US2473667A - Spray gun - Google Patents

Description

June 21, M M, WARNER SPRAY GUN Filed June 14, 1945 ff /f ff 2g z III m Z9 7/ M ,z/ 27 patented `une 21, 1949 UNITED STATES ATENT OFFICE 2 Claims. l

My invention relates to spray guns adapted `particularly for spraying liquids such as paints, enamels, or chemicals.

Heretofore, in the use of spray guns, the cans or containers for the liquid to be sprayed were separate from the gun and connected thereto by hose -or other conducting means, and with such liquid conducting hose and an air hose extending from the gun, easy and accurate operation of the gun might be interfered with.

An important object of my invention is to `produce a spray gun having a bore or chamber into which liquid containers can readily be inserted for connection with the sprayer nozzle.

A further object is to provide a bore through the grip portion of the gun into which cylindrical bottles or cans containing the liquid may be readily inserted for connection with the sprayer nozzie.

A further object is `to provide an arrangement in which a discharge pipe projects from the gun barrel axially through the bore in the grip for extending into the bottle or can when inserted into the bore for conducting the bottle or can contents to the barrel for discharge through the nozzle.

The above referred to and other features of my invention are embodied in the structure shown on the drawings, in which:

Figure l is a side elevation of the gun;

Figure 2 is a plan view; A

Figure 3 is an enlarged section on plane III-III Figure 2; and

Figure 4 is a section on plane IV-IV Figure 3.

The main frame of the spray gun shown is preferably formed of halves Ii] which may be molded integral preferably of plastic material and which are detachably secured together as by screws II to form a body portion l2 and a handle or grip portion I3 depending therefrom. When the halves Ill are secured together, the body portion I2 provides the cylindrical -bore I4 for receiving a barrel I5. Extending into the outer portion of the barrel is the bore I6 threaded at its outer end Vfor receiving a spray nozzle I1.

Extending rearwardly from the body part I2 and clamped between the halves I is a housing I8 having the upper bore I9 'therethrough and the lower bore 23. A plug ZI has threaded engagement in the outer end of the bore I9 and has the valve stern 22 extending therefrom `through the passageway 23 in the barrel I5 and .the bore I6, the stem terminating in the needle valve end 24 co-operating with the outlet end of the nozzle I1 to control the volume of flow from the nozzle. An air cap '25 is threaded on the outer end of the barrel I5 to surround the nozzle and the interior of .the cap is lconnected with the bore I9 through the passageway 26 in the barrel.

Threading into the outer end of the bore 20 is a plug 21 having the passageway 28 therethrough for air flow vand having the threaded nipple end Zt for receiving a coupling (not shown) for connecting an air hose with the plug. The bore 26 is connected by a passage 30 with the bore I9 for iow of air through the passageway 23 and air cap past the end of the nozzle. In advance of the passage 30, a valve seat member 3I in the bore 20 provides the chamber 32 within which is the ball valve 33 for controlling the passageway 34 through the valve seat member, a spring 35 within the valve chamber tending to hold the valve in closed position.

In the front end of the bore 23 a plunger 36 is slidable, the stem or pin extension 31 at its outer end projecting into the passageway 34 through th-e seat member 3 I. Extending through the body part I2 below the barrel I5 is a rectangular guide passage 38 for the trigger slide 39 which `at its forward end has a trigger member 49 secured thereto. In its rear end the rtrigger slide has a T slot 4I for receiving the T head at the inner end of the plunger 36. When the gun is at rest, the ball valve 33 is held closed by the spring 35, the `spring pressure being exerted through the ball against the stern end 31 of the plunger to hold this plunger and the trigger slide in outer position. Now, when the gun is to be used, the finger of the hand grasping the handle part I3 will engage with the trigger to shift the trigger slide and the plunger 3B rearwardly for unseating of the ball valve 33 by the plunger stem end 31 so that air under pressure may then ow through the air cap at the nozzle.

Extending through the grip or handle portion I3 `is the bore 43 forming a chamber for receiv- `ing containers 44 of the liquid to be sprayed.

Extending :through the bore is a delivery tube 45 which is secured at its upper end in the barrel I5 for communicating with the barrel lbore I6, the trigger slide having the clearance passageway 46 therethrough for the tube so that the tube will not interfere with the operation of the trigger slide for control of the air valve.

Welded to the tube 45 is a washer 41 which, when the tube is in service position, is located at the upper end of the bore 43. Below the washer a compression spring 48 encircles the tube for engaging against the washer 49 slidable on the tube and faced by a sealing washer 50. The

sistance of the spring 48 so that the mouth of' the container will be substantially c1osed.r,,'.To hold the container in service position` a slide cover I have shown a practical and eflicient embodiment of the features of my invention, but Ido not desire to be limited to the exact construction, arrangement and operation shown and de- 5 scribed, as changes and modications may be made without departing from the scope of the invention as dened in the appended claims.

I claimfvasmy invention: l 1 1. Agsprayggun comprising a bodyl portion and a grip' portion, "said bodyportion including an A air passageway and a. paint passageway disposed 4longitudinally therein, a conical nozzle connected :-,-"02' said passageways with the paint passageway c erit-rally disposed and the air passageway form- 5I is provided for the lower end ofthe bore' 43,' ""15 ing'an-a-nnular discharge orifice about said paint this slide cover having fianges..5g engaging Ninv guideways 53 in the end of the handleuor grip part I3. After insertion of the containerfandclosure of the cover 5|the lower end of the tube .,4511will: be close to:;the bottom ofthe.-l container,

andwhen `the triggerzisrnow setffor opening: of

the valve. 33, airunderpressure-will flow through the .air cap: v pastthet-outer. end of` .the nozzle "for"creatinggsuction':iny the nozzle andy in the bore?, i6 .and rtube.45 Whichwill draw the-.can 4contents out through .the nozzleandinto theair -streamior comminution and atomizing :orspraying.l thereof. r Whena container isyemptiedythe .slide ,cover,5,|: is opened Aandthe empty, container I vportion -of each halfff having/1' a semi-cylindrical recess- -portionnforrforming ai cylindrical l,boreamd withdrawmthe spring .48 thenshifting the wash- .e'rsu49 ,and 50 ydown into: engagement with Aaan abutment, onthe tube145, which abutment :may .be l,in :thepform ofra `snap ring- 54 4on the... tube.

When another container isnow insertedV into .the y ,.drical vborehavingfseparate? air-and--fpaint'pasbore.43; y.the Awashers will besmoved away a from the;snap.ringv to be held in closingl engagement with the container mouth by the force of the springxz; f'

At. the end'ofthe grip'partfl openings 5.5.,may ,A

)be provided which may function as sight openvings'when theicontainersare of transparent^ material for :ldeterminingrwhen the containers have been. emptied, f or for: `determining ther nature or colonof the fluid inzthe containers.. :These pasthe paint passageway of said barrel. rfc-1.'

sageways` 55, alsoiconnect. the.,boref43=withthe `atmosphere,; therebeing sufficient clearance be- ,tWeenthe-,washers 49 and;.50 andthe-tube l45,-.for .entrance of 'air into'the 'container to compensate omthe volumeI of liquidv withdrawn therefrom duringa sprayingxoperation., .l 1am-1. z:- My` 'improved spray; gun is` Aof particular; utility .and kadvantage .wher-e comparativelysmalltf quanrtities, lof diierent 'colored ,paints or 'enamelsy|` or 4different chemicals, vare to be sprayed, .thechange from, one color to another or from; onev chemical toy another being quickly: accomplished Lby ,the insertion; of the containers intov the handle bore. Furthermore, vthe insertionrof the vcontainers v-into ,the gun *for direct, connection with ,the rnozzle through the discharge tubein the gun, eliminates the-use. of, hose heretofore necessary for 4connect- ;ing containers `separate .'from the .gun -Wl'th fthe gungnozz'le, and fthe. gun may14 thus be-morefreadily and accurately manipulated and operated.

passageway, ,a spring-pressed valve controlling flow of air int'o said air passageway, a sliding rodanounted in the body for transmitting the movement of the operators finger directly by a o ,slidingmovemennto said valve iorunseatingathe sameto l permit ,-fldweofiair into said ain-:passageway, said grip member abuttingtsaid(bodyzfporf-tion and -havingiarchamberttherein. andaupaint ,container disposed?,- in'. said r.chamber in communi- 5 cation with the paint passa eway of said body portion.: a: :r 1 ,l 2;: A sprawgun comprlsingrtwofopposi .posed half rportions; f eachrncluding Van integrally formed handle andbodyirhalf-portion, ther body lthe handle portion ofA eachffhalf havingfa recessed portion foraformingr'a" chamber when `theffhalves :are` assembled; a; barrel pfositionedin1 said: cylinsageways; longitudinally therein; a vvalve supported byesaid=barrelcontrolling-ztheriiow 'oivair to said air passageway, a rod disposed for longituaEF'ERENas. cI'TEp M The following 4references are of record in the 5 me Of @iraient UNITED STATS PATENTS, ,l Daten ,dinal .sliding movement between-f "the". assembled v 4 0 ybodyportions s for ltransmittingi the "movement .zof

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