US1907031A - Spray gun - Google Patents

Description

May 2, 1933 s. F. ANDERSON S PRAY GUN Filed OCL. 29, 1928 2 Sheets-Sheet l May 2, 1933 s. F. ANDERSON 907y031 SPRAY GUN Filed Oct. 29, 1928 2 Sheets-Sheet 2 Patented May 2, 1933 narran s'rArsts rarest eiseres SWAN It". ANDERSON, OF ROCKFORD, ILLINOIS, ASSIGNOR TO EDITH MARIE ANDERSON, OF ROCKFORD, ILLINOIS SPRAY GUN" Application filed ctober 29, 1928. Serial No. 315,669.

This invention relates to a spray gun or turning thereof to retighten the same. It air brush :tor spraying the usual variety of is, therefore, still another important object of liquid orsemi-liquid materials, such as paints, my invention to provide a rotary valve intillers, enamels, varnishes, shellacs, stains7 side the air nozzle Which is operable Yfrom the 5 @te outside and Without necessitating any t-am- '55 Spray gun manufacturers have heretofore pering With the air nozzle Whatever to change been compelled to make various models to from a round to a flat spray, or vice versa. suit the different individual preferences of A special feature of this auxiliary valve lies Workmen accustomed to handling their guns in the fact that it is assembled Within and ii) differently. A spray gun preferred by one forms a unitary part of the air nozzle and eo Workman because of certain characteristics is, therefore, removable and replaceable with Would not meet With the approval of another said nozzle, thus making it unnecessary to Workman, and vice versa. This naturally handle eXtra parts. made it a dii'iicult proposition to merchan- Still other features of my invention, such l? dise and stock these devices, and it has been as the provision ot' an air restriction valve B5 generally recognized that there is a demand 'for cutting down the volume of air to the for a spray gun more adaptable to ditlerent amount required, and the provision of a individual preferences as Well as more adaptneedle valve in connection With the color able to different Working conditions. lt is nozzle, which is so mounted that it may be iii) the principal object of my invention to proturned in addition to being reciprocated, so '7o vide a spray gun Which is practically unias to permit grinding in of the color nozzle versally adaptable by virtue of certain addischarge orilice Whenever desired, Will be justable parts provided thereon. More spefully described in the following specificacilically stated, the spray gun of my invention in which reference is made to the drawi3 tion has svvingable goose-necks for the paint ings, Wherein- 75 and air hose connections mounted on oppo- Figure l is a side view of a spray gun site sides of' the head and arranged to be made in accordance with my invention showturned on a transverse axis to any desired ing in full and dotted lines how the paint position to lead the hoses in from beneath and air hoses are arranged to be led in from :31) or above the handle, Whichever Way suits the beneath or above the handle and how a paint so operator or is most convenient for operating cup may be mounted on the one goose-neck under given conditions. This feature does instead of having the paint hose connected away with the objections noted since the inthereto; dividual Workman can fix the gun to suit F ig. 2 is a horizontal section on the line 33 himself. v 2 2 of Fig. l; S5

Spray guns have also commonly been pro- Fig. 3 is a detail on the line 3 3 oia Fig. 2; vided with a rotary air nozzle, the turning Fig.- 4 is a front View of the nozzle strucof which from one position to another brought ture; into play diametrically opposed air jet open- Fig. 5 is a lonigtudinal section on the line 2J ings to change from a round to a flat spray. 5-5 of Fig. 4; i j

The necessity for turning the nozzle was, Fig. 6 a transverse section on the broken however, objectionable Jfor several reasons. line 6%@ of Fig. 5; the principal objections being that one was Fig. 7 is a similar vieiv showing' the jet never sure, after havin(Y changed from a openings closed by the auxiliary valve, and

round to a i'lat spray, that. exactly the same Fig. 8 is a perspective View of the color 95 spray Would be obtained upon returning to nozzle on an enlarged scale. the round spray, the adjustment being usual- The same reference numerals are applied to ly disturbed, and it Was also more or less corresponding parts throughout the views. bothersome to have to loosen the air nozzle The spray gun of my invention comprises a 50 to permit turning the same and after the head l() suitably cast integral with a barrel *10o 11, the butt 12 of which has a handle 13 fastened thereto on the under side. The latter is suitably molded of a material such as bakelite for lightness and cheapness and has two or more holes 14 provided in a wall closing the upper end thereof through which studs 15 projecting from the butt 12 are arranged to be extended, nuts 16 being threaded onto said studs with the aid of a socket Wrench entered through the open lower end ofthe handle. A hook 17 is suitably cast integral with the barrel 11 for the purpose of hanging the gun onto any convenient projection, as for example, on the tank of the spraying outfit. lA nozzle structure, indicated generally by the reference numeral 18, the details of novelty of which will be presently described, is mounted on the head 10, its color nozzle 19 being in communication with a liquid chamber 20 in said head and its air nozzle 21 being in communication with an air chamber 22 in said head. A needle valve 23 controls the discharge of the liquid or semi-liquid material from the color nozzle 19 in a manner presently to appear, and another needle valve 2a controls the discharge of air from the air nozzle 21, both needle valves being operable, as will presently appear, by trigger 25. o much for a general understanding of the spray gun of my invention.

Spray guns, as heretofore constructed, have had the hose Connections for the paint, or other material to be sprayed, and air connected thereto in divers ways. Most manufacturers of spray guns made various models with different hose connections in order to be sure to suit the fancy of workmen having different preferences. It is an acknowledged fact that although some workmen will insist upon having the hose connections for the gun led in from beneath the handle, others prefer and insist upon having the hose connections made from above the handle. The merchandising and stocking of these devices has, therefore, been a difficult proposition. Moreover, a spray gun having hose connections made in one way might be suited to certain classes of work and not at all suited to other work. That is to say, spray guns having fixed hose connections were not adaptable to difierent working conditions. The spray gun of my invention has been designed with a special view to avoiding the objections just referred to, and has two goose- necks 26 and 27 swivelled on the head 10 for adjustment on a transverse horizontal axis permitting the paint and air hoses 28 and 29 respectively to be led in from beneath or above the handle 13. The goose-necks are shown in full lines downwardly directed with the hoses attached thereto leading in from beneath the handle. Many workmen prefer this arrangement. In dotted lines, however, the hoses are shown leading in from above the handle, and the goose-necks are shown as rearwardly directed for connection therewith. lVorkmen who prefer that arrangement can, therefore, adjust the gun to suit their convenience. Thus, one model takes the place of two or more. Aside, however, from this advantage, there is another advantage with this construction; namely, that the gun can be adjusted to suit any job which may be encountered. For example, in ceiling work, where it would be awkward to use a gun having the hoses leading in from beneath 'the handle, the goosenec-ks can be swung to the dotted line position shown in Fig. 1 to have the hoses led in from behind or above the handle On the other hand, in the case of floor work where it would be unhandy to use a gun having the hoses leading in from above or behind the handle, the goose-necks can be swung to the full line position shown in Fig. 1 for handier operation. The gun is therefore practically univel-sally adaptable to working conditions. The goose-neck 26 is mounted on a hollow boss 30 on one side of the head 10, and the goose-neck 27 is mounted on another hollow boss 31 on the opposite side of the head, the boss 3U having communication with the liquid chamber 2O and the boss 31 with the air chamber 22. The bosses are externally threaded to receive gland nuts 32 for clamping the goose-necks by means of tapered glands 33 onto the ends of the bosses. rlhe tapered glands afford liquid and air-tight joints for the respective goose-necks, in addition to affording swivel adjustment, it being understood that the gland nuts are tightened when the 0`cose-necks are adjusted to the proper position in order to insure tight joints and also in order to keep the hoses in proper position. lfhere it is desired to use a paint cup such as that indicated in dotted lines at 34 in Fig. 1, suitable provision may be made for mounting the same directly on the goose-neck 26. rThe connection shown at 35 is one threading onto the goose-neck, but it will be evident that any other suitable form of connection might be employed.

The nozzle structure 18 is shown to best advantage in Figs. 4 to 8. The color nozzle 19 constitutes the internal nozzle of said structure, and the air nozzle 21 tie external nozzle. The former is threaded into the open end of the liquid chamber 2O and has a cylindrical bore in the threaded shank portion thereof and a tapered bore in the head portion terminating at the tip of the nozzle in a restricted discharge orifice 36 formed exactly concentric with the rest of the nozzle. The needle valve 23, above referred to, extends through the nozzle 19 and has the tapered end 37 thereof arranged to close the orifice 36. The color nozzle is enlarged and provided with facets at 38 for the application of a. wrench in the threading of the nozzle into the chamber 2O in the head 10. The nozzle is tapered and reduced in size just in front of the faceted part, as shoivn at 39, and between this part and the reduced cylindrical tip portion 49 has a-cylixndrical pilot portion 4l made precisely concentric With the discharge orifice 36 and tip 40 for a purpose Which will presently appear. The portion 4l is fluted longitudinally, as shown at 42, to provide air passages. Telescoping With the pilot portion 4l of the color nozzle is a cylindrical sleeve portion 43 of the air nozzle 2l, which in turn is machined in truly concentric relation vfith the air discharge orifice 44. The close he of the pilot portion 4l ivithiii the sleeve portion 43 results in the orifice 44 being` held in absolutely true concentric relation With the orifice 36. Now, the air nozzle 2l, as shown in Fig. 2, is arranged to be supplied with air under pressure through the port 45 in the head l0 communicating Wit-h the air chamber 22, Whenever the needle valve 24 is opened, as will presently appear. A gland nut 46 threading onto the head l0 serves to clamp the air nozzle 2l onto the head by its marginal Hangs 47, making an air-tight oint. Air is, therefore, supplied through the passages circumferentially of the tip 40 of the color nozzle and hence annularly With respect to the orifice 86 of said nozzle to produce a uniform, finely divided spray by atomization of the paint or other liquid or semi-liquid material issuing from the color nozzle. The absolutely concentric relation of the tivo nozzles, and hence of their discharge orifices, obtained by the telescoping of the one nozzle on the other is, of. coui'se, essential to the production of the uniform, finely divided spray. rlhis feature l first disclosed in my (fo-pending application, Serial No. 222,481 filed September 2S, 1927, in which application l also pointed out that the telescoping fit of the air nozzle on the color nozzle insures'tlie concentric relation irrespective of any slight variation in the axial relationship of the tivo nozzles such as is bound to occur in different spray guns, owing to the fact that it is practically impossible, especially in quantity production, to produce the parts Without some slight variation in size of a few thousandths one Way or another from specified dimensions. In the present case I have further improved the nozzle structure by eX- tending the tip 40 of the color nozzle 'i9 slightly beyond the orifice 44 of the air nozzle 2l and slotted, saw-toothed, or otherwise notched the extremity thereof as indicated at 48, as for example, by filing the tip criss- Y cross With respect to the orifice 36 deep enough so that the base of each notch or slot is approximately in the plane of the end of the air nozzle 2l. l have found that this mutilation of the tip of the color nozzle, and, of course, other forms of mutilation might be found by experiment to give similar results, afforcs much better atoinization with less air than has heretofore been required. l attribute thisy improved result to the fact that the mutilation of the tip of the color nozzle affords a greater area for the spreading of the paint by capillary attraction on the tip of the color nozzle for contact with the air discharged annularly about the same. Owing to the fact that this spray gun operates With less air than other guns, I provide a restriction valve on the spray gun which can be regulated to suit requirements. rl`his feature will now be described.

Referring to F ig. 2, the needle valve 24 extends through a packing bushing 49 threaded into the air chamber 22 from the rear, and also through packing material 50 and a packing plug 5l threaded behind the bushing 49, the bushing 49, packing 50 and plug 5l together serving to afford an airight joint, similar to the liquid-tight joint afforded for the needle valve 23 by the bushing 52, packing 53 and plug in the rear of the liquid chamber 20. The needle valve 24 is squared for a portion of its length behind the pointed reduced end 55, as indicated at 56, for reception in a square hole in a valve plug 57 threading into the air chamber 22 in front of the bushing 49. The plug 57 has a smooth, slightly tapered forward end 58 which would be arranged to seat at 59 in the air chamber 22 if tli-e plug 57 were threaded forward far enough in said chamber. Now, the needle valve 24 has a knurled head 60 on the rear end thereof permitting the saine to be turned by hand for the purpose of adjusting the plug valve 57 to restrict the flow of air into the air chamber 22 from the air supply hose 29. rllie needle valve 24, nevertheless, has freedom for reciprocation in the plug valve 57 for the opening and closing of the port 45. ji cross-head 6l has a slot in one end thereof for reception of the crosshead in an annular groove 68 formed in the needle valve 24 intermediate the ends thereof. The cross-head hasI the rounded iiibs 64 of the trigger 25 engaging the front thereof for operation of the cross-head by finger pressure on the trigger. Movement of the cross-head is first communicated tothe needle valve 24 directly by the cross-head 6l by reason of the connection just described. A sleeve 65, fitting aboutthe needle valve 24, is reciprocable in a cylindrical bore G6 provided in the butt l2, wherein a coiled conipression spring 67 is disposed engaging at l, one end on an annular seat G8 at the rear end 57; the valve 57 can be adjusted even 'ivhen the needle valve 24 is held open by the trigger 25. Thus, the Workman can adjust the valve While he obser es the character of the .spray produced and is, therefore, able to oi tain the right sort of spray without any guess-Work and with a minimum loss of time.

The needle valve 23, as also appears in Fig. 2, is provided With a lmurled head on the rear end thereof by means of which the same is arranged to be turned for the purpose of, from time to time, grinding in the discharge orifice 86 of the color nozzle to insure good operation of the spray gun. In the past, the needle valve controlling the. discharge of the paint or other liquid was invariably held against turning or else vias not accessible so that it could be turned, and if the paint or other liquid dried onto the walls of the color nozzle at the disci orifice, there was no Way of reinedying the difliculty except by taking the gun apart, as for example, by removing the color nozzle. It is, therefore, quite an advantage to be able to clean the discharge oriice of the color nozzle by simply turning the needle valve therein to grind it clear of any obstruction. In order not, in the turning of the needle valve for the grinding operation, to change its timed relation to the needle valve 2li centrolling the discharge of air, the same should be simply turned back and forth in the slee Je 71, in which the same is threaded. The sleeve is shown as having an enlargement of one end of the bore thereof, as at 72, internally threaded to receive the threaded enlarged end portion 73 of the needle valve. The sleeve is held against turning by a lug' 78 on the cross-head 61 engaging in a slot 78 provided in the end of the sleeve. The sleeve is slidably received in the cylindrical bore 74 provided in the butt 1'., and a coiled coinpression spring 75 fits in said bore about the sleeve engages at one end on a` seat 76 provided at one end of the bore and at the other end engages an annular shoulder 77 pro vid-ed on the sleeve 71. Thus, the needle valve 9.3 is normally held closed but is arrange-:l to be operated by the crossliead (31 by prcssure on the trigger 25. pearing in Fig. 2 between the cross-head. (il and the end of the sleeve 71 indicates to what extent the needle valve 24 is opened in advance of the needle valve 23 when the trigger 25 is pressed fWhcn it is desired to change this timed relationship between the two needle valves, the needle valve E?, is turned by means of the head 70 one We ,i er the other to advance or retard the operaron of the needle valve 23 relative to the needle valve 24.

Referring now more particularly to Figs. 4 to 7, the air nozzle 21 has a pair of knobs 79 soldered or otherwise suitably secured in holes 8O at diametrically opposed points on said nozzle, said knobs having air jet open- The clearance ap-Y ings 81 communicating With the bores 82 thereof Which open into the interior of the air nozzle 21. l have provided an auxiliary valve 83 of a rotary type Within the nozzle 21 operable by a peg 84: projecting through an arcuate slot 85 provided in the Wall of the air nozzle, the said valve being generally of frustoconical form to fit Within the air nozzle, as shown in Figs. 5 to 7, and being held in place by a split ring 86 seated in an annular groove 87 provided therefor on the inside of the air nozzle 21. The auxiliary valve 83 is, therefore, a. permanently assembled part of the air nozzle 21 and when the air nozzle is removed anc. replaced, there are no eXtra parts to be handled and possibly mislaid or lost. The valve 83 has the small end thereof cut to the tivo-segment cani shape shown most clearly at 88 in Figs. 6 and 7. Thus, tWo ports 89 are formed on the valve 83 arranged to register with the ports adorded by the inner ends of the bores 82 of the knobs 79 when the yvalve 83 is turned to the position shown in Fig. G. N ith th-e valve in this limit position there is a full capacity discharge of air from the et openings S1 and a flat spray is produced. The valve 83 may, however, be turned to intermediate positions Where the discharge from the jet openings 81 is cut doivn to any desired amount to change the shape of the spray produced. Vhen, however, the valve is shifted to the other limit position shown in Fig. 7, the jet openings 81 are entirely out off from communication with 'the supply of air and a round spray is produced. lt Will be seen that an almost instantaneous change can be made from a round spray to a flat spray or vice versa, and that the chang-e does not involve any tampering with the air nozzle and hence there is no danger of changing its operating characteristics; exactly the same spray Will be obtained upon returning to the round spray as Was obtained before the change from the round spray to the flat spray. ln most spray guns the air nozzle had to be turned to change from a round to a flat spray and that usually meant throwing the gun out of adjustment; if the gun happened to be operating just right before changing from a round to a fiat spray, there Was little likelihood of the same spray being obtained upon returning to the round spray. Moreover, the turning of the nozzle necessarily involved the loosening and retightening thereof, which in itself was more or less bothersome. A Workman operating With a spray gun embodying the present feature has, therefore, many advantages over one Working With one of the unimproved spray guns; he loses no time in changing from the one kind of spray to the other, and is always sure that his gun will operate the same after a change as before.

lt is believed the foregoing description conveys a clear understanding of the-13o various novel features of my invention. It should be understood that while I have made reference in the foregoing description to various specific details of construction, these are merely for the purposes of illustration, and the appended claims are, therefore, intended to cover all legitimate modifications and adaptations coming within the spirit and scope of the invention.

I claim:

l. ln a spray gun, comprising a body providing relatively fixed head and handle portions, a nozzle structure on the head having liquid and air chambers side by side for the discharge of liquid and air under pressure, and valves side by side extending into said chambers and operable from the handle, a pair of hollow bosses formed on said body extending approximately on the same transverse axis laterally from opposite sides thereof in front of the handle and in communication respectively with the liquid and air chambers, one being arranged to serve as an air connection and the other as a liquid connection, a pair of goose-necks swiveled on said bosses and arranged to be turned on a transverse axis relative to the body and handle to direct the free ends thereof as desired, .the same being adapt-ed to have communication with conduits for supplying liquid and an' under pressure, and devices carried on said bosses and arranged to be tightened to clamp the goose-necks in adjusted position.

2. In a nozzle structure for a spray device, the combination of an internal nozzle having a reduced tip provided with a central discharge orifice and an enlarged external cylindrical bearing portion behind the tip concentric with the discharge orifice, and an external nozzle having a reduced tip providing a transverse front wall having a central discharge orifice arranged to be substantially concentric with the first mentioned orifice and having a cylindrical bore behind said front wall concentric with the discharge orifice therein arranged snugly to receive and telescope upon the aforesaid cylindrical bearing portion of the internal nozzle whereby to insure exact concentric relation between the discharge orifices of the two nozzles, the tip of the internal nozzle extending through and substantially beyond the discharge orifice of the external nozzle, and having the end thereof notched outwardly with reference to the discharge orifice of said internal nozzle, the notches being` of suiiicient depth so that their bases are disposed in a plane substantially coincident with the end of the external nozzle substantially as herein shown and described.

3. ln a spray gun comprising a body providing head and handle portions, and a nozzle structure comprising an internal color nozzle having communication with a liquid passage in said head, and an external air nozzle having communication with an air passage in said head, an air valve, a needle valve having its forward end conical in form and extending into the color nozzle and arranged to close the discharge orifice thereof, and a trigger having connections with said valves for operating the same, means whereby the operative relation of the needle valve to the trigger may be adjusted, said .needle valve having such operative relation to the trigger that the same is arranged to be reciprocated thereby, the rear end of said needle valve projecting from the gun` and an adjusting knob on the projecting end of said needle valve whereby the same is arranged to be turned at will to grind out the discharge orifice of the color nozzle.

l. In a spray gun comprising a body providing head and handle portions, and a nozzle structure comprising an internal color nozzle having communication with a liquid passage in said head, and an external nozzle having communication with an air passage in said head, a trigger, an air valve arranged to be operated thereby, and a needle valve having the forward 4end thereof made conical and extending into the color nozzle and normally seated in the discharge orifice thereof, said needle valve being arranged to be reciproeated by the trigger and having a part threaded on the rear end thereof arranged to be engaged by said trigger for that purpose, the said part being arranged to be held against turning relative to the needle valve, and said needle valve having a head on the extremity thereof for turning the same in either direction whereby to adjust the needle valve in relation to the trigger and color nozzle, or for turning the same back and forth whereby to grind out the discharge orifice of the color nozzle.

5. In a device as set forth in claim lwherein the said part has a spring acting against the same tending normally to seat the needle valve in the discharge orifice of the color nozzle, said part having a recess in the forward end thereof, a part operated by the trigger for operating said needle valve having a projection thereon received in said recess whereby to hold said part to permit threading of the needle valve therein in one direction or the other.

6. In a spray gun or the like comprising a main body in the form of a barrel having a butt portion at one end thereof, a hollow handle formed in one piece open at the bottom and having a wall closing the top thereof, said wall having one or more openings provided therein, there being one or more studs projecting from the under side of the butt portion arranged to extend through said openings, and nuts threading on said studs inside the handle to fasten the handle to said butt portion.

7. In a spray gun comprising a body providin g head and handle portions, and a nozzle structure comprising an internal color nozzle having communication with a liquid passage in said head, and an external air nozzle having communication with an air passage in said head, a needle valve for controlling the discharge orifice of the color nozzle, another needle valve controlling the discharge of air from the air passageto the air nozzle, a trigger arranged when operated to operate both needle valves, the last mentioned needle valve being free to turn relative to the trigger, and

a valveplug threaded in the air passage arranged to restrict the flow of air through said passage as desired, said valve plug having such operative relation to the last mentioned needle valve whereby the same is arranged to be adjusted by turning of the needle valve but the needle valve is arranged to be reciproca-ted relative thereto in the operation of the trigger.

8. In a spray gun comprising a body providing head and handle portions, and a nozzle structure comprising an internal color nozzle having communication with a. liquid passage in said head, and an external air nozzle having communication with an air passage in said head, a needle valve extending into the color nozzle and arranged to close the discharge orifice thereof, another needle valve disposed substantially in parallel rele tion therewith extending into the air passage and arranged to close the discharge end thereof, spring means normally holding said valves closed, a cross-head for operating both valves against the action of the spring means, and a trigger arranged when pressed to communicate movement to the cross-head, the first mentioned needle valve being arranged to be turned relative to the cross-head and having a head on the rear end thereof to facilitate turning the same by hand for the purpose of grinding out the discharge orifice of the color nozzle whenever desired.

9. In a spray gun comprising a body providing head and handle portions, and a nozkzle structure comprising an internal color nozzle having communication with a liquid passage in said head, and an external air nozzle having communication with an air passage in said head, a needle valve extending into the color nozzle and arranged tol close the discharge orifice thereof, another needle valve disposed substantially in parallel relation therewith extending into the air passage and arranged to close the discharge end thereof, spring means normally holding said valves closed, a cross-head for operating both valves against the action of the spring means, and a trigger arranged when pressed to communicate movement to the cross-head, the first mentioned needle valve being arranged to be turned relative to the cross-head, a head on the rear end of said needle valve facilitating the turning thereof by hand for the purpose described, a

part threadedly mounted on the needle valve behind the cross-head having the spring means acting against the same tending normally to hold the needle valve seated, the said part being arranged for engagement by the cross-head to unseat the valve and being held by the cross-head against turning with the needle valve, whereby to permit threading of the needle valve relative thereto to change the operative relation between the needle valve and the trigger at the cross-head.

10. In a spray gun comprising a body providing head and handle portions, and a nozzle structure comprising an internal color nozzle having communication with a liquid 'passage in vsaid head, and an external air nozzle having communication with an air passage in said head, a needle valve extending into the color nozzle and arranged to close the discharge orifice thereof, another needle valve disposed substantially in parallel relation therewith extending into the air passage and arranged to close the discharge end thereof, spring means normally holding said valves closed, a cross-head for i operating both valves against ther action of the spring means, and a trigger arranged when pressed to communicate movement to the cross-head, the second needle valve being free to turn relative to the cross-head, a restriction valve for controlling the flow of air through the air passage, and means providing an operating connection between the restriction valve and the needle valve permiting free reciprocation of the needle valve relative to the restriction valve but permitting operation of the restriction valve by turning of the needle valve.

1l. In a spray gun comprising a body providing head and handle portions, and a nozzle structure comprising an internal color nozzle having communication with a liquid passage in said head, and an external air nozzle having communication with an air passage in said head, a needle valve extending into the color nozzle. and arranged to close the discharge orifice thereof, another needle valve disposed substantially in parallel relation therewith extending into the air passage and arranged to close the discharge end thereof, spring means normally holding said valves closed, a cross-head for operating both'valves against the action of the spring means, and a trigger arranged when pressed to communicate movement to the cross-head, the second needle valve being free to turn relative to the cross-head, a head on the rear end of said needle valve facilitating the turning thereof by hand, said needle valve having a squared portion on the forward end thereof within the air passage, and a restriction valve plug slidably received on the squared portion of the needle valve and threadedly received in the air passage Whereby the needle valve is free for reciprocation AllO relative to said plug but the plug is arranged to be adjusted by turning of the needle valve.

12. ln a spray gun comprising a body hava head portion and a. butt portion and provided with a haalle, and a nozzle structure on tl e head portion, said nozzle structure including two substantially parallel needle valves extending rearwardly troni the head portion in approximately the saine horizontal plane toward the but-i' portion, a hollow bos,` on said butt portion providing two reces therein one for each ot said needle valves, spring means in said recesses for normally seating the valves, the needle valves ln posed between the head portion and said boss, means on the exposed portions ot the needle valves providing shoulders tor abutnient by trigger to unseat the valves, and a trigger arranged to engage said shoulders to unseat the valves.

13. A structure as set forth in claim 12 wherein the needle valve controlling the discharge orn liquid from the nozzle structure has the rear end thereotl projecting troni said boss and provided with a knob on said end to permit manual operation ot said valve independently of operation of the 15. A struct-ure as forth in claim 1&2 wherein the needle valve controlling t e discharge oit liquid from the nozzle structure has the rear end thereoic projecting `troni said boss and provided with a knob on said l to permit manual operation of lo valve independently of operation ot' the tri-goei', and wherein the means on the exposed por ion of said valve comprises a member threaded on the valve tor adjustment ot the shoulder deiined by said member toward and rway from the trigger, said member oeing held against turning and said valve Leing arranged to be turned by means ot said knob to effect the adjustment.

16. A. structure iorth in claim 12 wherein the needle valve contrcdling the discharge of air from the nozzle structure has the rear end thereof projecting lroin said boss and provided with a knob on said end to permit manipulation of said valve independently of operition or" the trigger.

17. A structure as set torth in claim 'l2 including a restriction valve in said heac portion for controlling the flow of air through the nozzle structure, said vali'ie being arranged to be adjusted by turning the same, the needle valve for controlling the discharge of air from the nozzle structure being extended through said restriction valve and arranged to serve in turning the same.

18. A structure as set forth in claim 12 including a single crosshead disposed for abutment with the shoulders on the exposed portions of the needle valves, the said crosshead being arranged to be engaged and moved by the trigger.

19. ln a spray gun, an elongated body having a head portion at the front and a handle portion at the rear end in a fixed spaced relationship to one another, a nozzle structure on the body portion for the discharge of liquid and air under pressure, said body having liquid and air passages provided therein communicating with the nozzle structure, liquid and air conduits communicating with sources of liquid and air supply and disposed on opposite sides of the body in front of the handle portion, and means on opposite sides of the body between the head and handle portions for establishing communication for the liquid and air conduits with the liquid and air passages, said means being so constructed and disposed with relation to said handle portion to permit eX- tension of the conduits trom the spray gun in any one of several different directions with relation to the handle and always in balanced relation to said handle` 20. ln a spray gun comprising a body having passages provided therein for conducting liquid and air to a head portion ot' the body, a nozzle structure on the head portion including` an internal nozzle communicating with the liquid passage and having a substantially central discharge orifice, and an external nozzle communicating with the air passage and having a substantially central discharge orifice concentric with the lirst mentioned orifice, the external nozzle also having a pair of secondary air jet openings at substantially diametrically opposed points with reference to the central orifice and normally ycommunicating with the air passage, said external nozzle being of tapered form internally, a rot-ary valve tapered externally to tit inside the external nozzle for rotation from a closed to an open position, oi vice versa, to control communication between the secondary air jet openings andthe air passage, the external nozzle being removable from the head portion to afford access to 'he internal nozzle and permit cleaning, means on the external nozzle behind the rotary valve to hold the same in place, whereby vto seal the secondary air openings when the valve in closed position and whereby also to permit removal of said valve with the external nozzle as a unit, and means on the rotary valve projecting through a slot provided in the wall of the external nozzle to permit manual operation of said valve from outside the nozzle structure.

2l. In a spray gun, the combination of an elongated body having a head portion at the front end and a handle portion at 'the rear end in a iixed spaced relationship to each other, a nozzle structure on the head portion for the discharge of liquid and air under pressure in the form or" a spray, there being liquid and air passages provided in said body communicating with the nozzle structure, there being also laterally extending entry passages provided on said body on opposite sides thereof communicating one with the liquid passage and the other with the air passage, said entry passages being in a. predetermined spaced relation to the handle portion behind the head portion, and a pair of flexible conduits attached to the opposite sides of the body in communication With the entry passages, the one having communication With a source of air under pressure and the other having communication with a source of liquid supply, the conduits being independent of one another but arranged to be extended together from the body in ony one of several diierent directions with relation to the handle portion, the same being in any case in balanced relation to said handle.

22. In a spray gun, the combination of an elongated body having a head portion at the front end and aI handle portion at the rear end in a fixed spaced relationship to each other, a nozzle structure on the head portion for the discharge of liquid and air under pressure in the form of a spray, there being liquid and air passages provided in said body communicating with the nozzle structure, therev being' also laterally extending entry passages provided on said body on opposite sides thereof communicating one with the liquid passage and the other with the air passage, said entry passages being' in a predetermined spaced relation to the handle portion behind the head portion, a pair of rigid goose-necks of a certain form having angular inner ends extending toward each other from opposite sides of the body and registering with the aforesaid entry passages, the outer ends of said goose-necks being adapted one to have communication With a source of air supply under pressure and the other With a source of liquid supply, and means for connecting the inner ends of said goose-necks with the body to swivel with respect thereto to any one of several dilerent positions, said goose-necks being normally extended in the same direction from the body so as to be in balanced relation to the handle.

23. A spray gun comprising an elongated body having a head portion at one end and a handle portion at the'other in a predetermined relationship, a nozzle Vstructure on the head portion, liquid and 'air passages provided in the body communicating with the nozzle structure, and liquid and air connections for the spray gun communicating With the liquid and air passages and extending laterally from opposite sides of the gam in forwardly spaced relation to the handle.

In Witness of the foregoing I aiix my signature.

SWAN F. ANDERSGN.

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