US 1738863 A
Description (OCR text may contain errors)
Dec. 10, 1929. H. J. BRAGDON sPRnER AND THE LIKE Filed April 21, 1928 Pateflted Dec. 10, 1929 UNITED sures PATENT OFFICE HERBERT a. BRAGDON, or CHICAGO, ILLINOIS, ASBIGNOB ago wxsco mun-Assume 00., or mamson, WISCONSIN, A conroaarrxon or wisconsnr SPRAYER AND 'rnn LIKE "Application filed April 21, 1928. Serial 3052713441 This invention has to do with improvements in sprayers for spraying materials such as paints, germicides and similar materlals. The construction of the sprayer herein disclosed may also be used for spraying such materials as powders and the like.
The construction of sprayer herein disclosed has been devised with particular reference to use with the air delivered under relatively low pressure by vacuum cleaners and the like. This air is usually delivered underpressure of not to exceed 5 lbs. per square inch, and generally less. There is available, however, a sufficiently large volume of such low pressure air to successfully perform the spraying operation.
The sprayer herein disclosed is of the general type known as a cup gun sprayer, that is one in which the liquid is carried in a relao tively small cup or container which is definitely connected to the spray gun itself.
Furthermore, the sprayer herein disclosed is one in which said cup is closed so that it may be supplied with air under ressure to thereby assist the movement or ow of the liquid to the discharge orifice.
Furthermore, the sprayer herein disclosed is of the general type in which the liquid tube from the cup extends up to a position in ad- Vance of the air discharge orifice, said liquid pipe being entirely outside of and independent of the air pipe itself.
This application also relates to cup gun sprayers of the general type disclosed in my co-pending application for Letters Patent of the United States on sprayers and the like, Serial No. 223,113 which was filed September 30, 1927.
One of the features of the present invention relates to the provision of an improved construction of spring valve for controlling the discharge of air from the supply pipe to and past the liquid discharge orifice. This feature relates to the provision of an improved form of a spring valve shut off whlch may be very conveniently manipulated by the same hand with which the operator grasps the cup gun itself.
Another feature of the invention relates to the provision of an improyed arrangement after described and claimed.
of air supply tube for delivering the air presto discharge directly into the atmosphere so that no pressure is built up in the liquid container.
A further feature in connection with the foregoing is to provide an arrangement such that when the spring valve is depressed into the initial working osition the air discharge orifice will deliver 1ts full supply and blast of air to, the liquid tube so that the same will be fully efiectlve for operation as a siphon and without building up air pressure within the container. Upon further depression of the aforesaid spring valve the air wastage port will be sealed so that the air pressure will be built up inside of the liquid cup, thus causing the liquid to be delivered to the liquid orifice under pressure as well as by a siphoning action.
More specifically it is an object to directly combine the aforesaid spring valve with the air wastage opening so that the control of said wastage opening is affected directly by the spring valve and without the necessity of providing other and special parts for, this purpose.
Other objects are to provide a very simple form of construction, one which can be very cheaply manufactured from few parts and at low costs, and one which will be durable and very satisfactory in operation.
Other objects and uses of the invention will appear from a detailed description of the same which consists in the features of construction and combinations of parts herein- In the drawings: Figure 1 shows a side elevation of a sprayer embodying the features of the present inven-' I Fig ond working position is shown by another set of dotted hnes; I
Fig. 2 shows a plan view corresponding to 1 and ig. 3 shows a view at ri ht angles to Fig. 1, a portion of the jar an cap and related parts being broken away to better illustrate the details of attachment of the liquid tube to the cap.
The liquid container may be of any suitable form, but it conveniently, takes the formof a small glass jar 5, preferably having a relatively wide mouth, such as a pint or half pint Mason jar. The cover 6 for said 'ar screws on in the usual manner. Prefera 1y a rubber gasket 7 is placed around the shoulder at the lower end of the threads onv forcing plate 11 is set against the bottom surfaceof the cover so as to reinforce the same at aiid adjacent to the point of attachment, of the air pipe.
The front end of said air pipe is partially closed by a partition or late 12 having a relatively large central ori ce 13. Said plate 12 may be formed integrally with the air pipe f as illustrated in Fig. 1. or may constitute a separate piece soldered, welded or otherwise secured in place.
The air pipe 9 reaches out in aradial direction as shown .in Fig. 2. Its outer end 13 .is intended to receive an air hose for supply of low pressure air such as that delivered by a vacuum cleaner.
Opposite to the position of the orifice 13 is an upstanding liquid tube 14 the upper end 15 of which stands substantially in line with the center of the orifice 13. Said tube 14 reaches down through the cover and to a position close to the bottom of the jar 5.
. A shouldered nipple 16 is set onto the tube 14 at the place where said tube passes through the cover. .A'washer or flange 17 is placed against the top surface of the cover so as to receive thejthrust from the shoulder of the nipple 16. The reinforcing plate 11, or a separate washer, may be placed" against the bottom surface of the cover at the point where the nipple passes through so as to receive the upthrust ofla nut 18 threadedpnto th as shown in Fig 3. The nipple'16 itself may be soldered or otherwise permanently attiched to the tube-14 or may be simply placed thereon with a driving fit.
The spring valve 19 comprises a section of spring strap having its rear end 20 riveted or e nipple portioned that when the spring valve 19 is deflected down into the dotted line position of Fig. 1 said toe 22 will ride in adjacent to or behind the collar 17 so as to establish a sort of step bearing at this point. This action will also limit the downward movement of the front portion 21 of the spring valve and definitely position the same. Said front portion 21 is provided with a relatively large opening23 in such position that when the downward movement is arrested in the manner already explained said opening 23 will stand in line with the opening 13 at the front end of the air pipe and the upper discharge end 15 of the liquid pipe 14. Under these conditions a full blast of air will be allowed to flow directly from the air pipe across the top end of the liquid pipe so as to produce a -very strong siphoning action.
There is an air pipe 24 extending vertically through the air pipe 9 at the position where said air pipe overlies the cap 6. The lower end of the pipe 24 is flared or riveted out against the bottom surface of the cap 6' as clearly shown in Fig. 1. The upper end of the pipe 24 extends slightly above the pipe 9 and terminates ina substantially flat end 25. The pipe 24 is provided with an orifice 26 acing against the flow of air through the pipe 9 so that said orifice will receive air and deliver the same both up and down through the pipe 24. Air delivered down will tend to create a pressure in the liquid receptacle, but as long as the top end of the pipe 24 is opened such pressure cannot build up.
The spring valve 9 is so constructed and formedthat when the toe 22 comes to bearing as shown in Fig. 1 the body portion of the spring valve stands some distance above the upper end 25 of the pipe 24 as is shown by the dotted line 27 in Fig. 1. This will leave said upper end open and allow air to continuously escape therefrom, thus'preventin any building up of pressure within the liquid receptacle. A further slight movement of the of the spring valve will force it down to the position shown by the dotted lines 28 in Fig. 1 so as to close the upper end 25 of the pipe 24 and cause pressure to build up in the liquid receptacle. This action will take place without any movementoi. the opening 23 away from its position of alignment If desired the upper portion of the tube 14 may be formed as a section of the nipple 16,
or said nipple may be formed integrally with the tube itself. In any case thetube or its upper end may be readily removed and another one substituted having a different size of orifice so as to provide for a greater or smaller amount of liquid discharge with a given amount of siphoning action. I I
. Ordinarily two of the tubes 14 will be provided, having different sizes of orifice. Under the circumstances it is possible to securefour limits of rate of discharge, two by the use of tubes of different sizes, and'two for each of said tubes, one being with the spring valve 19 depressed to theposition 27 and the other being with said valve depressed to the position 28,
If desired the spring valve 19 may be reinforced at the point where its front portion 21 is bent down, such reinforcing being established by the V-shaped ribs 29.
While I have herein shown and described only a certainembodiment of the features of my present invention still I do not intend to limit myself thereto except as I may do so in the claims,
I claim: i
1. A sprayer for the purpose specified comprising in combination a receptacle having a cover, an air supply pipe having its end portion secured to the top of said cover and projecting outward therefrom, a closure for the end of said air supply pipe, an air opening in said closure for the discharge of an air blast, a liquid tube extending through and sealed to the cover and having its lower end reaching into the receptacle, theupper end of said liquid tube terminating substantially in line with the axis of the air opening aforesaid and subject to atomizing action of the air blast therefrom, an air pressure pipe extending vertically across the air supply pipe and having its lower end extending through the cover into communication with the interior of the receptacle, and its upper end extending through the top of the air supply pipe and terminating above the same, there being an orifice in said air pressure pipe facing against the current of air flowing through said pipe. and a spring valve for said parts comprising a length of spring strap overlying the front end portion of the air pipe and the upper end of the air pressure pipe and having its front portion turned downwardly on a sharp angle and terminating in a toe, the rear end of said spring strap be ng rigidly connected to the air supply pipe behind the position of the air} pressure pipe. and there being an air opening in the downwardly turned front portion of said spring strap, the front end portion of said spring strap being normally sustained by spring action in raised position to maintain an imperforate portion of the down turned front in the path of air blast to thereby interfere with such blast the closes said upper end of the air pressure pipe without displacement of the air opening from the path of blast to thereby cause accumulation of pressure within the receptacle, substantially as described.
2. A sprayer for the purpose specified comprising in combination a receptacle having a a cover, an air supply pipe having its delivery end located above the top of said cover, a liquid tube extending through and sealed to the cover and having its lower end reaching into the receptacle, the upper end of said liquid tube terminating substantially in line with the'axis of the air pipe aforesaid and subject to atomizing action of the air blast therefrom, an air pressure pipe extending across the air supply pipe and having its lower end extending in communication with the interior of the receptacle, and its upper end extending through the top of the air supply pipe, there being an orifice in said air pressure pipe, and a spring valve for said partscomprising a length of spring strap overlying the front end portion of the air pipe and the upper end of the air pressure pipe and having its front portion turned downwardly on a sharp angle, and there being an air opening in the downwardly turned front portion of said spring strap, the front end portion of said spring strap being normally sustained in raised position to maintain an imperforate portion of the down turned front in the path of air blast to thereby interfere with such blast the arrangement being such that when the spring valve is depressed the air opening through the front portion of said spring aligns with the path of air blast to thereby cause atomizing action,
the upper portion of the spring strap being then d sengaged from the upper end of the air pressure pipe to allow free exit of air from said upper end and without accumula-' tion of pressure in the liquid receptacle, and beingsuch that further movement of the spring strap downwardly closes said upper end of the air pressure pipe without displacement of the air opening from the path of blast and at the same time closes the upper end of the air pressure pipe to cause accumulation of pressure within the receptacle, substantially as described. F
HERBERT J. BRAGDON'.