US2315581A - Powder sprayer - Google Patents

Description

April 6, 1943. H. J. BERENSON POWDER SPRAYER Filed Sept. 18, 1940 2 Sheets-SheerI 1 3 Herve d. Berens on April 6, 1943. H. .1, BERENSON POWDER S PRAYER Filed Sept.. 18, 1940 2 Sheets-Sheet 2 7,5 71 zz 77% 52 y; 1,7

Patented Apr. 6, 1943 POWDER SPRAYER Henry J. Berenson,

St. Paul, Minn., assigner to Mueller Can & Tube Co.,

St. Paul, Minn., a

corporation of Minnesota Applicatin september 14s, 1940, serial No. 357,193

3 Claims.

My invention relates to powder sprayers and has for an object to provide an extremely practical construction for the purpose.

Another object of the invention resides in providing a powder sprayer which can be constructed at an economical cost.

A still further object of the invention resides in providing a powder sprayer which may be used to spray powder regardless of the position in which the sprayer is held.

An object of the invention resides in providing a powder sprayer having an air ductfand so constructed that the'powder is caused to enter the air duct by means of gravity, suction, and air pressure.

An object of the invention resides in constructing the sprayer with a tubular receptacle having a circumferential wall and end` walls connected therewith and provided with an air duct disposed eccentrically relative to the circumferential wall.

Another object of the invention resides in forming said duct by means of a partition having flanges thereon secured to the circumferential wall of the receptacle.

,A still further object of the invention resides in providing the duct with openings at both ends thereof communicating with the receptacle at the two ends thereof and in proximity to the end Walls of the receptacle.

A feature of the invention resides in providing in one end wall a discharge outlet communicating with the air duct and in providing at the other end an air inlet communicating with the air duct. I

An object of the invention resides in arranging the opening in the air duct adjacent the air inlet laterally of the air inlet to cause a suction to be induced in said opening whereby the powder in the receptacle is drawn into said duct through sai-d opening by means of suction.

Another object of the invention resides in constructing said discharge outlet of a cross section considerably less than the cross section of the opening in the duct adjacent thereto to cause a pressure to build up in the discharge end of the duct, forcing air into the compartment containing the powder and causing the powder to enter the duct through the other opening.

Another object of the invention resides in prof viding a tubular member having a head at one end and in which the receptacle is received, said receptacle forming in conjunction with said tubular member a piston for forcing the air through the air inlet and into' the air duct.

A feature of the invention resides in providing a valve in said head and also in the specific construction of said valve.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

In the drawings:

Fig. l is a plan view of a powder sprayer i1- lustrating an embodiment of my invention.

Fig. 2 is a longitudinal elevational sectional View taken on line 2 2 of Fm. 1.

Fig. 3 is a view similar to Fig. 2 showing the parts in altered position.

Fig. 4 is a view similar to Fig. 3 showing the sprayer in action when arranged at an upwardly inclining angle. Y

Fig. 5 is a view similar to Fig. 4 showing the sprayer in action when arranged at a downwardly inclining angle.

Fig. 6 is a cross sectional view taken on line 6 6 of Fig. 2.

Fig. 7 is a cross sectional view taken on line I 'I of Fig. 2.

Fig. 8 is a fragmentary elevational sectional view taken on line 8 8. of Fig. 6.

My invention comprises a receptacle IIJ which includes a body portion II and a removable cap I2. The receptacle I0 has associated with it a tubular member I3 which operates in conjunction with the said receptacle to form an air pump. These parts will now be described in detail.

The body portion Il of the receptacle I0 includes a cylindrical or circumferential wall I4 which may be constructed from a tube of paper or some other similar material. This circumferential wall has attached to one end thereof an end wall I5, preferably formed of sheet metal, which is provided with a flange I6 crimped about the lower end of the wall I4 whereby the same is attached thereto. The other end of the circumferential wall I4 is open and is adapted to be closed by the cap I2.

The cap I2 is constructed with a tubular portion I1, also constructed from a tube of paper or some similar material which is provided with an end Wall I8 formed of sheet metal having a flange I9 crimped about the end of said tubular portion and thus securing said end wall thereto. The circumferential Wall I4 of the body portion I I is adapted to telescope within the tubularportion I'l and fits closely within the same, so that, when the cap I2 is applied to the body portion Il, the receptacle I becomes closed at its ends through the end walls I5 and I8.

The cap I2 is employed for the purpose of giving access to the interior of the receptacle for filling the same with said cap may be dispensed with and the end wall I8 secured to the end of the circumferential wall III and other means formed in the end wall |18 for lling the receptacle.

The tubular member I3 is constructed from a tube 2I of paper or some other similar material which is provided at its end with a head 212. This head is constructed from sheet metal and is formed with a flange 23, similar to the flange I8, which is crimped about the lower end of the tube 2I. The head 22 is similar in construction to the end wall I5 of the receptacle Iii. The circumferential wall Il of the container I I is adapted to lit snugly within the interior of the tube 2l. To cause a tight t between the wall Iii and tube 2l, the ilange I6 is caused to lie ush with, or inwardly of the outer surface of the wall i6. By means of this construction an air pump is formed, the receptacle IIJ serving as a piston and the tubular member i3 serving as a cylinder. lit will thus become evident that upon relative movement between the receptacle I0 and tubular member I3, the air between the head 22 and the end wall I5 will be compressed.

Within the interior of the receptacle i0 is provided a partition 2B constructed of paper or some other similar material which is formed with two @anges 25. The width of the partition 2B is less than the internal diameter of the circumferential wall id. The two flanges 25 are glued or otherwise attached to the circumferential wall I4, as shown in Fig. 6. By means of this construction a compartment 26 is formed on one side of the said partition, and a duct 21 is formed on the other side of said partition. In Fig. 6 it will be noted that the cross sectional area of the duct 21 is considerably less than the cross sectional area of the compartment 26. The partition 2d falls short of the end walls I5 and I8 of the receptacle Ill to form two openings 28 and 29., in the portion, which bring the compartment 2B at its ends into communication with the duct 21 at its ends. The powder to be dispensed is kept in the compartment 26 and may pass through the openings 28 and 23 into the duct 21.

in the head 22 of the tubular member le is formed two holes 3| and 32 which are spaced from one another. Extending across these holes is a dapper valve 33 constructed of paper, which valve is held in position intermediate the ends thereof by means of two tongues 34 struck up from the metal of the head 22 and overlying the said valve, intermediate the ends thereof. By means of this construction the outermost portions 35 of the valve may swing `upwardly from the head 22, as shown in Fig. 3; to allow air to pass through the holes 3i and 32 and into the chamber 36 formed within the tube I3 and between the head 22 and the end wall I5. When the tubular member I3 is moved toward the head i5 the air within the chamber 36 is compressed and the valve member 33 closed.

In the end wall I5 is provided a hole 31 which forms an air inlet communicating with the duct 21. This air inlet is covered with a screen 38 formed of fabric or any other suitable material, which screen overlies the entir'e surface of the end wall I5 and is held in place under the flange I6. In the end wall I8 is formed a cup-shaped powder. If desired, the

depression 4I which is constructed at the center 75 of the same with a small hole I2 which serves as a discharge outlet. This hole is situated op posite the duct 21. It will readily be comprehended that, when air is compressed in the chamber38 the same travels along the duct 21 and picks up whatever powder is in the duct and discharges the same through the discharge outlet 42.

The operation of the invention is as follows: When the sprayer is positioned, as shown in Fig. e, the powder extends down toward the end wall I5 and overlies the opening 29. A certain amount of the powder passes through said opening and into the duct 21 by the action of gravity. When the tubular member I3 is drawn outwardly the valve 33 opens as shown in Fig. 3 permitting air to enter the chamber 36. As the said tubular member is moved tow-ard the receptacle IIB the air chamber 3B becomes compressed, the valve 83 closes and the air is forced through the screen 38 along. the duct 21 and out through the discharge outlet d2. This action creates a current of air in duct 21 which picks up the powder entering the said duct and due to the size of the discharge opening Q2 and the depression 4I formed in end wall I8 the powder is sprayed in the form of a cloud of dust upon leaving rthe sprayer. Due to the use of the screen 38 the powder does not drop into the chamber 36 but is confined to the duct 21. The valve 33 being constructed of paper the resistance to the opening of the same is so slight that practically no suction is produced in the duct 21 when the tubular member i3 is withdrawn. For this reason the powder remains in the compartment 26 and in the ductI 21. While the air is traveling along the duct 21, the velocity of the current of air iiowing through the air inlet 3i and past the opening 29 induces a suction at said opening which draws the powder from the compartment 26 and into the duct 21. At the same time, due to the indentation il and due to the relatively small area of the discharge outlet 2 compared to the area of the opening 28 a pressure is created in the upper portion of the passageway 21 which creates a pressure in the upper part of the compartment 26. This pressure assists in forcing the powder in the compartment 23 toward the opening 23 from which it may enter into the duct 21. When the device is held in the position shown in Fig. 5 the powder moves toward the discharge end of the receptacle. The powder may then ow out through the opening 28 and into the duct 21. The air flowing through the duct produces the same effect and causes a cloud of dust to leave the sprayer from the nozzle 42. While the pressure created in the duct 21 tends to force the powder back through the opening 28, yet'it is to be remembered that this pressure is relieved during the return stroke of the tubular member i3 allowing another charge of powder to enter the duct 21 by gravity. It will thus become apparent that the device will operate whether inclined downwardly or inclined up wardly. When the device is positioned vertically the results are the same as produced when inclined in the manner shown in Fig. 4. If the device is turned so that the duct 21 is uppermost, the device still functions. When so arranged and inclined as shown in Fig. 4, the lowermost opening still remains closed and powder may enter into the duct 21 by gravity. In addition, the pressure and suction previouly referred to augment this action. The same is true when the sprayer is arranged with the duct 21 uppermost and disposed in the position shown in Fig. 5. Should the sprayer be held horizontally with the duct 21 uppermost, both openings 28 and 29 would be uncovered. This would permit the air to circulate freely through the part of the compartment 26 adjacent the partition 24, which would be occasioned by the pressure of the air at the opening 28 and the suction at the opening 29. The air, in passing over the powder in the compartment 26, would in such case pick up some of it and a certain amount of powder would be discharged through the orifice 22. The amount of the powder so discharged would, of course, be increased in accordance with the violence with which the tubular member I3 It will thus be readily comprehended that the device will operate to spray powder in any position in which the same may be ordinarily held for the purpose.

The advantages of my invention are manifest. The sprayer is extremely simple and has no complicated parts to get out of order. may be easily constructed any particular manner. made to discharge the entire contents thereof so that waste does not occur. My improved sprayer may be made extremely attractive in appearance and resembles an ordinary container.

Changes in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit o! my invention. i

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A powder sprayer comprising aA receptacle having end walls and a lateral wall structure, a partition within said receptacle extending between the end walls thereof and dividing the receptacle into an air duct and a compartment for the reception of powder, anges formed on said partition and secured to the lateral wall structure of the receptacle for holding the partition in place, said partition being spaced from the end walls of the receptacle to form openings therebetween extending throughout the width of said partition for bringing said compartment into communication with said duct, a discharge outlet in one of said end walls communicating with said duct and an air inlet in the other of said end walls communicating with said duct and opposite the end thereof.

2. A powder sprayer comprising a receptacle having end walls, a member within said receptacle providing an air duct extending from one end wall thereof to the other, said member having a laterally extending opening therein at one end, wall of said receptacle adjacent said opening having a discharge outlet therein, said member having another opening therein at its opposite end through which the powder may enter the duct, the other end wall of the receptacle having an inlet communicating with said duct through which air may be forced into the duct,.

said discharge outlet being sufciently small to create a pressure in the duct at the discharge end of the duct forcing air into the receptacle at the upper end and through the opening in the member adjacent the discharge end of the duct, the opening in the end wall of the receptacle through which air enters the duct being sumciently small to produce an air current past said inlet opening in the member and create a suction at said opening, the action of the air passing through the duct causing the entry of powder into the duct through the opening in the member adjacent the inlet opening and resulting in the spraying of the powder and air on leaving the discharge outlet.

3. A powder sprayer comprising a receptacle having end walls, a member within said receptacle providing an air duct extending from one end wall thereof to the other, said member having a laterally extending opening therein at one end, the end wall of said receptacle adjacent said opening having an inlet causing the air entering said duct to travel at right angles to said openingand inducing a suction through said opening tending to draw the powder into the duct. through said opening, the other end of said receptacle having a discharge outlet therein communicating with said duct, said member having another opening at its other end in proximity to said discharge outlet, said discharge outlet being of sumciently small cross sectional area to create pressure within said duct forcing air into the receptacle through the opening in said member adjacent the discharge outlet, the action of the air passing through the duct causing the entry of powder into the duct through the opening in said member adjacent the inlet opening and resulting in the spraying of the powder and air on leaving the discharge outlet.

HENRY J. BERENSON.

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