US2529827A - Screen for paint guns - Google Patents

Description

Nov. 14, 1950 J. D. YARNELL 2,529,827

SCREEN FOR PAINT GUNS Filed Aug. 22, 1945.

IN V EN TOR. dbH/V 0 VAR WELL.

MWW/M'V Patented Nov. 14, 1950 UNITED STATES PATENT OFFICE SCREEN FOR PAINT GUNS John D. Yarnell, Seattle, Wash; Application August 22, 1945,.seria1 No. 612,062..

This invention relates to screens for paint guns, and particularly to screens for suction tubes when extended obliquely through the receptacles containing the material to besprayed.

In the operation of spraying paints and lacquers, a gun or spraying device is ordinarily used with a very small nozzle connected with a suetion tube extended down through a cover on the receptacle in an oblique direction to a lower corner of the receptacle to suck up all of the material, when the receptacle is to be tipped to one side. In order to prevent any clogging of the nozzle it is important that the materials be screened before entering the mouth of the tube.

It is important for free flow of paint that the screen be supported in spaced relation from the mouth of the nozzle and in spaced relation from the Walls and bottom of the receptacle, and that it provide a surplus quantity of screened material at all times availableto be drawn upward by the tube.

Any screen used, must be supported by the tube, and difficulty is found in attaching a suitable screen to the oblique portion of the tube, to extend beneath the mouth thereof, and still permit the turning of the tube within the receptacle when the cover to which it is attached, is screwed down upon the ordinary threads on the top of the receptacle, for air tight seal.

It is also important that the top of the screen device be relatively small to. prevent'the paint and material from settling and congealing thereon provide a screen in the general form of a'cone, which may be adjustably connected to the oblique portion of the tube, by a resilient collar at the topof the cone. It is another object to provide the sides of the cone of different lengths, so that the longer side may be supported over the oblique wall of the tube, and the shorter side stand in extended relation therefrom, and in spaced relation above the bottom of the receptacle, and free to swing above the base of the receptacle when the tube is connected to the receptacle by the turning and threading of the cap thereon,

It. is. a further object to provide a simple and efficient method, for laying out and forming the parts of the cone, and for connect ng the parts to. eachother, and for connecting the cone. to. the tube.

With these and other objects to be hereinafter stated,..;I have illustratively exemplified mv invention by the accompanying. drawing, of which:

Figure-1 is a front elevat onal 'ViPW with parts broken away and with parts in section of a-paint receptacle, a suction tube therein having an oblique portion, and a conical strainer of my invention on said oblique portion;

It is therefore an object of this invention to 2 Claims. ('01. 210

Fig; 211s an enlarged fragmentary elevational view with parts in section of said suction tube with. myconical strainer thereon;

Fig; 3.is an enlarged sectionalview taken substantially on broken line 33 of Fig. 1; s

Fig. l'is a plan view of a blank, which maybe employed in providing the completed strainer of the other figures; and. i i

Fig. 5 is a fragmentary sectionalview showing a manner of securing together the. sides and bottom of my strainer. V

Likecharacters on the differentfigures represent like parts.

The letter A indicates any. ordinary pot or receptacle in which any supply ofpaintor lacquer may be provided onremoval of the cover B, which is threaded upon the neck of the .pot. A suction tube C is attached through the covenand is pro.- vided on its top with a sprayingnozzle D. A handle E with. an ordinary trigger,F and an air connection tube G enables the operator to use the gun in the ordinary manner. V

I Thetube C is ordinarily bent atsome point be;- low the cover, in an oblique direction shown as portion Band extended to near one outer edge of the bottom 1 of the potion draining approxie mately all of the paint therefrom when the pot is tipped toward one side for that purpose by the operator. v In order to prevent the. nozzle. from clogging fromany particles as congealed paint and lacquer, and to assurea unifornrflow .of the paint orlacquer from the nozzle a special form of fine meshscreen is provided.

This screen is in.the general form of. a cone with. perforated walls in spaced relation fromthe tube 6 and in spaced relationbelow the lower end 9 .or. mouth of the. tube, to provide a relatively large enclosure for screened material into the mouth of the tube. The .top, apex or vertex of the cone has an open neck II) for disposition upon the angular port on ofthe tube and the. edges. of the .screen are foldedor. rolledinward and downward to provide a. resilient collar II which permits the, neck to be pressed up over the tube to a desired position; but when released from manual pressure the collar gripsthe tube and sustains the screen in the desired position.

i One sideor portion I 2 of the cone. is supported partly by resting over the angular portion 6 of thetube, and the op osite side or wall l3 isdisposed, on a lesser s ope and approximately in a perpendicular line between the neck. I0 and the rim. E4 of. the bottom I5 of the cone which bottom i in spaced relation above the bottom of the pot, to p rm t free flow of the paint material throu h the side and bo tom of the cone in the chamber within the, same for free flow into and from the suction tube. This formation of the conical screen is important because it must be collar at the top of the cone to be dislocated from the desired position on the tube.

Fig. 4 shows a preferred form or blank of a piece of netting or screen which may be folded or formed into the cone shown in the other figures. The portion I I of the completed screen is formed by the portion designated as II in Fig. 4 which isdefined by the upper edge and the parallel edge indicated by a dot and dash line. The portions I6. which are folded back on each other in Fig. 3, are indicated by portions I6 in Fig. 4 and are bounded by the lateral edges and the dot and. dash lines shown. The portions I! which lie adjacent the ed es of the bottom I5, as indicated in Figs. 2 and 5, are designated as I I in Fig. 4 and are defined by the bottom edge of the blank and the parallel dot and dash line.

In forming the conical strainer of my invention, the portions I6 are turned in opposite directions and then the blank is rolled and the portions I6 are caused to hook together to maintain the conical form. Next the portion I I is bent downwardly and inwardly to provide a tapered sleeve like portion so that the same will resiliently engage the tubular portion 6 and provide for adjustable holding of the screen by said tubular portion. Thereafter, the portion I1 is bent outwardly. Next the rim I4, which is circular as indicated in Fig. 3, is placed so that the portion I1 and the edges of the bottom I are within the rim I4. Then the rim M has its flanges pressed together to rigidly secure the bottom I5 to .the conical screen. The portions IE not only function to-hold the lateral edges of the screen together but function as a stiffening member for the final screen.

A plane intersecting a cone at an angle to the normal base of a cone will provide an ellipse as is indicated by the ellipt cal shape l8 shown in Fi 3. As it is desired to have a round bottom and around ring I4, the s d wa ls of the screen are bent and a slight hump I9 will appear. I It is desirable that the portions I5 be provided and that they not be soldered together so that the entire surface area, with the exception of the ring I4, may function as a strainer. Also grooves are preferably provided and they function as stiffening membersf Whi e I have shown the bottom I 5 substantially at right angles to the wall I3 of the cone, it is to be expressly understood that this is not a limitation but is an illustration of a construction best suited to a device or paint pot having a bottom wall which is at right angles to the side walls. Obviously if a paint pot has a convex bottom, the angle of the bottom I5 to the side wall I3 can be changed to fit such shape of bottom. Such convex bottoms are not uncommon in fruit jars which. are commonly employed as paint pots where paint is to be sprayed.

Obviously changes may be made in the forms, dimensions, and arrangements of the parts of my invention, the above setting forth only a preferred form of embodiment.

Having described my invention, I claim as new;

1. A screen for obliquely disposed suction tubes for spraying paint and lacquer liquids from a receptacle, comprising a relatively fine meshed flexible sieve having substantially a conical configuration in outline to prevent the liquid congealing on the top thereof when the supply is lowered, and to screen the material to be sprayed, the apex of the cone being provided with an aperture for entrance of the tube, the edges of the aperture being rolled down and inward for a collar for adjustably retaining the screen upon the tube, one side portion of the cone adjustably disposed upon and along the upper wall of the oblique portion of the tube for support, and the other side portion of the cone being shorter, to permit the cone to be turned around by the tube within the receptacle and above the base thereof when the tube is revolved for attachment to the receptacle top, a bottom sieve attached across the lower edges of the cone walls in spaced relation below the mouth of the tube and above the floor of the receptacle to provide free passage of the liquid from the receptacle through the meshes of the sides and bottom of the cone. the outer edges of the bottom of the cone and the lower edges of the sides thereof being crimped together for attachment and rigidity, and the sides having grooves pressed therein for further rigidity of the cone, while suspended in the receptacle for spraying.

2. In an apparatus for spraying liquid paints and lacquers, including a suction tube projected downward from the center of a cover for a receptacle for the liquid, and having its lower portion, bent obliquely toward the lower convergence of the walls and bottom of the receptacle, for emptying the same, in combination with, a conical screen for preventing paint particles from clogging the nozzle of the tube, the cone being provided with an opening and collar at its apex for adjustable connection with the tube, a screen across the bottom for enclosing the base of the cone, one side of the cone being adapted for lying along the upper wall of the oblique portion of the tube for support, and the other side of the cone being shorter, to permit the cone to be turned around within the receptacle together with the tube and above the bottom of the receptacle, and to support the bottom of the cone in spaced relation above the bottom of the receptacle, for free circulation of the liquid around and beneath the screen and for passage of the liquid through the meshes thereof.

JOHN D. YARNELL.

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

UNITED STATES PATENTS Number Name Date 79,422 Watson June 30, 1868 602,941 Harvey Apr. 26, 1898 730,356 Emond June 9, 1903 1,554,924 Shapiro Sept, 22, 1925 2,175,714 Brown Oct. 10, 1939 FOREIGN PATENTS Number Country Date 655,207 France Apr. 16, 1929 679,291 France Jan. 6, 1930 733,256 France July 4, 1932 814,247 France Feb. 21, 1936

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