US1655254A

US1655254A - Flat-spray appliance

Info

Publication number: US1655254A
Application number: US155465A
Authority: US
Inventors: Melvin J Binks
Original assignee: BINKS SPRAY EQUIPMENT CO
Current assignee: BINKS SPRAY EQUIPMENT Co
Priority date: 1926-12-17
Filing date: 1926-12-17
Publication date: 1928-01-03
Anticipated expiration: 1945-01-03

Description

Jan. 3, 1928.

M. J. BlNKS FLAT SPRAY APPLIANCE Fil ed Dec. 17. 1926 Patented Jan. 3, 1928. UNITED STATES PATENT OFFICE.

MELVIN J. BINKS, OF OAK PARK, ILLINOIS, ASSIGNOR TO BINKS SPEAY EQUIPMENT 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FLAT-SPRAY APPLIANCE. Application filed December 17, 1926. Serial No. 155,465.

My invention relates to spray appliances throttle the flow of air and to interfere with of the general type in which a rejected a cleaning of these passages; and in which stream of liquid is flattened by t e action the narrow air outlet portions connect diof opposed and forwardly intersecting rectly to air chambers of such large capacity lateral air jets, so that the resulting spray as to permit a. reduced operating pressure 60 is spread out in a somewhat fan-like form. to be employed effectively.

appliances of this kind, commonly Still further and also more detailed 0bmarked in hand manipulated forms known JGCtS will appear from the following specias spray guns for: use in applying liquid iication and from the accompanying drawcoating materials,difiiculties have heretoings, in which or fore been encountered. ig. 1 is a central, vertical and longitu- First, departure from a proper alining of dinal section through the forward portion the parts through which the liquid and the of a spray gun embodying my invention. air are projected. To insure uniformity of Fig. 2 is a front elevation of the same the resulting spray, the initially projected forward portion. 70 cylindrical stream of liquid is commonly Fig. 3 1s a rear elevation of the air nozzle. sheathed by an initially cylindrical tube of Fig. 4 is a side elevation of the liquid air. If the parts between which this tubular nozzle. sheath of air is projected are not concentric, Fig. 5 is a section, similar to a forward the sheath will vary in thickness, thereby part of Fig. 1 but showin another embodi- 5 causing corresponding variations in the ment, namely one in whic the grooves for atomization. So also, if the axis of the inisupplying air to the tubular air outlet are tially projected cylindrical stream of liquid formed in the liquid nozzle. does not bisect the angle between the con- Fig. 6 is a front elevation of the liquid verging lateral air jets, the desired uniformnozzle of the embodiment'of Fig. 5 ity of atomization cannot be obtained. Referring first to the embodiment of Figs. Second, the passages for the lateral air 1 to 4 inclusive, Fig. 1 shows the forward jets have commonly been diflicult to keep portion of a spray gun body 1 which has clean, owing to the collecting of the liquid a longitudinal liquid passage 2 connected to paint or the like in them when the spraying a liquid inlet Ipassage 3, and which also has operation i di ti d, a longitudina air supply passage 4 formed Third, the necessarily small diameter of in it. The liquid passage 2 connects at its the discharge portions of the several air pasfOIWaId end with the bore 5 of a liquid sages has cooperated with the usual smallnozzle 6 which has aliquid outlet 7 of condiametered and bent forms of the passage e ted dlameter, the flow of liquid through ortions leading to them, goes to throttle this outlet being controlled in the 1181131 the fiow of air and require a wastefully high manner y a o gi y movable needle air pressure to be maintained for operating Y lY 8- The iquid nozzle is here shown as such spray appliances. initially constructed separately for con- 40 y present i ti i t id a venience in manufacturing and as threadedly imple head construction for spray guns connected to the body 1, SO that this body which will simultaneously avoid all three of and the 11 111d IIOZZle g h r m a rigid the above recited objects and which also y will be easy to manufacture without requir- The llqllld I10ZZ le has a relatively long and 45 ing a degree of accurac beyond that obtainforwardly p fruslio-conical OItiOII able in ordinary brass li nishing'shops. More fitting the r a wardly flaring bore 0 an air particularly, my invention provides a nozzle 9, and this air nozzle has a cylindrical struction in which the air nozzle seats upon Central per re Thi perture iS larger the liquid nozzle so as to insur a proper in bore than the outside diameter of a tuo0 alining of these parts; in which these nozzle bular liquid nozzle tip 11 in which the liquid are retained in position by a clamping and Outlet 7 is bored, sodas to Provide an interair confining collar which permits the said vening annular space 12 between the parts 10 arts to shift somewhat with respect to the and 11, through which space the tubular ody of the spray gun; in which no smallsheath of compressed air is projected. 55 diametered air passages have any bonds to The air nozzle 9' is held tightly upon the [of which extends liquid nozzle by a collar 13 which has its forward end contracted to form'an annular flange 14 engaging the forward face of a peripheral flange 15 on the air nozzle. This flange 15 is somewhat smaller in diameter than the bore .of the collar 13, and the air nozzle also has a cylindrical portion 16 ex-' tending forward from its peripheral flange 15 and fitting the bore for the collar flange 14. The collar 13 is thickened at its rear end to afford an outwardly directed radial flange 17 which bears rea'rwardly against the forward end of the gun body 1, and this flange is clamped against the said body by a clamping ring 18 which is threaded on the body 1 and which has its forward end contracted to form a clamping flange 19 engaging the forward face of the flange 17 on the collar. The rear collar flange 17 is smaller in diameter than the bore of the clamping ring 18, so as to permit a shifting of the axis of the collar with respect to the gun body, thereby allowing for departures from an exact alining of the axes of the collar and of the two nozzles with respect to the axis of the liquid passage 2.

The part of the air nozzle behind the peripheral flange 15 is considerably smaller in diameter than the said flange, thereby providing a lar e annular air chamber 22 into which the air supply duct 4 opens. Leading to this air chamber through the air nozzle are two straight air outlet ports 20, each through a lug 21 which projects forwardly beyond the collar. These orts 20 have their axes in a common plane with the axis of the air nozzle (and hence of the annular air outlet 12) and the two port axes converge forwardly so as to intersect at a common point 40 on the axis of the air nozzle, as indicated by dotted lines in Fig. 1. I

To connect the air chamber 22 with the annular air outlet 12, I provide longitudinal grooves in one of the tapering surfaces which aflord the interfitting seat portions of the two nozzles, as by providing grooves 23 in the bbre of the air nozzle.

With a spray gun head thus constructed, the fitting of the tapering bore of the air nozzle on the corresponding taper of the liquid nozzle-both of which tapers can easily be machined to uniform angles--insures an accurate alining of the walls of the annular air outlet 12, while the fitting of the collar flange 14 upon the air nozzle seals the lif the threading of the {pint between these.

iquid nozzle is not concentric with the threaded connection of the clamping ring to centric with the clamping ring,

the body, the collar 13 may not be conbut the two nozzles will still be accurately alined without preventin an adequate sealing of the collar to the air nozzle and to the gun body.

Likewise, a lack of alinement of the liquid nozzle with the bore of the liquid passage 2 is immaterial, as the length of the needle valve will permit the latter to spring sufiiciently for tightly closing the liquid outlet.

By making the rear portion of theair nozzleconsiderably smaller in diameter than the bore of the air confinin collar 13 I provide a large air storage c amber 22 through which the air for the flattening jets is supplied by straight ports which are easily drilled and easily kept clean. This large air chamber, together with the plurality of grooves 23 (which have a total cross-section many times greater than the area of the annular air outlet 12) effectively prevent any material throttling of the air, so that the air pressure required by my spray gun is I much lower than that needed with the types heretofore in use.

However, I do not wish to be limited-to the details of the construction and arrangement above described, since changes may obviously be made without departin either from the spirit of my invention or rom the applended claims. For example, Figs. 5 and 6 s ow parts of an embodiment in which the air supply grooves 23 are formed in the tapering exterior of the liquid nozzle 6 while the air nozzle 9 has its rear and major bore portion of a simple frustroconical form.

I claim as my invention:

1.In a flat spraying appliance, a body having a liquid passage and an air passage open at its forward end, a liquid nozzle extending forwardly from the body and having its bore connected to the liquid passage, the liquid nozzle having a tubular tip and a rearwardly' flaring conical portion behind the said tip; an air nozzle fitted upon the said conical portion and having an outlet bore freely housing the said tip to provide an annular air port therebetween; the air nozzle having a geripheral flange and a smaller diameters annular portion forwardly of the flange, forwardly converging ports extending through the said flange and opening radially inward of the annular portion; and a collar detachably secured to the body and having its forward end contracted to form an an= nular'flange fitting the said annular portion and engagin the said peripheral'flange to clamp the air nozzle on the liquid nozzle; the part of the air nozzle behind the peripheral flange being smaller in diameter than the bore of the collar to aflord an annular air space into which the air passage opens and from which the converging ports lead; there being a passa e leading from the said air space to thesaid annular port.

2. A flat spraying appliance as per claim 1, in which the last named passage coinprises a groove formed in one-of the said nozzles and extending along the said conical portions of the two nozzles.

3. A flat spraying appliance as per claim an annular air chamber therebetween, the 1, in which the collar abuts rearwardly air nozzle having forwardly converging air against the body and has a peripheral flange, ports extending through the said larger and in which the collar is secured to the 'diametered portion from the said air chambody by a ring threaded upon the body and her to the front of the air nozzle, the air having an inwardly directed flange engagnozzle having a central forward part freely ing the front of theperipheral flange on housing the tip of the liquid nozzle to prothe collar; the bore of the inwardly directed vide an annular port th'erebetween, there be flange being larger in diameter than the ing air passages leading from the said air 10 part of the collar housed by it, and the bore chamber to the said annular port; the air of the ring being larger than the outside nozzle and liquid nozzle being formed to diameter of the peripheral collar flange, so afford an annular chamber around the rear as to permit a shiftin of the axis of the portion'of the liquid nozzle tip and in front collar with respect to that of the ring. of the liquid nozzle part upon which the air 15 4. In a flat spraying appliance, a body, a nozzle is fitted, so as to provide an annular liquid nozzle projecting forwardly from the space opening into the said annular port and body and having a forward tip of reduced forming a portion of the said air passages, diameter, an air nozzle fitted upon a part of the said air passages also including grooves the liquid nozzle and having a forward porformed in one of the nozzles leading from 2 tion of larger diameter than its rear porthe said air chamber to the said annular tion, a collar secured to the body and fitting space adjacent to the interfitting parts of apart of the air nozzle forward of the rear the two nozzles.

face of the said larger diametered portion, Signed at Chicago, Illinois, December the latter portion being smaller in diam- 14th,1926.

- MELVIN J. BINKS.

25 eter than the bore of the collar toprovide