US2243435A - Sprayer - Google Patents

Description

y G. MOTT, JR., Er 2,243,435

SPRAYER Filed Aug. 31, 1938 21 'Zib w 20 55 14 23 ar g u ,4 26 29 I INVENTORS. d M De. y.

Patented May 27, 1941 2,243,435 SPRAYER Garret Mott, Jr., Scarsdale, N. Y., and Charles L.

Brown, Jr., Stamford, Conn., assignors toElectrolux Corporation, New York, N. Y., a corporation of Delaware Application August 31, 1938, Serial No. 227,612

3 Claims.

This invention relates to sprayers and more particularly to sprayers designed for operation by air fiow at a relatively low pressure.

An object of the invention is to provide an improved sprayer of the type operated by'low air pressure with means for regulating the liquid spray.

What we consider to be novel and our invention may be better understood by reference to the following specification and appended claims when considered in connection with the accompanying drawing, in :which Fig. 1 is a cross-sectional view of the improved sprayer;

Fig. 2 is a top view;

Fig. 3 is a detailed sectional view taken along the line 3 3 of Fig. 1 of a portion of the sprayer with the regulating valve in a fully opened position;

Fig. 4 is a view similar to Fig. 3 with the regulating valve in an intermediate position; and

Fig. 5 is an exploded view of the regulating valve.

Referring to the drawing, I indicates a container in the form of a .glass jar for a liquid N tobe sprayed. In threaded engagement with the container I0 is a cover l2 with an interposed gasket |3 for eflecting an air tight seal between the container l0 and cover l2. Secured to the top of cover |2 is an air tube M with an air inlet l and air outlet I6. Air tube I4 is tapered toward the outlet to produce a high velocity of air in the outlet opening l6 and to produce a pressure in the container I0 as will be explained below. Liquid riser I1 is secured to the cover I2 and extends from substantially the bottom of container H) to the outlet opening l6 of air tube I 4. Sprayer nozzle I8 is in threaded engagement with the end of liquid riser I! with its opening l9 positioned beyond the end of air tube M. The opening IQ of nozzle I8 is smaller than the inner bore of the liquid riser l'l to produce a concentrated spray of liquid.

An air admission tube 20 for the container I0 is secured to the cover l2 and extends traversely through the air .tube M. Tube 20 has a relatively small opening 2| communicating with theinterior of the tube serving to admit'air to the container In for the purpose of producing an air pressure above the liquid II. Upon the passage of air through the air tube M from the large inlet opening l5 to the smaller outlet opening IS a pressure head is produced within the air tube M. This pressure is communicated through the admission tube 20 to the container Ill above liquid N and causes the liquid to flow up through the liquid riser I1 and out through the opening IS. The air flowing through the out-let opening l6 supplements the air pressure above the liquid N in-producing a flow of liquid from the opening IS. The high-velocity air leaving the exit opening l6 also serves to direct and disperse the liquid spray.

. The air pressure in the container I0 above liquid N is varied and the quantity of flow of liquid controlled by'a regulating valve 22. Regulating valve 22 includes a tube 23 having a knurled cap 24 and an angular slot 25. Tube 23 extends through the admission tube 20. Tube 23 is secured in the admission tube 2|) by means of a pin 26 extending traversely through apertures 21 in the bottom of tube 23. A spring 28 and washer 29 are located between the pin 26 and cover l2. A bleeder opening 30 is provided in cap 24 for a purpose which will be explained below. When the regulating valve 22 is in the fully opened position as shown in Fig. 2, the angular slot 25 completelysuncovers the opening 2| as best indicated in Fig. 3. The pressure head produced by'the flow of air through the air tube I4 is communicated to the container II]. This pressure drives the liquid N up the riser I1 and out the nozzle opening l9; Air flows into the container l0 through the opening 2| of admission tube to replace the liquid leaving the container. Some air flows out through the bleeder opening 30, but due to its relatively small size as compared with opening 2|, this does not appreciably reduce the pressure within the container I0. With the regulating valve 22 in this position a maximum flow of liquid through the liquid riser l1 and nozzle I8 is produced. If it is desired to reduce the. flow of liquid, the tube 23 is rotated by means of a knurled cap 24 from the position indicated in Fig. 3 to an intermediate position as shown in Fig. 4. In the intermediate position of Fig. 4, the angular slot only partially uncovers the opening 2|. This reduces the effective size of opening 2|, as compared with bleeder opening and so reduces the air pressure above the liquid N of container H).

In the fully-opened position, the pin 26 engages the riser I! as a stop for the regulating valve 22. In the fully-closed position the open--,

ing 2| is completely covered and so no air is admitted to the container III. This stops the flow of liquid through the riser l1 and nozzle I8. When the regulating valve is in the closed position the opposite end of pin 26 engages riser H to position and stop the regulating valve.

There is of necessity a clearance between the air admission tube 20 and tube 23 when the regulating valve 22 is in the fully closed position. This may produce a slight flow of liquid through the riser H with the valve in the closed position. A flow of liquid when the regulating valve 22 is closed is prevented by bleeder opening 30 which discharges the air flowing in this clearancespace to atmosphere. The opening 30 is sufliciently large to relieve any pressure in the container l sition.

The regulating valve 22 is assembled to the cover l2 simply by inserting it through the admission tube 20, placing over its end the spring 28 and washer 29, after which pin 26 is inserted through openings2l. Subsequent accidental removal of the pin 26 is prevented by grooves 3| in pin 26 which receive washer 29. Spring 28 holds the washer 29 seated in the grooves 3|. Spring 26 also produces suflicient friction to hold valve 22 in any selected position.

.In the normal operation of the sprayer, it is contemplated that a source of air pressure will be connected to the air tube H as by inserting .the end of a vacuum cleaner hose orother air conduit which may be connected to the blower side of a vacuum cleaner or other source of air pressure in opening IS. The sprayer will be grasped by the conduit connected to the air tube M. The hand gripping the conduit will be in a position to control the regulating valve 22 by a forefinger or thumb simply rotating the valve tube 23 to a position to obtain the desired flow of liquidi'rom the nozzle l8. To replenish the supply of liquid H in container to, the cover 12 is removed from the container H). The air tube 14, liquid riser I1, and regulating valve 22 are all ounted on the cover I2 which facilitates the man facture and assembly of the sprayer.

What we claim is: I

1. A sprayer including a liquid container; a cover for said container; an air tube secured to said cover having an inl t opening and an outlet opening; an open ended admission tube extending across said air tube, through said cover, and having an opening intermediate its ends communicating with the interior of saidair tube; a liquid riser extending from adjacent the bottom of said container to the outlet opening of said air tube; a tubeextending through said admission tube 'when the regulating valve 22 is in a closed pohaving a knurled cap with a bleeder opening; an angular slot adapted to partly or wholly uncover the opening in said admission tube; a pin passing through apertures in said last-named tube adapted to engage said riser to, stop the r0- tation of said tube in an open or closed position; a washer seated in grooves in said pin; and a spring located between said washer and said cover; whereby the flow of liquid is controlled by rotating said last-named tube to vary the efiective size of the admission tube opening, communicating with the interior of the air tube relative to the size of the bleeder opening and regulate the pressure in said container.

2. A sprayer including a liquid container; a cover for said container; an air tube having an inlet opening-and a smaller outlet opening; an admission tube extending across said air tube having a first opening communicating with the interior of the air tube and a second opening communicating with the interior of the container; a liquid riser extending from the bottom of the container to the outlet opening of the air tube; and a valve adapted to partly or wholly uncover the opening in the admission tube communicating with the interior of the air tube and having an opening communicating with the atmosphere, whereby the flow of liquid is controlled by the relative size of the opening in the admission tube communicating with the interior of the air tube and the opening in the valve communicating with the atmosphere.

3. A sprayer including a liquid container; a cover for said container; an air tube secured to said cover having an inlet opening and a smaller outlet opening; an admission tube extending across said air tube having a first opening communicating with the interior of the air tube and a second opening communicating with the interiorofthe container; a liquid riser extending from the bottom of the container to the outlet opening of the air tube; and a valve adapted to cover or uncover the opening in the admission tube communicating with the interior of the air tube; said valve having an opening communicating with the atmosphere to relieve any pressure in the container due to leakage past the valve when the valve covers the opening in the admission tube communicating with the interior of the air tube.

v GARRET MO'I'I, JR.

CHARLES L. BROWN, J a.

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