US1239089A - Process of applying coating material. - Google Patents

Description

H. W. DAY- PROCESS OF APPLYING COATING MATERIAL.

APPLICATION FILED DEC. I6. 1916- Patented Sept. 4, 1917.

Inventor.

Herberi Wllay, b

fi i @3 3.

HERBERT W. DAY, OF WOLLASTON, MASSACHUSETTS,

ASSIGNOR TO SPRAY ENGINEER- IN G COMPANY, OF BOSTON, MASSACHUSETTS, A'GOBPOBATION OF MASSACHUSETTS.

PROCESS OF APPLYING COATING MATERIAL.

Specification of Letters Patent.

Patented Sept. 4, 191 '7.

Application filed December 16, 1816. Serial No. 137,435.

To all whom it may concern:

Be it known that I, HERBERT W DAY, a citizen of the United States, and a resident of Wollaston, in the county of Norfolk and State of Massachusetts, have invented an Improvement in Processes of Applying Coating Material, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to a process for applying coating material to surfaces. The coating, if a liquid, may be a paint, japan, varnis or other suitable coating medium, or it may be a solid in powdered form, and the material to which it is to be applied may be of any character, such, for example, as wood, metal or other material.

An important object of the invention is to effect by the described process the formation of a film maintained by capillary action and broken and projected by fluid under pressure.

Referring more particularly to the drawings wherein I have represented a tool or mechanism by which my process may be carried out;

Figure 1 is a side elevation, of such tool or mechanism;

Fig. 2 is a vertical section thereof;

Fig. 3 is a front elevation thereof; and- Fig. 4 is a section upon the line 4-4 of Fi f n accordance with my invention, I maintain a film of coatin material and discharge the material of sai film onto the obiect to be coated, by subjecting said film to the impact of a filmbreaking and discharging fluid which may be air or other suitabie medium. Preferably, the film is subjected to the im' pact of the film breaking and dischar ing fluid in a direction transversely to said lm.

The method, as hereinafter more fully set forth, may be carried out by many different types of mechanisms or otherwise, but for Y convenience of description I shall set forth in detail a tool or mechanism by which the said method is most effectively carried out.

The tool or appliance may be of any suitable material, but preferably it is metallic. The body 1 thereof may be of any suitable form and preferably it is provided with handle or extension 2 integral therewith an having an opening 2 permitting access to the valve operating lever 2". In the disclosed form of the invention, the said'operating lever is of general trigger form, but such construction may be widely varied within the scope and purpose of the invention. The body 1 of the tool is provided with a passage 3 for air or other suitable fluid under pressure and with a passage 4 for the paint or other coating liquid or powder, which also may be supplied under suitable pressure if desired, or through gravity. To this end I have provided supply pipes 5 and 6, tapped into the passages 3 and 4 as represented in Fig. 2.

Controlling the air supply passage 3 is a valve, which may be of any suitableform but which is herein represented as an axially movable member 7, positioned within a valve casing 8, tapped into the body 1 at 9. The said casing 8 is provided with a suitable passage 10 for the entrance of the air, and with a discharge passage 11- through which the air may enter a passage 12 herein represented as leading in an inclined direction to a through passage 13, wherein is positioned a needle valve 14 threaded at 15 for adjustment and provided with a knurled adjusting disk or member 16. The said valve 7 is normally held closed by a coiled spring 17 positioned between a washer 18 and the inner surface of the valve casing 8. The inner portion of the said valve 7 is tapered as indicated at 19, and said valve is provided with an axial. prolongation 20, of spindle or pin-like form, extending into a recessed portion 21 of the operating valve 22- mounted within a suitable recess 23 in the body 1 of the tool and having the operating lever 2 previously referred to.

The liquid or other coating supply passage 4 is controlled by a valve, preferably generally similar in construction and mode of operation to the valve that controls the air supply. Herein for the purpose, I have represented a valve casing 24, having a port 25 for the discharge of the coating material, and a smaller port 26 through which said material enters the valve casing. Said port 26 is controlled by a valve 27, preferably of a construction similar to the valve 7, and normally held closed by a coil spring 28. The said valve 27 is provided with an axial extension 29, entering a recess 30 of the operating valve 22.

The construction and operation are such casing 31,-here V controls the said opening 37.

that upon movement of the operating lever 2" in the proper direction the valves 7 and 27 are opened so as to dischar air and coating material throu h the va ve casings 8 and 24. If desired, may provide means to adjust or vary the lengths of the extensions 20, 29, so as to adjust the sequence of the opening of the valves 7, 27. While I may so adjust the parts that either-of said valves is opened first, I preferably so construct the parts that the valve controlling the assage 3 is opened first.

I desired, the valve 27 may be constructed like the valve 7, which is so positioned and constructed that the entering air tends to close the valve. Any suitable valve may, however, be employed.

The passage 13 for the compressed air or other suitable fluid extends through the body 1 of the tool and upon the forward end of said body is mounted a cap-like valve shown as having a threaded portion 32 tapped into the recessed portion 33 of the bod -The said valve casing 31 is provided -wit a tapering discharge passage 34 controlled by the said needle valve 14.

Outside of the valve casing 31 is a member 35 hereinshown as having a concaved or curved inner surface 36 and a small central opening 37 in line with the axis of the needle valve 14. Said needle valve 14 also The said member 35, which may be of general caplike form, is herein represented as internally threaded at 38, and as received upon the externally threaded ortion 39 of'the tool body. The length 0 the threaded portion 39 is sufficient to permit adjustment of the member 35, andI preferably provide a lock nut 40 in the rear of said member 35 to maintain a fixed adjustment and to prevent leakage by compressing the threads 39.

The interior of the member 35 is in communication with the interior of the valve casing 24 by means of a passage 41.

If desired, and as herein shown, the tool bod 1 may be provided with a supporting him 42 of suitable formation and herein 'replresented as integral with the body of the too In carrying out my method by the herein disclosed tool or mechanism, the coating material entering the member 35 forms a film upon the thickness of this film ma varied by adjustment 0 Such film is constantly formed and maintained by capillary action between the two surfaces which are brought close enou h together to insure such action. The a r enterin through the passage 3 breaks through the mat the central portion of the cap and discharges the same upon the work in very fine globules. Said film is constantly broken by the air or other blast, but is conbe very readily tially transverse current, whereby inner surface thereof, and the the member 35.

stantly restored through the action of capillarity. Hence the coating material may be merely under suction due to capillary action. The maintenance of the supply of coating material is not dependent upon the presence of the air blast: which is used merely to break the film and discharge the globules. If desired and preferably I eniploy heated air or a heated gas of any suitable kind entering the same through the passage 3, and if desired a heated coating material may be employed.

I effect through the described process a very fine division of the coating material, the fineness of the division thereof depending upon the velocity of the air or gas entered through the passage 3. The said blast of air or other gas carrying with it the coating material in fine globular form effects a laying of the fibers of the work particularly if the latter be Wood, and also effects a drying of the applied coating. For this reason, I am enabledto dispense with the preliminary sanding of wooden surfaces.

Having thus described my method and the means best known to me for carrying the same into efl'ect, I desire it to be understood ,that, although specific terms are employed, they are used in a generic and .descriptive sense and not for purposes of limitation, the scope of the invention being set forth in the following claims.

The apparatus shown herein but not claimed is the subject of Patent No. 1,172,233, Feb. 15, 1916.

Claims:

1. That method of applying coating which comprises conducting by capillarity a film of the coating material into a position substantially transverse to the path of a film breaking and discharging fluid, and effecting the breaking and discharge of said film by the action of said fluid.

2. That method of applying coating which comprises directing a fluid current and conducting by capillarity a film of the coating material into a position substanto the path of said fluid the film is broken and dischargled upon the work.

3. hat method of applying coating which comprises directing a fluid current and conducting by capillarity a film of the coating material into a position substantiallytransverse to the path of said fluid current, and constantly renewing and maintaining a film by capillarity in such position whereby the film is constantly broken and discharged upon the work.

, 4. That method of applying coating 'w ich comprises directing a fluid current and conducting wholly by capillarity a film of a coating material into a position substantially transverse to the path of said fluid current, whereby the film is broken and discharged upon the work.

5. That method of applying coating which comprises directing a fluid current and conducting by capillarity a film of the coating material into a position substantially transverse to the path of said fluid current, and supplying coating material for the restoration of the film by suction due to c: pillary action. whereby the fihn is constantly hroken and discharged upon the work by said fluid current.

(3. That method of applying coating which comprises directing a fluid current and constantly conducting hy capillarity a film of the coating material into the path of said fluid current and renewing by capillarity a film in such position, whereby said film is constantly hroken and constantly discharged upon the work.

In testimony whereof, I have signed my name to this specification.

HERBERT \V. DAY.

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