US1220942A - Spraying apparatus. - Google Patents

Description

F.'F.\BRADLEY.

SPHAYING APPARATUS.

APPLICATION mio ocr. I. 1914.

1,20*,94., Patented Mar.27,1917.

F53 'f Z5 17 j fin J3 m23 @1 [23 Z0 A s /g l FRANKLIN F.` BRADLEY, F CHICAGO, ILLNOS, SS'IGNGR T BRATS'LEY 55 VRGOMAN COMPANY, OF CHICAGO, ILLINOIS, A CRPGRATN @E ILLINOIS.

SPRAYING APEARATU.

To all whom t may concern.'

it known that l, Faxnumn F.' BRAD- LEY, a citizen of the United residing at Chicago, in the county of Cook and State of illinois have invented a certain new and useful improvement in Spraying Apparatus, of Vwhich the following is a full7 clear7 concise and exact description, reference being had to the accompanying drawings, forming a part of this specification.

lily invention relates to spraying devices and is of particular service in the formation of spraying devices that are adapted to the distribution of paint, varnisha etc.

rlhe invention has for one of its objects the provision of a spraying device that is adapted to the production of a spray oi' atomized liquid that is much more evenly distributed throughout the spray than Was hitherto possible with prior devices. ln practising this feature of my invention l employ a plurality7 say tivo9 substantially parallel c ollocated spraying nozzles adapted to the production of tu'o sprays which vare preferably initially distinct but which, oufing to the collocation of the nozzlesa are intermingled to eii'ect the desired distribution of the atomized liquid in that portion of the combined spray vvhere application of the atomized liquid is to be effected.

The invention has for another of its objects the provision of an improved mechanical construction of spraying nozzles7 and for another of its objects the provision of improved means taking part in eiiiecting the discharge of the liquid.

li ivill eXplain my invention more fully by reference to the accompanying drawing showing preferred embodiments thereof ami in auch Figure l is a side view of a spraying device constructed in accordance with my invention7 parts being shown in section, the association of the spraying device Xvith the air pressure tank and a source f liquid supply being diagrammatically indicated; Fig. 2 is a sectional plan Viewon line 2 2 of Fig. 3; Fig. 3 is an illustration similar to a part of the illustration contained in Fig. l but on a larger scale; Fig. 4iis a sectional View on line l a of Fig. 3 and Fig. 5 illustrates a modification.

Like parts are indicated by similar characters of reference throughout the different gures.

Referring first more particularly to the A Specification of Letters Patent.

Application filed ctober 7, 1914.

Patented Mar. 27, 191'?.

Serial No. 865,487.

construction shown in Fig. l and to the views which illustrate characteristics that are common to the structures of Figs. l and 5, l have illustrated an apparatus which includes a pressure tank l that may contain air having a normal pressure of siXty pounds per square inch. rlhe outlet tube 2 of this air tank is connected by a flexible hose 3 with a rigid tube eithat is carried by a suitable handle 5. A tank 6 contains the paint7 if'arnish or other liquid (illustrated at 7) which the atoinizer of my invention is to diiuse in the form of a spray. An air inlet tube 8 carried by the tank 6 serves to connect a flexible air hose 9 'sith a rigid tube l0 also carried by the handle (i. fin outlet tube il is connected by flexible hose or pipe l2 'with the rigid pipe 13 that is also carried by the handle 5. The air pipes l and l() are adapted for communication at their upper ends when the valve le is opened consequent upon depression oi the thumb head lo of the valve la, at which time airis also supplied under pressure to the air pipe lo which extends to the spray nozzle structure illustinted at 17, the liquid conveying pipe 13 also extending to this structure. i check valve 18 is located in the pipe l0 and permits the flou' of air under pressure through pipe l0 to the tank 6 for the purpose of forcing liquid from this tank through the pipe i8 to the nozzle structure i7. lVhen the apparatus is out of action, at which time the valve l is closed, back pressure of air through the pipe will force the check valve i8 shut so that there is no iovv of air under pressure through the pipe lll whereby a desired degree of air pressure may be maintained upon the liquid in the tank 6 to enable the immediate flou7 of liquid from this tank when the valve la is reopened. l do not limit myself to the use of ordinary tubing for the air and liquid' conveying ducts.

The nozzle structure which l prefer to employ with the apparatus above specifically described forms another part of my invention but equipment which l have specifically described for effecting the discharge of liquid that is to be sprayed is not to be limited in its association to the preferred form of nozzle structure. ln accordance With this feature of my invention the nozzle head includes in its formation a block of metal 19 'which as tWO substantially parallel bores 2O iro . one end of the nozzle head, these bores being i Vin the nozzles 22.

normally closed at the latter end of the nozzlehea'd by separate screw caps or closures 201, 211 in threaded engagement with the nozzle head to enable them to be cleaned. The liquid lp'ipe 13 communicates with the bore 20 and the air pipe 16 communicateswith the bore 21 whereby liquid and air are respectively supplied to these bores. Two parallel collocated tubular liquid edueting nozzles Q2, terminating at the front end of the nozzle head, are passed diametrically or transversely through the bore 21 into communication with the boreV 20 whereby liquid may be discharged from the bore 2O through the nozzles 22 which extend longitudinally of the nozzle head. Annular spaces 23 surround the nozzles 22 and intervene between the same and the nozzle head 19, these spaces being sufiiciently limited to enable the air to issue from the bore 21 therethrough with sufficient force irst to draw the liquid through the nozzles 22 and thereafter thoroughly atomize the same.

In the form of the invention illustrated in Fig. 5 the liquid tank 6 is replaced .by

kthe liquid tank or receptacle 24 which is mechanically coupled with the pipe 13 by means of the set screw 25, the pipe 10 and the Vcheck valve 18 being omitted in this arrangement. In the structure illustrated in Fig. 1 the liquid is not only withdrawn due to the air which is flowing under pressure through the annular spaces 23 but is also withdrawn due to the pressure upon the liquid in the tank 6 whereas in the structure of Fig. 7 there is n0 artificial pressure upon the liquid in the receptacle 24s, total reliance .being placed upon the air flowing through the spaces 23 to effect the flow of liquid By means of the nozzle structure described and the parts correlated therewith outwardly flaring conical streams of atomized liquid are produced. As is well known by those skilled in the art the atomized liquid is denser at the axial portions of the separated parts of thc two conical streams so that if but one nozzle were used alone the atomized liquid would not issue from the apparatus in a well distributed condition. By employing two nozzle structures the conical streams ofatomized liquid merge a suitable distance therefrom, the particles of the two streams intermingling and bombarding each other to effect a redistribution which is substantially even at any right section of the composite stream.

While I have herein shown and particularly described preferred embodiments of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patent the following An atomizer provided with a nozzle head having two substantially parallel bores arranged transversely of the nozzle head and each extending to one end thereof, one of these bores being for communication with a source of liquid to be sprayed and the other for communication with a source of air under pressure; a separate screw cap for each of these bores at the end of the nozzle head to which such bore extends and in threaded engagement therewith; and a nozzle tube extending longitudinally of the nozzle head and terminating` at the front end of the nozzle head and extending through the latter bore into communication with the other bore, there being space at the exit end of the nozzle tube intervening between this tube and the nozzle head, this space affording communication between the air conveying bore and the exterior of thc nozzle head.

In witness whereof, I hereunto subscribe my name this 30th day of September A. D.,

FRANKLIN F. BRADLEY. Witnesses:

ESTHER MCLOUGHLIN, FRED J. HUnTz.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C.

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