US1908848A - Paint spraying apparatus - Google Patents

Description

May my A. F. JENKINS PAINT SPRAYING APPARATUS Filed May 25, 1929 and the Patented May 16, 1933 UNITED STATES PATENT oFFic ALEXANDER F. JENKIS, OF BALTIMORE, MARYLAND i PAINT srRaYiive APPARATUS Application filed May 23, 1929. Serial No. 365,447.

This invention relates to paint spraying apparatus and more .particularly to devices` ing the paint spray valve of such a device which is simple in construction and easy to adjust and operate. I

A further object of this invention is the provision of means for adjusting the paint valve operating means to secure a desired sequence of actuation of the paint valve' and the compressed kair valve, or to effectactuation of the compressed air valve independ-A ently of the paint'valve, the paint valve adjusting means being actuated from a convenient point at the rear end of the device.

Further objects and'features of novelty will be apparent from the following description when read in connection with the accompanying drawing, wherein is illustrated a preferred embodiment of the invention by way of example. Y

Figure 1 is a side elevation of a spray u gun embodying the principles of this 'invention, with part of the body portion thereof shown in section; and

Figure 2 is a section taken on line 2 2 of Fig. 1 in the directioncof the arrows.

In the drawing the body of tliepaint spray gun, or air brush as it is sometimes called, is indicated generally by the numeral 10, and

rear portion 12 connected bya narrow intermediate portion 13 and an arched hanger and trigger pivot member 14. To the lower part 15 of the rear portion 12 is attached in a suitable manner the handle 16 which is provided with a passageway 17 through which compressed air may pass from the connection 18 to the body portion of the device. To connection 18 is adapted to be attached an air-hose of any suitable type leading from a source of compressed comprises the forward portion 11` Within the lower part of the body portion is disposed. an air valve mechanism for controlling the flow of compressed air from the passageway 17, similar in all respects to the corresponding air valve shown in the copending application Serial No. 159,- 849, above referred to. This air valve mechanism is shown in Fig. l1 of the drawing in dotted lines. Valve member-19 isV pressed against seat 20 by means of the spring 21 which is disposed within the bore 22 between the valve member 19 and the re-Q movable closure cap 23 screwed into the end of the bore 22. Valve stem 24 projectsv forwardly fromthe bushing 25 in a position i to be cammed rearwardly to valve opening position by contact with the raised portion 26 of the trigger 27. Trigger 27 is provided with two arms 28 which straddle the body portion 10 and are pivoted at 29 to the member 14.

Beyond the air valve mechanism, a passageway 30 leads to the longitudinal passageway 31 which passes throughv the body portion of the spray gun to a point 32 where it divides and two passageways 33 are pro-V vided, one on each side of the forward por-A tion 11, to convey the compressed air to the annular air space 34 within the nozzle 35. From the chamber 34 the air issues through the annular orifice 36 and through the supplemental jet orifices 37, the paint being forced through the central orifice 3 8 .byl gravity or air pressure acting upon the source of supply or by the siphoning or injector effect ofthe air passing through the orifice 36. Y

lThis nozzle forms part of the subject `mat- K sary to an adequate understanding of the operation of this invention. Y

The constricted end 39 of the valvefstein 40, and the tapered portion 41 cooperate with the inner wall 42 of the orifice memberk 43 to form a needle valve for controlling the C 5 present indelivery of the paint or coating material from thebore 44 of the forward portion 11 of the body member through the orifice 38. This bore 44 communicates with the verti cal passageway 45 which leads to the pipe connection 64. Any usual or suitable means for connecting the supply of paint or other coating liquid to this pipe connection 64 may be provided. n i' Rearwardly of its junction with the passageway 45 the bore 44 is narrowedso as to provide a collar portion 46 which surrounds the valve stem 40 passing therethrough. Between the collar 46 and the plug 47 which is screwed into the rear end of the bore 44 is compressed the packing material 48 forming a customary stuiiing box arrangement, for therpurpose of preventing leakage of coating material from the bore 44.

The rear body portion 12 of the gun is provided with an upper extension 49 which is separated from the forward portion 11by the space 50 lying above the intermediate portion 13. Through this upperk extension 49 passes a bore 51 which is of a larger diameter thanthe bore A44 of the forward portion and is disposed in longitudinal lalignment therewith. extends across the space 50 and through the borel 51 and is provided at its rear end beyond the bore 51 with an adjusting knob 52. The rear end of the bore 51 is closed by a plug 53 through which the stem 40 passes and which cylindrical exterior chamber 54 which encloses the forward end 55 of the knob 52. An abutment 56 is rigidly xed on the portion of the stem 40 which lies within the bore 51. Surrounding the stem 40 within the bore 51 is a spring 57 which is compressed between, the plug 52 andthe abutment 56 so as to constantly urge the needle valve toward its seat.

Threaded upon the stem 40 near its midf dle portion is the adjustable cylindrical plunger or abutment 58 which isadapted to be engaged at its forward end bythe yoke 59 which is pivoted to the trigger 27 at 60. The bore 51 is provided with a lug or key 61 which is fixed thereto and is adapted to engage a slot 62 in the abutment 58 so as to permit sliding movement but prevent rotation thereof.

It will thus be apparent that by turning the knob 52 the plunger or abutment 58 may be advanced within the bore 51 or retracted therein against the action of the spring 57. It will also be seen that the position ofthe abutment 58 upon the needle valve stem relative to the yoke 59 determines the amount of angular movement of the trigger 27 necessary to actuate the needle valve and consequently 'the sequence of actuation of the paint valve and the air valve. It will also be noted that the farther the abutment The needle valve stem 40' is provided with a hollow 58 is adjusted forwardly, the greater the travel of the valve stem 40 upon actuation of the trigger 27, and as a result of the paint valve will be opened wider than it would be upon a lesserv movement of the stem 40. Furthermore, the abutment 58 may be adjusted rearwardly so far that it will not be engagedby the` oke 59 at all,.which will enable the air va ve to be actuated alone for the purpose of forcing air through the nozzle orifices for clearing them of obstructions or for any other purpose.

The compression of the spring 58 may be varied to a slight extent by adjustment of the plug 53 within the rear end of bore 51.

lVhen not in use, the spray gun may be suspended from any suitable support by means of the hook 63 formed at the end of member 14.

Although but one form of the invention has been shown and described, it will be evident that various changes and modifications may be made therein without departing from the scope of the invention as set forth in the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In a spraying device for liquids, in combination, a body having a Vpassageway for a liquid, said body having a longitudinal bore, a valve contro ling the flow through saidp'assageway and provided with a seat, aY stem for said valve extending through said bore, an abutment threaded upon said stem and non-rotatably disposed partly within the forward end of said bore, bore and abutment having interengaging portions preventing relative rotation of the body and abutment, spring means within said bore adapted to urge said valve stem toward said valve seat, and means adapted to cooperate with said abutment to withdraw said Valve from said seat.

2. In'a spraying device for liquids, in

combination, a body having a passageway for a liquid, said body having a longitudinal bore, a valve controlling the iiow through said passageway and provided with a seat, a stem or said valve extending through said bore, an abutment threaded upon said stem and disposed partly within said bore, means for preventing rotation of said abutment within said bore but permitting longitudinal movement thereof, means for rotating said stem whereby longitudinal adjustment of said abutment along said stem is secured, and'means adapted to cooperate with said abutment to actuate said valve.

3. In a spraying device for liquids, in

combination, a body having a passageway` for a liquid, said body having a longitud1- nal bore, a valve controlling the iiow through said passageway and provided with a seat, a stem for said valve extending through said saidl iop bore, an abut-ment threaded upon said stem and disposed partly within said bore, means for preventing rotation of said abutment within said bore but permitting longitudinal movement thereof, means for rotating said stem whereby longitudinal adjustment of said abutment along said stem is secured, spring means within said bore adapted to urge said valve stem toward said valve seat, and means adapted to cooperate with said abutment to withdraw said stem from said seat.

4. In a spraying device for liquids, in combination, a body having a passageway for a liquid, said body having a longitudinal bore, a. valve within said passageway provided with a seat, a stem for said valve eX- tending through said bore, an abutment threaded upon said stem near its middle portion and disposed partly within said bore, a key within said bore, a slot in said abutment for cooperating with said key whereby only longitudinal movement of said abutment within said bore is permitted, means for rotating said stem whereby longitudinal adjustment of said abutment along said stem is effected, and means adapted to co-operate with said abutment to actuate said valve.

5. In a spraying device for liquids, in combination, abody having a passageway for a liquid, the forward portion of said body having a bore. therein, a. rear portion of said body spaced from said forward por tion and having a bore therein aligned with the first mentioned bore, a valve disposed within said forward body portion and having a seat, a stem for said valve extending through both said bores and across the space between them, an abutment threaded upon said stem and disposed partly within the bore of said rear portion of the body and partly within .the space intervening between said forward and rear body portions, means for limiting the movement of said abutment within said bore to a longitudinal direction, means for adjusting said abutment upon said stem, and means cooperating with said abutment to actuate said valve.

6. In a spraying device for liquids, in combination, a body having a passageway for a liquid, a forward portion of said body having a bore therein, a rear portion of said body spaced from said forward portion and having a bore therein aligned with said first mentioned bore, a valve disposed Within said forward body portion and having a seat, a valve stem therefor extending through both of said bores and across the space between them, an abutment carried by said stem and disposed within said rear bore, a closure for the rear end of said rear bore, spring means disposed between said abutment and said closure for urging said stem toward said valve seat, a second abut- 7. In 4a spraying device for liquids, in

combination, a body having a passageway therein for a-liquid and provided with a nozzle, a forward portion of said. body 4having a borel therein, a rear portion of said body spaced from said forward portion` and Ihaving a bore therein aligned with said first mentioned bore, said nozzle and having al seat, a valve stem extending through both vof said bores and across the space between theman abutment carried by said'stem and disposed, within said rear bore, a closure for therear end of saidrearf bore, spring means disposed within said rear bore between said abutment and said closure for urging said stem toward said valve seat, a second abutmentthreaded uponsaid steinL and disposed partly within said rearfbore and projecting into said intervening space, means for preventing rotation ofn said.- second abutment,said stem passing through said closure, nieans dis,- posed upon the end of said stem rearwardly of said closure forrotating said stem whereby adjustment of said second abutment longitudinally of said stem is effected, and a trigger cooperating'with said second abutment for actuating said valve. f

8.,'In a spraying device for liquids, in combination,` a body havingl passageways therein for liquid and compressed air and provided with a spray nozzle at its forward end and a handle at its rear end, a forward portion ofvsaid body having a bore therein, a rear portion of said body spaced from said forwardy portion, and having a boretherein aligned with said first mentioned bore, a valve disposed within said nozzle and having a seat, a valve stem extending through both of said 'bores `and .across the space between them, an abutment carried by said stem and disposed vwithin said `rear bore, a closure for the rear end of said rearbore, springA means vdisposed within said rear bore between said abutment and said closure for urging said stem toward said valve seat, said closure being adjustable to regulate the pressure exerted by said spring, a second abutment threaded upon said stem and disposed partly within said rear bore and projecting into said intervening space, meansl for preventing rotation of said second abutment, said stem passing through said closure, means disposed upon the end of said stem rearwardly of said closure for rotating said stem, whereby adjustment of said second abutment longitudinally of said stem is a v.valve 'disposed within signature.

effected, a valve for controlling said air pasV sageway, a trigger 'adapted to actuatejrsaid air valve and provided with a detachable connection with said second abutment whereby actuation of said liquid and air valves may be eiected either one before the other or the .air valve may be actuated independently of the liquid valve. 'l

. 9. In a liquid spraying device, ink combina- Lion, a body having passageways therein for liquid and air, a valve controlling the iiow through said liquid passageway and having a stem extending longitudinally of said body, an abutment disposed upon said stem iear its middle portion, said abutment being longitudinally adjustable upon said :stem by rotation of said stem, a valve controlling How through said air passageway, a stem for operating said air valve longitudinally disposed beneath said liquid valve stem, a trigger pivoted ata point above lboth of said stems and adapted to `contact with andr actuate said air valve stem, and means associated with said trigger Jfor operatively engaging said abutment to effect actuation of said liquid valve stem, whereby actuation of said liquid and air valves may be effected either one before the other or the air valve may be actuated independently ofthe liquid valve,4

10. In a liquid spraying device, in com? bination, a body having passageways therein for liquid and air, a valve controlling the flow through said liquid passageway and having a stem extending longitudinally of said body, an abutment ldisposed upon said stem near its middle portion, saidabutment being longitudinally adjustable upon'said stem by rotation of the stem, a valve' controlling flow through said air passageway, means for actuating said valve, land means associated with said valve actuating means for operatively engaging said liquid valve and effecting actuation thereof, vsaid last mentioned means being adjustable to permit independent actuation ot the air valve, longitudinal adjustment of said abutment upon said stem effecting variation in the relative times of openingvof said valves.

In testimony whereof I hereunto aiiix my ALEXANDER F. JENKINS.

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