US2892317A - Spray gun - Google Patents

Description

Jue 30, 1959 Filed April 12, 195e H. M. HOLMES SPRAY GUN 2 Sheets-Sheet l INVENTOR, j'I/,e/v/ A4, 50145@ BY i 2./ il

June 30, 19594 H. M. HOLMES 2,892,317

SPRAY GUN Filed April l2, 1956 E69 4a l 4 2 Sheets-Sheet 2 E .at

INVENTOR,

United States Patent O SPRAY GUN Hiram M. Holmes, Whittier, Calif. Application April 12, 19,516, Serial N0. 577,789v

1 Claim. (C1. 62-so)4 i The present invention relates broadly to `spray guns, and more specifically to a type of gun wherein a material container is utilized in conjunction with a second container holding a liquefied gas, there being orifice tips provided for both containers whereby, under valver control, the liquefied gas is fed in gaseous form through one orifice tip for drawing material in the material container through its orifice tip for spray purposes.

At the present time, it is common practice in the art to provide lvarious spray materials in a container which houses a pressure gas, such as Freon. Commonly, this type of Vcontainer with the material therein, is termed Aerosol. However, it has beenufound that thel pressure gases commonly used, such as Freon, do not spray certain materials satisfactorily.

An object of the present invention is to so associate a liquefied gas, commonly called a propellant, with a material to be sprayed in a separate container in such a manner that the propellant is not driven into the material to be sprayed, with the result that a smooth solid film is produced androne in which there is` no chemical reaction between the propellant and the material tol be sprayed.

A further object is to so associate an independent propellant with a material which is to' be' sprayed, held in a separate container, that materials which are usually not handled by propellant gases, such as water base materials, become compatible therewith.`

A `further object is a spray g'un wherein thel spray tips may be easily and relatively adjusted for different densities of materials to be sprayed and wherein the device may be utilized readily in the metal fiow industry. In this industry, it is corrimii to use chalk and alcohol and this material may be easily sprayed by Athe present invention. f

A further object is the provision` of a spray gun which permits continuous operation of the spray without any refrigerating effect `at room temperatures.

A further object is'` the provision in a spray gun of a jet 4construction which prevents a drool at the tips of the material to be sprayed.- p y A further object is the provision of a 'spray `'gun which will handle alkalis and acids in a satisfactory manner.

A 'further Objectis a spray gun wherein a pair o'f containers, one for the spray material a'nd 'a second for 4'a liquefied gas or propellant may be h'eld `in working relationship regardless' of any `differerice in the size of the two containers, and without ay tendency lfor the containers to tip.

With relation to the foregoing object, 'containers of various sizes are now on the market for holding pro'- pellant gas, such as liquefied Freo'n. Also, the size for the containers fo'r holding Ythe material to "be sprayed may vary to a large extent. .Difference in `height and diameter of *such containers would, under (ordinary 'circumstances, render it difficult to secure the two containers together in a device of the `character of this invention.

However, with the present invention, thezdevicef-is so ice arranged that the two containers are adjustably held together, to the end that the bases may be in the same plane, thus allowing the two containers to rest on a supporting surface without any tendency to tip or fall over.

Other objects include a spray device which is of simple construction, inexpensive in cost of manufacture, which permits the same container holding the propellant gas to be utilized with other containers which hold different materials to be sprayed, and wherein the cleaning of the tips for the material container and for the propellant is' a simple matter.

With the above mentioned and other objects in view, the invention consists in the novel and useful provision, formation, construction, association, and relative arrangement of parts, members and features, all as shown in a certain embodiment in the accompanying drawings, described generally, and more particularly pointed out in theclaim.

In 'the draw-ings:

Figure l is a fragmentary, partially vertical sectional view of a spray gun illustrating one embodiment of my invention,

Figure 2 is a fragmentary sectional view on an enlarged scale of two tips used in the present embodiment of the invention,

Figure 3 is a fragmentary sectional view on an enlarged scale, takenV on the line 3 3 of Figure 1,

Figure 4 is a fragmentary, partially sectional elevation of a modified form of the invention,

`Figure 5 is an elevation looking in the direction of the-arrow 5` of Figure 4,

`Figure 6 is a sectional view on the line `6--6 of Figure 4, and

- Figure 7 `is a fragmentary sectional view on an enlarged scale of the two tips used in that form of the invention shown in Figure 4.

Referring now to the form of the invention illustrated .in Figures 1 to 3, inclusive, I have provided at 1 a container adapted to store or house a liquefied gas, such as the well known Freon 12, which is dichlorodifiuoromethane, or other materials, such as the genetrons, which are ethylidene fluoride, and difiuorochloroethane. I may utilize other propellants, and particularly the type of propellants which are stable, colorless, non-toxic, nonirritating, non-infiammable and non-corrosive. It is also essential that the propellant have a high vapor pressure at ordinary room temperatures, viz, p.s.i. at 70 F. The propellant in the container 1 is not admixed in any manner with the material to be sprayed and, as a consequence, the container 1 is provided, at 2, with a valve of. the depressible type, there being ,a finger-piece 3 for facilitating such depression. As a valve of this character is^ very common, the same is not detailed in construction. 'Ilhe` propellant is directed upwardly through the valve 2 rwhen said valve is depressed and into a tube 4, with which the valve communicates. As is common in con- 'tanersof the type shown at 1, the container is reduced -i'n diameter at 5, and provided with a conical shoulder at Y6 interconnecting the main diameter portion of the container and the reduced diameter portion 5. I provide a member 7 which has an annular side wall 8 and an annular flange 9 joined to said wall 8, the wall 8 .surrounding the portion of reduced diameter 5 of the con- `tainer and adapted to have pressure engagement therewith, while the fiange 9 rests on top of the container portion 10. Extending radially from the ange 9 is an `elongated bar 11 to which is secured a screw-threaded cover 12 for the material container 13.

The material container 13 may be formed of glass, and is provided with a screw-threaded neck for engagement with the screw-threads of the cover 12. In the present instance, the cover is fastened to the bar 11 by welding and by a rivet 14, which rivet likewise secures an angle bracket 15 to the top of the bar 11. The bracket secures an orifice tip or jet 16, there being a flexible tube 17 interconnecting the tube 4 with the tip 16. The bar and cover carries a threaded tubular shank 18 carrying an orifice tip or jet 19 in right angular relationship to the orifice tip 16, and the threaded tubular shank carries a nut 20 within the contines of cover 12, to which is connected a stand pipe 21 depending Within the container 13. As shown best in Figure 2, the orifice tip 19 is externally provided adjacent the mouth end thereof with an annular bead lip or flange 22. Preferably, the bead lip or flange is transversely arcuate, as shown. The increasing of the external diameter of the orifice tip adjacent the outlet or mouth end thereof effectively overcomes any tendency of the material to be sprayed to flow over the mouth and down the sides of the tip. Thus, all material to be sprayed is directed in spray form when the propellant valve is actuated, and the propellant gas is passing tangential to the mouth of oriiice tip 19. In this respect, it is important that the oriiice 23 of tip 16 should have its axis 24 tangential to or in alignment with the outlet or mouth of orifice tip 19.

The screw cap 12 is provided with a bleeder opening 25 so as to maintain the interior of the container 13 under atmospheric pressure. It is evident that this atmospheric pressure has a direct effect upon the material, indicated at 26, within the container, and which is to be sprayed. Thus, directing the gas from the container 1 through the orifice tip 16 across the top surface of the tip 19 is sufcient to reduce pressure in stand pipe 12 and cause the material 26 to move up the stand pipe and through the tip 19. As long as the material is broken up under gas pressure from the tip 16, there will be no drool or tendency to flow over the top of the tip and down the sides thereof; however, if the gas pressure is not high enough and capillary attraction is present in the material drawn through tip 19, then the material will flow down the sides of the tip 19. The bead or lip portion 22 has been found, in actual practice, to effectively atomize the material when the gas under pressure is directed through tip 16.

Another feature of the present invention resides in the provision of a bag, indicated at 27, within the container 1 which holds the liquid Freon or other material. This bag may be formed from a plastic and is adapted to hold water. The average container 1 will hold a bag containing three and one-half ounces of water and, in addition,

twelve ounces of Freon. Freon freezes at 22 below zero, Fahrenheit, while water freezes at 32 above zero, Fahrenheit. Thus, the water in the bag 27 will furnish heat for the liquid Freon above the freezing point of the water. In order to utilize the device, it is essential, of course, that the Freon should not be at freezing point but preferably at room temperature or 70. Thus, the Freon andthe water will both be at 70. Rapid expansion of the Freon resultant upon depressing the valve 2 to open the same will, if the valve under ordinary circumstances remains depressed, cause excessive cooling within the container 1 of the Freon and hence stop operation of the device; that is to say, the discharge of Freon gas. Therefore, it becomes essential if the device of the present Vinvention is to be used substantially continuously, to provide some means for heat transfer to the liquid Freon to raise its temperature. I have accomplished this desired result by providing the small plastic bag containing water,

and as the liquid Freon is converted into gas, the Water 'in the bag supplies heat to the Freon, with the result that substantially a continuous operation may be performed until all of the Freon has been exhausted from the container 1.

Referring now to Figures 4 to 7, inclusive, I have shown a container 28 which diifers from container 1 in that it has greater length than container 1, and has a smaller diameter. This constitutes the only dierencemerely one of size. In place of providing the ring 8 with its flange 9 for engaging the container, I provide an elongated transversely arcuate plate 29 and the screw cap 30 for the material container 31 is secured to said elongated arcuate plate 29 by means of a radial arm 32 extending from plate 29, as see Figure 6. The plate 29 is provided with a pair of bores in right angular relationship, as shown at 33 and 34, the bore 33 receiving a tip or jet 35 while the bore 34 receives a tubular fitting 36 to which the flexible tube 37 is secured at one end, this tube being the same as the tube 17, shown in Figure 1, and the opposite end of the tube 37 is secured to the extension communicating with the valve for said container 28. As before, the cap and the arm 32 is transversely bored at 38 to receive jet or tip 39 identical with tip 19, which tip is in screw-threaded engagementI with threaded tube or shank 40, which tube 40 is connected to stand pipe 41. As before, a nut 42 is carried on the screw-threaded tube 40 to adjust the height of the tip 39 relative to tip 35. The arcuate plate 29 is provided with a pair of hooks 43 and 44 intermediate the length of said arcuate plate, which hooks connect with looped ends of a coil spring 45. Thus, the material container 31 is held against the pe- .'riphery of the container 28 through the inter-position of the arcuate plate 29 when the coil spring 45 surrounds said container 28, as shown in Figures 4, 5 and 6. If a larger diameter container is utilized, it is obvious that the spring will expand to accommodate the increased diameter and the arcuate plate will engage the periphery of said container by having two points of contact along the side edges of said arcuate plate. The same is true for a smaller diameter container than that shown in the figures. In -Figure 6, the curve of the plate 29 is the same as that of the container periphery. In any event, the arcuate plate stabilizes the two containers. As pointed out in the objects of this invention, if the container 28 is placed upon a support, the container would tip or fall unless the material container was also resting on the same support. The arrangement shown, by providing an arcuate plate which is movable relative to the periphery of the container, allows the bases of both containers 28 and 31 to be so adjusted as to have their bases lying in the same plane. Where the material container, such as shown at 13, is reasonably small and light, and the Freon container 1 is large, the size and weight of the container 1 is such as to effectively hold the material container 13 without any tendency to tip. But where the propellant container, such as 28, is elongated and of small diameter, the means shown in Figures 4, 5 and 6 becomes essential and is effective to prevent any tendency to tip over.

The operation, uses and advantages of the invention just described are as follows:

Whether a container of the type shown at 1 in Figure l Vis utilized, or a container of the type shown at 28, I may `atomization of the material at the orifice of the tip 19,

with a substantially continuous operation until all of the propellant gas is exhausted from the container 1 or all of the material shown at 26 has been sprayed.

That form of the invention shown in Figures 4 to 7 operates on the same principle, the only difference being in the use of the arcuate plate 29 and the spring 45 to lpermit adjustment of the material container relative to the propellant container 28. As before, the screw cap 30 is provided with a bleed opening, as shown at 46, to maintain the container, and speciically the material within the container, under atmospheric pressure.

It is quite evident that in the form of the invention `shown in Figure 1 that the tube 17 may be disconnected from the tube 4, and the flanged annulus 8 removed from the container 1, whereupon a second material container may be associated with the container 1, by reconnecting its tube 17 therewith. Such an operation requires but a few seconds of time. This is also true for the form of the invention shown in Figures 4 to 6 inclusive, and either a new material container may be applied to the screw cap or the material container, or its cap and arcuate plate may be removed from the propellant container 28 with the end of the tube 37 connected to a new assembly.

The adjustment permitted the tubes 18 or 40 by a turning of the nut 20 or 42 allows a regulation of the tips 19 and 39 to correctly position the orifice mouth of said tips relative to the orifice in the tips 16 and 35.

I claim:

In means of the character disclosed, a container for holding liquefied gas, the said container provided with a valve for controlling discharge of the liquefied gas in gaseous form under pressure, and heat transfer means comprising an impervious bag lled with water within the said container and surrounded by said liqueied gas for maintaining gas ow from said container when the valve is opened.

References Cited in the file of this patent UNITED STATES PATENTS 2,030,853 Budwig Feb. 18, 1936 2,635,921 Deutsch Apr. 21, 1953 2,689,768 Falligant Sept. 21, 1954 2,705,661 Meissner Apr. 5, 1955 15 2,745,700 Phalen May 15, 1956 FOREIGN PATENTS 350,908 Great Britain June 15, 1931

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