US1864188A - Spraying device - Google Patents

Description

June 21,1932. 5. DEUYTSICH 1,864,188

SPRAYING DEVICE Filed June 25, 1928 2 Sheets-Sheet c5275 454 57 .54 :5 50 24 T4 42 W 5 zg, l7 4/ C 4 552 7 I I o G 4 40 {i i: 5,? Z /4 ATTORNEY v be ejected, as for Patented June 21, 1932 UNITED STATES PATENT OFFICE SIMON DEUTSCH, OF SOUTH BEND,

INDIANA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE ELECTRIC SPRAYIT COMPANY, OF SOUTH BEND, INDIANA, A CORPORATION OF DELAWARE SPRAYING DEVICE Application filed June 25,

The principal object of this invention is to improve a hand portable spraying unit, which comprises a handle for manipulating the entire unit; an electric motor; an air compressor; a nozzle; and a refillable reservoir for containing the liquid to be sprayed. More particularly, an object of the invention is to provide such a unit which is capable of '-praylng substantially any kind of liquid, including those which tend to gum, fill or clog up the spray nozzle, particularly during periods of rest or cessation of operation for the unit.

A further object is to provide a device of this character in which means are provided for permitting an efiicient control to be had for starting and stopping the spraying action substantially instanter without stopping the motor which supplies the air pressure for ejecting the fluid from the sprayer, thereby avoiding the delay in starting and stoppin the spraying action when controlled by the motor per se, and reducing the waste of material to a minimum, especially in the movement of the sprayer from one point to another, in which case it is now common practice to permit the sprayer to operate during such movement owing to the relatively slow starting and stopping operation of electric motors.

A further object resides in the provision of air under pressure for forcing the liquid from the container into the nozzle chamber, and means disposed within the chamber with relation to which'a nozzle tip is adjustable, whereby an air stream diverted through the chamb r is given a whirling action adjacent the tip end of the nozzle for breaking up the liquid stream into a spray before ejection thereof through the nozzle tip, and by the adjustment of which nozzle tip with relation to the means for producing the whirling of the air stream, a fine solid liquid stream may use in outlining a figure or for striping purposes, or the atomization of the liquid by the air stream varied to con trol the density of the liquid ejected.

A further object of the invention resides in the provision of a unitary fluid spraying system adapted to be carried and directed 1928. Serial No. 288,162.

with one hand by means of a handle provided, and means within reach of the fingers of the carrying hand for controlling the operation of an electric motor and the supply of air furnished by an air compressor driven by the motor to the container of the fluid.

A further object resides in the arrangement of a motor, a rotary compressor, and a fan driven by the motor, whereby a current of air is produced through the motor casing for aircooling the motor and the compressor, thereby permitting the use of a high speed motor and air compressor without danger of over heating, and minimizing the amount of lubrication ordinarily required for said parts.

With the above and other objects in View, the invention resides in the particular combination and arrangement of parts as will be more fully hereinafter set forth, described and claimed, it being understood that various modifications may be made in the structure as shown and described and falling within the scope of the claims, without departing from the spirit of the invention.

In the drawings:

Figure 1 is a view elevation.

Figure 2 is a top plan view of the device.

of the device in side Figure 3 is a fragmentary side elevation I of the device showing part of the device in section and part of the device removed to show the air compressor.

Figure 4 is a sectional view taken on line 44 of Figure 3.

Figure 5 is a side view of rotor.

Figure 6 is an edge View of the compressor rotor.

Figure 7 is an end view of carrying member.

. Figure 8 is a side view of the ejector member, also showing the nozzle tip in cross section.

Referring now more particularly to the accompanying drawings, the numeral 1 designates an electric motor of well known construction, and which is controlled by a switch (not shown) which is in turn actuated through the medium of a finger trigger 2 for the compressor the ejector ber 24 through dlagonal starting and stopping the operation of the motor, all as is now common practice in the art.

The motor is mounted upon a handle member 3 by means of which the sprayer is handled, and which carries the switch trigger 2 conveniently located to be actuated by one of the fingers of the hand while gripping the handle. The motor consists of a casing 4 housing the usual parts of a motor as the armature 5, the poles 6, commutator 7 and brushes 8, the casing being provided at'its outer end with a cap 9 having openings 10 therein, which openings are supplied with fine screening 11 to prevent foreign matter from entering the casing, but permitting air to freely pass therethrough for the purpose of cooling the motor parts. The opposite or inner end of the motor casing 4 has integrally formed therewith a compressor or pump chamber 12 which is circular in form, and the axis of which is eccentric with relation to the axis of the armature shaft 13, and

which shaft extends into the compression J chamber 12, and mounts a rotor member 14 keyed to said shaft. Said rotor member 14 is provided with a series of tangentially disposed slots 15, in which are freely and slidably mounted piston blades 16 adapted to be thrown outwardly by centrifugal force to maintain the outer ends thereof in contact with the eccentrically disposed inner periphery of the compression chamber 12, thus forming a rotary air pump or compressor, the air being taken in through the port 17 and expelled through the port 18 to the other parts of the device. The compressor chamber 12 is supported in spaced relation with the motor casing by means of the fins 19, between which air drawn through the motor casing by means of a fan 20 mounted on the armature shaft 13 is discharged to the atmosphere, thereby absorbing heat from the fins and serving to prevent the air compressor or pump from becomingoverheated, and at the same time air cooling the motor.

Suitably mounted on the motor'casin 1 is a casting 21, provided with a cap mem er 22 having internal screw threads adapted to receive the upper end of a container 23 in which the liquid to be sprayed is placed. Said casing is provided with a chamber 24 extending longitudinally thereof, and with a bore 25 intersecting said chamber, and which bore aligns with a threaded tap 26, which in turn opens into a smaller bore which forms the port 18, through which air discharged by the air pump enters the chamthe bore 28 and aperture 29 of the bolt 30, which, as shown, serves to attach the casting 21 to the motor casing 4. The casting 21 is provided with a port 31 provid4 ing communication between the chamber 24 and the container 23, and through which air under pressure is built up in the upper part of the container to force the contained 1i uic upwardly through the tube 32 exten ing downwardly into the container, and the upper end of which tube is in communication with passages in member 33 as explained hereinafter.

Disposed Within the chamber 24 in fixed relation therewith is a member 33 recessed at 34 which overlies the port 31 to permit air from the pump to enter the container, and which member 33 is provided with laterally and upwardly extending longitudinal ribs 35 which engage the inner wall of the chamber 24 for supporting said member therein, and which ribs and the wall of the chamber form passageways through which air from the pump also passes to the forward or discharge end of the nozzle portion of the device. The member 33 is provided with an axial tap or 'bore 36 which communicates with a lateral tap 37 which receives the upper end of the tube 32, and with which the tube is connected in any suitable manner. The outer end of the bore 36 terminates in an enlarged threaded portion 38 into which is threaded the end 39 of the ejector member 40, having a relatively small axial bore 41 through which the liquid in a fine stream is discharged into the small variable space between the ejector member and an adjustable nozzle tip 42, having a threaded connection with the casting 21. As shown, the ejector member 40 is formed with spaced circumferential flanges 4.3, which are provided with a series of spaced grooves 44 angularly disposed with relation to the nozzle chamber, whereby the air stream will be given a more or less whirling action depending upon the adjustment of the space between the ejector member 40 and the nozzle tip 42, and thereby regulating the degree of diffusion of the liquid into spray. The nozzle tip 42 is formed with a tapering bore 45, the taper of which coincides with the peripheral taper of the flanges 43 of the ejector member 40, so that, by adjusting the nozzle tip 42 inwardly, the volume of air passing between said parts will be correspondingly reduced and the whirling action thereof increased, and by adjusting the nozzle tip 42 inwardly to its full limit the end of the ejector member 40 is brought into contact with the bore of the nozzle tip, so that only very little air can mix with the fluid issuing from the ejector member 40, and a fine stream of fluid will be ejected, which feature is of particular advantage in permittin distinctive outline color tracings to be rapi 1y made on an object, and with the development of skill in handling the sprayer, the application of distinguishing color striping, as distinguished from the present practice of applying such striping with a brush, may be rapidly accomplished. V

In order to permit the flow of the liquid to be substantially instantly shut off without liquid stopping the motor and pumping of air to the container, means is provided for rapidly exhausting the air from the container and preventing the building up of air under pressure by the continued operation of'the air pump, so that no liquid will be forced from the container. Said means consists of a cap 22 of the container 23 with a relatively large exhaust opening 46 to the atmosphere, and a closure or valve member 47 therefor, preferably of resilient rubber, which is carried on the upper end of an angle lever 48, suitably pivoted at 49 to the nozzle casing, and the vertical arm 50 of which lever is disposed so as to be in convenient reach of the forefinger of the hand holding the device. In practice, and with the air pump in operation, the valve member 47 is held seated by the finger of the operator, thus rapidly building up air pressure in the container and ejecting the liquid. By releasing the valve lever 48 the pressure within the container instantly unseats the valve, thereby instantly reducing the pressure and bringing the feed of the liquid to the nozzle to a stop. As the air pump rapidly builds up pressure in the container, it will be seen that by the simple manipulation of the lever 47 a control is provided whereby the spraying action may be substantially instantly started and stopped, thereby preventing the waste of liquid in the movement of the device other, which waste prevails in devices of this character relying on the starting and stopping of the motor as a control, because of the air pressure remaining in the container for a period following the stopping of the motor and the spinning of the motor armature for a period due to the momentum thereof following a switching off of the motor.

It will be seen from the foregoing that the improvement provides a highly efficient device for spraying substantially any liquid including viscous liquids for decorating and finishing purposes, and for various other uses and materials applied by spraying; that the density of the material sprayed with relation to the volume of air used for dispersion purposes may be easily and readily varied, and that the controlling means for starting and stopping the spraying action serves to practically start and stop such action instantly, so that the device may be aimed from one point to another Without Waste of material in making the change of position and without stopping the motor driven air compressor. Furthermore, adjustable means permit the ejection of a fine, solid stream of liquid by cutting down the air stream to the dispersion area of the nozzle, the advantage of which will be obvious for many purposes, e. g. for outlining and filling in lettering for large signs on billboards and building Walls, and for striping various objects in colors.

the under side of from one position to an-,

The invention having been set forth, what is claimed as new and useful is 1. In a hand-portable spraying machine, a

nozzle unit having a tubular duct, a nozzle at one end of said duct, a liquid container joined to the under side of said duct and so arranged that compressed fluid supplied to said duct causes liquid from said container to be sprayed through said nozzle, a compressor unit including an electric motor and an air compressor carried on and driven by said motor, a bolt extending between the rear portion of said nozzle unit and to said compressor unit clan'lping the same to each other, said bolt forming a hollow conduit for supplying compressed air from said compressor to the hollow space in said tubular member.

2. In a single-unit hand-portable spraying device, a rigid air discharge duct, a nozzle at the front end'of said duct, a liquid container detachably held in closed condition on said duct, a liquid discharge duct extending from near the bottom of the container into said air discharge duct and having a discharge tip opening back of said nozzle, a compressor and an electric driving motor therefor connected to said discharge duct and carrying the same, the

discharge opening of said compressor being connected to said discharge duct and to the interior of said container, a handle on said device for carrying and guiding the same, an electric switch for said motor arranged within reach of the hand gripping the handle to start and stop the operation of said compressor, a valve for controlling the compression of the air in said container to start and stop the spraying action, and means Within reach of the hand dle for operating said valve independently of the operation of said switch whereby the spraying action may be started and stopped while compressed air from said compressor continues to flow through said nozzle.

3. In a single-unit hand-portable spraying device, a rigid air discharge duct, a nozzle at the front end of said duct, a liquid container detachably held in closed condition on the gripping the hannozzle, a compressor and an'electric driving motor therefor connected to said discharge duct and carrying the same, the discharge opening of said compressor being connected to said discharge duct and to the interior of said container, a handle on said device for carrying and guiding the same, an electric switch for said motor arranged within reach of the hand gripping the handle to start and stop the operation of said compressor, a valve for closing and opening to the atmosphere the space Within said container for releasing the compression therefrom to start and stop pressed air from said compressor continues to flow through said nozzle.

4. In a. spraying device, a container for liquid to be sprayed, a rigid compressed fluid discharge duct above said container, a discharge nozzle at the end of said duct, a liquid discharge duct extending from near the bottom of said container into said fluid discharge duct and having a discharge tip back of the opening of said nozzle, a source of compressed air, means for producing a continuous flow of said air into said fluid discharge duct and said container, and valve means for controlling the pressure conditions in said container to start and stop the spraying action while said air flows continuously through said nozzle.

The method of controlling the operation of a spraying device of the type including a container for liquid to be sprayed, a compressed fluid discharge duct, a discharge nozzle at the end of said duct, a liquid discharge duct extending from near the bottom of said container into said fluid discharge duct and having a discharge tip back of the opening of said nozzle, and a source of compressed air to supply said compressed fluid discharge duct and the space within said container, which comprises maintaining continu ously a flow of compressed air into said liquid discharge duct and through the nozzle, and starting and stopping the spraying action by maintaining the compressed air under compression within said container or releasing the compression therefrom.

(i. In a hand portable spraying machine, an electric motor, a rotary compressor at one end of said motor, said compressor having cooling ribs extending outwardly from its periphery, said motor having means for producing a stream of air passing along said cooling ribs to cool said compressor, a rigid nozzle unit having a hollow duct, a spray nozzle at the front end of said duct, a liquid container detachably secured to the underside of said duct to supply spraying liquid to said nozzle, means for detachably supporting the rear end of said nozzle unit on the periphery of said compressor outside the peripheral region occupied by said ribs, the said duct extending in a direction transverse to the motor axis, a duct connection between the discharge opening of said compressor and the rear end of said duct extending through the junction between said nozzle unit and compressor for supplying compressed air to said duct, and means utilizing the compressed air from the duct for delivering liquid from said container to said spray nozzle and discharge it therefrom in atomized form, the discharge opening of said nozzle being so arranged that the direction of the spray issuing from the nozzle is different from the direction of flow of th cooling air passing over said compressor.

7. In a hand portable spraying machine, an electric motor, a rotary compressor axially mounted at one end of said motor and having a. diameter smaller than said motor, cooling ribs extending outwardly from the periphery of said compressor within the space bounded by the periphery of said motor, air impelling means .driven by said motor for passing a stream of air along said cooling ribs to cool said compressor, a rigid nozzle unit having a hollow duct, a spray nozzle at the front end of said duct, a liquid container detachably secured to the underside of said duct to supply spraying liquid to said nozzle, supporting ribs extending outwardly from the periphery of said compressor, means for detachably clamping the rear end of said nozzle unit of said supporting ribs to hold said nozzle unit outside the peripheral region oc cupied by said cooling ribs with the duct extending in a direction transverse to the motor axis, one of said supporting ribs having a perforation providing an air supply connection between the discharge opening of said compressor and the rear end of said nozzle duct, and means for utilizing the compressed air from said nozzle duct for delivering liquid from said container to said spray nozzle and discharge it therefrom in atomized form, the discharge opening of said nozzle being so arranged that the direction of the spray issuing from the nozzle is different from the direction of flow of the cooling air passing over said compressor.

In testimony whereof I aflix my signature.

SIMON DEUTSCH.

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