US2194339A - Spraying device - Google Patents

Description

March 19, 1940. M, V EL 2,194,339

SPRAYING DEVICE Filgd Dec. 13,. 1938' INVENTOR Patented Mar. 19 I UN T-E (S AT PATENT OFFICE This invention. relates "to spraying devices of the characteremployed for the distribution of 'liquid insecticide, and such as is shown in my I co-pending application, Serial No. 220,041, filed July 19, 1938,- 'an'd the objectxof the present invention is to improve the spraying results; to

prevent clogging'of the air blast and spray openings, and to imparta rotative or swirling action to the air streamland particles of liquid carried thereby. p

In certain types of sprayers of the character mentioned, a retractive movement of the piston tends'to draw liquid into the piston chamber.

While this is prevented in sprayers of relatively expensive or intricate construction through; the use of valves, thepresent invention contemplates the provisionfofa simple and less expensive means by which this undesirable characteristic may be prevented, The invention has therefore,

as one of its objects, the provision of means by which the flow of liquid into the air chamber on retractive movement of the piston is eliminated.

In theac'companying'drawing, wherein an embodiment of the invention is shown, Fig. If is a a sectional view through a spraying device of the improved construction, the section being taken on the line I--I of Fig. 2; looking in the direc-- tion' of the arrows; Fig. 2 is a front elevation of the, same; Fig. 3 is an enlarged sectional view through the spray nozzle; Fig. 4 is a front elevation of the apertured cap at the end of the piston chamber;- Fig. 5 ma sectional View on-the' line 5 -5 of Fig. 4, loiokingz'in :the direction of. the arrows; and Fig. 6 is a' front elevation of the cap with a modified formrof opening provided therein. I

In the drawing I indicates the piston-chamber of the sprayer;the same being of the conventional cylindrical form, and generally composed of a rolled-up section of sheet metalhaving its longitudinal edges seamed together. Mounted for reciprocation within'the cylinder I is a piston {ofconventional form, thesame being'fastened to oneend of a piston rod 3 which extends out of the rear end of the piston'chamber or cylinder I; usually through an opening formed in a.

' pluglocated in that end." The projecting end of ,the rod' 3 terminates in a handle, not shownlbut of conventional form, to enable, the piston to .be

reciprocated in the manner wellknown sprayer construction.

.The forward end of the cylinder I is closed by a cap member Shaving its marginal edge seamed at'la to, the end of the cylinder I, said cap being Cal formed with a forwardly extending cylindrical cupportion 4 having a front end or wall 5. provided with three spaced arcuate depressions I located around a central protuberance 8 through which a spray opening 9 is formed.

Fitted within the cap member 6 and held therein by frictional fit or by any other suitable means is a cup-shaped member or inner cap It provided with a forwardly extending nose I I of a diameter less than the internal diameter of the cylindrical cup portion 6 so that an annular chamber I4 is annular chamber I4 is a siphon tube I5 which extends upwardly'from within the liquid supply in the conven- I tank 29 secured to the cylinder I tional manner. p The nose portion II of the cup-shaped member I0 has its front wall I8 formed with an air blast formed within the cup-shaped member 6' be. tween the inner face thereof and the protruding nose portion II of'member I0. Entering into the opening I3 preferably located in alignment with the sprayopening 9, the spray opening being preferably of larger opening I3; I I

diameter than the air blast It is desirable that the space 20- between the front wall I8 of the nose II and the front Wall 5jof member 6 be definite and of unvarying size and of less width than the width of the annular chamber I whereby the amount of liquid ejected P out of the spray opening 9 will be regulated. The "fixed spacing of thesetwo walls on the members 6 and I I is governed by means of fixed stops provided by the inner faces of the arcuate depressions I. Thus,'when the cup-shaped member It! is pressed or otherwise secured in position within .member 6, as shown in Fig. 1, the front ofthe nose portion II coming into contact with the inner faces of the depressions I wil-llimit the extent to which the member I!) may be'inserted within member 6 and at-thevsametime act 170135.

The arcuate depressions l are spaced from one another by pressed out-ribs 2I (Fig. 3) which radiate from theprotuberance 8 and form at their sages which connect theprotuberance 8'with the annular chamber I4. Liquid is drawn through these channels from chamber It to the spray" opening, the number and size'of these channels Pressed within the nose portion 23 and a circumferential wall 24, the latter fitting tightlywithin the nose portion I I, as

indicated in Fig. 1, and frictionally holding the "cup in. place and locating the wall portion 23 at 'adistance from the front Wall I8.of theinose. The' cup 22; which is shown in detail in Figs. 4 "and 5, is formed with several apertures 25' which are produced by slitting the wall 23 and distort ing portions of the wall adjacent the slits to'pro+ "positivelyspace the wall It of'member II a defiv nite distance away fromthe front wall 5 of membar 6.

.inner' or concave sides radial channels or pas- I serving also to regulate the supply of liquid to 'the spray opening. I i I Q portion 1 i of the meml ber II) is a'cup 22 having an apertured plate vide a tapering passage or hood 26 near each slit.

In operation, movement of the piston in a direction toward the wall 22 will cause the air displaced by the piston to be forced through the passage 25 and out through the openings 25 with a swirling motion, the air so directed passing through the air blast opening it, drawing liquid through passages 2i and ejecting it in a swirling fine mist out through the spray opening 9. Upon retractive movement of the plunger it has been found that while a small amount of liquid might, possibly be drawn through the air blast opening it into the space within the nose i 5- between the wall it and plate 23, the liquid will not be drawn through the apertures 25 and into the piston chamber, and any liquidHin-said space will be blown out on the following forwardmovement oi the piston.

"While the particular formation of apertures 25 and accompanying tapered passages 25 has been found especially effective in imparting-a swirling movement of air forced throughthem' and also effective in preventing liquid from being drawn into-the piston chamber, other forms'jof apertures in the plate 22 might be equallyas efiective. For example, inFig. dthe cup 22 is shown as having its plate portion 23 formed with a plurality of small holes Bil which break up the air stream, causing a swirling motion of the same within the, nose portion H and also preventing liquid to be drawn into theinside of the piston chamber. Various other modifications may also be made without departingfrom the spirit of the invention.

What I claim is: v A LA sprayer having an air cylinder, a piston mounted for reciprocating movement therein, a closure cap disposed over one endoi said-cylinder, said closure cap having a forwardly extending nose portion, said noseportion having a centra'lly located spray opening, aqcup member fittedof the cup being formed with angularly disposed passages leading to openings formed through said closed end.

2. A sprayer having an air cylinder provided with a closure cap at one end, an inner cupmember fitted within the closure cap, the inner cup-member having a projecting portion extending within the closure cap nearto therea'r face of the front end of said cap, the shapes of said projecting portion and closure cap being such as to form an annular chamber between them, spaced projections formed on thefront end of the closure cap and projecting inwardly therefrom and in' abutment with the front end of the projecting portion of the cup-member, aligned openings through the closure cap and cup-member, said openings constituting aspray opening and air blast opening respectively, and

radial passages formed in the front end .ofithe closure cap between the projections thereon, said closure cap and cup-member.

3. A sprayer having an air cylinder, 'a piston I 'passages connecting the annular mounted for reciprocating movement therein, a

closure cap disposed on one end of said air cyl inder, a cup-member fitted within the closure cap, said cup member having a, forwardly extended reduced portion provided with a front end extending close-t0 the front. end of the'closure cap, the shape of said forwardlyextended portion of the cup-member being such as to form 5 v,

an annular'chamber between it and the'c-losure .cap, a liquid-supply tank supported by the cyli'nder, a siphon tube-extending from within the tank andcommunicating with the annular chamber,the front end of the cup member being provided with an air-blast opening, the front endv of theclosure cap having aspray opening, and

the front end of the closure cap having radial the spray opening. H i Y chamber with, a

extending within the closure cap and so shaped as to form an annular liquid-siphon chamber I between itself andthe closure cap, a communication between said chamber and a source of; liquid supply, said nose portion being provided with an end wall located adjacent to the front: end wall of the closure cap, "the .nose portion of the inner cap belngprovided'with an air blast. opening located in proximityto'the spray opening,. and a cup-shaped member located-Within the nose portion and provided with'a plurality of openings extending through it.

A sprayer having an airgcylinder, a pis'ton; mounted for reciprocating -.movement therein, a.

closure cap extending over one" endof the cylinder, a cupmember nested within the; closure cap tween it and the closure cap, a communication between said chamber and a source of liquid supply, closure cap having a spray opening, the

cup member having'an air blast opening, and-a separating member of cup form fitted within-the *cup member and ,disposed between the piston and the air blast opening, 'said separating memher being provided with a plurality of) hooded 50 openings thehood's extending over said openings being angularly disposed with "respect to one another. v I

6, A sprayer. having'an air cylinder, a pistonmounted for reciprocating movement therein,l a

"closure cap extending over one end of said cylinder, said closure cap having a forwardly extending nose portion provided'witha centrally located shaped so as to form an annular chairiberbetween 1tself' and said nose portion, a communie ,"cation between said chamber and a source of liquid supply, said cup memberhaving an air blast opening extending throughiit inproXimity to the spray opening, a cup nested within the cuomember and -co-operating therewith the formation of achamber within the cup member, said cup having a wall interposed between the,

piston and the air-blast opening, said wall hav ing a'plurality of openings-all of which are dis" aligned with the air blast opening.

Wmm-At/IMARTIN meet." t

as L

i0 and shaped to form an annular chamber be-

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