US2628864A - Aerosol paint spraying device - Google Patents

Description

Feb. 17, 1953 E; ROGERS AEROSOL PAINT SPRAYING DEVICEv Filed Nov. 7, 1949 v,Mai

INVENToR. EMU/160 Foei/a5:

Patented Feb. 17, 1953 UNITED STATES TENT oFFicE AERDSQL PAINT SPRAYING DEVICE Edmund Rogers, South Euclid, Ohio, assigner to The Honor Corporation, Cleveland, Ohio, a corporation of Ohio Application November '7, 1949, Serial No. 125,917

3 Claims.

the like, by spraying the same from a can or container under pressure of a gas forming liquid by the well-known aerosol method. Gas liquid or liquid gas as hereinafter used is intended to mean a suitable gas-forming liquid propellant.

One of the problems in the use of an aerosol spray nozzle for applying surface coatings, such as paints, varnishes, and the like, is that of securing a spray of uniform nature and which will permit uniform distribution of the coating, preventing running or dripping on vertical surfaces, and also which will prevent the gas liquid from the formation of drops or bubbles in the surface being coated, whether such surfaces are horizontal or upright.

It is recognized that the causing of a whirling stream to deliver a uniform spray from spray nozzles has long been practiced with lawn sprayers, insecticide spray nozzle equipment, and the like.

Also, it is well known that due to the extremely l small nozzle opening used with containers for liquid to be delivered by gas pressure by the aerosol method, and due to the fact that the propelling gas continues to expand with the liquid delivered from the nozzle orifice, a spray of sufcient'flneness for many purposes, and with some liquids, has beenrattained with-out the necessity for extremely minute machine work which would be required to make nozzles after the fashion of larger devices such as lawn sprayers, or otherwise improve the spray by mechanical means.'

In all such aerosoll container equipment, including the valve and the nozzle, the usual merchandising involves the provision of the container with its valve and nozzle without intent for reuse. In other words, the package including the valve and spray nozzle is normally treated as a throw away or single use container. it follows that the expense of manufacture must be kept to a minimum. The parts comprising the valve and nozzle must be capable of being manufactured hyv extremely simple high-production methods, and likewise must be capable of very convenient and quick assembly,

The need for the uniform spray and for a satis- `factory valve and nozzle construction for paint spraying has heretofore not been supplied.

The present invention avoids the foregoing diftwisted wires; Figs. 3 to '7 and Fig. 9, being on the same scale, and Fig. 8 corresponding to the scale of Fig. 2.

culties and attains the highly desirable objective of a simple efficient con-struction of a spray nozzle adapted to be used with a needle valve or other cheap and convenient controlling valve, and which normally prevents clogging of the minute exit orice, while setting up in the passage within the nozzle a rapid, whirling motion of the fluid being expelled from the container through the spray orifice.

More specific objects attained are the provision of a simple whirl-creating unit, which may bel set into a straight drilled hole leading to the smaller exit orifice of the nozzle, and which when assembled with the valve remains in position without likelihood of displacement, and which :nay function effectively throughout the discharge of the entire contents of the can.

Various modifications of the device may be.

lengths for use in the nozzle;

Fig. 4 is a longitudinal section through the nozzle showing the twisted wires in position therein;

Fig. 5 is an end elevation of the same;

Fig. 6 is a View of the delivery end of the nozzle; Y

Fig. 7 is a view showing a modified form of twisted single piece insert and showing the relative position of the nozzle and needlevalve tip;

3 is a sectional View showing the valve, nozzle and can cover in which the modified form of Fig. '7 is used; l

Fig. 9 is an enlarged transverse section of the nozzle showing the use of a larger number of In my copending application, Serial No. 125,916,

vfiled. November '2, 1949, I disclosed and claimed a Method and Means for Mixing and Spraying container with the valve and spray nozzle at the tapered point of the valve 5, threaded into the,V

valve body and provided with a head 5, preferably having a slot i adapted to receive the,l edge of a coin to facilitate turning after the manner of a screw driver. l' f A packing-gland cap 3 is removably se'curedtoa threaded portion of the upper end of the body 3. Tightly fitted and secured into'a transverse opening in the valve body communicatingr withV the pasage leading from the interior is the nozzle proper I.

i which in actual size has a bore of about threesixty-fourths 'tov one-sixteenth ofan inch' in diameten'and is of a length of about three-eighths of `an1inch', or more, if desired. l

S"Tlffe valve and vnozzle are so constructed lthat they may bemade of a'miniinum amount of material andA by the simplest possible screw machine manufacturing operations.

l"Ihe"nozzle exit or spray orice l2 may be'as small as ten to fifteen one-thousandths of an inch andv is drilled through a thin forward endvwall portion i3. of the nozzle, the bore'of which has been drilleddown to that wall and terminates in a tapered'surface I i which may form a space beyond the ends of twisted wires 2i), as'shown in Fig. 4. This space'may act as a chamber in which the liquid paint or the like may 'whirl in an inwinding path at increasing speed before` being emitted from the minute orifice i2.

`As appears in Figs. 3V and 4, the twisted wires 20, whose diameter is about one-half .of the diameter of the bore 'l 5 in the nozzle, are'cut as in'- dicated by lines 22 in Fig. 3 to a length approximately that of the bore, and these short sections of twisted wire are inserted as a unit in the bore before placing the nozzle in its assembled position in the valve body.

A modied form' is shown in Figs. '7 and 8 in which the member 39 is a single, small, dat twisted `wire or like metal strip presenting helicoidal surfaces, one end of which may rest against the sloping outer portion of the bore inthe nozzle, thus providing a space in which the paint streams from along the wires may converge'in an inwinding whirl` before passing through the exitorice.

This strip 3E), or the twisted wire section 20, may be the same length as the bore of the nozzle, or less, but any such unit causing the whirling may be made slightly longer than the bore and project inwardlyltowar'd the needle valve memberv, as shown in'Figs. ,7- and 8. i

Ajfurtherillustration of a convenient form of whirl-creating unit is that shown in section in Fig.u9 where the nozzle insert Il@ comprises several twisted wires (in that case seven wires), which maybe cut from alength of small cable having anxoutside diameter permitting it to approximate.- lyt within the bore l of the nozzle lil. The aggregate space` around the wires for the passage of the paint is suflicient for creating the spray stream,but likewise each passage is small which further assures vpreventing. particles of foreign matter, hardened paint, pellets, or the like, from lpassing through the nozzle bore and clogging the spfray'orifice I2,

Obviously the twisted wire elements 20 or the element 30 will likewise tend to prevent the entry of large particles likely to clog the nozzle orifice, and under most circumstances are entirely satisfactory, but the form shown in Fig. 9 may in certain instances be more desirable.

From the foregoing description it will be seen that, with the can invertedthe liquidpaint under the gasV liquid pressure will forcibly kpass the needle valve, when opened, and flow rapidly along the spiral pathways at the sides of the twisted wires, or the element 3D, and upon reaching the .chamber beyond the end of the spiral elements,

Amist-like spray stream is emitted from the orifice i2 in the form of a hollow cone, the minute globilles' of which spread ata suitable angle, such as illustrated at S in Fig. l, and Athus coatingliquids may beapplied tothe surfaces to be covered with greatuniformity.` The likelihood of drops, bubbles, and the like, is eliminatedand heavily pig.- mented paints, metallic paints, lacquers, and the like`may be rapidly applied to the desiredfuniform even thickness.

iHaving thus described my invention, what I claim is; v l. A paint spraying device adapted for attachinentto a hand portable container arranged to be inverted to place the valve at the lower portion thereof during spraying, the contents of the container includingl a mixture ,of paint and a gasforining liquid, the. device, comprising a valve having an axial passage communicating with` the interior vof the container, a needle vvalveeiement eiitending through and closing said passageV an enlargement of the passage around the needle Ivalve element, a-nozzle member rigid with the valve body and having a cylindrical bore communicating with the enlargement of the passage andhaving a spray tip portion, the inner surface of which is conical tapering toward a central spray orice'sinaller than the bore, a helical Wire element closely fitted into said bore comprising a plurality of mutually supporting twisted wires and so cut at the outer end as to rest against the base of the conical surface and leave a space between the endl of thewire and the spray oriiice whereby uidpaint passing through the nozzle is caused to whirl along the kwire and to increase the whirling beyond the end of the same against the conical surface. Y

2.'The device described in claim 1, in which the twisted wire element is co-extensivewithrthe cylindrical bore and extends toward and is thus prevented from displacement by reason of theV inner end of the element kbeing adjacent to the needle valvevs'tem arranged in alignment with the bore. Y g

3. aeroso'lpaint spraying nvalve and vnozzle for attachment to an aerosol can having a domeshaped top and adaptedto be inverted during-the spraying, the valve comprising. a body fitted into the'tbp of the can vand having a conical surface substantially vcontinuing the dome-shaped top and havinga central passage leading from the coneshaped surface, aneedle valve member and seat therefor Vin thevalvebc'dy, an enlargement of the passage beyond the valve seat away from.

the container andithroughl which the needle valve member extends, a radial opening in the valve body, a tubular nozzle tightly tted into the radial 5 opening and having a bore opening into the passagev enlargement and having its outer end'provided with an inner tapered surface and a reduced spray orifice, a twisted wire element elosely fitted into the nozzle bore and cut to a length such as to extend the length of the bore and be retained in position by the needle valve stem within the passage enlargement.

EDMUND ROGERS.

REFERENCES CITED UNITED STATES PATENTS Name Date Tibals Aug. 8. 1922 Number 6 Number Name Date 1,727,876 Gebauer Sept. 10, 1929 1,832,570 Montgomery Nov. 17, 1931 1,941,898 Iddngs Jan. 2, 1934 5 2,126,440 Apthorp Aug. 9, 1938 2,137,786 Schlosser Nov. 22, 1938 FOREIGN PATENTS Number Country Date 10 13,130 Great Britain 1911 25,504 France- Nov. 28, 1922 (First addition to No. 540,821) 385,380 Great Britain Dec. 29, 1932 472,584 France Aug. 11, 1914

Images