US2461611A - Gun for spraying powder - Google Patents

Description

Feb. 15, 1949. D. L. LOTT 2,461,611

GUN FOR SPRAYING POWDER Filed March 3, 1947 III lm'iimlll'lm "in II] III III! 1h INVENTOR 04v/0 A. Low- A TTORNE 1/.

Patented Feb. 15,1949 V v 2,461,611

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Figure 1 is a side eIevation o'f'the devl'ce; material so far as the operation o'fthe dfust dls 25 are jointed together at point 21, as shown in Figure 4 and therefore air or othermaterial passing through the tubes will combine and be discharged through the outer end of tube 25, which projects beyond the point 21. A removablecap 28 serves to close the outer end of the housing '8 and is held in place by means of two rods 29 and 38 that are connected at one end with cap 12 and after passing through cap 28 are provided with wing nuts 3!, which serve to urge the cap 28 into airtight sealing engagement with the end of the housing. If desired, a suitable gasket may be provided between the inner surface of cap 28am! the end of the cylinder ill, but since such gaskets are common for this purpose, it has not been illustrated.

Referring now to Figure. 3, it will be observed that the passage from manifold l1 branches, one branch communicating with pipe 24 and the other with pipe 25. -At the point where these two branches begin, a valve 32 is provided and mounted for rocking movement about pivot 33. One position of valve 32 has'been indicated by full lines and another position by dotted lines. When valve 32 is in the full line position shown in Figure 3, any air leaving manifold i! will be directed downwardly through the connector 28 and thence outwardly through tube 25. The latter is provided with an opening 34 adjacent which is located a screen 35. The pivot on which valve 32 turns extends through the wall of tube 24 and into a sealed chamber 38% whose wall has been designated by reference numeral 31. Secured to the end of pivot 33 that terminates in chamber 38 is an arm 38 to the end of which is secured a weight 39. In the-finished device, compartment 36 is entirely closed so that no dust or air from the outside can enter the same. It will be apparent that if the dust gun is held in such a way that the end towards the left in the drawing is upwardly inclined, the action of weight 39 will move valve member 32 into the full line position shown in Figure 3 and therefore direct the current of air through pipe 25, whereas, if the dust gun is held in such a position that the end to the left is downwardly inclined, weight, 39 will move into the dotted line position shown in Figure 4 and this, in turn, will move valve 32 into the dotted line position, thereby closing the passage to tube 25 and opening the passageto tube 24. v

A partition is provided to the rightof man1- 'fold IT- as shown in Figure 3 and this forms a wall that prevents any powder from getting into that space between the manifold and partition "40. Opening 34 is positioned to the left of partition 48 "asshown most clearly in Figure 4. Cap 28 may be removedentirely from the housinglfor the purpose of charging the chambenwith powder or it may be provided with an opening having a removablecover 4!. A short tubular discharge nozzle 42 is positioned in an opening in cap 28 inaxial alignment withtube 25 and is adjustthrough the outer end of tube 25.

able inwardly and outwardly for the purpose of adjusting the rate of discharge, of the powder.

Let us now assume that the parts are assembled in the manner above described and that the compartment between cap 28 and partition 48 is partially filled with a. fine powder. The powder containing compartment has been designated by P so as to be more readily referred to. If the fire or other object to which the powder is to be applied is positioned :'at a low elevation, the gun is pointed downwardly, whereupon weight 39 and arm 38 operate to move valve 32 from the full line to the dotted line position. The air will then-pass through tube 24 and into tube 25 at point 21. Since the gun is pointed downwardly, the powder will naturally be resting against the inner surface of cap 28 and the stream of air emerging from tube 25 and escaping through tube 42 will entrain powder which will emerge in a stream and can be directed to whatever object may bedesired. If the gun is used for applying an insecticide to plants,-the stream of powder will naturally be directed onto the plant and if. ;fire extinguishing powder is used, the stream of powder will be directed onto the fire. If, for any reason, the objectto which the powder is to be applied is at an elevated position, the operator will naturally point the gun upwardly, whereupon weight 39 and arm 38 will move valve 32 to full line position shown in Figure 3. Any air that is nowdischarged from the pump or other source of air under pressure will pass through the part 28 through the screen and past opening 34, being discharged finally since the powder is resting against the outer surface of partition 48 when the gun ispointed upwardly, some of the powder will enter tube 25 through opening 34 and will be carried along by the stream of air and finally discharged from the gun, together with the air stream in which it is entrained. A screen 35 is positioned to the right of opening 34 for the purpose of preventing powder from enteringthe connecting-passage 28 when the gun is not in use.

In Figure 3 the flat valves 23 have been shown as positioned inside of the cylinder where they would be likely-to be interfered with by the cup leathers. ,In order to prevent such injury, the piston rod has been provided with a shoulder-43 and a projection 44 that serve as stops preventing the piston from engaging the valves. Any other suitable arrangement may, of course, be used and other-equivalent valves may be substituted for the ones shown.

From the above description, it will be apparent that the dust gun that forms the subject of this invention is of such aconstruction that it can -be used either for directing powder upwardly or downwardly and that the construction is such that the tubescan not readilybe'come clogged during operation, or during thetime when the gun is being transported.

"Wallis serves" the double iunction 'bian end closure for the 'p'ump'cylihder' ahd "anen'd' wall for the dust compartment P." In the er'nbpdi inent illustrated, wall '40 art san end well of the dust chamber, its presence, however. is due to the fact thatin its absence a gre ter quantity of powder would benecessary when the gunis operated in anupwardly directed position. Wall 43 may, however, be dispensedwith and ppening 34 brought closer .to partition I3 which can be e -b qbv sh ees- Having described the invention what is claimed as new is:

1. A dust gun comprising, an elongated housing closed at both ends, an air manifold near one end, a branched discharge opening in the Wall of the manifold, a tube extending from one of the branches to a point near the other end of the housing, the wall of the housing having a dis charge nozzle in substantial axial alignment with the open end of the tube, a second tube communicating the other branch of the discharge opening with the first mentioned tube at a point adjacent the discharge end of the latter, a valve means positioned in the discharge opening for directing air from the manifold to either tube, a gravity responsive means for positioning the valve to direct an air stream into the first mentioned tube when it is upwardly inclined and into the second mentioned tube when the parts are downwardly inclined, the first mentioned tube having its wall provided with an opening adiacent the valve, and means for supplying the manifold with air under pressure.

2. A dust gun comprising an elongated housing forming a dust compartment, walls closing the ends of the housing, an air manifold adjacent one end Wall, the inner wall of the manifold having a branched opening, a tube having one end in communication with one of said branches, the other end terminating a short distance from the inside of the other end wall, a tubular discharge nozzle extending through the end wall, terminating adjacent to and in substantial axial alignment with the open end of the tube, a second tube communicating the other branch of the manifold opening with the first mentioned tube, the first mentioned tube having an opening in its wall adjacent the end in communication with the manifold opening branch, means for supplying the manifold with air under pressure, meansfor directing air from the manifold into the first mentioned tube when the gun is upwardly inclined and into the second tube when it is downwardly inclined, said means comprising a valve member in the branched opening, and means comprising a gravity responsive operating device for moving the valve member in response to the angular position of the gun.

3. A dust gun comprising, an elongated housing whose ends are closed by transverse inner and outer walls, the inner wall being transversely inclined, a closed manifold chamber positioned outside of the inclined end wall, the wall of the manifold adjacent the inclined wall having a branched discharge opening, means for supplying air under pressure to the manifold, a tube having its inner end in communication with one of the branches through an Sl-shaped connector, the other end of the tube terminating adjacent the inner surface of the outer wall, a tubular nozzle extending through the outer wall in axial alignment with the tube, the wall of the tube having an opening positioned adjacent the inside of the inner end wall, and a gravity responsive valve mechanism for directing air into the first mentioned tube when the gun is upwardly inclined and into the other tube when the gun is downwardly inclined.

DAVID L. LOTT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 954,398 MacGregor Apr. 5, 1910 1,194,781

Pearsons Aug. 15, 1916

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