US2577465A - Sandblast gun - Google Patents

Description

Dec. 4, 1951 A. JONES ETAL 2,577,465

SAND BLAST GUN Filed Oct. 7, 1949 2 SHEETSSHEET 1 45 v H I j lQl H I I I A /vor Jan 5s Fae/as 6? 19066453 0144420 d/(fassas AUTUZ/YE) Dec. 4, 1951' A. JONES ETAL 2,577,465

SAND BLAST GUN Filed Oct. 7, ,1949 2 SHEETSSHEET 2 ,4 /v0r Jaw/55 27220 A. 2000455 Patented Dec. 4, 1951 UNITED sTATEs PATENT "OFFICE 4 Claims.

This invention relates to a pneumatic spray gun more particularlyof the type designed for abrasive and sand blasting operations, but also adaptable for spraying fluids, if desired.

"The principal object-of the "inventionis to prov i'de a pneumatic gun construction in which "the parts subjected to wear and abrasion can be quickly and easily removed :and replaced without -dismantling theentiregunpand in which replaced parts will immediately function "emciently without further adjustment.

Another object of the invention is to so construct "the gun that the-abrasive container portion o'f the gun-can be quickly and easily removed from the valve and handle'protions thereof.

'A iurther object is to provide a highly efilc'ient sealing means tor sealing an abrasive or fluid container to :the gun.

Otherobjects and advantages "reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer 'tolike parts in al1=views of the drawing and throughout the'description.

In the drawing:

Fig. 1 is aside viewof-the-improved spray gun;

Fig. 2 is a vertical section therethrough;

Fig. 3 is a detail section, taken on "the line 3-4) 'Fig. 4;

Fig.4 is a similar section, taken on 'the'line Fig. 5-is a-detail sectionthru an air valve em- *ployed in the improved gun, taken on the line 5-5, Fig. "2; and

Fig. 6 is a horizontalsectional View, looking upward on the line 65, Fig. 2.

The improved spray gun comprises ahandle casting It provided with a hand grip portion H of the pistol type. A coupling nut 12 is rotatably mounted on the forward extremity of the casing I ll through the medium of a flanged bushing l3. An air feed passage l4 extends into the handle portion 1 I to receive a nipple iii of a suitable air supply hose IB. An air discharge passage I! is formed in the handle portion parallel to the passage l4.

The discharge passage l! is closed at one extremity by means of a threaded plug it. A valve cage i9 is threaded into the handle portion I! so as to extend across the passage H and into communication with the passage 14. The head of the'cage 19 is closed by means of-a tappet valve II which seats against a sealing gasket 20.

The valve 21 is :provided with a stem 22 extending throughoutthe length of the "cage +9 and projecting forwardly therefrom. The cage [9 is provided with :air ports 23 which align with the passage 11 so'that when thevalve'2l is forced away from the head of the "cage i9, it will-allow air to flow from the intake passage 14 'to the *discharge passage 11.

The valve 2| is constantly "urged toward its seated position by means ofasuitable compression-spring24. A-trigger member 25 is positioned in-a itriggerohann'el '26 in the handle portion H. The trigger member 25 is mountedon a hinge pin 21 so that it may -be pulled rearwardly by the fingers of theuser to actuate thevalve-Zl to cause air to discharge from the :bushing 13.

'with 'a third male nipple 3| projecting down- 'wardly at right'angles to the-first'two nipples.

A jet nozzle 32 'is threaded into 'the bushing 13. The :nozzle 32 is provided withastopfiange "33 which is'clamped between the bushing 13 and the "bottom of the nipple -28 to accurately locate the jet nozzle =in'place therein. The jet nozzle .32 extends through a guide opening '34 in the T- fitting 29 and into-an-axial'bore 35 therein.

The bore 35 isdesigned to" receive theextremity of a spray nozzle :tube :36. 'The 'nozzle tube 36 is provided with a locking flange '31 thereon 'which is clamped against the extremity of the nipple '30 by means of a clamp nut 38, threaded entire second male nipple 30, so as to properly position the tube 36 in the T-fitting 29. The

inner extremity of the tube '36 is slotted, as "shown at/39, so that it may extendpast amor iflee nozzle- 40.

The orifice nozzle 40 extends into the extremity of a suction tube 4| and the latter is threaded into the nipple 3| of the T-fitting 29. The orifice nozzle is provided with an accurately positioned seating flange 42 which is clamped against a seat in the bottom of the nipple 3| by means of the tube 4| to accurately position the upper extremity of the nozzle at the best operating position within the spray tube 36.

A container cap 43 is threaded onto the third nipple 3| and is adapted to receive a container 44 for the material to be sprayed. The upper extremity of the container 44 extends within a sleeve 45 projecting downwardly from the cap 43, and is locked in place in the sleeve 45 by means of locking pins 46 carried by the container, which engage in bayonet slots 4! in the sleeve 45.

The top of the container is sealed by means of a sealing plate 48 which is mounted on guide pins 49' in the cap 43, and which is constantly urged downwardly against the top of the container 44 by means of compression springs 50. A sealing gasket 5| is secured to the plate 48 to seal the latter to the upper edge of the container 44. A resilient sealing ring 52 is mounted in the plate so as to snugly enclose the suction tube 4|.

It can be readily seen that air discharging from the jet nozzle 32 over the orifice nozzle 40 will create a partial vacuum in'the suction tube 4| to elevate material to be sprayed or blasted from the container 44.

The sprav nozzles 36 wear away rapidly, when used for abrading or sand blasting purposes. They can be easily replaced by simply loosening the nut 38 and slipping a new one into position without disturbing the remainder of the device. This is also true of the orifice nozzle 40, which can be removed by sim ly unscrewing the suction tube 4| so that a new one may be threaded therein and replaced.

Occasionally, through long or careless use, the material will abrade completely through the tube 36 into the T-fitting 29. In the usual sprayer or blast gun this requires the entire gun to be discarded. In this im roved sprayer, however, it is only necessary to discard the T-fitting 29 and re lace it with a new one.

While a s ecific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

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

1. A construction for abrasive guns and fluid sprayers comprising: a T-fitting; two oppositely projecting and axially aligned threaded nipples formed on said T-fitting; a third threaded nipple proiecting downwardly at right angles to the axis of the first nipples; a container mounted on the third nipple; a spray nozzle mounted on one of the first nipples; a valved air supply member mounted on the other of the first nipples; a suction tube extending downwardly from within the third nipple into said container; and an air jet member clamped between said air supply member and said T-fitting for projecting a jet of air into said spray nozzle.

2. A construction for abrasive guns and fluid sprayers comprising: a T-fitting; two oppositely projecting and axially aligned threaded nipples formed on said T-fitting; a third threaded nipple projecting downwardly at right angles to the axis of the first nipples; a container mounted on the third nipple; a spray nozzle mounted on one of the first nipples; a valved air supply member mounted on the other of the first nipples; a suction tube extending downwardly from within the third nipple into said container; an air jet member clamped between said air supply member and said T-fltting for projecting a jet of air into said spray nozzle; and an orifice nozzle mounted in the extremity of said suction tube and projecting upwardly within said spray nozzle.

3. A construction for abrasive guns and fluid sprayers comprising: a T-fltting; two oppositely projecting and axially aligned threaded nipples formed on said T-fitting; a third threaded nipple projecting downwardly at right angles to the axis of the first nipples; a container mounted on the third nipple; a spray nozzle mounted on one of the first nipples; a valved air supply member mounted on the other of the first nipples; a suction tube extending downwardly from within the third nipple into said container; an air jet member clamped between said air supply member and said T-fitting for projecting a jet of air into said spray nozzle; an orifice nozzle mounted in the extremity of said suction tube and projecting upwardly Within said spray nozzle; a cap member threaded on said third nipple and acting to cover and support said container in said cap member; a sealing plate within said cap member; and means acting between said cap member and said plate to force the latter into sealing contact with said container.

4. Means for mounting a container on an abrasive gun comprising: a threaded nipple projecting downwardly from said gun; a flanged cap member threaded on said nipple, said container extending upwardly within said cap member; pins projecting from said container into bayonet slots in said cap member; a sealing plate resting on said container within said cap member; guide pins supporting said sealing plate from said member; and springs urging said plate downwardly against said container.

ANDY JONES. EDWARD J. KESSELS. FERRIS A. RUGGLES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,040,715 Smith May 12, 1936 2,133,149 Poncelet Oct. 11, 1938 2,200,587 Tirrell May 14, 1940 2,330,690 Lanza Feb. 4, 1941 2,441,441 Paasche May 11, 1948 2,487,366 Penno Nov. 8, 1949 FOREIGN PATENTS Number Country Date 20,634 Great Britain Sept. 8, 1897

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