US1893562A

US1893562A - Air painting system and the like

Info

Publication number: US1893562A
Application number: US383911A
Authority: US
Inventors: Jens A Paasche
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-08-06
Filing date: 1929-08-06
Publication date: 1933-01-10
Anticipated expiration: 1950-01-10

Description

Jan. 10, 1933. J. A. PAASCHE 1,893,562

AIR PAINTING SYSTEM 'AND THE LIKE Filed Aug. 6, 1929 5 Sheets-Sheet 1 E225 54 F r. "6.. 4 5 d 1 4 Jan. 10, 1933. J. A.-PAASCHE 1,893,552

' AIR PAINTING SYSTEM AND THE LIKE Filed Aug. 6, 1929 5 Sheets-Sheet 2 Jan. 10, 1933. J. A. PAASCHE AIR PAINTING SYSTEM AND THE LIKE Filed Aug. 6, 1929 Jan. 10, 193

J. A. PAASCHE AIR PAINTING SYSTEM AND THE LIKE 5 Sheets-Sheet 4 Filed Aug. 6, 1929 WIIIIIIII IIIIIIIAI Jan. 10, 1933. J, PAASCHE 1,893,562

AIR PAINTING SYSTEM AND THE LIKE Filed Aug. 6, 1929 5 Sheets-Sheet 5 Patented Jan. 10, 1933 JENS A. PAASCI-IE, OF WILLIETTE, ILLINOIS AIR PAINTING- SYSTEM AND THE LIKE Application filed August 6, 1929.

This invention has to do with certain improvements in air painting and air coating systems and the like. The invention herein disclosed is so arranged that the air and the liquid to be sprayed are both delivered from the pressure tank to the air gun through a single lineof air and fluid hose, as distinguished from those previous arrangements inwhich two lines of hose have been provided, one of which conducts a solid stream of liquid to'the gun andthe other of which conducts only the atomizing air.

The arrangement herein disclosed includes a pressure tank wherein the liquid to be sprayed is placed. In conjunction with this tank there is provided an air supply connection for delivering air under pressure into the tankso that the liquid is placed under a similar pressure. This arrangement is such that the air may be delivered either into the top of the tank and above the liquid, or into the lower portion of the tank and below the surface of the liquid, in which latter case the air will bubble up through the liquid and thus agitate it in the well understood manner. There is also provided another control head in conjunction with the upper portion of the tank, which control head is provided with valves and connections whereby compressed air from the upper portion of the tank, or liquid from the lower portion of the tank, or a mixture of both, may be admitted into a mixing chamber from which the delivery hose carries the same to the spraying gun. The hand piece and air coating gun is so designed that the atomized fluid and air is easily controlled from a line to a wide spray by a two finger trigger and the multiple spray head is regulated to furnish from a narrow, small. round spray to a fan shaped wide spray as desired.

As a general proposition the apparatus herein disclosed is also used in conjunction with a satisfactory construction of water and oil separator which is placed in the air supply line directly in advance of the position where the airis originally admitted into the pressure tank. In this way the'air is so admitted clean and dry and does not carry any water or oil or other'matter such as rust from Serial No. 383,911.

the air lines; which materials if allowed to come in contact with paints, enamels, varnishes, lacquers and other high grade finishes will injure the same and also tend to clog up the apparatus.

Furthermore, as a general proposition there I is provided an air pressure regulator in the air supply line leading into the pressure tank so as to reduce the air pressure and control the same and admit it into the tank at a pressure of whatever amount is suitable for the particular material being sprayed. For example the apparatus herein disclosed will very satisfactorily place light material by the use of pressure of four to twelve pounds per square inch; whereas heavy materials such as asphalt paints and cement may require as much as one hundred and twenty five pounds per square inch to apply them.

One of the objects of the invention is to [i make it possible to secure complete independence of regulation of the air and material delivered from the tank to the hose which leads to the operating device. This complete independence of regulation of these two functions is nevertheless combined with a structure having a suitable atomizing cham her so that the air and material will necessarily be brought into their proper relationship at the atomizing head and before they enter the hose leading to the operating device.

It is a further object in connection with the foregoing to allow surplus material or paint which enters the mixing chamber to ordinarily return through the air vent opening and back into the body of the tank where it will again mix with the material contained therein.

By the useof this independence of regulation it also is possible to secure the desired relationship between air and material for a very wide range and diversity of operations so that equally satisfactory results may be' secured throughout the various uses to which 9 the unit may be used. Furthermore, the independence of regulation makes it possible to secure satisfactory and thoroughly dependable operating conditions for a wide range and diversity of materials so that the appa- Cit ratus will be equally satisfactory for the lightest to the heaviest material which may be used.

"it is a further object of the invention to provide the regulating valves wit-h compression packings which are so arranged that they will ordinarily take up their own wear by springs and packing glands placed on top of the packing which is held in place by a suitable nut for that purpose so that leakago of air or material may be eliminated.

It is a further object to provide a double strainer arrangement through which the material is strained before is is delivered to the mixing chamber; and this strainer is provided with screening mounted in a vertical position so that skins or chunks of paint drawn against the screens will be allowed to drop to the bottom of the tank automatically by reversing the flow of paint or by simply blowing ai down through the fluid pipe.

I have also disclosed herei a new and improved form of pressure tank container having a quick removable clamp-tight head and also having a greatly improved arrangement for forcing and locking said head into place on the tank body. Since this pressure container has been devised especially to meet the conditions of the present system I have illustrated. and will describe it in detail her in; but it wil be understood that this container may also be used in connection with other air painting ant. spraying systems or as fluid containers.

The container mustbe provided with a quick removable cover whereby the material can be readily introduced into the tank, and which cover also serves to allow the user to reach the interior of the tank for cleaning and other purposes. Usually also the necessary control valves and auxiliary devices of that kind are mounted upon the cover and constitute a unit with it.

In many cases it is desirable to place the liquid material into suitable auxiliary containers such as buckets or the like which are then down into the main tank. The arrangement is provided w h one or more pipes which can reach down into such auxiliary container and when the entire tank is sealed and placed under the desired pressure the liquid material will be forced from such bucket upwardly through the pipe and thence delivered to the spraying: apparatus.

In order to make it possible to use auxiliary buckets or containers of ma imum size within a pressure tank of given size I have so arranged the cover and ank proper that the opening exposed by removal of the cover is of substantially the full diameter of: the tank. When this cover is removed the effect is to establish a. tank opening of practically the full diameter of the tank itself.

Owing to the very large opening which is Cali thus established by removal of the cover t such that a variable amount is not only possible to use relatively large buckets for the material but in some cases two or more such buckets may be simultaneousl setinto the tank, in which case two or more corresponding material pipes would be projected into the individual buckets so that the arrangement could be used for (le livering two or more kinds or qualities of material either simultaneously or in succession.

Owing to the very large size of the cover and the heavy pressure to which it is subjected, the total amount of air pressure on the cover is ertremely high and may amount to many thousands oi": pounds. For this reason it is necessary to provide special means for locking retaining the cover in position on the tank in a perfectly air tight manner. it the same time this sealing and locking means should be of such a form and nature that it can be very readily manipulated by one person and without the use of special tools or equipment. A further object in this connection is to provide an arran 'ement such that the cover can be almost immediately either locked in place or released and without the necessity of manipulating a large nu nber of bolts or equivalent devices.

In this connection it is a further object to provide an arrangement such that when the cover 18 locked in place a sufiicient pressure will be created thereon to give an air tight seal as well as hold the cover in place against the interior tank pressure.

A further object in connection with the foregoing is to provide a gasket arrangement such that when the cover is drawn into place it will "form a perfect seal even though it may be set into place or removed time after time. l his will all ettectively prevent any tendency to force 1e paint or other container material out at the junction point, and. will also effectively eliminate leakage and unsightly conditions such as would otherwise be produced.

Another feature of the invention relates to the provision of a locking device of greatly improved construction for locking the cover in place. This locking; device includes an eccentric pin which when properly rotated forces the cover down due to the eccentricity of the pin. Even with such an arrangement as this a very large force is necessary in order to rotate the pin due to the very large pressure which must be exerted upon the cover.

I have therefore provided a new and improved form of lover arrangement for rotatinp; this pin and thereby securing double acting leverage locking action. This lever arrangement of: novel conscruction and is of leverage will be secured in a na .ural manner as the pin is rotated into the locking position so hat the igseaseai benefit of the leverage exerted will increase at the proper time and as needed.-

A further featureof the invention'is to provide a removable shim plate in conjunction with this eccentric pm; said shim plate being replaceable and removable so that the eccentric plate will come to hearing at the proper time and-in the 'proper manner to 111- sure such an amount of sealing'force as necessary; andalsoto make'it possible to replace-the shim plates from time to time as they wear or as otherparts of the machine protected against damage by setting the buckets into place orremoving them from the tank. In this connection it isafurther object to so arrange the upper portion of the tank structure that the sealing gasket will be effectively protected against any contact with extraneous objects which might tend to damage it and thus interfere with its propersealing action.

A further object in connection with the foregoing is-to give an adequate support for the edge portion of the cover itself so that the seam will not split or give way under pressure.

Another object of the invention is to provide a tank composed of a'seamless shell, preferably drawn from a piece'of sheet steel so that the entire device will be of maximum strength yet light and not subjectto leakage at rivetcdjoints which is objectionable.

A further feature of the'invention relates to the provision of animproved form of wheel mounting. for the tank which may or mav not be used as desired, which wheel moiinting when used makes it possible to manipulate the outfit very much as a wheel barrow so that it can be readily rolled over rough ground or surfaces. tie a further object in this connection to provide an arrang ment which can be supplied either with or withoutsuch wheel-barrow mounting.

Other objects and uses of the present invention will appear from a detailed descrip tion of the same which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings:

Figure 1 shows a vertical section through the pressure tank and valve mechanism on'the head thereof, and also shows the single hose line connected to the atomiz ngi chamber and shows a suitable air gun partially in cross section;

Fig. 2 shows a plan view looking. down upon the top of the tank of Fig. 1;

Fig. 8 shows a fragmentary cross section throughthe inlet valve being taken. on the lii1 e-83of Fig. 1 lookingiinthe direction.

ofJthe arrows;

Fig. 4 shows a cross section through the atomizing chamber and control valves; being. taken on the line H of Fig. thedirection of the arrows;

Fig. 5 showsa vertical section through a tank outfit embodying'the features of the present invention;

Fig. 6' shows a side elevation substantially at rightangles to Fig. 5;

Fig. 7 shows an enlarged fragmentary detailed view of the upper edge tank and the lower companion edge. portion of-the Coven-and shows how the-gasketiiseffectively protected against damage and at the same time the lower edge of the cover is sup.- ported and protected against splitting;

Fig. 8 shows a plan view of the outfit shown in Figs. 5 and 6;

F ig.-9 shows a fragmentary sidev view of the upper portion of the outfit looking inthe opposite direction from Fig. 5 and shows pars ticularly the lever arrangement whereby the eccentrlc pin is readily rotated; and

Fig. 10' shows a fragmentary c oss section on the line 101O of Fig. 9 looking in the direction of the ar 'ows.

In the present application I have shown the features of my invention as being applied to a particular form of pressure tank which is admirably adapted for this class of service, and which is illustrated in Figs. 5 to 10 inclusive.

lVith the above in mind, the pressure tank illustrated includes a shell 6, of generally cylindrical form; wh'ch shell has a curved bot tom 7. Preferably also a base flange 8 is provided around the lower portion of the shell'to establish a suitable support therefor so that the tank and other plane surfaces.

Around the upper portion of the shell there is placed a ring 9 which serves as a reinforcing ring and also establishes a convenient element to which the cover 10 is connected. This ring 9 whenused is provided with a circular groove 11 in its upper face said groove receiving the lower edge 12 of the cover 10, which cover is dfsh'shaped as illustrated in Figs. 1 and 5. Preferably also a gasket 13 of lead or other suitable material is set down into the groove 11 before the cover is set in place to thereby establish an air tight connection.

Any suitable means may be used for locking.

the cover to the tank; as for example an eccentric pin 14 together with suitable connecting'and operating devices all of which are illustrated in detail in Figs. 5 to 10 hereof.

Preferably also the cover 10 has its top surface reinforced and stren thened by a plate 15 which is brazed or otherwise connected thereto.

An inlet Valve 16 is placed above'the cover 1 looking in portion of. the

will stand upright on floors.-

3 out from the ably a light spring and at one side of the device. This valve is preferably of the plug type including the tapered plug 17 working in the body member 18 the plug being provided with an operating handle 19 in the usual manner. The plug is drawn down to a firm seat bymeans of a spring 20 around its lower end, said spring being placed between a washer 21 which bears against the bottom face of the body member 18, and a nut 22 on the lower end of the plug itself. This nut preferably has its top surface recessed to receive the lower end of the spring.

The body 18 is provided with an air inlet connection 23 which receives a nipple 24:. This nipple has at its inner end a small chamber 25 within which there is located a check valve 26 controlling the inlet passage 27 of the nipple. This check valve permits the incoming air to flow toward the valve plug but prevents any backward movement. The end 28 of the nipple is threaded to receive the connection 29 on the end of the air supply hose 30; and said air supply hose may receive the compressed air from any suitable source. Ordinarily, this air will be passed through suitable water and oil separator and a cleaner; and in such case such cleaning device may be connected directly to the nipple 2e.

Leading sidewise fromrthe body 18 from its opposite sides are the connectors 3l one 32. The connector 31 makes a r'ght angle bend and reaches down to a nipple 33 which is threaded through the cover 10 and reinforc ing plate 15. Preferably also a block 34 is threaded up into the lower end of the nipple 33 and is provided with check valve 35 which prevents any back movement of material or air from the tank towards the plug valve 17.

The connector 32 already referred to is provided with a union nut 36 by means of which it may be connected to the nipple reaching body member 18. This connector 32 makes a right angle bend and connectsbv a union nut 38 with ripple which is threaded down through the cover 10 and reinforcing plate 15. A small check valve 4:0 is preferably placed in the nipple 39 so as to prevent any back movement of material from the interior of the tank to the plug valve The check valve 40 is normally held seated by a light spring ll and there also preferto hold the check valve 35 in seated condition.

The valve plug 1'? is provided with a right angular passage having the arms and 13 at about its middle portion. When said plug 15 turned to the position indicated in Fig. 2 (being the same as the position in these arms establish communication of air from the supply nipple 24: to the connector 32; when the valve is turned a quarter in the counter clockwise direction (when looking at Fi 2) the air supply nipple 24 is connected to the connector 31. At other positions the device is shut off from the air supply nipple 24L The connector 32 is intended to deliver air down to the lower portion of. the tank through a tubular extension d4: which connects to the lower end of the nipple 39 by means of a union nut l5. The lower end of the tubular extension l is preferably cut oil at an angle as shown at 46 in Fig. 1, so that the same will never be closed by contacts with the bottom of the tank.

when air is introduced through the connection 31 it simply exerts a pressure on the top of the material in the tank and also insures a constant delivery of air into the upper portion of the tank and above the liquid contained therein. On the other hand when the valve plug is turned to the proper position to supply air to the connection 32, said air iiows down through the pipe 44 which reaches below the surface of the material in the tank, that said material is thereby agitated by the air bub ling up through the material. At

the same time a supply of air is maintained into the upper portion of the tank.

It will be noted that when the valve plug handle 19 is turned to either of the off positions the air already in the tank is retained therein under pressure due to the presence of .ilQ check valves 35 and 40. I have provided a rake passage 47 which reaches down. through the central portion of the plug 17 and has a right angular extension l8 located in plane below the openings to the

connectors

31 and 32. The body 18 has a side passage 49 which communicates with the connector 31 so that when the valve plug is turned into one of the off positions the connector 31 will be vented, although this will not allow escape of the air from the tank itself.

At another point on the cover 10, and preferably at the opposite side thereof there is placed a control head 50. The same includes a body member 51 which is threaded down through the covering 10 and through the reinforcing plate 15. In the central portion of the body 51 there is a mixing chamber 53 the upper end of which is closed by a plate 5411M in place in any convenient manner by means of screws 55.

A delivery connection 56 extends out from one side of the body member 51 and receives the mixture from the chamber 53.

This connector 56 preferably constitutes one end of a shut-off valve 56 which delivers he mixture of and material through the hose 5'? to the air gun 58.

In the floor of the body member 51 there are two ports 59 and 60 respectively. The port 59 connects with a passage 61 which extends through the body member and receives compressed air directly from the upper end of the tank. The port 60 communicates with the passage 62, which in turn communicates with a tube 63 which extends direct to a position close to the bottom of the tank and receives the material therefrom. Breferably a strainer 64 is placed on the lower end of the material tube 63, said strainer being of cylindrical form and having the two side screens 65 on opposite sides (only one of said screens being shown in Figs. 1 and 5). The screens 65 stand in vertical position so that the material enters in a horizontal flow direction, and due to the vertical nature of the screens any material which is caught by them will be allowed to drop down from them into the bottom of the tank. This action may be facilitated if necessary by blowing air down through the tube 63 and out through the screens into the tank, or reversing flow of paint.

In the cover 54 already referred to there is a pair of needle or pin valves 66 and 67 corresponding to the ports 59 and 60 respectively. These pin valves work through

nipples

68 and 69 which are threaded through the cover 54-. The upper ends of the pin valves are-provided with handle extensions 70 and 7.1 and said upper ends are also threaded through the

caps

72 and 73, which in turn are threaded onto the upper ends of the

nipples

68 and 69. By turning the

handles

70 and 71 the pin valves are raised or lowered from their respective seats. and in this way the delivery of air or liquid intothe mixing chamber 53 is controlled.

Preferablyythe nipples 68 and 69 are also provided with sockets 7 4 and 75. and suitable packing material 76 is placed in the lower portion of each of these sockets and around the pin valve. Furthermore a spring 77 is placed in the upper portion of each of said sockets and works against the packing therein through the medium of the washer 78. In this way each of the packings is kept under spring tension at all times so that wear is automatically compensated for.

Theoperation of this device is as follows: Upon turning the valve plug 17 to the proper position where pressure will be admitted from the supply hose into the upper portion of the tank and will thus establish a supply of compressed air in the upper portion of the tank, and will also exert a pressure on the top surface of the material therein. Upon opening the air pin valve 66 by turning its handle 70 a supply of air will be delivered out through the hose to the gun (assuming that the valve 56 has been opened). Upon opening the material pin valve 67 by turning its handle 71a supply of material will squirt up into the atomizing chamber 53 and will mix with the air therein. This material will therefore also be delivered through the hose to the gun. It will be evident that by adj usting the relative positions of the two pin valves the proportions of air and material may be adjusted within wide limits and accordingto the nature of the material being handled, the volume of spray which is being used and other factors of operation. Owing also to the independence of control of the air and material valves it is possible to effect almost instantaneous readjustments of the operating factors so that the mixture delivered through the hose to the gun is at all times under perfect control. Either valve may be shut off to admit air or fluid only as may be required for cleaning, washing or air drying operations.

Any suitable form of shown at 58 in Fig. 1. It includes a body member 79 having a downwardly extending angular extension 80 which receives the upper end of the hose 57 by means of a union gun may be used, as

coupling 81. The body member 79 and extension '80 are provided with a relatively large passage 82 which turns in an axial direction anddelivers the niixture'through a nozzle 88 preferably provided with a slotted opening 8 There is a longitudinal extending pin or needle valve 85, the front end of which co-operates with a. suitable seat in the multiplehead of the gun or in the tip thereof so as to control the volume of mixture which will be discharged. A suitable trigger 86 is operatively connected to the pin 85 so that sa d trigger can be conveniently manipulated by the finger of the operators hand grasping the handle 87.

It will be understood that the momentary control of the spraying operation is per formed by manipulation of the trigger 86 and that'when the air and material valves 66 and 67 have once been adjusted for a given kmd of material and other similar conditions, it is unnecessary to readjust these valves as the trigger 86 is momentarily actuated back and forth. I

If desired, any suitable form of safety valve device 88 may be provided in the cover for relieving excessive pressure; and if desired a suitable form of vent valve 89 may also be provided in the cover for relieving the air pressure before the cover is removed from thetank.

Considering the tank itself more in detail it comprises a drawn shell 6 the bottom 7 of which is preferably rounded so as to more eifectively resist the internal pressure and also for the purpose of facilitating manufacturing operations.

Around the lower portion of this shell is placed a belt or collar 8 of suiiicient depth to establish a plane support for the shell. The upper edge of this belt 8 is soldered or otherwise securedto the lower portion of the shell as shown at 90 in Fig. 5.

Around the upper edge of the shell 6 there is placed the reinforcing ring 9. This ring quarter circle; and the diametrically opposite preferably has its inside surface 91 tapered or slanted; and the ring is provided with the shoulder 92 which rests against the upper edge of the shell 6. This ring 9 may be soldered or welded in place or secured in any other suitable manner but it should be an air tight joint established between the parts.

The upper edge of the ring 9 is provided with the groove or recess 11 which is established between the inner flange 93 and the outer flange 94 as best shown in Fig. 7. The inner flange 93 is carried up to a higher elevation than the outer flange 94, and both flanges are high enough to establish an adequate pocket for the lead gasket 13. This gasket 13 is preferably of quarter crescent shape as shown in Fig. 7 so as to more effectively receive and seal against the lower edge of the cover presently to be described.

The cover has its edge portion flanged downwardly and of proper size to seat into the groove 11 already referred to and against the gasket therein. At the same time the lower edge of the cover is effectively protected by the flange 94 of ring 9 so that any tendency for the cover to split and expand outwardly is resisted.

The central portion of the cover is fiattened to receive the reinforcing plate which may be welded or soldered to the cover and may constitute an integral portion thereof. Examination of Fig. 5 in particular shows that the downwardly flared edge portion of the cover is curved substantially on a reinforcing plate 15 preferably occupies the entire flat portion of the cover and up to the point where this curvature begins. In this way the downward thrust upon the cover will be communicated to the flanged portion of the cover without any serious danger of deflecting the cover itself from its true shape.

There is a pair of

brackets

95 and 96 secured to the upper portion of the shell 6, at points. Each of these brackets projects to an elevation above the position of the cover and the

rings

97 and 98 are set through suitable openings in the upper portions of these

brackets

95 and 96. These

rings

97 and 98 are provided with perforations to receive the end portions of the locking pin 14. Said locking pin has a central circular body portion 99 which, as best shown in Fig. 5, is concentric with the

rings

97 and 98. The

end portions

100 and 101 of this locking pin 14 are circular and eccentrically formed as clearly shown in Figs. 5 and 6 so that as the locking pin is rotated its central portion must move downwardly with respect to the

brackets

95 and 96 and thus effectively lock the cover in place.

A removable shim plate 102 is set down onto the cover reinforcing plate 15, said shim plate occupying substantially the entire width of the reinforcing plate. This shim plate is provided with a pair of dowel pins 103 and 104 which project down into suitable recesses in the reinforcing plate 15 and thus hold the shim plate in place.

The shim plate can be lifted away from the 7 receive the dowel pins 103 and 104 already' referred to. In this Way the exact elevation of the top face of the shim plate 102 may be readily adjusted from time to time so as to compensate for wear either of the plate or of the gasket 13 or other parts.

The act of rotating the locking pin 14 serves to clamp the cover in position. Experience has shown that a very large turning effort 1s necessary in order to effectively clamp such a large cover as is used in devices of this kind. In order to be able to exert a sutficlent leverage on the locking pin 14 I have provided the lever arrangement which I Wlll now explain in detail.

One end of the locking pin 14 is provided wlth an enlargement 106 which has a transverse perforation to receive the pin 107. This pm 107 has its end 108 substantially straight and working through the perforation of the portion 106; whereas the other end 109 of the pin 107 is curved as shown in Fig. 9.

A pin 110 projects outwardly from the bracket 95 and a block 111 is pivotally mounted upon said pin 110. The block 111 has transverse opening to receive the operating bar 112 and said operating bar is of sufficient diameter and the holes in the block 111 are so pos tioned that they intersect each other. The pm 110 is then provided with a curved groove 113 which receives the rod 112 so that when the parts are properly assembled the presence of the rod 112 prevents the block 111 from slipping off of the pin 110. Nevertheless by completely withdrawing the rod 112 from the block 111 the parts are so disengaged tiat the block 111 can be slipped off from the pin 110. This arrangement is evident from examination of Fig. 10.

The end portion of the rod 112 carries a block 114 within the same there being a roller 115 journaled. Said roller is grooved to receive the curved portion 109 of the rod 107.

When the parts are suitably engaged as shown in Fig. 9 it is evident that downward movement of the left hand portion of the rod 112 will result in raising the roller 115 which, by pressing against the curved portion 109 of the rod 107 will cause the locking pin to be rotated. It will be seen that the effective leverage of the arrangement will change as the locking pin 14 rotates; and furthermore the operator may also change the effective leverage from time to time by simply adjusting the rod 112 back and forth in the block 111 and simultaneously bringing the roller 115 to bear against the curved portion 109 at the proper point.

It will be found that by this arrangement it is possible to exert a tremendous locking force upon the pin 14, and the operator is able to adjustthe effective leverage from time to time according to the momentary requirements. Furthermore, by drilling the hole through the block 106 of the locking pin 1st in the proper direction it is possible to so arranged the pin that during certain manipulations of the rod 112 the locking pin will be turned over just far enough to lock the cover in place, whereas continued movement will serve to again unlock the cover.

It will also be noted that the presence of the groove in the roller 115 will effectively retain the roller in contact with the curved portion 109 of the rod 107 and also prevent the rod 10? from turning around in the hole of the block 106.

A curved bracket 116 is set against the ring 8 at one side of the device and preferably extending across the unit in the same direction as the locking pin. This bracket 116 has the arms 11? and 118 which support the cross pin 119; and the

wheels

120 and 121 are journaled on the ends of the axle pin 119.

The handle rod 22 has its lower end con nected to the bracket 116 and the upper end of said handle rod 122 is provided with a cross piece 12 which establishes the hand grips.

In some cases it may be desirable to reinforce the arrangement by passing a rod or belt 124 entirely around the tank and connecting the ends thereof to the handle bar 122 by passing said enos through the handle bar and fastening them by nuts 125. In such case the ends of the rod 124 should be overlapped as shown in Figs. 5 and 8.

In some cases also it may be desirable to support an auxiliary device such as an air separator or cleaner 126 on the tank proper. This may be readily done by means of a suitable supporting belt 127 placed around the tank.

lVhile l have herein shown and described only a single embodiment of the features of my present invention still I do not intend to limit myself thereto except as I may do so in the claims.

I claim:

1. A spraying outfit for the purpose specified comprising in combination a tank having a removable cover, said tank being for the accommodation of liquid material to be sprayed, an inlet air valve fitting in cQn unction with said cover, a connection for the delivery of compressed air to said fitting, acon motion from said fitting throiwh the cover for the delivery of compressed air into the upper portion of the tank, another connection from said fitting through the cover for the delivery of compressed air into the lower portion of the tank for agitating purposes, a valve in said fitting, for the control of air delivery into either the upper or lower portions of the tank as selected, another fitting in the tank cover including an atomizing chamber, a passage from the upper portion of the tank into said atomizing chamber for the delivery of compressed air and vapor into said atomizing chamber, another passage from the lower portion of the tank for the delivery of li uid into said chamber, independent needle vaves for controlling both of said passages, a delivery connection reaching from said atomizing chamber, and a spray hose in conjunction with said connection, substantially as described.

2. A spraying outfit for the purpose specified comprising in combination a tank having a cover, a fixture on said cover, a connection for delivery of compressed air to said fixture, connections from said fixture leading into the upper and lower portions of the tank, Valve means in said fixture for controlling delivery of compressed air into either the upper or the lower portion of the tank as selected, means for preventing a back flow of liquid from either of said connections to said fixture, another fixture in conjunction with the cover, there being an atomizing chamber in said fixture, independent passages leading from the upper and lower portions of the tank into said atomizing chamber for the delivery of compressed air and vapor, and liquid, into said a-tomizing chamber, independent valves for the control of both of said passages, a spray gun, and a hose leading from the atomizing chamber to said spray gun, substantially as described.

3. A spraying outfit for the purpose specified comprising in combination, a tank, a fixture in conjunction with the upper portion thereof, connections from said fixture into the upper and lower portions of the interior of the tank, means for supplying compressed air to said fixture, valve means in said fixture for delivering said compressed air into either the upper or lower portion of the tank as selected, another fixture in conjunction with the tank, there being an atomizing chamber in said fixture, passages leading from the upper and lower portion of the interior of the tank to said atomizing chamber, independent valves for both of said passages, a spray gun, and a hose connection from the mixing chamber to the spraying gun substantially as described.

JENS A. PAASCHE.