US1650686A - Spray gun - Google Patents

Description

H. D. BINKS SPRAY GUN Filed NOV. `'7. 1925 if; "i

-Nrrso STA Tes v 1,656,666 PATENT OFFICE.-

HARRY D. BINKS, OF OAK PARK, ILLINOIS, ASSIGNOR TO B'INKS SPRAY EQUIPMENT CO., 0F CHICAGO, ILLINOIS, A CORPORATION OF'ILLINOIS. l

SPRAY GUN.

Application filed November 7, 1925. Serial No. 67,515.

My invention relates to spraying appliances-of the general class employed for projecting liquids in the form of a. finely divided spray. In onc'of its important objects, my invention provides a. construction of a manually operated appliance of thisl class which will permit the air supply to be drawn either through the handle of the appliance or through the upper rear end of the same.

In another object, my invention provides a spray appliance construction which will readily afford a plurality of definite gradations of the amount of air supplied to the nozzle of the appliance, and which will automatically vary the rate of flow of the liquid also in proportion to the variationsin the amount of air. Furthermore, my invention provides an appliance construction for these latter purposes which will be easily assembled and cleaned and which will readily permit an adjusting of the time interval between the admission of air and of liquid into'the nozzle of the appliance. Still further and also more detailed objects will appear from the following specification and from the accompanying drawings, in which Fig 1 is a central, vertical and longitudinal section through a spraying appliance of the so-called spray gun type embodying my invention. v

Fig. 2 is an enlargedtransverse section taken 'along the line 2-2 of Fig. 1.

Fig. 3 is an enlargement of portions of the section of Fig'. l. Fig. 4 is an ,elevation of the tubular valve body which houses the air control member.

Fig. 5 is an elevation of the air control,

member.

In the illustrated embodiment, my spraying appliance includes a body or barrel portion 1 carrying a rearwardly and downwardl extendinghandle 2, thebody being threa ed at its forward end 'to receive a forwardly tapering collar 3 which limits the forward pressing of a nozzle 4 by springs -5- interposed between the rear end` of this nozzle and the forward end of the body or barrel 1 of the appliance. This forward end of the body also has mounted on it .a core 6 provided with a liquid outlet 7 which is disposed axially of the nozzle 4 and to which liquid is supplied lthrough lan inlet 8, the outlet port 7 being controlled bya retractable needle 9 in the usual manner.

end of the body member, so as to afford an l operative connection to anair duct 12 which extends longitudinally of the body member and desirably adjacent to the top of the latter. Theduct 12 has at its rear end a bend 18 leadinglto a bore in the body coaxial with thesaid nozzle and needle, in which bore the forward portion of a Valve body is mounted. This'iwalve body is shown in Fig. 4 as including an enlarged rearward por,tion 13 normally threadedinto the rear end of the body l of the spray gun, a diametrically contract-ed portion 14 forward of Athis threaded ortion and connected by a transverse perforation 15 with avalve chamber 16 in the valve body,.and ay more forward portion of still smaller diameter having intermediate its ends a groove affording aportion 17 of a diameter even smaller than that of theportion 14. When the valve body is threadedly att-ached to the body member of the appliance, theportion 17 is opposite the bent rear end 18 of theair duct 12, so

body from a hose 20, here shown as secured to ahollow nipple 21 threaded into the rear end of the valve body. This valve body has its bore contracted forwardly of the cham.-ber 16 as shown in Fig. 3,`so as to afford anannular seat 33 for avalve head 21 which desir-ably is' formed as an integral portion of the valve member or air control member of my appliance. This air control member is continuously urged forwardly by a com-4 pression spring 22 interposed between its rear end and an inwardly directedshoulder 23 within thenipple 21, the spring being desirably spirall and maintained in coaxialv relation to the said control member by apin 24 threaded intp the rear end of the control member. This. portion of this control member immediately forward of thevalve member 21 desirably has a generally cylindrical contour and is provided with a pluralit of peripheral grooves spaced longitu inally of the said member and consecutively increasing in width forwardly of that member, such as thegrooves 25, 26 and grooves, as shown by the corresponding diameters of thebores 28, 29 and 30 in Fig. 3.

When the air valve is closed by a pressing of thevalve head 21 against theannular seat 33 within the control member, therearmost groove 25 alines with thetransverse bore 19 in the control member so as to connect with the rear end 18 of theair duct 12 as shown in Fig. 3. As soon as the valve member is even slightlyT retracted so as to space thevalve head 21 from theseat 33, air from therear chamber 16 will pass through thegroove 32 and theports 42 into the chamber 31 of the valve or control member and will then pass through the smallesttransverse perforation 28 and thenarrowest groove 25 into thebore 19 and hence into theair duct 12. When thus positioned, the diameter of thebore 28 will limit the rate of flow of the air. If the valve or control member is retracted further, so as to bring thegroove 26 opposite the connectingport 19, the fiow of air will be correspondingly increased, and this flow will again be increased if the valve member is retracted still further so as to bring thelargest port 30 into registry with the connectingport 19.

To move the valve member for this purpose, I arrange it so as to be operated by thesame lever 35 which retracts the needle 9 of my appliance. This lever is here shown as having a forkedupper portion 36 straddling the body portion 1 of the spray gun and-as pivoted on apin 37 extending transversely of that body. *The needle 9 has threaded upon it anut 38, and to provide .for an operative connection between this nut and theparts 36 of the operating lever, I form the body of the gun of a skeleton shape having a lower horizontal bar portion 39 which e'xtends between thearms 36 of the said lever. This bar portion 39 of the body is narrower than the diameter of thenut 38, thereby permitting 'thearms 36 to be disposed in front of opposite lateral portions of the nut, and the operating lever also has a second pair ofarms 40 extending upwardly past o posite sides of the bar 39 and disposed behind the nut438, as shown in Fig.

2. Theserear arms 40 are spaced from theirforward arms 36 b v a distance greater than the thickness of thenut 38, thereby permitting an adjusting of thenut 38 along the needle 9 which controls the liquid outlet port 7.

The needle 9 extends slidably through a bushing 41' threaded into the cylindricalforward end portion 43 of the valve member. and this needle has ahead 43 disposed behind the bushing 41 in a chamber i5 which houses a spring 44 for continuously pressing against thehead 43 to urge the needle 9 forwardly to its closure. position. 'ith thenut 38 threaded on the needle 9, the spring 44 not only holds the tip ot' the needh` 9 in its closure position but also limits the movement of the operatingr lever so as to hold the latter substantially in the position of Fig. 1 when my spray gun is not in operation.

On retracting thelever 35, therear arm portions 40 first operate through their engagement with the bushing 41 for moving the valve member rearwardly, thereby connecting theair supply chamber 16 operatively through theduct 12 with an annular air projecting passage 46 between the core G and the bore of the nozzle 4. and also with the diagonal air ports 10. Vhen theoperating lever 35 is retracted a little farther, so as to move thenut 38 rearwardly through its engagement with theforward arms 36, the needle 9 is also retracted. thereby opening the liquid discharge port 7 a little later than the effective opening of the air discharge ports, the time interval being controlled by the osition of thenut 38 on the stem of the nee le 9. The volume of the emitted air can be increased gradually by the further retracting movement of the operating lever until the latter engages a suitable stop, such as the stop screw 47 shown immediately above theneedle 2 in Fig. l. By suitably forming the tip of the needle 9 in relation to the port seat enclosed by it, l can readily Secure an increase in the .supply of liquid l with such an increase in the volume of air. Consequently, my 'appliance eau readily be used either for projecting a quite massive spray such as that needed in the rapid coating of large surfaces, or for projecting smaller quantities of spray when relatively small surfaces are to be coated, or for projecting a still more concentrated spray when spots on a previously coated surface need to be touched up.

To adapt my spray gun still further to varying requirements, I dcsirably arrange it so that the connection to the hose 2() can be made either through the valve body as shown 1n Fig. 1 or through a hose connected to'the lower end of thehandle 2. With this in mind, I provide the rear portion of the gun body with a bore 48 registering with lll-5 through the handle into a nipple 50.v It the' rear end hose connection is tombe used, this nipple is closed by acap 5l as shown in Fig. 1, but by interchanging this cap with the threaded attaching. member 52 of the hose. I can obtain the air supply through the handle so as to adapt my spray gun better for use in certain positions and for suiting the preference of certain users. By making the body of the gun Vpartly -i skeleton form, I provide convenient access to thenut 38 for adjusting this nut when desired. Likewise, by constructing the valve body as above' described, and by providing this valve body at its rear end with an easily rotated head 53,' I can readily detach the valve body, together with the valve meniber and the springs mounted in the latter from the body of the appliance, thereby making' it easy to clean these parts 'if desired. However, while lI have illustrated and described my invention. inan appliance of a pistol shape and one including various highly desirable features of construction and arrangement, I do not wish to be limited as to these, since manychanges might obvious.- ly be made without departing either from the spirit of my invention or from the appended claims.

Il claim as my invention l. In a spraying appliance, a nozzle, a

kbody member supporting the nozzle and having a bore therein and an air duct leading from the bore to vthe nozzle, a tubular valve body mounted in the said bore and having a port connecting the bore of the valve body with the said duct, air supply means connected to the bore of the valve body, and a control member slidably mounted in the bore of the valve body for controlling the passage of air from the said bore to the said port, the control member i having a plurality `oi apertures of di'erent areas respectively adapted to aline with the said port according to the position of the control member with respect'to the valve body.

2. Means for controlling the supply of air through a spraying appliance having a tubular air supply member and an air duct connected through aport to the bore of the said meinbergtlie said means comprising a hollow control member slidably mounted in the bore of the airv supply member and having its lateral wall provided with a plurality of grooves spaced longitudinally of the said members and having each groove connected by a. port to the bore of the control member, the grooves being of consecutivelyincreasing width' and the control member being movable longitudinally of the air supply member to bring the grooves selectively opposite the first named port.

3. In a spraying appliance, a body member, a nozzle mounted on the front eud thereof, the body member having a bore extending into it from ,its rear end in axial alinement with thek nozzle and having an air duct extending rearwardly from the nozzle,`

the duct leading at its rear end laterally into the said bore; a tubular valve body socketed in the said bore and having a lateral port opposite the rear end of the said duct, the valve body having the rear portion of its bore of greater diameter than the portion having the said port and having its twodiametered portions connected by an annular shoulder, and a hollow-control meinber slidably fitting the sniallerdiametercd portion of the valve body and having a head adapted to seat on the said shoulder; the control member having a chamber and a port leading from the said chamber through the lateral wall of the control member forwardly of the said head, the control member also having an outlet port leadingv` through its lateral wall from the said chamber substantially opposite the said rear end of the duct.

4f. A spraying appliance as per claim 3, i

in which the control member also has an auxiliary port in its lateral wall forwardly of the said outlet port and of larger area than the latter and adapted to be brought opposite the said rear end of the duct when i the control member s moved rearwardly.

5. Means for controlling the supply of air in a spraying appliance, comp-rising a tubu-A lar valve body having its rear bore portion of greater diameter than its forward bore portion and adjoined to the latter by an annular shoulder, the valve body having a lateral outlet port opposite its smaller diametered bore portion; and a control member comprising a stem diametered bore portion and a head tast on the stem and adapted to seat on the said shoulder,the stem having a'chamber therein and a .pair of' ports leading to the said chamber respectively adjacent to the tor- I ward face of the head and opposite the said outlet port. a

6. Air control means as per c laim e, in combination with a hose-attaching nipple mounted on the rear end of tlie valve body and a compression spring interposed between the nipple and the control member.

7 Means Jfor controlling the supply of air i slidable in the smaller diameter than its forward bore shoulder, the stem having a chamber therein and an inlet port leading to the said chamber adjacent to the forward face of the head, the stem also having a plurality of discharge ports leading from the said chamber and having their axes spaced longitudinally ol' the stem, the said ports being adapted lo be brought consecutively opposite the said outlet port when the control 10 member is moved longitudinally with re spect to the valve body.

S. Air control means as -per claim 7, in4

controlling the connection between the air supply means and the inlet port; the last named means comprisingr a slidable member provided with a plurality of apertures arranged to be selectively interposed between the inlet port and the air supply means upon movement of the slidable member to relatively spaced positions, the apertures in the slidable member being of successively increasing size longitudinally of that member in such direction that the amount of air supplied to/rhe inlet port increases as the said member is moved further and further from its inoperative position.

Signed at Chicago,` Illinois, November 4, 1925.

HARRY D. BINK l

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