 is opened to atmosphere through the tube 39. When it is desired to spray paint or other fluid, the thumb of the operator is placed over the opening 31 to entirely close that opening. At that time the pressure over the liquid in the jar I3 will be that of the static pressure in the bore I6, atmospheric, or some pressure between the two depending upon the setting of the control valve 21.

If a heavy spray of liquid is desired the valve 21 is operated to move the tapered end 39 in a direction to close the orifice 28. If a lighter spray is desired the valve 21 is rotated in a direction to open the orifice 28. p

The raised pressure over the liquid in the jar I5 will cause the liquid to rise in the tube I8 and be projected through the atomizing nozzle '22. Air under pressure leaving the bore I3 through the opening 23 will aid in atomizing the liquid leaving the nozzle 22 and will also aid in the flow of liquid through the tube [8 by its aspirating effect.

The use of the needle valve 21 has particular utility in the type of sprayer to which this invention relates so that the operator need not be careful with regard to the extent the opening 31 is closed but may completely close that opening with his thumb whenever it is desired to use the sprayer. The quantity of liquid ejected through the nozzle 22 is nicely adjusted by the needle valve 21 regardless of the viscosity or thinness of the liquid beingsprayed.

In, prior art. Sprayers of the general type herein disclosed it was necessary for the operator to be quite skilled since the amount of closing of thegthumb: opening changed with the thickness of the spray desired as well as with the viscosity or thinness of the liquid being sprayed.

While a preferred embodiment of the invention in a spraying device has been shown and described, it. will be understood that variations It is also to be "downwardly from said cover and having a shouldered recess for detachably receiving the open end of said container, said recess being in open communication with a bore extending longitudinally of said cover above said recess, an integral extension on said cover extending rearwardly thereof and including an extension of said bore, said extension being formed for detachable connection with a fitting for leading air under pressure to said bore, said cover having a retricted opening forming a continuation of said bore centrally thereof at the forward end thereof whereby a static pressure is produced in said bore by the flow of air under pressure therethrough, said cover having a downwardly opening recess to one side of said bore in open communication with said therefrom may be made without departing from I the scope of the invention. understood that the. invention may be applied shouldered recess, said cover having a vent op'ening between said downwardly opening recess and the atmosphere, a closure detachably secured against the shoulder of said shouldered recess and closing off communication between said downwardly opening recess and said bore and said shouldered recess, said closure having restricted openings therethrough below said downwardly opening recess and below said bore for connecting them with said shouldered recess, a valve for restricting air flow through said vent opening, a liquid tube permanently carried by said closure and having one end extending downwardly into said container and its other end extending upwardly and forwardly to the center of said forwardly extending restricted opening and a control tube permanently-carried by said closure connecting said shouldered recess to atmospheric pressure whereby the interior of said container may be selectively subjected to atmospheric pressure or to a static pressure in said bore, the value of which is governed by the setting of said valve.

2. A spray head comprising an integrally mold- 4 ed-plastic-body and a permanently assembled accessory for detachable assembly to said body; said body including a downwardly extending annular collar for detachably receiving the open top of a liquid receiving container and having a downwardly facing. shoulder interiorly thereof and a horizontally extending tube interiorly connected with the interior of said collar, said tube including an open. ended rearward extension for detachably receiving the end of the tube connectedto a source of air under pressure and a forward extension having a restricted central opening, said tube being provided with. an opening in its upper wall above said-collar; said accessorycomprising a metallic plate; lying. within said collar against. said shoulder, a vertically rising liquid tube passing through said plate. and

welded thereto and having, a nozzle extending forwardly into the restricted opening in the forwardextension of said body and a vertical air control' tube having its lower end permanently secured to said plate and its open upper end extending upwardly into the openingin the. upper wall ofthe horizontally extending tube of said body; said accessory being provided with a vent opening connecting the interior of the horizontally extending tube and collar of said body.

3; A spray head comprising a molded plastic body I'll and a permanently assembled accessory for detachable assembly with the body In; said accessory consisting of an annular metallic'cover plate la, a metallic small diameter tube 18 extending through an opening inand permanently secured to the plate 19, one end of tube I8 extending substantially perpendicularly from one side of the plate l9 and its other end extending from the other side of plate l9 in substantially an arc ofa circle and having a restricted nozzle 22 extending beyond the edge of plate i8 and a the collar f2, having its interior in communication with the interior of the collar 12', having a bore I1 at one end to receive a tube connected to a source of air under pressure, having a restricted opening 23. at its other end and having an opening '37 in its top wall opposite the collar [2 of a size to snugly receive the end of tube 39; the arrangement being such that when said accessory is assembled with the body 10, the plate [9 will rest against the shoulder of collar '2, the nozzle 2'2 of tube I8 will be positioned centrally of opening 23 and the end of tube 39 will be positioned in opening 31.

JOHN W. Buss.

REFERENCES CITED The following references are of record in the file of this patents UNITED STATES PATENTS Number I

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