USRE18813E

USRE18813E - Compbession spray gun

Info

Publication number: USRE18813E
Authority: US
Publication date: 1933-05-02

Description

I. W. P. BUCHANAN M 2, 1933, comrnrzssloiq SPRAY cu R 18,813

2 Sheets-Sheet 1 Original Filed April 12, 1929 I. 2. .Rfiuchanaw 2 INVENTOR BY w am ATTORNEY l. W. P. BUCHANAN 2 Sheets-Sheet 2 Original Filed April 12, 1929 f. E7. ffl iuchanan/ INVENTOR ATTORNEY Reissuecl May 2, 1933 UNITED STATES ISAAC W. P. BUCHANAN, OF- LEBANON", TENNESSEE- oomranssiou SPRAY- GUN Original No. 1,744,208, dated January 21, 1930, Serial at. 354,668, fii'eda rn 12, 1929'." Application for reissue filed September 22, 1931.

This invention relates to a compression spray device or gun, the present inventlo'n being an improvement over that'forming' the subject matter of an application filed by'me on'February 15, 1928, Serial No. 254,510, the

general object of the invention being to provide means whereby-the liquid is ejected by pressure as well as suction so that the'device;

will operate with the minimum amount of compressed air, this air being used to create pressure 111 the container above the liquid therein and also used to create suction in the and which last are only capable of inferior functioning. Also in addition to this firsttime-accomplished portability, only a P. motor is required, which can be attached,

without danger, to any electric lightlamp socket.

i A further object of the invention is to provide atip' having a slot therein {or producing a fan-shaped spray andto so'form the-tip and its 'slott-hat the central portion of the fan-shaped spray will be thicker than the'end portions or edges of the spray, so that the swaths of paint or thelike, sprayed on a surface by the device, can be made to overlap without'the laps being thicker than the other portions'and without causing runs;-

As will beseen, the interior walls of the 40 tip'terminate in the slit, and so converge as to produce a fan shaped spray of fixed flare limits. I

The object of my slitt-edtip is to produce a fan shaped spray and Whichso co-acts with theadjustable liquid control valve as to produce fan shaped sprays varying in width between one-half inch and sixteen inches,- or

more;

A'further object of 'the'invention is to-pro- W videan adjustable mixing chamber, with Set- Serial no. 564,703.

bilizing means for producing a homogeneous cross section of a fan-shaped spray, this-mixing 'ch'amber ermitting the air and liquid to intermingle under pressure before escaping fromthe tip, thus producing a fan-shaped spray of uniform cross section and allowing the fan shaped spray to be arranged-either vertically or horizontally.

Afurther object of the invention is to provide adjustable means for restricting the flow of air after-it has contacted-the-li'quid. Its function is to increase the volume of liquid tobe atomized. This means is especiallydesirable in connection with large stationary corttainers in which last case the needle valve 6, Figure 2, can be used.

Anotherob'ject of the invention is to provide a disk carrying a valve, the disk being located between the container and the atomizationhead-and acts to :prevent the liquid in the container from entering the head, while permitting air to enter the container from the head to place the contents-thereof under-pressure." This disk, of course-, cou'ld be integr'akwith' atomizingh'ead.

Another object of the invention is topro-' vide apressure control valvefor closing the air supply'lineto the container so that the container can be removed and filled without stopping the power plant that supplies compressed air to the device.

A still further object of the invention'is to provideadjustingscrewsin theeduction tube to?) centering the liquid tube in the-*eductiori tu e.- 5

Another object .of the invention-is to. provide a manually operated valveinterruptingthe-flow ofliquid through the liquid tube without interfering with the airflow, so that the spraying can be stopped instantly and then when the valve'is opened to permit the liquidto flow again, the same t'extureof atomization is producedas was produced'before the valve was closed, with simple means foradj'usting said valve so as to control the fineness and volume of spray.

The adjustable liquid valve for starting and stopping the flow of liquid, also gauges the amount of-liquid delivered at each trig ger operation.

This adjustment allows this valve to co-act with the slitted tip so as to produce fanshaped sprays varying in width from onehalf inch to sixteen inches or more.

Large quantities of liquid entirely fill out the fixed air contour of the fan-shaped spray, and smaller quantities of liquid fill the center, only, of this fixed air contour.

This invention also consists in certain other features of construction and in the combination and arrangementof the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding partsthroughout the several views, and in which Figure 1 is an elevation of the invention.

Figure 2 is a top plan view. I

Figure 3 is a vertical sectional view, with parts in elevation.

Figure 4 is a section on line 4'-4 of Figure 2.

Figure 5 is a section on line 55 of Figure 2.

Figures 6 and 7 are views of the valve carrying disk.

.Figure 8 is a longitudinal sectional View through said disk.

Figures 9, 10, 11, 12 and 13' are views of the tip. r In these drawings, the numeral 1 indicates a container, the neck of which is threaded to receive a cap 2, the cap being provided with a hollow dome 3 into which air is introduced from a suitable source of supply through a tube connected with the inlet mem her 4, which in turn is connected with a valve casing 5, one end of which is threaded in a hole in the dome. Thismember carries the needle valve 6, the closing of which prevents air from entering the dome. The. valvecasing 5 also carries a safety valve 7 for preventing damage to the pressure;

A depending tubular part 8 is formed at thecenter of the dome and a section 9 of a liquid tube is threaded into the depending} portion, the lower end of the section extending to a point adjacent the lower end of the container. The other section lOof the liqquid tube is threaded into a horizontal opening formed in the upper end of the depending part so that liquid can pass from the section 9 through the tubular part8 into the section 10, it being seen that the section 10 extends horizontally and at right, angles to the section 9. An eduction tube 11 surroundsthe section 10 of the liquid tube and has one end threaded into an opening 12 formed in one side of the dome and an air tube 13 connects the inner end of the opening 12 with the lower part of the chamber 14 formed by parts by excessive the hollow dome so that air can pass from the chamber 14 through the tube 13 into the eduction tube. As will be seen, the section 10 of the liquid tube passes through the opening 12 and is not in communication there with. I

The air tube 13 is provided with an opening 15 which is controlled by a set screw valve 16 threaded through a packing gland 16 in the dome, so that by adjusting the set screw valve, the escape of air into the eduction tube can be regulated. This arrangement permits the air passing to the eduction tube to be regulated from the exterior of the dome and while the device is in operation.

Itwill, of course, be understood that aft-er the valve 16 is adjusted, the same amount of air will always be passing to the eduction tube, since;the compressor is delivering the same amount of compressed air to the dome, and all of this air will pass through the tube 13 to the eduction tube. By adjusting the valve 16, the passage of the air to the eduction tube is more or less restricted, and therefore causes more or less pressure on the liq-v uid in the container. It is also observable in Figure 3 that by adjusting the tip 27, very near the end of-the liquid tube 10, the same kind of air-passage restriction would result.

The flow of liquid into the section 10 of the liquid tube is controlled by a needle valve 17 passing through a packing gland 18 in the head,'with its pointed end engaging a seat 20 against. which the inner end of the section '10 abuts. The outer end of the needle valve is threaded in the head 21 of a tubular stem 22 which is slidably arranged in the upper part of the handle 23 of the device, this handle having a horizontal part 24 at its upper end which is bolted or otherwise secured to the top of the dome. A knurled member 19 is fastened to the stem of the needle valve to facilitate turning of the same; A coil spring 25 is arrangedon the stem 22 and bears against a part of the handle andhead 21 and acts to hold the needle valve onits seat 20. A trigger 26 has its upper forked end. pivoted to the part 24 of the handle, a portionof the trigger engaging the head 21 so thatjwhen the trigger is moved rearwardly by one or more of the fingers of the hand grasping the handle 23, the needle valve will be moved to open position,

A tip 27 is threaded on the outer end of the eduction tube so that it can be adjusted toward and away from the end of the section 10 of the liquid tube which protrudes from the eduction tube. This tip is formed with a slot 28 and with a conical interior part 29 and at the point where the; slot enters the chamber formed by the conical part, a substantially elliptical opening is formed for the escape of the mixture of air and liquid so that a fan-shaped spray is produced, the center of which is of greater thickness than the ends or edges. The chamber formed by the conical part 29 provides a mixing chamber wherein the liquid passing from the section 10 oftheliquid'tube and the air 5 passing from the eduction tube can intermingle beforethe mixture escapes from the splitin the'tip. The tip is locked inadj usted position by the nut 30 whichis thread ed on the eduction tube and the gasket 31 which is placed between the-"nut and the rear end of the tip. By making the tip ornoz'zle adjustable, the slot thereincan be placed in either a horizontal or vertical position, so that'th'e spray will pass trom'the nozzle in either a'hori'zontal or vertical position.

While the drawings show the section 10 of the liquid tube passing entirely through the eduction tube. I find that this section 10 can be greatly shortened or even omitted without interfering withthe operation'of the device.

A disk 32 is placed between the neck of the container and the cap, gaskets 33'being placed between the disk and the cap and between the disk and the neck of the container to make a liquid and airtight'junction at this point, said disk being formed with an opening 34 therein which is closed by a flap valve 35 opening downwardly'so that air can en'- ter the container from the dome, but liquid cannot pass from the container into the'dome. A handle 36 is connected with'th'e disk to facilitate its removal. liquid tube passes snugly through a=hole 37 formed in the center of the disk.

A threaded projection 38 is formed on thetop of the part 24 of the handle and is designed to receive an extra tip 39 which may be substituted for the tip 27, the tips being of different sizes. Of course, more than one projection 38 can beplaced on the part 24 to receive other tips.

From the foregoing it willbe' seen that; when the inlet member 14 is connected by a hose to a source of'compressed air and the valve 6 opened, the air will enter the chamber 14formed by the hollow dome and some of this air will pass through the valve covered opening in the disk 32 into the conta iner and thus place the contents of the container under pressure. This will'tend to force the liquid in the container through the section 9 of the liquid tube, but the liquid is prevented from passing into'the section 10 by theneedle valve 17. Some of the air in the chamber 14 will pass through the tube 13 into the eduction tube so that when the trigger 26 is operated to open the valve 17 the liquid will flow through the sections of the liquid tube into the mixing chamber in the nozzle or tip, where it will'be' mixed The section 9 of the suction. The mixture of air and liquid pass ing through the slot 28 will take the-form ofia fan-shaped spray and due to the=iellipticalshape of the opening, the 'spray will be of greater thickness at the center'than at its ends or edges, so'that the swath of paint orother material being sprayed on a surface can-be overlapped without unduly-thickening the overlapping portions and without producing runs at said-portions.

If the swath: is not uniform, thetip should beadjuste'd until the'tswath is uniform This tip, with the adjustable mixing chamber formedby the tip; and the outerend of the eduction tube, will produce fan-shaped sprays'up to twenty-inches in width at'th'eordinary distance of application, and attentionjis called to thefact that while theadjustable mixing chamber is apparentlylike the sprayer, since'the hol in 'the tip is very small, the air cann'ot escape asrapidly' as it is supplied andthe consequence is that there is a greater or smaller pressure" exerted on the liquid emergingfrom the liquid tube,'an'd this liquid is therefore allowed to mix with smaller or larger quantities 0am,- thus producin'g variable atomizations. Themixing chamber in this application, however, does not allow'air' to backup and decrease the emerging liquid,- as thelong'slit in thetip permits the air to'escape.

Aswill be understood, when a largel'qu an' tity of liquid is forced through the nozzle or" tip ,the'swath will be of the maximum width, but when the quantity of liquid is decreased by the adjustment of the'needle valve, the

width of the swath is reduced as the liquidpasses from the central part of theslit and nothing but air passes from the ends-'ofthe" slit; as the air envelopes the reduced quantity of li'quid and thus this-reduced quantity of spraying through the air tube13 when thegun tilted more than usual.

The pressure control valve6 can be closed Without stopping the powerplant so that'- the container can be refilled or changed.

The section 10 of the liquid' tub'e iscenter'ed. in the eduction tube'by three'small screws-4O and byadju stin gthe needle valve 17::in'the headfilgthe'amount ofliquid passing through the liquidtu'be-can be controlled 'or regulated" when the valve is open.

This device, while adapted to agricultural and horticultural needs, is mainlyintended for the spray application of paints and lacquers and can be used with a minimum amount of compressed air and as it is of small weight, it'can be-easily carried from place to place.- As but a small power plant is necessary to furnish the air, the motor of the plant can be used with the ordinary'house current. The texture of atomization is from the faintest tint to any desired degree of coarseness.-

Therefore, we have a portable and an electric lamp socket-attachable plant'doing much faster work than competing plants that are neither portable nor' capable of being attached, for their power, tov ordinary electric light sockets. f a

The slit in the tip may be formed by a straight slot, as shown in Figures 9, 10 and 11, though it is. preferable to form it by a V- shaped slot, as shown in Figures 12 and 13.

a It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood thatchanges'may be made in the construction and in'the combination and arrangement of therseveral parts, provided that such changes fallwithinthe scope of the appended claims.

What I claim is V 1. A compression spray gun for use with a supply of air under pressure, comprising a liquid container, means for introducing com pressed air into'the container to place liquid therein under pressure, an induction tube associated with the container and through which some of the compressed air passes, ad

justable means for restricting the escape of air from thecontainer into the induction tube after it contacts the liquid, a nozzle mounted on the eduction tube a liquid tube connecting the interior of the container with the space enclosed by the nozzle and eduction tube,

and valve means associated with the liquid tube for starting, stopping, and operatively controlling the flow of liquid therethroughwithout interrupting the flow of air through the eduction tube. r

.2. A power spray gun comprising a hollow head, acontainer detachably connected therewith, means for introducing compressed air into the head, an eduction tube connected with the head and in communication'with theinterior thereof, a nozzle having an elongated slit therein associated with the outer end of the eduction tube, a liquid tube carried by the head and connecting the interior of the container with the space enclosed by the nozzle andeduction tube, adjustable means for restricting the escape of air from the container into the induction tube afterit contacts liquid, a hand operated valvefor controlling the flow of liquid through the liquid tube, a needle valve passing through the head tube,means for adjusting the valve.

3. A power spray gun comprising a hollow head, a container detachably connected therewith, means-for introducing compressed air into the head, an eduction tube connected with the head and in communication with the interior thereof a nozzle having an elongatedslit therein adjustably connected'with theouter end of theeduction tube, a liquid tube carried by the head and connecting the interior of the container with the space enclosed by the nozzle and eduction tube, ad-

justable means for restricting the escape of air from the container into the eduction tube after it contacts liquid, a hand operated valve the head, means for introducing compressed air into the head, someof this air entering the container for placing liquid therein under pressure, an eduction tube connected with the head and in communication therewith, an adjustable nozzle on the outer end of the eduction tube having an elongated slit therein forming a fan-shaped spray, adjustable means for restricting the escape of air from the container into the eduction tube after contacting the liquid in said container, at liquid tube carried'by the head and connecting the interior of the container with the space enclosed by the nozzle and eduction tube, a needle'valve stem passing through the head and when in closed position preventing thefiow of liquid through the liquid tube, means for adjustably connecting the needle valve stem to a trigger pivoted to the handle, whereby the valve' will be unseated when the trigger member is operated, and without interrupting the flow of air through the eduction tube.

5. A power spray gun comprising a hollow head, a container detachably connected therewith, an angle-shaped handle connected,

necting the interior of the container with the space enclosed by the nozzle and eduction and when in closed position preventing the flow of liquid through the liquid tube, a spring pressed slidable member associated with the handle, means for adjustably connecting the needle valve to said member, a trigger pivoted to the handle and engaging a part of the slidable member whereby the valve will be unseated when the trigger member is moved toward the handle, a Valve carried by the head for closing communication between the head and the air supply, a safety valve associated with the head, and means for centering the liquid tube in the eduction tube.

6. A spraying device comprising a container, a cap therefor, a hollow head mounted on the cap and having a space in communication with the container, an eduction tube mounted in the head and in communication with the interior of the head, a liquid tube means carried by the head and having a part extending into the container and another part extending into the eduction tube, a source of compressed air feeding into the hollow head, a partition separating the air space of the hollow head from the container 'and having an opening therein, means for controlling the openin whereby air can pass from the head into the container to force liquid therein to the eduction tube and whereby liquid is prevented from passing from the container into the head, and means for causing air passing through the eduction tube to act on the liquid emerging from the liquid tube, comprising a nozzle on the fore end of the eduction tube.

7. A spraying device comprising a container, a cap therefor, a hollow head mounted on the cap and having a space in communication with the container, an eduction tube mounted in the head and in communication with the interior of the head, a liquid tube means carried by the head and having a part extending into the container and another part extending into the eduction tube, a source of compressed air feeding into the hollow head, a partition separating the air space of the hollow head from the container and having an opening therein, means for controlling the opening whereby air can pass from the head into the container to force liquid therein to the eduction tube and Whereby liquid is prevented from passing from the container into the head, and means for causing the air passing through the eduction tube to act on the liquid emerging from the liquid tube, comprising a nozzle on the fore end of the eduction tube, said nozzle having an elongated slit therein to produce a fan-shaped spray.

8. A compression power gun for producing a fan-shaped spray, comprising a liquid container, a means for introducing compressed air into the container, an eduction tube associated with the container and through which the compressed air passes, a slitted nozzle mounted on the eduction tube, having its interior walls terminating in the slit and so converging as to limit the flare of the fanshaped spray, a liquid tube connecting the interior of the eduction tube with the container, a valve for controlling the flow of liquid through the liquid tube, whereby the flow of liquid is started and stopped, and means for adjusting the valve to regulate the quantity of liquid passing through the nozzle, whereby the valve co-acts with the nozzle for producing fan-shaped sprays of varying widths.

9, A compression power gun for producing a fan-shaped spray, comprising a liquid container, a means for introducing compressed air into the container, an eduction tube associated with the container and through which the compressed air passes, a nozzle having an elongated slit therein, and associated with the outer end of the eduction tube, aliquid tube means having a part extending into the con tainer and another part extending into the eduction tube, a valve for controlling the flow of liquid through the liquid tube without interrupting the flow of air through the eduction tube, whereby the flow of liquid is started and stopped, and means for adjusting the valve to regulate the quantity of liquid passing through the nozzle, whereby the valve co-acts with the nozzle for producing fanshaped sprays of varying widths.

ISAAC W. P. BUCHANAN.