US2668594A - Powder spray gun - Google Patents

Description

G. B. MORNIK PQWDER Feb. 9, 1954 SPRAY GUN Filed Jan. 13, 1950 INVENTOR.

mv @64Mo 3X \W lTln/ \\m m.) mm NHV f IN u. l D m 3m a Mw IWW Ihm. Il. uw mw. NNW lill" ||H..|||I OMV uvm HI i l I l Q A 4 W .449 QJTM//K Patented Feb. 9, 1954 UNITED STATES PATENT oEFicE POWDER SPRAY GUN George B; Mornik, Mounds View Township,

Ramsey County, Minn'.

Applcaffmhnuary 13, 1950, serai missers- 16' Claims.v l(Cl. 16g-.33):

This invention relates' toA new and' useful im provem'ents in powder or dustl guns and more particularly to such a gun capable of expelling ordischarging a liberal quantity of powder at each discharge stroke of its operating member; whereby the gun may be utilized for smothering and extinguishing fires, when loaded with a suitable' fire extinguishing powder.

An object. of this invention is to provide4 a powderv gun of such construction that the application of several or more rotary twists tothe operating member will condition the gun for the. expulsion of liberai quantities of powder, regardlessI of' the extent to which the' powder becomes compacted during its' confinement in the' gun.

Another object of' the invention is the pro'- vision of' a powder and air passage chamber beA tween the discharge end wall of the gun and an easily removable inner partition.

Another object of the invention resides in the` use of an air tube which provides a means' of conducting. air from an orifice in the inner partition to a telescopi'ng air chamber created by the reciprocating movement' of the' operating member' over the outer wall of the powder chamber.

Another object of the invention is' the utilization of a valve in conjunction with the air tube',A whereby on the air intake stroke of the operating: member a full' charge of air is drawn through the air tube,I whereas on the discharge stroke the' val've c1osesand an aperture inthe valve body permits. only a portion of the air to ire-enter" the air tube. f

Another object ofthe invention resides in the' provision of a discharge nozzle sealing plug integrally extended' to form a closure for the orice in the inner partition and thereby prevent powder from enteringv the air tube when the gun' is inoperativethe' plug being connected to the operating memberby means of a flexible element, so that on withdrawal" of the operating member; as on the intake stroke, the plug will' automatically be pulled out and expose a continuous* opening for the easy access of airY into the air tube.

Another object of' the invention residesV in the construction ofthe valve which controls' the nowr oi air from` the telescoping air chamber tov the powder chamber; l

A further object ofthe invention is' to provide a device in the. form of a pronged. member at'- tached toa portion of the air tube near the valve 2 any compacted powder pressing against the valve and' permit the valve to operate.

A further object of' the invention resides inthe distribution of a plurality of powder and air passage ducts disposed longitudinally at the irmer wali of the' powder chamber, the ducts being open on each end to permit the passage of powder and: air' froml the' powder chamber to the passage chamber; i

A still further obj-ect of the invention the provision of a plurality of apertures distributec-ii along the wall of' each' of the'powder and air pas# sage ducts, said apertures providing a means of communication between the powder' chamber' andy ducts.

powder and air passagel chamber, and: inner orifice, whereas on the discharge str-okee; powder-l in air' dispersion' is expelled: from the`A discharge nozzle by the' combined actionl` of the powder and air mixture coming' fronr thev plurality of powder and air passageY ducts and' anair stream com-in from' the inner orifice. v

These and other objects of the-invention and the means for their attainment will be more ap"FA y parent fromw the fol-lowing description taken in which controlsthe ow of'air from the telescoping connection with the following drawings;

In the accompanying draw-ings there; has been disclosed a structure design to carry out the viarie ous objects of the invention.

In the* drawings:

Figure 1 a longitudinal sectional view on the line i-l of Figure 3, showing' the' parts in their normal position, as when' the gun is s'eafl'ed;v Figure 2l is ar longitudinal view with thek gun the same position as in Figure 1, but with parts" 'broken away to show the operating' member turnedY one quarter turn to the right and' partially' withdrawn to release the plug closure for the nozzle and' inner orifice,l andlal'so. showing the air tube turned. one quarter'turn. to the right, both aforementioned turns being considered turns to therright when the discharge end` of the gun, known as the forward' end, is hel'd away from the operator and the opposite end?, known as the rear end, is held toward the operator; Figure 3 is a View showing the discharge end' of the gun havi'nga portion of. the cover broken away to 'show the inner partition position retaining `ner partition;

Y powder and air passage ducts at the inner wall of the powder chamber, and the location of four position retaining extensions attached to the in- Figure 5 is a croslsvsectional view on the line 5-5 of Figure 1, showing, the turning arm of the air tube, the openings in the rear end wall of the/ j A powder chamber, and the openings in the body of the flexible valve on the rear end of the air tube.

The powder gun herein disclosed comprises a main cylinder, generally designated by the numeral I, and a removable closure in the form of a front cover 2 for the forward end of the cylin1 der. The front cover 2 provides a convenient means of entry into the gun when the gun is to be recharged. A short discharge nozzle 3 of cir-V cular cross section is centrally disposed in the front cover 2 and consists of a smooth sharply convergent entry portion il followed by a gradually divergent exit Vportion 5, the divergent portion being on the outer, or discharge, side of the cover. By means of this variation in the contour of the nozzle a discharge nozzle is obtained which is more ecient in operation and imparts a greater range to the discharge jet than is obtainable with the customary sharp edged orifices of this general class of powder guns. Both the coverl 2 and nozzle 3 shown in Figures land 2 may be constructed separately of metal, then locked together in their normal position with respect to each other by firmly pressing'V the curved edge 6 of the cover 2 against the outer surface of the nozzle 3 rand outwardly expanding the divergent portion 5 tol its desiredV form. It is also proposed that an alternative construction can be obtained by the formation of the cover 2 and the nozzle 3 into a single unit from a suitable plastic material.

A closure for the rear end of the main cylinder I consists of a back end wall 'I having a cylindrical rim 8 bent at right angles to the main body of the end wall'. The cylindrical rim 8 is fixedly secured to the linner wall of the main cylinder I by the application of a cement or other suitable means of attachment. A

The greater portion of the main cylinder I is reduced as shown at 9 to provide an annular shoulder Ill disposed intermediately offthe cylinder. y

An operating member, generally designated by the numeral II, is mounted for reciprocal movement on the reduced portion 9 of the main cylinder I, and has an end wall I2, as best shown in Figures 1 and 2. The forward motion of the operating member II is limited by the annular shoulder I0.

A narrow passage chamber I3 is formed between the front cover 2 and a suitably spaced inner partition I4 as best shown in Figures l and 2. Four inner partition position retaining vlugs I5 are shown in the figures. The lugs I5 consist of raised portions of the inner partition I4 and abut against the inside face of the front cover 2v when the cover is in its normally closed position. The lugs I5 also provide a means of grasping the inner partition It so that it can be conveniently removed from its position in the gun.

Suitably disposed in the inner partition I4 is an inner orifice I6 of circular cross section. The

orifice IS is comprised of a sharply convergent portion il integrally associated with a tubular portion I8 formed from a short tubular extension I9 of the body of the inner partition I4. The location of the inner orice I6 with respect to the nozzle 3 is such that, in normal operation of the gun, an air jet passing through either oriiice I or nozzle 3 will go through the passage chamber I3 and directly into the other oric'e or nozzle, as the case may be. Any air streamvpassing through the inner orifice It and across the passage chamber i is so reduced in cross sectional areaby the entrance rim of the short tubular extension I@ that the area of the jet passing through the passage chamber I3 will be less than the area of the inner orifice I6. By constricting the jet in this manner the passage of air and powder from other portions of the passage chamber I3 tothe nozzle will be facilitated. The relationship between the nozzle 3, inner orifice it, and passage chamber I3, as well as the construction of each, is best shown in Figures 2 and 3.

An air tube 2t provides a means of conducting air from the inner oriiice it to the telescoping air chamber 2 I. When the operating member I l' is pulled backward a partial vacuum is createdY in the telescoping air chamber 2 i, and as a result of this action air is drawn from the atmospheref into the nozzle 3 from'wher'e it passesconseoutelescoping air chamber 2l. The air tube is rotatably,V supported on the forward lend bya' cylindrical extension 22 of the inner partition I4 and on the rear end by an opening 23 in the back end wall l. A projection 2@ on the air tube 20 provides a stop for fixing the position of the air` tube. rihe portion of the air tube 20 extending into the. telescoping air chamber 2|, as shown at 25, is diametrically recessed at 26 to receive a turning arm 2 which extends laterally beyond each side of the air tube so that it can be engaged by two turning e1ements'28 diametrically opposite'` the operating member II is relatively rotated from the position shown in Figure 1, the turning elements 28 abuttingly engage opposite sides and ends of the turning arm' 2 and cause the air tube 20 to revolve in its supports. By pulling back on the operating member II the turning elements 28 readily become disengaged from the turningv` arm 2 and thus permit the operating member to be manipulated in its normal reciprocating manner.

When the air in the telescoping air chamber 2l is compressed, as on the discharge stroke of the operating member Il, the bulk of the air is made to pass through a plurality of openings 30,

in the back end wall l. The resulting pressure in the openings 3@ causes the soft valve member 3I, normally covering the openings, to be bent away from the end wall 'I and permit the compressed air to enter the powder storage chamber 32. A stiff flexible valve member 33, constructed of paper or other suitable material, normally holds the soft valve memberSI against the openings t@ and prevents powder from entering the telescoping chamber 2l; `Both valve members 3! and 33 consist of circular discs with concentric holes to accommodate the air tube 20 over which they are passed, and` the projection 24 provides a means of holding the valve mem-f bers in position against Athe -end wall 1. A soft valve .member is used `in conjunction with a harder exible material so as to impart resiliency tto the valve combination and to provide more .suitable .space conforming properties to the .portion of the valve in lcontact with the openings 30 rthan would :be obtainable with a hard flexible material Iused alone.

An important .feature of the invention yis provided for bya plurality of powder and air tubes of which four rare utilized Ain the disclosure herein described and which are generally designated by the numeral '34, as lbest shown -in Figures 1 and 4. Each powder andair tube 34 is comprised of a :suitable -U-shaped lmember which forms a continuous narrow duct 35 when the member is xedly Vattached longitudinally to the inner side of the outside -wall of the powder storage chamber -32 by -means of bent vextensions 36 of the sides of the U-shaped member. The -rearvendfof each powder and air tube 34 is in close Vproximity tothe valve members 3I and 33, and the forward end ris connected with a matched opening -31 in the .inner partition I4 `so as to provide a continuous duct from the rear rend of 'the powder chamber 32 to the passage chamber I3.

A plurality of suitably spaced apertures 38 in the wall of leach powder and air passage tube 34 establishameans by which powder and air mixtures may pass from the powder storage -chamber 32 into Aeach of the ducts 35. The relationship Ybetween the size of the ducts 35 and vthe number of powder and air Apassage vtubes 34 must be -such that suicient velocity -is imparted to the powder and air stream within vthe ducts to effectively propel the 4powder and -air mixture within said ducts. When the ygun is held in a horizontal or slightly inclined position one or more 'of the powder and air passage tubes 34 will be at or 4near the bottom of the powder storage wchamber 32, asrcan readily be seen from Figure 4, thereby permitting the lforce of gravity to `act as an additional -means of carrying powder into the lower ducts 35 wherein it is swept to 'the passage chamber I3 by the compressed air in the powder storage chamber. This is an especially .useful .construction for rthose applications in which heavy `free ilowing powders are to be discharged at'a rapid rate.

Should vthe gun be stored in a vertical or inclined position with the `rearward end downward and be subjected to the vibration or jarring which occurs in a moving vehicle, heavy powders will become compacted against the valvemembers 3I and 33 and prevent them from ilexing into the open position when the air in the telescoping air chamber `2| becomes corn'- pressed. A means of loosening the powder near the valve members 3l and 33 is provided for by aprongedmember 39 .xedly attached to a portion of the air tube 20 adjacent to the valve members. When the air tube 'is relatively rotated by manipulating' the operating member VI I in a manner to cause rotation, the powder in and lnear the path of the pronged member 39 willbecome loosened and permit :the valve members 3I .and 33 to operate. The pronged member 39 -is of such length that the powder near the rear entrance to the powder and air passage tubes 34 also becomes loosened thus permitting the-compressed air to enter the powder and air passage :tubes vmore readily.

yAdditional pronged members, generally designated by the numeral 40, of the kind described in my copending application, Serial rNo. 96,191,

filed May 31, 1949, no-w Patent No. 2,576,804, are

xedly attached to the air tube 20 in a staggered manner and serve the purpose of loosening com-.- pacted powder in the powder storage chamber 32.

The unrestricted passage of air through the air tube 20 on the intake stroke of the operating member II and the return of va portion of this air in the reverse direction through the air tube, as on the discharge stroke, is accomplished by use of a exible air tube Valve 4I `held .in position at the rear .end of the air tube by being cemented toa valve retainer 42 which is pressed into the end of the air tube. The valve retainer 42 also serves 'to ysecure the turning arm v2'I `in place as will readily lbe seen :from Figures 1 and 5. On the vair intake stroke the air tube valve 41| liiexes into the open position .by virtue of the suction created in the telescoping air chamber 2I and thus provides an unrestricted opening A`for the passage of air through the air tube 20. On the compression stroke the valve automatically closes to permit only a portion of the compressed air in the telescoping air chamber ZI to re-enter the air tube 20 through a suitable opening 43 in the body of the air tube valve 4I, the bulk of the air being forced into the powder storage chamber 32 bypassing through the 4openings 3D. The portion of the air re-entering the air tube 2!! passes through the passage .chamber AI3 wherein it combines cooperatively with the air and powder streams coming from Ithe ducts 35 and thereby causes a more uniform powder in air dispersion to be ejected from the nozzle 3.

When the gun is inoperative, as when it is being stored, a closure plug `44, of resilient or other suitable material, serves to seal both the nozzle 3 and the inner orice I-B and thus prevent powder from entering the air tube 23, or leaving-thegun. Removal of the plug 44, so as to provide a continuous opening between the air tube 23 and the nozzle 3, is accomplished in a manner similar to that described in my copending application, Serial No. 123,144, iiled `October 24, 1949, now abandoned, in which the plug is attached to the operating member II by .means of a lexibleconnecting element 45; then upon retracting .the operating member at the beginning of the initial air intake stroke the plug is pulled out of its sealing Aposition vand falls into the air tube .20 as best shown in Figure 2. The connecting element 45 Vis fastened to a hook 43 formedonthe end of a nail "il which is first forced through `the ,plug 43 until the head of the nail abuts thefrontend of the plug. YSuflicient slack is provided in the connecting element 45 to permit convenient assembly of the `plug 44 in the nozzle 3 and inner oriiice I6. Assembly is accomplished by passing the plug '44 .completely through the inner orifice I3 while the inner partition I4 is neartheforward end of the gun. The frontend of theplug 44 is then vforced vinto position in nozzle 3 after rst placing the inner partition i4 in its position yin the gun; then the iront cover 2 is pressed into place whileat the Sametime forcing the plug to enter its sealing position in the inner orifice I6. Prior to assemblyof the plug 44 'in the forward end v0f ythe gun, Ithe connecting velement 43 is knotted as shown at 48 and pulled into an enlarged opening 49 in the end vwall I2 'of the operating member I Lafter first consecutively passing-the connectingelernent through suitable openings 53, '31, and .52 `the turning :member 23, the .air .tube valve 4I, .and .the valve :retainer 42 respectively. `A sealingstripLSa Ais permanently cemented over the opening 49 thus securing the end of the connecting element 45 to the end wall I2, the opening e being too small to permit passage of the knot when tension is placed on the connecting element.

When the inner partition lli is placed in position the openings 3'! are kept in registry with the ducts 35 by use of positioning extensions 54 of the body of the inner partition, said extensions tting between adjacent powder and air tube extensions S'S as can readily be seen from Figure 4. It will be apparent from Figure 1 that the rear face of the inner partition Id abuttingly engages the forward ends of the powder and air tubes 3d, and it will also be apparent that the lugs l5 press against the inside face of the front cover 2, thereby the position of the inner partition becomes fixed when the front cover is pressed into position.

The entire gun is inexpensive in construction, and all of its parts readily lend themselves to manufacture in quantity production, whereby the gun may be produced at low cost. It may be made of any desired material suitable for the purpose. Metal, plastic, paper, or more specifically, cardboard has been found very efficient and practical, The paper or cardboard may readily be waterproofed to render it immune from water and moisture, especially in those uses in which the powder might be subject to caking.

The gun herein described has been especially perfected for use as a fire extinguisher, an application which necessitates a gun capable of eX- pelling a large amount of powder in a short time. Also, in such an application, means should be provided for completely sealing the gun against moisture and provisions made for loosening any compacted powder that may form and render the gun efficient in operation.

It is not intended that the use of this invention be limited to re extinguishers, for by making suitable modieations in the size of the powder and air passages and openings, and eliminating the powder loosening components when they may be unnecessary such as may be the case for guns devised for light luiy powders, a suitable simplified form can be obtained which still possesses the essential embodiments of the invention. It will therefore be apparent to those skilled in the art that I have accomplished at least the principal objects of my invention, and it will also be apparent to those skilled in the art that the embodiments herein described may be variously changed and modified without departing from the spirit of the invention, and that the invention is capable of uses and has advantages not herein specifically described; hence, it will be appreciated that the herein disclosed embodiments are illustrative, and that my invention is not limited thereto.

I claim as my invention:

l. A powder spray gun having, in combination, an elongated main tubular member, having end walls, a valved closure for one end wall and a suitably disposed discharge-air intake opening in the other end wall, an inner partition which forms a powder and air passage chamber between the discharge end wall and said inner partition, a powder storage chamber formed between the inner partition and the valved end wall, an air passage opening suitably disposed in the inner partition, an air tube passing through the valved end wall and powder storage chamber, said air tube being connected with the air passage opening in the inner partition, a plurality of powder and air passage ducts suitably formed and disposed at the inner side of the wall of the powder storage chamber and extendingfrom the powder and air passage chamber into a greater portion of the length of the powder storage chamber, said ducts each having a plurality of suitably spaced openings in the wall of the duct, a tubular operating member having one end wall, said operating member being mounted for slideable operation over the main tubular member, whereby a telescoping air chamber is provided between the operating member and the valved end wall of the main tubular member.

2. A powder spray gun having, in combination, an elongated main tubular member, having end walls, a valved closure for one end wall, a suitably disposed discharge-air intake opening in the other end wall, an inner partition which forms a powder and air passage chamber between the discharge end wall and said inner partition, a powder storage chamber formed between the inner partition and valved end wall, an air passage opening suitably disposed in the inner partition, an air tube passing through the valved end wall and powder storage chamber, said air tube being connected with the air passage opening in the inner partition, a selective air control valve for the air tube, said valve being held in place by a suitable valve retainer, a plurality of powder and air passage ducts suitably formed and disposed at the inner side of the wall of the powder storage chamber and extending from the powder and air passage chamber into a greater portion of the length of the powder storage chamber, said ducts each having a plurality of suitably spaced openings in the wall of the duct, a tubular operating member having one end wall, said operating member being mounted for Slidable operation over the main tubular member, whereby a telescoping air chamber is provided between the operating member and the valved end of the main tubular member.

3. A powder spray gun having, in combination, an elongated main tubular member having end walls, a valved closure for one end wall, a suitably formed and disposed discharge-air intake nozzle 1n the other end wall, an inner partition which forms a powder and air passage chamber between the discharge end wall and said inner partition, a powder storage chamber formed between the inner partition and valved end wall a short tubular orifice suitably disposed in the inner partition, said tubular orifice cooperating pneumatically with the discharge-air intake nozzle and being in the direct path of the air stream passing through the discharge-air` intake nozzle an air tube passing through the valved end wall and powder storage chamber, said air tube being connected with the `short tubular orifice in the inner partition, a selective air control valve for the air tube, said valve being held in place by a suitable valve retainer, a plurality of powder and air passage ducts suitably formed and disposed at the inner side of the wall of the powder storage chamber and extending from the powder and alr passage chamber into a greater portion of the length of the powder storage chamber, said ducts each having a plurality of suitably spaced openings in the wall of the duct, a tubular operating member having one end wall, said operating member being mounted for slideable operation over the main tubular member, whereby a telescoping air chamber is provided between the operating member and the valved end wall of the main tubular member.

4. A .powder spray gun having,` in ,combination, Aan elongated maintubular member having trally disposed in the Aother end wall,l a removable .v

inner partition which forms .a powder and air passage chamber between the discharge -endwall and said inner partition, said inner partition having means 'for being held in position, a powder storage chamber formed between the inner partition and the valved end wall, a short tubular orice ycentrally disposed in the inner partition, said tubular orice cooperating pneumatically with the discharge-air intake nozzle, an air-.tube passing through the center of the valved end wall and powder storage chamber, said air tube being connected with the short tubular orifice in the inner partition, av selective air .control valve on the end .of-the'po'rtion of the air tube extending through the valved 'end wall, said valve being held in place by a suitable valve retainer, a plurality of powder and air passage ducts suitably formed and disposed at the inner side of the wall of the powder storage chamber and extending from the powder and air passage chamber into a greater portion of the length oi the powder storage chamber, said ducts each having a plurality of suitably spaced openings in the wall of the duct, a tubular operating member having one end wall, said operating member being mounted for slideable operation over the main tubularmember, whereby a telescoping air chamber is provided between the operating member and the valved end wall of the main tubular member.

5. A powder spray gun according to claim 4, wherein the valve portion of the valved end wall is comprised of a combination consisting of a space conforming member covering the air passage openings in said end wall, and a exible member to provide resiliency to the valve combination.

6. A powder spray gun according to claim 1, wherein a pronged member is xedly attached to a portion of the air tube adjacent the valve members of the valved end wall, and means are provided for relatively rotating the air tube in its supports when the operating member is rotatably twisted, whereby powder compacted against the valve members becomes loosened to permit the valve members to operate.

7. A powder spray gun according to claim 4, wherein the nozzle and tubular orifice are both sealed with a single plug member when the gun is inoperative, the plug being attached by suitable means to the operating member, thereby on initial operation of the gun the plug is automatically withdrawn.

8. A powder spray gun of the class described comprising means providing a powder and air passage chamber, having first and second walls, said first wall having a discharge-intake orice, said second wall having an orice cooperating pneumatically with said discharge-air intake oriiice, means providing a telescoping air chamber a tubular air duct leading from the oriiice in said second wall into said telescoping air chamber, a selective air control valve on the tubular air duct having means therein to permit only a portion of the compressed air to be returned to the inner orifice, an end wall cooperating with said tubular duct having apertures into a powder storage chamber external to said tubular duct, a plurality of powder and air passage ducts situated on the inner side of the wall of said powder storage chamber each having a plurality of aperlfO :tures `through which a powder .and air'mixture may pass into .the powder and air passage chamber whereinthe said mixture combines with the other portion of air .coming through the inner orifice, thereby causing a thoroughly dispersed mixture of powder and air to be ejected. from the discharge-air intake opening. L

9. In a'powder spray gunlof the class described, a powder storage chamber having anend wall with .a valvemeans disposed therein, a tubular member extending lthrough ysaid powder storage chamber, means mounting said tubularY member for rotation relative" to said powder storage chamber, a plurality of powder agitating extensions integral with said tubular member .and projecting'into .said powder .storage chamber, a Atelescopically mounted operating member, A'cooperative associated projections on said operating member and said tubular member whereby initial rotary motion of said operating :member agitates the lpowder in 'the 'powder chamber, :andatf least one of said powder agitating extensions being situated adjacent the valve of the valved end wall.

10. In a powder spray gun of the class described, a powder storage chamber having an end wall provided with a valve, a tubular member extending through said powder storage chamber, means supporting said tubular member for rotation relative to said powder storage chamber, at least one pronged member xedly attached to a portion of said tubular member adjacent the valve of the valved end wall, and means provided for relatively rotating said tubular member when the operating member is twisted whereby powder compacted against the valve becomes loosened to permit the valve to operate.

11. In a powder gun of the class described, a cylinder having suitable end walls, a tubular member extending lengthwise through the cylinder, means mounting said tubular member for relative rotatable movement therein, said tubular member cooperating with the walls of the cylinder to provide an annular powder chamber, a discharge oriee at the forward end of the tubular member, an expansible operating member mounted on said cylinder for rotary and reciprocating movement thereon, said tubular member forming a discharge and intake into said expansible operating member, a valve means in the rearward end of said cylinder, a pronged member xedly attached to said tubular member adjacent said valve member of the cylinder wall and an operative connection between said expansible operating member and said pronged member whereby initially rotary movement of said operating member will loosen any powder which has become compacted against said valve member to allow the valve to operate.

12. A powder gun according to claim 1 wherein means is provided for sealing the discharge airintake opening and the opening in said inner partition, said means being operable to effect the opening of said discharge-air intake opening and said opening in said inner partition when the powder gun is initially operated.

13. The apparatus of claim 1 further characterized by closure member for closing said discharge-air intake opening and said air passage opening in said inner partition, said closure member being movable toward the end wall of the main tubular member having the valve closure therein for opening said discharge-air intake opening and said air passage in said inner partition, a flexible connection within said air tube between the operating member and the closure member; said connection being substantially slack free when the closure member is in a position to close said'discharge opening and the operating member is in a limiting position most adjacent the discharge-air opening and the air passage in the inner partition, whereby when the operating member is moved in a direction away from .the discharge-air opening and the passage in the inner partition, said flexible member will `exert-tension on the closure member to move it `the ends brought easily relatively adjacent one another when said connection is removed from tension.

15. A powder gun according to claim 3 wherein the short tubular orice is of such construction 12 whereupon the discharge stroke of the operating member the discharge air in the air tube is contracted to an air jet of smaller lateral dimensions than the opening in said orifice.

16. The apparatus of claim 15 further characterized in that the short tubular orifice has a length substantiallyV shorter than the diameter thereof.

GEORGE B. MORNIK.

References Cited in the le of this patent UNITED STATES PATENTS

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