US2910248A

US2910248A - Spray gun

Info

Publication number: US2910248A
Application number: US635180A
Authority: US
Inventors: Kenneth E Kueter; Walter S Maxim
Original assignee: KEMAX CORP
Current assignee: KEMAX Corp
Priority date: 1957-01-22
Filing date: 1957-01-22
Publication date: 1959-10-27
Anticipated expiration: 1976-10-27

Description

Oct. 27, 1959 K. E. KUETER ETAL 2,910,248

SPRAY'GUN Filed Jan. 22, 1957 2 Sheets-Sheet 1 I n Ver? for@ v Oct. 27, 1959 K. E. KUETER ETAL Y 2,910,248

In vm tons SPRAY GUN Kenneth E. Kueter, Lake Forest, and Walter S. 'Maxim, Libertyville, 1li., assignors to The Kemax Corporation, a corporation of Illinois Application January 22, 1957, Serial No. 635,180

r1 claims. (ci. 239-413) This invention, which is a continuation-impart of application 479,988 tiled January 5, 1955, now ab-andoned, relates to an improved fluid spray gun andy more particularly to a spray -gun which will more conveniently discharge a. fluid in a controlled stream.

The accumulation of dirt and debris formed on the surfaces of animal cages, food processing equipment, automotive engines, and on industrial equipment'is generally removed by applying to said surfaces a detergent solution, and this can most conveniently be accomplished by directing a controlled stream of a detergent traveling at a relatively high velocity against said surfaces followed by rinsing the surfaces with a stream of water and drying with air, thereby removing the undesirable material an effecting the desired cleansing.

It is, therefore, a general object of the present invention to provide an improved and more convenient apparatus for applying to a surface, a controlled stream of a iiuid traveling at a high velocity which `is capable of effecting a cleansing or coating action.

Another object of the present invention is to provide an improved fluid valve means for controlling the ilow of fluid passing through a uid spray gun apparatus.

It is a still further object of the invention-to provide an improved uid spray gum capable of selectively mixing and discharging one or a plurality of fluids in acontrolled stream.

Other objects of the invention will be apparent from the detailed description and claims to follow.

The foregoing objects and other advantages of the present invention will be readily appreciated by reference to the following detailed description when considered in conjunction with the accompanying drawing showing the embodiment of the invention wherein:

Figure l is a side elevation view o-f a fluid spray gun embodying the present invention;

Figure 2 is a vertical sectional view of the spray gun shown in Figure l;

Figure 3 is a side elevation view of a reciprocating uid valve cylinder shown in Figure 2; VFigure 4 is a side elevation view of the fluid valve housing shown in Figure 2; Y

Figure 5 is a vertical sectional view partially in side elevation of a modified form of the present invention; and

Figure 6 is an exploded isometric view of the end cap, valve cylinder ho-using, and discharge barrel of Figure 5.

Generally, the fluid spray guns embodying the present invention, comprise a body section having a hand grip portion with inlet conduit means extending therethrough for conveying a compressed fluid, water, and a cleaning or antiseptic agent, respectively, either singly or in cornbination, outwardly through a barrel section and into a common discharge passage and nozzle, and a hand grip pressure actuated valve assembly whichcontrols the ilow of the propelling compressed uid 4through the balrel and discharge nozzle.

In Figures 1-4 of the drawing, the iluid mixing gun shown therein comprises a body section 10 having a rings 29.

and a cleaning or antiseptic agent, respectively.

ice

depending handle portion 11 which is divided longitudinally by partition members 12, 13 to provide three

conduit passages

14, 15, and 16 extending longitudinally therethrough which conduct a compressed iiuid, water, Integral with the lower end of the handle portion 11 is an adapter member 17 with

openings

18, 19, 20 extending therethrough which at their inner ends coincide with the end o'f the

passages

14, 15, and 16 extending through the handle portion 11. The adapter member 17 at the lower or outer end of the

openings

18, 19, and 20 therein, is threaded to provide means for `connecting uid supply conduits with the respective openings and

conduit passages

14, 15, and 16. The member 17 has on the upper surface thereof, a recess or notch 21 which retains and supports the lower end 22 of a valve actuating lever 23 consisting of `a iiat rod-like or bar member which conforms generally to the conguration of the handle portion 11 ofthe body section 10. The upper end of the valve actuating lever 23 is apertured as at 25 to facilitate operative engagement with the end of the reciprocating fluid valve cylinder 26 of the valve assembly 27 which is disposed in the body section 10 above the compressedV passage 15. The barrel section 28 also has a passage in v the lateral surface thereof which is adapted to be placed in alignment with the lateral opening 24 in the ring 29 and the water inlet passage 15 extending upwardly through the handle portion 11. A pair of sealing rings 30, 30' are positioned at opposite ends of the bushing A mixing chamber 31 is formed in the end of the barrel section V28, wherein lluid owing from the fluid valve means 27 entrains and propels Iwater outwardly through the barrel 28 and discharge nozzle 32. The axial discharge outlet of the uid valve means 27 is in axial alignment with the axis of a Venturi tube or ring 3 3 disposed in the barrel section 28 through which the compressed lluid from the valve means 27 passes at a relatively high rate of flow. The ring 33 is formed with an inwardly tapered mouth 34, a restrictedl throat 35, and an outwardly flared outlet 36 which has a maxi-` mum ldiameter at the forward end Substantially that of the barrel 28. The outer lateral surface of the Venturi tube or ring 33 at about the point of minimum diameter of the restricted throat 35 is provided with a ring-like recessed section 37 extending around the throat 35. The

recessed section 37 is in direct communication with the detergent or antiseptic inlet passage 16 extending through the handle portion 11. And, at a plurality of points about the periphery of the ring are several passages 38 extending through the wall -of the tube 33 into the interior of the said tube and through which detergent is drawn into the interior of the said tube when, for example, 4compressed air or a mixture of air and water ow through the throat 35 kof the tube 33, thereby mixing the detergent with air and/or water, carrying the cleansing Vmixture through the barrel 28,'and discharging the said mixture through the restricted outlet nozzle 32. A sealing ring-type gasket 39 is' fitted about the barrel 28 between the said-barrel and the inner surface of the body section 10.

The yfluid valve means 27 is comprised of a fluid valve housing section 48, the outside diameter of which is slightly less than the interior diameter of the end of the body Vsection 1t) so that the valve housing section 40 can be positioned in the end of the said body section 1l).

Vthe retaining ring 43 of the end closure cap which iixedly positions the valve housing 40 in the body section 10.

The lateral surface of the valve housing 40 intermediate lthe ends thereof has a groove 44 which extends about the housing 40 and which is in direct communication with the compressed uid inlet passage 14. At a plurality of points and preferably at 90 degree intervals, several passages 45 extend through the wall of the housing 40 into the axial passage of the said housing.

The forward end of the axial passage extending through the valve housing section 40 is restricted to provide a reduced diameter section 47 having a diameter only slightly larger than the outer diameter of the reciprocating valve cylinder 26 which is adapted to be slidably disposed therein. The large diameter section 48 of the axial passage has iitted in the end thereof, a bushing 49 the inner diameter of which is only very slightly larger than the outer diameter Vof the valve cylinder 26 which is reciprocable therein. from the rear of the valve housing 40 up to the edge of lateral passages 45, thereby forming a valve chamber 50 which is in direct communication with the compressed uid inlet passage 14. A sealing ring 46 is disposed in a groove in the housing 40 adjacent the end of the housing effectively preventing the leakage of iiuids.

The reciprocating cylinder 26 has an axial passage 51 'extending from a point intermediate the ends thereof forwardly to the discharge outlet 52 which is provided with a restricted nozzle S3 through which the iiuids dow. A plurality of passages 54 extend through the lateral surface of the cylinder 26 into the axial passage 51 adjacent the closed inner end thereof and said passages 54 are adapted to communicate with the compressed iuid inlet passage 14 when the reciprocating cylinder 26 is moved to the forwardly position and passages 54 enter valve chamber 50.

Sealing rings

55, 56, 57 are mounted in

grooves

58, 59, 60 on the cylinder 26 to eectively vprevent leakage of uids between the valve housing 40 and the reciprocating cylinder 26.

The end of the body section 10 is closed by end cap 61 which is secured to the body section 10 by a plurality of screws 62 and has a slotted section 63 in the lower portion thereof providing a passage in which the actuating lever 23 is reciprocable.

In the modified form of the invention shown in Figyures 5 and 6 of the drawing, the iluid mixing gun is comprised of a body section 70 having a depending handle portion 71 which is divided longitudinally by partition members 72, 73 to provide three conduit p assages 74, 75, and 76 extending longitudinally therethrough which conduct a compressed fluid, water and a cleaning or antiseptic agent, respectively. The lower end of the handle portion 71 has an enlarged section 77 with` fluid conduit adapter means 78, 79, and 80 formed therein which communicate with the passages 74, 75, and 76, respectively. The section 77 also has on the upper trailing surface thereof, `a recessed portion or notch 81 which pivotally retains and supports the lower end 82 of a manual valve actuating lever 83 consisting of a ilat rod-like or bar member which conforms generally to the configuration of the trailing edge of the handle portion 71 of the body section 70. The upper end 84 of the valve actuating lever 83 operatively engages the end of the reciprocating compressed fluid valve cylinder 86 of the valve means 87 which is disposed in the body section 70 above the fluid passage in the handle portion 71. The forward end of the valve means 87 abuts the rear of the barrel assembly 88 which is disposed in the body section 70 and which is retained therein by a retaining bolt assembly 85.

The bushing 49 extendsl i The barrel assembly 88 rotatably mounted in the forward end of the body section 70 is comprised of a tubular barrel member 88 with an integral bearing ring 89 mounted on the rear or inner end of barrel 88' and having the outer end of the barrel 88 gradually tapered inwardly to form on the end thereof =a small diameter discharge nozzle 90 and preferably having a secondary nozzle adapter means 91 formed thereon. Within the interior of the tubular barrel member 88 and disposed forwardly of the bearing ring 89 is a Venturi ring section 92 with a restricted throat portion 93. The barrel member 88 and the bearing ring 89 have lateral passages 94, 94' extending through the lateral walls thereof, with a diameter substantially that of the passage 76 and adapted to being disposed in unobstructed communication therewith in at least one of its rotatable positions. The transverse end surface 95 of the bearing ring 89 has an axial passage 96- extending therethrough which reciprocably receives the outlet end of the reciprocating compressedfluid valve cylinder 86. The end surface 95 also has extending therethrough, a concentrically disposed generally crescent shaped passage 9'7 radially spaced from the axial passage 96. A sealing ring 98 is positioned about the barrel 88 forwardly of the bearing ring 89 and preferably abutting the shoulder 99 of the body section 70, thereby preventing iluid leaking out around the barrel. The rear end of the barrel assembly 88 serves as a mixing chamber 100, wherein the compressed duid from the valve means 87 mixes with, entrains, and propels the water or the detergent outwardly through the barrel 88' and the discharge nozzle 90.

The valve means 87 is comprised of a fluid valve housing section 101 which is positioned within the body section 70 and which has an axial passage 101g extending longitudinally therethrough in -which the valve cylinder 86 is reciprocably disposed. The forwardly projecting small diameter end 103 of the valve housing section 101 is provided with a removable cylindrical valve ring 102 having an axial passage 102 extending therethrough. The section of the axial passage 102 which engages the end 103 of the housing is of larger diameter than the remainder of the passage and provides a shoulder 103 against which the cylindrical end 103 abuts. The said valve ring 102 also has a generally crescent shaped passage 108 which extends longitudinally from one side of the valve ring 102 parallel with the passage 102 and which is adapted to being placed in unobstructed communicationwith uid passage and passage 97 of the bearing ring 89. The valve ring 102 is restrained from rotating by means of two spaced stop members 104, 104' which project laterally from the cylindrical end 103 1and which are spaced about 90 apart so as to coact with vthe opposite ends of the crescent shaped passage 108 on the inner surface of the valve ring 102. The forward transverse surface 106 of the valve ring 102 preferably has secured thereto a sealing washer 107 which also has an axial passage and a crescent shaped passage extending therethrough.

The lateral surface of the valve housing 101 intermediate the ends thereof and rearwardly of the small diameter end 103, has a recessed section 111 formed therein preferably extending circumferentially about the housing 101 and being in direct communication with the compressed iluid inlet passage 74. At a plurality of points and preferably at degree intervals, several passages '112 extend through the lateral wall of the housing 101 into the large diameter section 113 of the axial passage 101:1 which extends through the said housing 101.

The forward end of the axial passage 101e extending through the valve housing section 101 is restricted to provide a reduced diameter section 114 having a diameter just sufficiently large to permit the forward section of the reciprocating valve cylinder 86 to be slidably disposed Bushing ring iis having an inner diameter which permits the valve cylinder 86 to reciprocate therein. The bushing 115 preferably extends from the rear of the valve housing 161 to about the lateral passages '112, thereby forming between the bushing 115 and the shoulder 115e of the housing 101, a circumferential valve chamber 116 which is in direct communication'with the air inlet passage 74. If desired, the bushing ring 115 could be omitted by enlarging the diameter of the rear section of the valve cylinder 86. Sealing rings 117, 118 are disposed in

grooves

119, 120, in the housing 101 on each side of recessed section 111.

The reciprocating fluid valve cylinder 86 with the larger diameter rearwardly extending section 86' has an axial passage 121 extending from a point intermediate the ends thereof forwardly to the discharge outlet 122 which is provided with a restricted nozzle 123 through which the compressed lluid flows. A'plurality of passages 134 extend through the lateral surface of the reciprocating cylinder 86 into the axial passage 121 adjacent the closed vinner end thereof. The said passages 124 are so positioned as to communicate with the valve chamber 116 `when the reciprocating cylinder 86 is moved forwardly :so that passages 124 enter valve chamber 116. Sealing .rings 125 and 126 are mounted in grooves on the cylinder 586 on each side of passages 124 to prevent leakage of Ithe compressed fluids between the valve housing 101 and :the reciprocating cylinder 86.

The rear section of the cylinder 86 is of largerdiame- 4ter than the forward section and is so. proportioned that the shoulder 129 thereon is disposed at about the rear of `the chamber 116 when the cylinder d6 is in its most rearwardly position. The compressed fluid pressure within the chamber 116 thus causes the valve cylinder 86 to normally remain in its rearwardly position and interrupting the flow of compressed fluid through passage 12d. Additional sealing rings 127, 128 are mounted in grooves on the forward section of the cylinder 86. The rear end of cylinder has provided on the lower surface thereof, a .slot 136 for receiving the upper end of actuating lever 84. And, mounted on the cylinder 86 forwardly of slot 13d is a stop ring 131 which abuts against the bushing ring 115 and which limits the forward movement of the cylinder 86 and prevents jamming the shoulder 115e of the valve cylinder 86 against the forward wall of valve chamber 116.

The valve means S7 is maintained in operating position ywithin the body section 70 by the end cap 11d which is secured to the body section 70. The cap 110 has projecting lugs 1119, 109 which engage grooves 10% in the rear end of the housing `101, thereby preventing the housing 101 rotating or moving rearwardly.

As a safety valve, the body section 7 0 of the spray gun, in the upper surface adjacent the rear end thereof, is provided with a generally cylindrical enlargement 140 with a small chamber 141 disposed therein directly over the compressed lluid recessed section 111 and in unobstructed communication therewith. Extending rearwardly from the chamber 141 is a small diameter passage 142 which connects with a cylindrical exhaust passage 143. At the end of passage 142 is a ball valve seat 144 for a ball valve 145 which is normally maintained in sealing engagement with the valve seat 144 by a spring 146. The spring 146 is maintained under compression by the end wall 147 of the end cap 11G. On the lateral sur- `face of the enlargement 140 positioned rearwardly of the :face thereof, into which a spring detent or ball 152 seats to position the barrel in one of its operating positions i in an olf position,-as desired. The spring detent 152 is ymaintained in operating position in the slot by a retaining bolt assembly 35 which is mounted in a threaded section 153 on the upper surface of the body section 70.

In the operation of the embodiment shown in Figures l-4, the threaded

openings

18, 19, and 20 of the body section of the spray gun are connected with an air, water, and detergent supply line,respectively. The air is supplied under a pressure of approximately 45 to l0() pounds per square inch and the water is at normal tap pressure. When it is desired to remove dirt and clean a surface, such as an animal cage, the operator applies pressure to the actuating lever 23 by firmly gripping the handle portion 11 of the body section, thereby moving the reciproeating cylinder 26 in a forwardlyv direction until the passages '54 are in substantial alignment with the air inlet passage 45 and the valve housing 4l) and providing unobstructed flow of air through inlet air passage `14 into the axial passage 51 of the reciprocating cylinder 26. The compressed air ows outwardly through restricted passage 53 into mixing chamber 31 where the air entrains vwater flowing upwardly through rWater inlet passage 15 into the Venturi tube or ring 33. The air and water mixture is carried outwardly through barrel 28 and discharge nozzle 32 and impinges with appreciable vforce upon the surface to be cleaned and wetted. During the foregoing operation, a valve in the detergent'supply line is normally closed. When it is desired to apply a detergent to the surface to be cleaned, the supply of water to the chamber 31 is interrupted by rotating barrel'ZS-until the lateral opening therein is no longer in alignment with inlet opening 24 in ring 29. lt should be understood, of course, that the water `supply can also be interrupted by providing a valve in the water inlet line. With the valve in the detergent supply line in the open position, the air valve actuating lever 23 is pressed forwardly allowing air to pass through the air valve means 27 into the reduced diameter or neck section 35 ofthe Venturi tube or ring 33 and outwardly through the barrel. When passing through the reduced diameter section 35 of the Venturi tube, there is a reduction in pressure created which draws detergent solution upwardly through the detergent conduit 16 and inwardly through the passages 3S into the interior of the Venturi tube. The air and detergent are thoroughly mixed while passing through the Venturi tube and forced outwardly through the barrel 28 and discharge nozzle 32. When sui-Heient detergent has been applied to the surface being cleaned, the valve in the detergent supply line is closed and the barrel 28 rotated to again align the water inlet passage with the water supply line so that by pressing actuating lever 23 forwardly the air is again admixed with water and the air-water mixture forced outwardly through the discharge nozzle, rinsing Way the debris and detergent solution to provide a clean surface. If desired, a disinfectant may be thereby introduced through the detergent supply line and applied to the cleaned surface in the same manner as the detergent was applied.

The modified form of the present invention as shown in Figures 5 and 6 of the drawing, operates on the same general principles and in the same general manner as the embodiment shown in Figures 1-4, and differs therefrom only in the detailed means of introducing the liquid fluids into the barrel assembly and in regulating the flow thereof. Thus, the compressed fluid, such as compressed air, flows through passage 74 into the passage l121 in the valve cylinder 86 when the actuating lever 83 is pressed forwardly. With the bearing ring 89 and the valve ring 162 having the crescent shaped

passages

97, 103, respectively, in the relative positions shown in Figure 6 of the drawing, the passage 75 is closed and the liquid, such as a detergent solution, in llu'id passage 76 is drawn into the mixing chamber 100' when `the compressed uid flows through the mixing chamber and'tlie mixture is discharged through the nozzle 90. When the barrel assembly 88 is rotated 90 degrees counterclock- ,wise so that the crescent shaped passage 97 in the bearing ring 89 coincides with the passage 108 in the stationary valve ring 102 the lateral passage 94 in the bearing ring is no longer in communication with the fluid passage 76 and the liquid, such as Water, in the passage 75, flows into the mixing chamber 100 and the mixture of air and water is discharged through the nozzle 90. If the barrel assembly is rotated 90 degrees in a clockwise direction, the flow through both the passages 75 and 76 is interrupted and only the compressed fluid is discharged when the actuating lever 83 is moved forwardly. In each of the foregoing operations, a spring detent means is provided to facilitate the proper positioning of the openings, although it is also possible to use the apparatus in intermediate positions other than the fully open or fully closed positions. With the apparatus of the present invention being used in the foregoing manner, the complete cleaning operation including the initial application of a strong detergent solution followed by rinsing with a stream of water being propelled by the compressed air and finally blowing the liquids away by air pressure alone can be most conveniently and effectively performed without using a plurality of different cleaning tools or highly cumbersome and complicated apparatus.

If desired, the handle portion 71 of the apparatus shown in Figure is provided with a cover member 160 which serves to insulate the handle in the event the apparatus is used with one or more heated iluids.

Others may readily adapt the invention for use under various conditions of service, by employing one or more of the novel features disclosed or equivalents thereof. As at present advised with respect to the apparent scope of our invention, we desire to claim the following subject matter.

We claim:

1. A lluid spray gun comprising a main body section having a depending handle portion and a barrel assembly with a discharge nozzle extending outwardly from said body section, said handle portion having a plurality of fluid passages comprising a compressed fluid passage, a first liquid fluid passage, and a second liquid fluid passage extending longitudinally therethrough, the said compressed fluid passage discharging into a valve means disposed in the said body section in axial alignment with the said barrel assembly, said valve means comprising a valve housing section having an axial passage extending therethrough and having in the outer surface intermediate the ends thereof a recessed portion which is in communication with the said compressed fluid passage and with the interior of the said axial passage, said valve housing having a fluid valve chamber between the ends of the said axial passage in communication with the said recessed portion of the valve housing, a valve cylinder reciprocably disposed in the said axial passage of the said valve housing having a transverse shoulder intermediate the ends thereof, said valve cylinder having an axial opening extending from the forward end rearwardly partially through said cylinder to a point rearwardly of the said valve chamber and being provided at a point rearwardly of the said valve chamber with at least one lateral passage extending from the surface thereof into said axial opening of the valve cylinder, said lateral passage being positioned so that the lateral passage is in communication with the said iluid valve chamber when the said valve cylinder is in its most forward position within the said valve housing and said lateral passage being out of communication with the said lluid valve chamber when the said valve cylinder is in its most rearwardly position, said shoulder of the valve cylinder being positioned to form at least a part of the rear wall of the said valve chamber, a manually `actuated lever engaging the said valve cylinder having a depending shank portion conforming to the general contour of the said handle portion, a fluids mixing chamber in said barrel assembly disposed forwardly of said iluid valve means adapted to being placed in communication with at least one of the liquid fluid passages, and said barrel assembly having a ring section with a restricted throat portion disposed in axial alignment with the said main body section forwardly of said fluid valve means and mixing chamber; whereby the liquid fluids drawn into the said mixing chamber are conveyed to the said discharge nozzle.

2. A lluid spray gun comprising a main body section having a depending handle portion and a rotatable barrel assembly with a discharge nozzle extending outwardly from said body section, said handle portion having a plurality of fluid passages including a compressed iluid passage, a first liquid duid passage, and a second liquid fluid passage extending longitudinally therethrough, the said compressed fluid passage discharging into a valve housing section non-rotatable disposed in said body section in axial alignment with the said barrel assembly, the said valve housing section having an axial passage extending longitudinally therethrough in which a compressed iluid valve cylinder is reciprocably disposed and being provided with passage means for conveying the compressed fluid into the interior of said valve cylinder and discharging the compressed fluid through an axial opening in the forward end thereof, said valve cylinder being actuated by a manual lever operatively engaging the said valve cylinder and a depending shank portion conforming generally to the contour of the said handle portion, said valve housing having a forwardly extending cylindrical end section with a cylindrical valve ring disposed thereon having a transverse end face, said ring having an axial passage in which the said valve cylinder is reciprocable and also having a second radially spaced passage extending longitudinally therethrough in communication with one of the liquid iluid passages, said rotatable barrel assembly having integrally afxed thereto at the rearwardly end thereof a bearing ring with a transverse end face thereon which is adapted to form a sealing engagement with the said transverse end face of the valve ring and which has an axial passage suitable for receiving the said valve cylinder, said bearing ring also having a radially spaced second passage adapted to being placed in conjunction with the said second spaced passage of the said valve ring, and said bearing ring also having a transverse passage extending through the lateral wall of the said bearing ring which is adapted to being placed in communication with the said second liquid fluid passage, the said second passage and the said transverse passage of the bearing ring being placed in and out of communication with the first and second liquid fluid passages, respectively, by rotation of the said barrel assembly.

3. A fluid spray gun comprising a main body section having a depending handle portion and a barrel assembly with a discharge nozzle extending outwardly from said body section, said handle portion having a plurality of passages extending therethrough for communicating with at least two sources of liquids and at least one source of compressed air and said passages adapted to delivering said liquids and compressed air at spaced points along the length of the main body section, a longitudinally reciprocable air valve means disposed in the body section for controlling the llow of air through the said passages conveying compressed air, said air valve means being controlled by a manually actuated lever having its upper end engaging the said longitudinally reciprocable valve means and a depending shank portion conforming to the general contour of the said handle portion, a fluids mixing chamber in said barrel assembly forwardly of said air valve means and in communication with the first of said liquid passages, a ring section with a restricted throat portion spaced forwardly of said air valve means and said fluids mixing chamber having at least one passage extending. through the walls ofthe throat portion which is in cemtained in closed position by the pressure of the fluids in` the said air passage and adapted to being moved to open l position upon manual pressure being applied to the said manually actuated lever.

4. In a spray gun `comprising a main body sectionv having a handle portion extending from the said body secgrants tion and a barrel assembly with a discharge nozzle exte'nd-l f housing section disposed in the main body section, said4 valve housing section having an axial passage extending therethrough with the forward portion thereof being of t smaller. diameter and having in the outer surface intermediate the ends thereof a recessed portion in communication with one of said passages adapted to being placed in communication with a source of compressed fluid,a valve cylinder reciprocably disposed in the axial passage of the said valve housing with the forward end thereof en-l gaging the smaller diameter portion ofthe said axial .passage and the inner end thereof reciprocably disposed inthe inner end of said housing, said valve housing having a Afluid valve chamber between the ends thereof with said chamber being in communication with the said recessed portion of the valve housing, said valve cylinder having an axial opening extending from the forward end rearwardly partially through said cylinder and provided at a point spaced rearwardly from the said forward end thereof withat least one lateral passage extending from the surface thereof into said axial opening of the valve cylinder, said lateral passage being positioned so that the lateral passage is in communication with the said valve chamber when the said valve cylinder is in a most forwardly position within the said valve housing and being out of communication with the said valve chamber when the said valve cylinder is in a most rearwardly position.

5. In a spray gun comprising a main body section having a handle portion extending downwardly from the said body section and a barrel assembly with a discharge nozzle extending outwardly from the said body section having a plurality of passage means for conveying a plurality of fluids to the main body section with at least one of said passage means adapted to conveying a compressed fluid; an improved compressed fluid valve means comprising a valve housing section disposed in the main body section in axial alignment with said barrel section, said valve housing having an axial passage extending longitudinally therethrough and having intermediate the ends thereof a transverse passage extending through the wall of the said housing in communication with a passage conveying compressed fluid, a compressed fluid valve cylinder reciprocably disposed in the said axial passage with the rearwardly extending section thereof having a larger diameter than the forwardly extending small diameter section, a valve chamber formed between the lateral surface of the small diameter section of the valve cylinder and the section of the valve housing having the said transverse passage etxending therethrough, the said chamber having as at least a portion of the rear wall thereof a transverse sage extending through the wall f the iilv cylinder, said lateral passage being disposed so that the lateral passage is in communication with the said valve chamber when the valve cylinder is moved to a forwardly position withinthe said valve housing and is outof communication with the said valve chamber when the said valve cylinder is in its normal rearwardly position.

6. In ya spray gun comprising a main body section.:Vv having a handle portion extending downwardly from ythe said body section and a barrel' assembly with a discharge-- nozzle extending outwardly from thelsaid body section- ,y having a plurality of passage means for conveyingI a plu--v rality offluids to the main bodyfsection with atleast onel of said passage means adapted to conveying a compressed,` fluid and atleast two of said kpassage means adapted to conveying a liquid fluid, land said barrel section being ro` tatable in said body section to control the flow of said.

y liquid fluids through the said gun; an improved liquid fluid".

the compressed fluid into the interior of said valve means.

and discharging the said compressed fluidthrough an axial opening in the forward end thereof, said lvalve housing having the forwardly extending section thereof in the form of a small diameter end section on which is disposedv a cylindrical valve ring with aftransverse lend face, said Y valve ring having an axial passage in whichthe forward` section of the said valve cylinder is reciprocable and also having a second radially spaced passage extending longitudinally therethrough in communication with one of theV liquid fluid passages, said rotatable barrel assembly having integrally associated therewith4 at the rearwardly end s thereof a rotatable bearing ring with a transverse end face which is adapted to form a sealing engagement with the said transverse face of the said valve ring and which has an axial passage suitable for conveying the compressed fluid, said bearing ring also having a radially spaced second passage adapted to being placed in conjunction with the said radially spaced passage in the said valve ring,

n andsaid bearing ring also having a transverse passage exwall section of the valve cylinder providing a surface y* tending through the lateral wallof said bearing ring *which` is adapted to being placed in communication with another liquid fluid passage; whereby the said second passage and said transverse passage in the said bearing ring are placed inV and out of communication with the said liquid fluid passages, respectively, by rotationV of the said barrel assembly.

7. In a spray gun comprising a main body section having a handle portion and a barrel assembly rotatably disposed on said body section with'a discharge nozzle extending outwardly therefrom and having a plurality of passage means for lconveying a plurality ofv fluids to the main lbody section with one of said passage means adapted to conveying a compressed fluid and at least one of said'v passage means adapted to conveying a liquid fluid; and

improved liquid fluid valve means comprising a fluid valve housing non-rotatably disposed in the main body section in axial alignment with the said rotatable barrel assembly, said valve housing having an axial passage means through which the compressed fluid flows into the barrel assembly, said valve housing having the forwardly ex-v tending section thereof in the form of a cylindrical valve ring with a transverse end face, said valve ring having a second passage spaced radially from the axial passage therethrough adapted to communicate with, one said liquid fluid passage means, said rotatable barrel assembly having integrally associated therewith at the rearwardly endk thereof a rotatable bearing ring with a transverse end face which is adapted to form a sealing engagement with the said transverse face of the valve ring, said bearing ring also having a second passage extending therethrough