US2196800A - Spraying device - Google Patents

Description

April 9, 1940. A. KRAu'rzB'l-:RGER

SPRAYING DEVICE 5 Sheets-Shes?I l April 9, 1940. A. KRAUTZBERGER SPRAYING DEVICE Filed Janl 6, 1937' 3 Sheets-Sheet 2 Figfl i Ap 9, 1940. A. KRAuTzBERGl-:R

SPRAYING'DEVICE s sheets-sheet s Filed Jan.l 6, 1937 Fig'. 15

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Patented Apr. 9, 1940 UNITED STATES SPRAYING DEVICE Albert Krautzberger, Holzhausen,A near Leipzig, Germany Application January s, 1937, serial No. 119,350

In Germany January` 9, 1936 4 Claims.

spraying 4material to the nozzle of paint and other spraying devices, and has for its object to insure feeding at any position of the spraying device or pistol so as to prevent interruption of the stream of material and thereby provide for satisfactory operation of the spraying outt at any position thereof.

'I'he invention is particularly applicable to spra'ying devices or pistols involving suction or flow feed, wherein the material to be sprayed is kept in a container disposed below or above the axis of the nozzle and is either sucked up by -a compressed air current or flows to the nozzle.

The known types f such spraying pistols are open to the objection that greater inclination of the device relative to the axis of the nozzle causes interruption of the stream of spraying material and at the moment of interruption muddy con' stituents of the material are entrained by the air passing through the opening provided.

Various proposals for preventing the injurious interruption of the stream of material at a certain inclination of the spraying device have-been made already, but they permit the use of the device at a certain inclination only after an adjustment has been made which must be repeated at every considerable variation in inclination.

'Ihe invention solves the problem of permitting satisfactory operation of the device /at any inclination thereof and thus considerably extending the range of uses of such spraying and painting devices or providing new fields of employment therefor in an extraordinarily -simple and absolutely reliable manner. The invention attains its object by supplying the spraying nozzle with material not directly from the reservoir but from a compartment which is separated from the reservoir communicating with the outer air and wherein at each variation of the spraying direction an amount of spraying material remains that excludes the possibility of an interruption of the spraying jet. This is attained by causing the compartment to be in communication with the reservoir by a duct varying in construction according to the manner of arrangement of the reservoir. 'Ihe charging compartment has a relatively small holding capacity compared with the reservoir and in thepreferred embodiment of the invention is separated from the latter by a removable partition which permits cleaning of the entire device and the circumference of which possesses a recess of any desired shape for establishing communication between the two partial containers.

(Cl- 299-140) Thisinvention relates to a device for feeding By way of example, the invention is illustrated f in the accompanying drawings, in which Figures 1 to 3 representa fundamental embodiment of the invention and show a longitudinal section of.A the spraying head of a paint spraying device 5 having a, cylindrical reservoir disposed vertically to the -axis of the nozzle in different operating positions; Figs. 4 to 9 show details of the removable partition for the reservoir in various forms;

Figs. to 12 show a modified construction, in 10 which the reservoir is horizontally arranged above the axis of the nozzle and provided with a different form of partition, in various operating positions; and Figs. 13 'to 15 show a spraying pistol in diierent working positions, which-is op- '15 ferated on the suction principle.

In the drawings, a is the spraying device; b, the reservoir for the spraying material; c, the partition subdividing the reservoir bvinto the actual charging space h and the supply space h', 20 which spaces are in communicationby means'of the opening d' shown in Figures 1 to 3'and 13 to 15.

f The partition c is preferably provided with a handle member k extending into a knob as shown in Figures 1, 3, l0, 11 and 12. i designates the removable cover of the reservoir b yhaving an opening l for admitting air. The screen s in the container b-prevents the entrance of dust through the opening l, and the letter' o designatesv the 30 jet needle of the device.

The mode of operation of the new device brieilyv described above will be apparent from an observation of the drawings and consideration of the following functional description. 35

In the construction shown in Figs. 1 to 3 the.. axis ofthe container b is perpendicularly positioned relative to ,the axis of the nozzle, so that the partition c is parallel to the axis of the spraying nozzle g. In the operative position shown in Fig. 1 with the axis of the nozzle g in a horizontal position, or nearly so, the Working method is similar to that ofthe known devices. In the position shown in this figure the partition c serves no useful purpose, as the stream of material cannot be interrupted, and may be removed when spraying vertical surfaces. During operation the partition c is secured by placing it on a slight conical contraction in the lower part of the reserv'oir b Where it is held by vclamping 50 or frictional engagement.

If the device is brought into the position shown in Fig. 2, the stream of material would unavoid- 'ably and instantly stop without the presence of the partition c, since it would fill only the lower 55 portion of the reservoir b. The partition c prevents interruption of the stream and has the further eiect that the compartment h separated thereby remains constantly lled with liquid which flows from the reservoir b through the channel d preferably located at the lowest point of the partition c during spraying in upward. direction and thus practically shut oi! vby the spraying material until the containerb is com pletely emptied.

In this connection, Fig. 2 indicates another improvement with respect tothe sealing of the partition c held only by clamping. Particularly in case of very easy-flowing materials leaks at ,the circumference of the partition-c secured by clamping might cause air rto be entrained and produce irregularities in spraying. Fig. 2 shows how this can be prevented in a very simple man'- nerwithout resorting to special packings by constructing the handle member k of the partition c as a preferably downwardly bent transverse separating wall and the actuating knob as front closure ofa receptacle formed by these members and the partition c within the container b, which will remain filled with liquid even during inclination of the pistol and thus effect additional fluid sealing along a large part of the circumference of the partition. Such an arrangement is required, however, only in case of very mobile material, as otherwise the viscosity thereof prevents the passage of air at the circumference of the partition c.

Fig. 3 shows how during spraying in downward direction after the tilting of the pistol the relatively large amount of liquid remaining in the receptacle h constitutes a safe seal against the the space h from vns -ing in upward entrance of undesired air to the nozzle .even after partial consumption kept in the main reservoir b having an additional sealing effect along a major portion of the circumference of the partition c.

Figs. 4 to 9 show, respectively, in lateral elevation and in plan different possibilities of construction of the removable partition c. According to Figs. 4 and 7, the hole d' has rectangular shape; in Figs. 5 and 8 it is subdivided into three single channels; and in Figs. 6 and 9 it forms a segment-like clearance in the round partition. Figs. 6 and 9 further indicate the construction of the handle member Ic as transverse separating wall, as described above with reference to Fig. 2.

Figs. l0 to 12 show the.eifect of the arrangement of the partition c in a reservoir b along the axis of the nozzle and parallel or inclined thereto. 'I'he construction of the partition is somewhat altered to prevent the liquid contained in flowing back into the reservoir b during vertical spraying. For this purpose the channel takes the form of a tubular projection d which extends into the-receptacleh. The effect of this arrangement can be noted by glancing at the drawings. When spraying takes place in downward direction (Fig. 11), the channel of the tube d" insurescontinual free flow of the spraying material to the nozzle a; during spraydirection (Fig. 12)- the tubular projection d", hen the pistol is tilted, causes a considerable amount of liquid to remain in the space h which then feeds the nozzle 0. In the embodiment shown in Figures 10, l1 and 12 the channel is positioned in the partition at such a point that the pistol must be tilted longer after longer use in horizontal position or when the supply of liquid in the space h is exhausted, so as Vtion principle.

thereof, the spraying liquid( to cause the liquid to flow from the main supply space h' into the space h.

Figs. 13 to 15 show the application of the invention to 'a spraying pistol operated on the suc- Without the use of the partition c it would be impossible to work for instance with the ypistol in the position shown in Fig. 14, since the stream of liquid would be interrupted at once.

The partition c, provided in this case is at the end of the suction pipe m in such manner that the receptacle h in the position according to Fig. 14 forms a sort of extension of the suction pipe m, so that the latter extends into the spraying liquid even at the lowest position shown.

In the position according to Fig. 15, when spraying is carried out upwardly, the suction pipe m, owing to the extension formed, is supplied with a suiiicient amount of liquid to permit operation of the device for some time. After the liquid in the receptacle h is exhausted, it is only necessary to tilt the pistol once to render it operative again also'in vertical spraying direction.

With respect to the last-mentioned construction, an important feature thereof is to form the air inlet 1through which the reservoir b is incommunication with the outer air, not as a simple hole but with a tubular projection n that is movable to prevent liquid in the reservoir b from passing through the opening 1 by causing the tubular projection at corresponding tilting positions to be moved into an upwardly opening position (Figs. 14 and l5).

A further essential feature of all embodiments shown is to render the chamber h relatively narrow and thus impart to it a channel-like form. As will be seen from the drawings, it is automatically refilled during operation of the new device, when the latter is alternately inclined in upward and downward directions, as is always the case in ting or other spraying work.

The invention is not restricted to the embodiments shown and described, but may be varied in many ways without departing from its fundamental idea.A

I claim: y

1. In a paint spraying gun continuously operated by means of compressed air, a nozzle, a substantially cylindrical shaped reservoir arranged adjacent said nozzle adapted to hold a supply of spraying fluid, the wall of said reservoir having an inwardly directed conical contraction, a partition removably arranged within said reservoir and wedged into engagement with said contracted .Wall so as to provide a charging space and a supply space, a duct extending from said nozzle into said charging space, said partition having an opening therein, said opening being so arranged with respect to said partition that fluid may flow from said supply space to said charging space in one position of said nozzle, said opening being so positioned as to prevent the return of the fluid contained in said charging space to the supply space in other positions of said nozzle whereby the fluid in said charging space is fed to the nozzle through said duct.

2. Apparatus according to claim 1 characterized by the feature that the partition consists of a disc in which at least a passage for the spraying fluid is provided and having a handle member for facilitating the removal thereof.

3. In a spraying device, a nozzle, a cylindrical reservoir for storing a supply of spraying material, said reservoir being arranged along the axis of the nozzle and in the direction thereof, a partition in said reservoir dividing the same into a vdirected downwardly,

charging space and a larger supply space, said partition extending substantially perpendicular t'o the axis of said cylindrical reservoir and having a channel therein which is positioned at the maximum possible distance from the axis o1' the nozzle, a tube carried by said partition arrangedadjacent said channel, said tube extending into said charging space, a duct providing communication between said nozzle and said charging space, whereby fluid will ow from said supply space to said charging space when the axis of the nozzle is and said tube extending into the charging space to prevent fluid in the charging space from returning to the supply space.

4. In a spraying'device, a nozzle tube having an orifice for the projection of uid to be sprayed, a reservoir for a supply of liquid to be sprayed having the wall thereof extending perpendicular from the axis of ysaid nozzle tube and in communication with said nozzle'tube, a partition arranged substantially parallel with respect to the axis of the nozzle and frictionally engaging the wall of said reservoir dividing the same into a supply space and a charging space adjacent the axis of the nozzle, and said partition having an yopening therein arranged at a maximum distance from the orce of the nozzle.

ALBERT KRAUTZBERGER.

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