US 2532187 A
Description (OCR text may contain errors)
Filed Jan. l2, 1945 Patented Nov. 28, 1950 UNITED STATES PATENT OFFICE MULTIPLE FLUID AIRBRUSH Jens A. Paasche, Chicago, Ill.
Application January 12, 1945, Serial No. 572,516
1 Claim. l
The present invention relates to a multiple fiuid airbrush of the type capable of projecting a plurality of diiferent liquids.
I-Ieretofore it has been found convenient in certain spraying and coating operations to apply a coating by separately spraying several of the ingredients. For example in the application of latex, two diiferent liquids are applied to provide a more satisfactory coating. Similarly in the application of certain paints and plastic compounds two different liquids are projected in a mist toward the object to be coated to provide a more uniform and more satisfactory coating. Heretofore relatively complicated double spray heads have been provided for such operations. While in certain instances it may be of some advantage to employ such arrangement, in many other instances it is deemed that such complicated structure is diicult to handle and is expensive to manufacture. Therefore in accord ance with the present invention a relatively simple arrangement is provided whereby a plurality of iiuids are readily controlled in order to project a coating and the like.
It, therefore, is an object of the present invention to provide an improved multiple duid airbrush which is relatively simple to manufacture and to operate.
Other and further objects of the present invention subsequently will become apparent by reference to the following description taken in connection with the accompanying drawing wherein Figure 1 is a side View of a multiple fluid airbrush constructed in accordance with the present invention;
Figure 2 is a cross sectional view of a portion of the apparatus shown in Figure l as seen in the direction of the arrows along the line 2 2;
Figure 3 is a cross sectional view of the apparatus shown in Figure l as seen in the direction of the arrows along the line 3 3;
Figure 4 is a cross sectional view of Figure 1 looking forwardly along the line 4--4 in the drection of the arrows;
Figure 5 is a perspective view of the cylindrical body portion of the apparatus shown in Figure l;
Figure 6 shows a handle supporting element.
Referring to the drawing it will be seen that there has been provided a multiple fluid airbrush comprising a generally cylindrical body l0 which has a forwardly threaded portion I2 and a rearwardly threaded portion I Il. Extending toward the rear of the gun beyond the threaded portion I4 is a coaxial member I6 of lesser diameter ill) arranged to serve as a support for a valve actuating mechanism. The body IB is provided adjacent its underside with an elongated slot I8 connected to a narrower slot 2B. The narrower slot 2B receives the handle supporting member 22 which extends through a suitable handle 2A readily secured in position by a nut 26 engaging the threaded portion 23 of the supporting member 22. Adjacent the upper end of the handle 24 there is provided an adjusting screw 3Q which controls the degree of actuation of a trigger 32. The trigger is pivotally mounted from a cross pin 3f! at an intermediate point on the body i0. The trigger 32 has at an intermediate point a recess 36 which engages the end of an actuating member 38 having at its other end a ball portion 4t supported within a socket member 42. The socket member 62 is arranged at the end of a cylindrical member or rod lili connected to a valve member 46. The valve member :it is biased toward closure by a suitable spring 48 bearing against a screen 5B. The valve it cooperates with a valve seat 52 formed in a valve supporting member 54 which engages the threaded portion l i of the body lil. The screen 5B against which the spring 18 bears is retained in position by a threaded ring 55. outer end is adapted to be engaged by a threaded ring nut 53 for connecting a suitable iiexible conduit or hose @il thereto. rlhe hose or conduit 6i) is arranged to be connected to a fluid under pressure.
The space between the end of the cylindrical bodv member l! and the inside of the valve supporting member 55 which forms a chamber 62 is connected by a conduit S4 shown in Figure 1 to a coaxial opening 65 more readily seen in Figures 2 and 3. The forward end of the body ID is connected by a threaded ring E8 to a suitable coupling member 'lll which engages a multiple passage head l2. The multiple passage head has a passage 'ill communicating with the coaxial passage @t of the body li). The passage i4 terminates in an internal nozzle 15. The other fluid passages 'i8 and Si! are connected by a suitable coupling means BZ and 84 to iiexible iluid conduits 86 and t8 each of which is connected Ato a different uid source of liquid. Interposed in the fluid conduits 'i3 and 3@ are valve seats dii and 92 adapted to be engaged by valves 94 and 95. Each of the valves 94 and 96 is manually adjustable so that the amount of liquid or fluid passing through the conduits 18 and 80 may be controlled thereby permitting a different propor- The member 54 adjacent its` tion of the dilerent fluids to be projected by the apparatus.
Just above the valve seats 90 and 92 the member 'I2 is enlarged to provide annular chambers 98 and |00 communicating with forwardly eX- tending fluid passages |02 and |04. The passages |02 and |04 terminate adjacent the interior nozzle 16. The combining nozzle |05 is retained in position by a suitable fastening or couplingring 498. .The nozzle |06 serves to project the two liquids or fluids supplied from the conduits 18 and 00 by virtue of the fluid proj ected through the interior nozzle 16, which iiuid is controlled by the manual actuation of rthe trigger 32. The valve head 94 is supported by a Valve stem I0 which is surrounded by a resilient gasket-like member H2. The valve stem H0 is adjustably positioned by virtue of the threaded portion of the valve position adjusting vmember which terminates in a calibrated thumb screw Hcooperating with a suitable graduation such as H9 on the `side of the member '12. Theresilient rubber-like gasket E52 serves to maintain the valve in any desired manually adjusted vposition. Similarlythe valve head 99 is secured to a valve-stem |29 which in turn is surrounded by a'resilient retaining gasket or member |22. A threaded portion |24 interconnects the valve stem with the manually adjustable screw member |26. l
In operation the conduit 90 is normally connected to a source of fluid such as air under pressure. Each of the other conduits 'iii and 99 is connected to a suitable source of iiuid or liquid of a characteristic dependent upon the type of coating to be applied to an object. By adjustment of thescrew members H' and E25 the proportion of the two materials or fluids may be regulated so as to provide the desired characteristlcs te the coating. The yprojection of the Vcoating material is started and stopped by Vmanual actuations of the trigger 32 which controls the opening and closing of the valve comprising the valve seat 52 and valve head i9 interposed between the fluid conduit 09 and the huid conduit 9G contained within the body i9. The amount of iiuid under pressure supplied by the actuation Vof the trigger 32 is controlled by the adjustment of the stop screw 39 positioned on the forward Suriaceof the handle 24. The handle 24 which is held in position by the bolt-like member 22 is retained in position by the nut 25 engaging 'the threaded end portion 23 of the bolt-like member 22 In the other extremity the supporting -member 22 is provided with a head portion |29 immediately beneath which there is a reduced or recessed portion |39 so that the head will flt within the body i0 and the reduced recessed portionflts between the sides of the narrow slot shown in Figure 5.
While for the purpose of illustrating and describing the present invention a preferred embodiment has been shown, it of course will be appreciated that such variations are contemplated in the components and in their arrangements as may be commensurate with the spirit and scope ofthe invention dei-ined in the following claim. 'This invention is hereby claimed as follows:
Airemovable nozzle assembly for use with an air brush of the type having a valve controlled passage therethrough for a propelling fluid; and comprising an elongated head member adapted to be secured to the air brush and having a longitudinal fluid passage therethrough adapted for communication with the uid .passage in the air brush, said head member having parallel bores therethrough disposed on opposite sides of said fluid passage and extending transversely thereoi` and each adapted for connection to a material supply line, said transverse bores having valve seats intermediate the ends thereof and said head member also having material passages each communicating with one of said bores and extending forwardlythrough said head member on opposite sides of said fluid passage and opening at the iront end of said head member, separate valve members, one for each of said transverse bores cooperating with the seat therein for selective and permissive dierential control of the passage of material through said bores to said material passages, an internal nozzle member detachably mounted at the forwardend of said head member in communication with the longitudinal fluid passage 'therethrough and with the outer inwardly convergent surface thereof disposed .finwardly between the outlet ends of said material passages, and an external nozzle detachably mounted at the forward end of said head member exteriorly of the said material passages and having the inner wall surface thereof sharply converging inwardly in advance of the adjacent Vsurface of said internal nozzle to provide therebetween a confined mixing chamber with the inner wall surface of said external nozzle serving to sharply direct the material from the outlet ends oi" said ymaterial passages inwardly into said mixing chamber whereby the materials are mixed .therein before being propelled through the .second nozzle by the nuidunder pressure issuing trom said longitudinal Yfluid. passage.
JENS A. PAASCHE.
REFERENCES ill-EEB The following references are o record in the ile or this patent:
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FOREIGN PATENTS Number Country Date 291,630 Italy Dec. 22, 1931