US1887969A - Spray gun - Google Patents

Description

Nov. 15, 1932. R w, TRACY 1,887,969

SPRAY GUN Filed Sept. 18, 1929 Patented Nov. 15, 1932 UNITED STATES PATENT OFFICE I noses-r w. 'rnaozor TOLEDQOHIO, ASSIGNOR roams DE vILBIsscoMrA Yfor, r v TOLEDO, OHIO, A CORPORATION OF OHIO I w I SPRAY GUN Application filed September 18 1929. Serial No. 393,546.

gun is provided with a thumb lever, the actu-' ation of which first opens the air valve and then the valve for controlling the flow of paint or other fluid from the receptacle. If desired, however, the air valve may be omitted and the operation controlled entirely by means of the liquid valve.

. The specific construction ,ofthe invention in its preferred form, and the advantages resultingfrom such construction, will be more particularly explained in connection with the accompanying drawing, in which A- Figure 1 is a side elevation of the spray gun and the receptacle to which it is attached.

Figure 2 is an enlarged vertical longitudinal section of the same.

Figure 3 is a view of. the under side of the cover, with parts-broken away.

Figure 4 is an enlarged sectional view taken on the line 44 of Figure 1.

Figure '5 is a view similar to Figure 2, with the air-valve omitted. 5 The invention, in its present embodiment, is illustrated in connection with a receptacle 7 adapted to contain paint, and provided with a cover 8 which isscrewed on. The cover is provided with anintegral extension 9 constituting a handle. The cover is preferably of cast metal formed on its upper face with an integral enlargement 10 and constitutes a housing for the mechanism which controls the s ray.

The housing 10 is provided at one side with an inlet 11 adapted to be connected to an air compressor or other suitable source of compressed air. Directly opposite the inlet 11 and in alignment therewith is a bore 12 extending through aboss-13and provided with a -safety valve 14 which is retained by a plug 15. Leading rearwardly from the inlet 11 is a bore 16, the rear end of which is closed by a plug 17. The plug 17 is formed with a cen tral passageway 18, which is normally closed by air valve 19 yieldably held to its seat by a coilspring-QO within the. bore 16. The valve 19 has a stem 21 extendinggrearwardly from theplug 17 and adapted to be engaged by'a thumb lever 22, which isfulcrumed on a pin 23. It will thus be seen that a depres sion ifthe thumb lever 22 Opens the air valve 19. -1 The passageway 18 is connected through a port 24 to an opening 25 which leads downwardly through the cover into an annular channel 26 formed in the inner face of the cover and covered by a disk 27. A bore 28 leads upwardly from the channel 26 into the air chamber -29. withi'n the nozzle 30. The nozzle 30 is of the usual adjustable type, held in adjusted position by a lock nut 31. The supply of air to the nozzle maybe adjusted by means of a valve32.f s i The disk 27 is held'against the inner face of the cover by a nipple 34, whichjis screwed into a'bushing 35' set in thehousing 10. A liquid passageway 36 through the. bushing 35 leads to the liquid discharge member 37 within the air nozzle 30. A liquid tube 38 extending from thebottom part of'the re ce'ptacle 7 is secured to the member 34 by means of a suitable union 39. The discharge of the liquid from the member 37 is controlled by means of a needle valve 40.

The rear end of the needle valve 40 extends beyond the housing and is threaded to receive adjustable lock nuts 41 which are engageable by the forked end 42 of the thumb lever 22 when the latter is depressed. A packing gland 43 is provided for the needle valve 40 and hasan integral extension 44 forming a housing for a coil spring 45 which immediately closes the needle valve whenever the latter is released by the lever 22. V r

' A gasket 46 not only forms a seal between. the cover 8 and receptacle 7 but at the same time forms a seal between the periphery-of the disk 27 and the cover.

The disk 27 is preferably formed Witha depressed portion 48 located beneath the channel 26 and having an outlet sleeve 49 secured therein A right angular housing or elbow 50 is secured to the sleeve 49 and secured to this elbow is a laterally extending outlet nipple 51, through which extends the stem 52 of a valve member 53. The outer end of the stem 52 carries a cap 54 seating against the end of the nipple. A

spring 55 tends to open the valve member 53 and permits the compressed air to build up a pressure on the material in the receptacle 7, while the cap protects the end of the nipple and prevents a back fiow from resultsare obtained when both the air flow and the liquid flow are positively controlled by separate valves as shown particularly in Figure 2. The nuts 41 are preferably adjusted so that the liquid needle valve 40 opens just after and closes just before the air valve 19. In some instances however,

especially when a small compressor'and mo- 7 tor are used, it is preferable that the air flow be continuous until the motor is shut oil. In such cases, the air valve 19 is omitted and the plug 17 is replaced by the plug 17 shown in Figure 5.

The construction hereindescribed may be manufactured very economically. Only a small casting is required and, the machine work, p'artic'ularly the drilling for' the air and liquid passageways is comparatively simple. Thea'nnular channel in the inner surface of the cover is very easily made and it facilitates the use of pressure in the receptacle, while the gasket simultaneously seals the channel as well as the receptacle.

Although I haveshown and describedin detail a specific form of the invention, it is tobe understood-that this is merely illustrative-andmay be modified to a considerable extent without departing materially from the scope of the appended claims.

hat I claim is:

1. In a spray gun, a housing provided with a compressed air' passage and a liquid passage terminating in a spray nozzle, a normally closed valve for each passage, means for opening said valves, a nipple for admitting compressed air to the surface of the liquid'to be sprayed, a cap looselycovering the outlet end of the nipple, a head; at the inlet end thereof, a stem connecting" said head-and caps spring acting on said c le having a cover provided with a spray nozzle, means for directing compressed air and liquid to said'nozzle, a nipple constituting'means 'for admitting compressed air to the receptacle, andmeans for adjusting the direction of the discharge end of said nip P 3. In aspraying device, a liquid receptacle having a cover provided with a spray nozzle, means for directing compressedair and liquid to said nozzle, and'means'for dischargingcompressed air into the receptacle including a nipple mounted'o-n anaxis perpendicular to the bottom of the receptacle and having a laterally extending discharge end, said nip'ple being "adjustable about its axis.

4. In a spraying device, a liquid receptacle having-a cover provided'with a spray nozzle, means for directing compressedair and liquid tosaid nozzle, a nipple constituting means for admitting compressed air to the receptacle, means for adjustingthe direction of the discharge end of said nipple, and means tending to prevent b'acliflow through said nipple.

5. In a spraying device, a cover assembly for a receptacle containing liquid to be sprayed, comprising a housing having a base constituting a cover and provided with means for attaching'it to the receptacle, said housing having an air passage and 'a liquid passage terminating in a spray nozzle, said base being formed with a channel in its inner faceconstituting 'a part of said a-ir'pass'age, a member'closingthe faceof said channel, and a liquid tube secured to the: base in line with the liquid passage and at the'same time securing said member to said-base.

6. Ina sprayingdevice, a cover assembly for a receptacle containing liquid to be sprayed, comprising a housing having a base constituting a cover and having a rim provided with means for attaching it to the receptacle, said housing having an' air passageand ali'qu'id passage terminating in a spray nozzle, said base being formed with a channel in its inner face constituting a part of s'aidair passage, a'member countersunk in thein'side face of said base and closing-the face of said channel, said member being of'less diameter than'the inside ofthe rim, and a single gasket constituting a seal bet'weenthe receptacle and said base and, at the same time'c'onstituting a seal between said member and s'aidbase; I i

In testimony whereof I have hereuntosigned my name to this specification.

ROBERT W. TRACY.

ios

iio

Images