US2602004A - Spray gun - Google Patents

Description

y 1, 2 F. F. FAKTOR ,0 4

SPRAY GUN Filed Oct. 8, 1948 2 SHEETSSHEET 1 R. E'Q WZI 1 1507'- July 1, 1952 F. F. FAKTOR SPRAY GUN 2 SHEETS-SHEET 2 Filed Oct. 8, 1948 INVENTOR. .F'ra 77112711277 for flamdam Patented July 1, 1952 UNITED STATES PATENT OFFIE- 2,602,004 sPitAY GUN Frank- Frantisek Faktor, flounslow, England Application October 8, 194s',- Serial No; 53,501 Claims; 01. 209-s9 This invention relates to spraying devices, and the like, and more particularly to a-liquid sprayer ors'pray' un.

The main object" of my invention isto equip a spray gun with facilities for readily inter changing either of a pair of nozzles capable of producing wide ranges of atomization from very fine mist to a sprinkling effect by the useof a wide range of-air' pressures;

Another object is to include'means for chang ing the ratio between the atomizing pressur'eand the material feed pressure on the spraying fluid to pes rayed by the gun.

A furtherobject is to" provide means for efiecting quickrelease of the operatinglever or trigger mechanism to facilitate instantaneous dismantling of the's'ame It is also an object to provide-a spray gunof the indicated character with a removable unit i'x'icluding' a nozzle; a: gland and needle valve guide norinally retained in position at the-front of the gun hyreleasabl'e means.

A practical object" is' of course-to have aspray gun as indicated which is reasonably simple and rugged in construction and is not likely to get out ofiorder I ther objects and advantages ofthe' inven on w'ill a-ppear" greater detail as the speci fication'proceeds.

order to facilitate ready comprehension of this invention fora proper appreciation of the salient features thereof,- the invention is illustratedon the" accompanying drawingsforming part hereof, and in which:

Figure 1 is a side elevation of a spray gun made according to the invention and embodying the same in a practical form;- the view heing'partly vertical section to disclose constructional dc tails;- V H Figure 2' is a transverse section takenon line 22'in-Figure 1-';-

Figure 3 is another inFigur'e 1';

Figure- 4- is a plan view of the spray gun of Figure l with a portion in horizontal section to disclose internal details ;;1

' Figure 5' is ase'ction of the'forwardportion of amodification of the'gu'n;

Figure 6 is" a side elevation of another modific'ation of the guri, showing the spraying fluid container integral with and mountedabove the latter. V

Referringindetail to the drawings;- andin particular to Figures- 1't'o*4=thereof, a spray-gun;

section ta'k'en' on line 3-4 generally designated 1, comprises at gun" casingTB 2 having three main portions formed integral; con s'isting of the gun barrel 9, the piston grip or handle Ill, and the cap or cover II. The cover portion II is threaded to receive the upper end or neck I2 of a container 13 adapted to contain a fluid to be sprayed, the neck 12 having threads 14' engaging the internally threaded portion I35 of the cap; Engaging the upper end of neck 12 of container I3 is a disk 15 of resilient material clamped between the upper part I! of cap I l and the upper end of container neck l2 to form a tight closure for the latter; the disk l3 having a centralaperture I 8 communicating with apassage [9' in the .gun'harrel 9 and opening into a large horizontal passage 20 therein which extends downwardly through the handle 10-, as indicated at 2|, the lower end of the hollow handle l0 being provided with aninternally threaded opening 23 into which a nipple or connection (not shown) may be screwed for connecting the gun to an air pressure hose in order to' supply the requisite air for propelling the fluid in conta-iner l30ut of'the gun during spraying. Upon the back-ofthe handle [0 is-an upper finger stop 24 and below it is a locating projection 25, while onthe front ofthe handle is a longer intermediateprojection 26,- the arrangementbeingsuch that when the handis placed upon thehandle l0 hetwe'en the finger stops or locating projections 24' and 25, the second finger wil-l-enga'ge beneatli the intermediate stop 26' for apurposewhich will presently appear.

Depending within the container I3 is an outlet tube or pipe 21 terminating atlts lower endin aforwardly bent extremity 28' adjacent to the bottom 29 of the container", and having a threaded upper end 30screwed'into the'lower end of a vertical hore- 3| the gun barrel 9; with a lock-nut-32 on the end- 30 engaging the underside-of a metal disk 33' whereby the inner periphery of the-resilient rubber or other material disk I6 is clamped; against the top I! of cap H; In disk 33 is an aperture 34 through which theai-r from the hollow handle and passages- 20, IQ-passes down intothe container in order to exertdriving spraying pressure' upon the fluid withinthe latter. Within the-gun barrel 9 screwed: the.

threaded rear end 35 of a forwardly-directed nozzle 36 having a-- central bore 3'! which" isahoutthe rear-portion or-the nozzle for a purpo'se about to be described. The bore 37 within the nozzle 36 communicates with the vertical bore 3| in the gun barrel 9 so that the fluid within container 13, which is driven up by air pressure through tube 21 and into said bore 3i, will be propelled through bore 31 toward the forward small aperture'39 and out through the latter. In order to govern the amount of fluid thus ejected from thespraying aperture 39, a long rod 42 formingla needle valve and ofsmaller diameter than bore 31' extends axially through the latter and at the forward end terminates in a tapered valve point 43 cooperating with the internal forward tapered portion 38 of bore 31 and aperture 39, so that rearward axial movement of rod 42 or needle valve will open communication between the bore 3! and spraying aperture 33110 a greater or lesser extent according to the distance needle valve 42 is moved rearwardly.

The needle valve 42 extends rearwardly across thei'bore 3i and slides through a hole in the vertical rear wall 44 in gun barrel 9 separating the bore 3| from the air passage 20. A washer or collar 45 is removably fixedonneedle valve 42 by suitable means to engage the wall 44, while upon the rear portion of valve rod 42 within the passage 29 is circumposed a coil spring 46 bearlug-against collar 45 at its forward end and bearing rearwardly against the forward end of a plu 41 screwed into the rear endi49 of the gun casing 8. The needle valve 42 extends slidably through the plug 41 and terminates at its rear end in a threaded extremity48. Normally spring 46, by hearing against the collar 45 fixed on the needle valve rod 42, holds the tapered needle point or tip 43 thereof in closing relation to the aperture 39 in nozzle 36. 2

Threaded on the rear end 48 of the rod 42 is an adjustable stop nut' 56 positioned to be engaged by an operating member hereinafter described, in a manner to move the needle valve rod 42 rearwardly and enable air and fluid from container l3 to be sprayed through aperture 39. The operating member comprises a transverse pin 5] extending through casing 8 above passage 29 andterminating at opposite sides of the casin in reduced ends, 52, upon which are pivoted the depending triggers 53 whose lower ends 54 are joined to form a yoke located above the forward handle projection 26 and bent slightly forwardly to accommodate the first finger when the second finger of the hand engages beneath. the projection 26 on handle ID. A short distance below the pivot pin ii the triggersf53 are pivoted at 56 to the forward ends of the legs 59, 59 of a U- shaped spring 69. The legs 59 are joined at their rear ends by a transverse yoke portion 92' normally resting upon the needle valve rod 42 rearwardly of the plug or nut 41 and immediately in frontof the adjustable stop nut 56. The stop nut 50 is provided at the forward end thereof with a flange 63 against which the rearend or yoke62 of the U-shaped spring 69 is adapted to engage when the triggers 53 are moved rearwardly about their pivotal mountings 52, while upon a portion of flange :63 of .nut 50 anintegral for-wardprojection 64overhangs the rearyoke portion 62 of the spring 66, in order to prevent the latter from being accidentally displaced from its position in front of flange 63 whileresting on rod42..

- Thearrangementiis such that when thehand grips handle I6 with-the .palm located substantiallybetween. the locating projections 24and 251 and the-first finger engaging thefront' of the 4 triggers 53 and the other three fingers located upon the handle below the forward stop or projection 26, rearward movement of triggers 54 by the first finger will cause said triggers to swing upon their pivot mountings 52 and thereby move arms 59 of yoke member rearwardly so that the transverse yoke portion 62 thereof will enage against flange 63 of adjustable stop nut 59 and thereby push needle valve rod 42 rearwardly and withdraw the forward tapered needle point 43 thereof from actual contact with the interior of spraying aperture 39 thereby allowing compressed air from the hollow handle I0 to pass through passages l9, l1 and 34 into container I3 to force the fluid in the latter up through tube 21 and into bore 3|, and thence through bore 31 and out through orifice 39 past the tapered forward end 43 of the mentioned needle valve rod 42. Adjustment of the stop nut 56 determines and limits the rearward movement of the needle valve rod 42, againstthe resistance of the spring 46 when the triggers 53 are compressed toward the handle l0. As soon as the triggers 53 are released, spring 46 returns the needle valve rod forwardly to close the orifice 39. The plug 41 is fixed in position by means of apin extending-downwardly through the rear end 49 of easing 8. g

As thus far described, the apparatus serves to project a small stream offiuid from container I3 out through orifice 39 without, however; atomizing the same in the true sense. For this purpose the gun barrel 9 is provided with additional equipment surrounding the nozzle 36. The nozzle 36 is provided with a plurality of radially extending fins 66, best seen in Figure 2, defining air passages 61 therebetween, and upon the fins is slidably mounted a hollow nozzle 81 provided with a concave forward end BBVand an aperture 69 closely surrounding the conical exterior 40 of fluid-ejecting nozzle 36. Upon. the. rear portion of air nozzle 81 is a wide rim or flange 10 loosely surrounded by a retaining ring 'll having on its forward end an inwardly directedfiange '12 en-. gaging against, the forward inclined shoulder 13 of the mentioned flange 10 to form a substantially air-tight connection at that point. The rear end I4 of the retaining ring H is reinforced in thickness and externally knurled and fits slidably upon the forwardly-projecting cylindrical end of gunbarrel 9, and a retainingrscrew I5 extends through a diagonal slot 16 in the knurled end 1'4 of retaining ring H and is screwed into gun barrel portion 4l,:as best seenin Figure 4; When retaining ring 14 is rotated in a clockwise direction, that is, upwardly-in Figure 4, the screw 15 being slightlyloosened to allow free rotation, the lower portion of slot 16 engaging thescrew will cause the retainer ring and the air nozzle 81 carried thereby to be shifted a short distance forwardly, thereby moving aperturej69 forwardly away from the conical tip 46 of fluid nozzle 36. Rotation of the ring H in the opposite direction brings the upper end of slot 16 into contact with screw 15 and moves the retaining ring II and its rear reinforced portion l4 rearwardly thereby causes the, aperture 69 ofthe air nozzle 81 to be brought close to the tapered'tip ,40 of the fluid nozzle 36, thereby restricting the opening'thereof and obviously allowing less air and fluid to issue between the orifice 39 andthe tapered tip 49 of the fluid nozzle 36.

A pair of passages 19, 19 in the sides of the gun barrel 9 by-pass the vertical bore 3|, from whichthe tube 21:project s downwardly into the container 13, and connect the forward end of the air passage 20 with the rear end of chamber 18' in the forward end of the barrel 9, whereby compressed air is supplied to the passages 61. Within the chamber 18 is located a slidably movable washer 80 movable in the space between the forward end of the tubular cylindrical gun barrel portion 45 and the rear end of air nozzle 81. A relatively weak expanding spring 8| in chamber 7 8 is compressed between the washer 89 and the rear end of chamber (8 and normally acts to hold the washer 80 against the'rear end HI of the mentioned air nozzle 8! so as to close the rear ends of a pair of longitudinal passages 22, 82 formed in the nozzle 61, the forward ends of thepassages 82 opening into the concave forward end '68 of the air nozzle at 83, 83. Normally, the air pressure present in chamber 73 tends to push the air nozzle 61 forwardly as far as the flange 12 of the retaining ring H will allow it to go, so that the engagement of this flange with shoulder I3 on the air nozzle will determine the position of the latter in the retaining ring. Due to the presence of the spaces 6? and the intermediate reduced portion 84 of inner nozzle 36, the air pressure exerts only a partial pressure on the rear of washer 86 tending to hold the washer 80 in closing relation to the passages 82 in the wall of air nozzle 8! in addition to the light pressure exerted by the spring 8 i, inasmuch as the air passes also through the opening of the washer 80 and around the reduced portion 84 of the inner nozzle 36.

Upon occasion it maybe desired to use a substantially flat spray instead of the usual round or cone-shaped spray. On such occasion it is necessary to remove from the gun the washer 80, within retaining ring H, in the rear of the air nozzle 81, so that the compressed air within chamber 18 will then enter through passages 82 and issue through forward orifices 63, 83, thereby exerting air pressure from above and below upon the mist atomized by the air from orifice 69 upon fluid issuing from orifice 39. The

air nozzle 87 can be rotated to give the fan spray in any direction desired, other than the position. shown.

In order to replace nozzle 36 by another of somewhat diiferent character and capable of handling fluid of different viscosity, the screw 75 is merely unscrewed, and retaining ring H slid forwardly ofi the forwardly-projecting cylindrical portion 4! of gun barrel 9, the air nozzle 81. and washer 86 readily following the retaining ring in its removal so that nozzle 36 then projeets in exposed condition from the cylindrical portion 4|, fully accessible for unscrewing its rear end 19 from the gun barrel 6, and temporarily removing spring 8 l. The replacement nozzle is then screwed into place, after which the spring 8|, washer 89 and air nozzle 81 are replaced, and finallythe retaining ring H. When sliding retaining ring H into position on the hollow cylindrical portion 4|, the knurled rear portion 14 is adjusted to present the slot 75 in proper position on top. The screw 15 is then screwed down into the cylindrical portion 4! and the nozzle is fully assembled.

While the inner nozzle 36 has been described ashaving an inner threaded end 19 which is screwed into gun :barrel 9, it is also possible to have a somewhat similar nozzle 86 provided, as shown in Figure 5, with a hollow cylindrical rear end88 fitting into 'a central bore 89- of a gun barrel 90, the nozzle having a flange 9| forming a stop to locate the rear end 88 in the bore 89'. 1 A knurled set screw 92 is screwed down through a threaded hole 93 in the gun barrel with its lower end ti l-engaged with the rear portion 88 of nozzle 86 to retain the latter in place. Unscrewing the set screw 92 a few turns will release the nozzle 86 so that it can be slid forwardly out of the gun barrel 90. In the upper portion I! of the cap H is screwed the threaded upper end 30 of the pipe 2! to communicate with a bore 95 in the rear portion 88 of the noz-- zle 86, and with a longitudinal bore 96 of larger diameter than-the needle valve 42 and extending therethrough. In the rear portion86 of the nozzle 86 is screwed a gland plug 97 slidably surrounding the'needle valve 42 and containing a gland packing'96 to prevent any of the fluid forced up through pipe 21 and bore 95 from escaping rearwardly into the air supply passage 99 of the spray gun, while allowing needle valve 42 to slide sufiiciently to control by its forward conical end or tip 43' the small central orifice I06 of nozzle 86, in a manner already described in connection with the nozzle 36 of Figures 1 to 4.

Upon the nozzle 86 are provided fins HH, l0! similar to fins 66 of the nozzle 36,- while the forwardly projecting hollow cylindrical portion 162 of the gun barrel 99 has the retaining ringv ii thereon with its air nozzle 8'1 and contains a but necessary to remove said screw and release set screw 92 partially, when it will be possible to slide out both the inner nozzle 36, as well as the air nozzle 81, and also the retaining ring H for quick disassembly to facilitate cleaning of the parts. The gun barrel 90 has a bleeder p'assage H6 leading to the outside from the hole receiving rear end 88 of the inner nozzle 86 to allow any leakage tending to pass this nozzle to escape instead through passage I I6.

' Reverting now to theapparatus as shown in Figures 1 to 4, it may be mentioned that the trigger mechanism would, of course, be applied in exactly the samemanner to the device of Figure 5 when complete, and this mechanism also lends itself to quick and easy dismantling. When it is desired to remove the needle valve 42 and otherwise dismantle either device, the device being disconnected from the air hose and free from any air pressure, the handle H) is held in one hand and theother hand is used to move the nut 50 rearwardly a sufficient distance to allow the U-shaped spring 60 to be swung upwardly clear of the forwardly overhanging projection 64 of nut 50. When the spring 60 has been swung above the projection 64, one of the legs 59 is expanded laterally outwardly, as indicated in broken lines at I04 in Figure 4, so as to free it from pivot stud 56 upon which it was pivoted. In similar fashion, the other leg 59 is withdrawn outwardly, as indicated at I05, fromthe other pivot stud on that side, and the spring 60 removed. The triggers 53 can then be lifted off the pivot ends 52 and laid aside. Upon unscrewing cap H from the upper end I2 of container l3, access is provided to reach the washer 45 on the needle valve 42 through the passage Hi to withdraw the pin orother means used to hold the washer.- 45 rigidly on: the needle valve rod after which the rod can be withdrawn rearwardly through the plug 41. Such complete dismantling of the gun may not be necessary, since only the nozzles, retaining ring H, spring 8|, and washer 80 are ordinarily removed for cleaning. Normally, even if the retaining ring and the nozzles are removed either as shown and described with respect to the form of. the invention of Figures 1 to 4, or as shown in Figure 5,, the triggers and U-shaped spring 60 may be removed, while the needle valve rod 42 remains assembled with the gun casing 8.

In the form of the invention shown in Figure 6, the fluid container is integral at )8 with the upper portion of the gun barrel [96. The hollow handle I09 is provided with a compressed air supply fed to its interior chamber H which communicates through a tube Hi in the upper portion thereof with the upper portion of the interior H2 of container I08. The chamber H2 within the container communicates with a downwardly-extending passage H3 communicating with the needle valve bore H4 within gun barrel I01. The upper end H4 of container I03 is closed by a screw cap H5, removal of which allows introduction of whatever fluid is intended to be sprayed from the gun. Otherwise the COD-.- struction of the spray gun of Figure 6 is the same as those of Figures 1 to 4 or Figure 6.

Manifestly, other variations than those described may be resorted to and parts and features may he further modified or used without others within the scope of the appended claims.

Having now fully described my invention, I

claim:

1. In a spray gun, a gun casing having an upward fluid passage therein, a tube connected to a source of supply of fluid to be sprayed and communicating with the upward fluid passage in the gun casing, and means communicating with a source of compressed air for applying air pressure to the fluid, a forwardly-directed hollow cylindrical gun portion projecting rigidly from the gun casing, the latter having a forwardly-directed opening within the hollow cylindrical gun portion communicating with said upward fluid passage, a fluid-ejecting nozzle detachably mounted in said opening and arranged to project forwardly out of said hollow cylindrical gun portion and having a longitudinally-disposed fluid passage communicating at the inner end thereof with said upward fluid passage, an externally and internally-tapered outer end on said nozzle having a small orifice communicating with the longitudinal fluid passage within the nozzle, a needle valve rod of smaller diameter than that of said longitudinal fluid passage extending through said nozzle and terminating in a tapered needle valve point with the internallytapered outer end thereof, a spring in said gun casing biasing the needle valve rod with its tapered needle valve point into closing contact with said internally-tapered outer end, manually-operated means mounted upon said gun casing in effective position to move said needle valve rod longitudinally in opposition to said spring and thereby withdraw the tapered needle valve point of said needle valve rod from said internallytapered outer end in said nozzle to allow ejection of fluid through the small orifice in the outer end thereof, a diametrically-enlarged portion on said nozzle within the outer end thereof having at least one passage extending longitudinally therein for passing compressed air from within said hollow cylindrical gun portion to the externally-tapered end of said nozzle, said hollow cylindrical gun portion having at least one passage leading from the source of compressed air to the interior of said hollow cylindrical gun portion, means retaining said fluid ejecting nozzle in place within the opening in the hollow cylindrical gun portion, a gland member mounted upon the needle valve rod and screwed into the inner end of the longitudinal passage in said fluid-ejecting nozzle, a tubular retaining ring rotatably mounted on the hollow cylindrical gun portion and extending beyond the forward end thereof, a hollow air nozzle slidably mounted on the diametrically-enlarged portion on the fluidejecting nozzle having a rear end extending rearwardly into the tubular retaining ring and formed at its forward end with an orifice surrounding the externally-tapered outer end of said fluid-ejecting nozzle, and means connecting sad hollow air nozzle with the outer or forward end of said tubular retaining ring in such manner that upon partial rotation of the ring in either direction, the hollow air nozzle is longitudinally adjusted with reference to the fluidejecting nozzle and presents a greater or smaller opening between the externally-tapered outer end of the latter and the orifice in the outer end of said hollow air nozzle according to the direction in which said retaining ring is rotated.

2. In a spray gun comprising a hollow gun oasing having a container for fluid to be sprayed detachably connected thereto, the features which include a gun portion integral upon the gun casing with a hollow cylindrical portion extending forwardly therefrom and having a downwardlyextending passage therein, a container cover integral with the gun casing, a pendently-disposed tube extending with its upper end into the downwardly-extending passage and adapted to extend with its lower end into the container for spraying fluid when the latter is connected to the container cover, a rear end portion upon said gun casing having a rear hole therein, a downwardly and rearwardly-extending hollow handle integral with the gun casing, the latter and the handle having an internal chamber opening through the lower end of said handle, the latter end of said handle being adapted to be connected to a source of compressed air, and the gun casing having a passage leading to the interior of the container cover from the internal chamher in said gun casing and handle, a forwardlydirected opening within said hollow cylindrical gun portion communicating with the downwardly-extending passage therein, a fluid-ejecting nozzle having one end detachably mounted in the forwardly-directed opening and extending forwardly from said hollow cylindrical gun portion, the nozzle having a longitudinal passage therethrough and terminating at the forward end in a restricted fluid-ejecting orifice, a wall in said gun casing separating the downward passage in the hollow cylindrical gun portion thereof from the internal chamber therein and having a hole aligned with the rear hole and the longitudinal passage in said nozzle, an axially-movable needle valve rod extending from within the latter longitudinal passage through the two holes and terminating rearwardly exteriorly of the rear end portion of said gun casing in an exposed operating end, a stop projection mounted upon the latter end, an air nozzle supported upon the forward end of said hollow cylindrical gun portion in effective position to atomize fluid ejected from said fluid-ejecting a pair of pivot members supported on the opposite sides of said gun casing, a pair of triggers having pivot apertures in one end of each fitting upon said pivot members and extending down ward in spaced relation to said handle, a U- shaped spring having a rear yoke portion resting upon the rear exposed operating end of said needle valve rod within and forwardly of the stop projection thereon, and two substantially parallel arms projecting forwardly and individually terminating in forward ends upon the intermediate portions of said triggers, and a pair of pivot members pivotally connecting the forward ends of said two parallel arms of said U- shaped member with the intermediate portions of said triggers.

3. In a spray gun comprising a gun casing with a forwardly-projecting hollow cylindrical gun portion, and a rearwardly-disposed handle rigid with said gun casing, the features which include nozzle means supported upon the hollow cylindrical gun portion for ejecting atomized fluid therefrom, the handle and gun casing having an internal chamber opening through the end of the handle and the latter end being adapted to be connected to a source of compressed air, a hollow fluid container integral with said gun casing upon the upper portion thereof and having an upwardly-directed opening, a removable cover for closing the opening in the fluid container, the gun casing having a passage interconnecting the hollow interior of said fluid container and the interior of the hollow cylindrical gun portion to bring fluid to said nozzle means, the gun casing also having a second passage communicating with the internal chamber in the latter and said handle and extending to said hollow interior of said fluid container, an air tube fixed in the second passage and extending upwardly within said container and terminating below the opening thereof, a movable valve member controlling ejection of fluid from said nozzle means to the atmosphere, and manually-operated means mounted on said gun casing for operating said movable valve member at will.

4. A spray gun comprising a casing having a forwardly projecting tubular cylindrical barrel, a fluid spray nozzle mounted on said casing within and concentrically spaced from said barrel, said fluid nozzle having a. forward end projecting forwardly beyond said barrel, said fluid nozzle being formed with an axial bore and terminating at its forward end in an internally and externally tapered tip forming an orifice communicating with and smaller in diameter than said bore, an air nozzle comprising a tube concentrically slidable on said fluid nozzle and extending beyond said tip, said tube having a. wall at its forward end formed with a circular opening smaller in diameter than said tip and into which said tip projects in concentrically spaced relation to the edge of said opening, means for holding said air nozzle in longitudinally adjusted relation to said fluid nozzle, a needle valve mounted on said casing andxextending through said fluid nozzle bore in "concentrically spaced relation thereto and having "a; tapered forward end positioned to cooperate with said orifice to determine the effective'aperture of said orifice, means for supplying spray fluid under pressure to said orifice through said fluid nozzle bore, said needle valve. .being longitudinally movable in said fluid nozzle to selectively determine the effective aperture of said orifice, meansfor supplyingair under pressureto' the space between said nozzle and the interior of said tubular barrel, and operating means connected between said casing and said needle valve for moving said needle valve longitudinally in said fluid nozzle, said air nozzle being formed with spaced longitudinal air passages opening through the forward end thereof in positions to form a flat jet of spray emerging from said orifice, the rearward ends of said longitudinal air passages opening through the rear end of said air nozzle into the interior of said tubular barrel portion, and spring biased means within said tubular barrel portion normally closing the rearward ends of said longitudinal air passages.

5. A spray gun comprising a hollow casing terminating at its forward end in a cylindrical tubular barrel portion, a wall across the interior of said casing at the rearward end of said tubular barrel portion, a compressed air passage in said casing terminating at its forward end at said wall and having means for connection to a source of compressed air, a spray fluid container, means on said casing closing said container and mounting said container thereon, an air conduit in said casing leading from said air passage into the interior of said container whereby compressed air from said air passage is impinged upon spray fluid present in said container, said wall being formed with an internal chamber, a tube extending into said container and communicating with said chamber whereby fluid ex-' pelled from said container by compressed air enters said chamber under pressure, said chamber having a forwardly facing opening concentric with and opening into the interior of said tubular barrel portion, a forwardly projecting fluid nozzle having a rear end mounted in said chamber opening and a forward end reaching forwardly beyond said tubular barrel portion, said nozzle having a longitudinal bore communicating with the interior of said chamber and a reduced hollow conical forward end tapering to an interior diameter smaller than said bore and defining an orifice, a needle valve supported in concentrically spaced manner in said bore for axial movement therein, said needle valve terminating at its forward end in a tapered tip cooperating with said orifice, means for moving said needle valve forwardly and rearwardly in said bore to reduce and enlarge the eifective area of said orifice, a tubular air nozzle concentrically and slidably mounted on said fluid nozzle and terminating at its forward end in a concavity and a wall behind said concavity formed with a circular opening concentrically spaced from said tapered forward end of said air nozzle and into which said tapered forward end projects, a ring slidably circumposed upon said tubular barrel portion and retainably engaging a portion of said tubular air nozzle, and releasable retaining means operating between said ring and said tubular barrel portion and holding said ring in a selected longitudinal position on said tubular barrel portion determining the degree of projection of said tapered forward end of said fluid nozzle in said circular opening of said air nozzle.

FRANK FRANTISEK FAKTOR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Number 10 Number Name Date Kollmann Oct. 7, 1930 Breuer July 26, 1932 Downs Sept. 13-, 1932 Tracy Nov. 15, 1932 Larson May 2, 1933 Downs June 25', 1935 Fisher May 11, 193"! FOREIGN PATENTS U Country Date France June 26, 1931 France .1 Feb. 7, 1938

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