US3504855A - Dispensing apparatus - Google Patents

Description

April 7, 1970 H. w. voLKER 3,504,855

' DISPENSING APPARATUS Filed March 13, 1968 3 Sheets-Sheet 1 INVENTOR 7T* 57m W84 HERBERT w VOLKER April 7, 1970 H. w. voLKER 3,504,855

DISPENSING APPARATUS Filed March 1s, 196e 5 sheets-sheet 2 April 7,` 1970 H. w. voLKl-:R

` DISPENSING APPARATUS Filed March 13, 196s 5 Sheets-Sheet 3 United States Patent 3,504,855 DISPENSING APPARATUS Herbert W. Volker, Naperville, Ill. (8175 Denver St., Ventura, Calif. 93002) Filed Mar. 13, 1968, Ser. No. 712,827 Int. Cl. BtlSb 15/02 U.S. Cl. 239-112 16 Claims ABSTRACT OF THE DISCLOSURE A spray gun adapted for dispensing foam type plastics or other coating materials which is characterized by feed lines for the coating materials which are encased in return lines with valves which are selectively positioned to control the flow of the material so as to provide for continuous return ow to the supply source without passage through the discharge control valves of the gun, thereby enabling the temperature of the material in the infeed line to be maintained constant when use of the gun is interrupted. The discharge control valves and passageways in the gun head are arranged to facilitate cleaning and the control valve assemblies are readily removable as complete units for cleaning and repair. A solvent flush valve is arranged in the infeed passageways to enable the valves and passageways to be iiushed out with solvent While in place and while the coating material is recirculated through the supply lines.

This invention relates to the dispensing of coating materials and is particularly concerned with improvements in a dispenser for spraying, pouring, or frothing coating materials.

Dispensing apparatus has been provided heretofore for applying a variety of coating materials including various plastics which are comprised of relatively rapidly reacting chemical components. Conventional equipment such as the ordinary paint spray gun is not suitable for the application of plastic coatings having chemical components which react rapidly when mixed. While individual components are generally stable, when they are mixed in proper proportions they react quickly to form the completed product and take at least a lirm set r commence to solidify. Consequently provision must be made for mixing the components in the proper proportions and immediately dispensing the mixture. Efforts have been made to modify conventional paint spraying guns for dispensing plastic materials of this type. Generally this has involved providing a mixing chamber within the gun and feeding the ingredients through separate supply lines into the mixing chamber in proper proportions so as to produce the desired coating. The apparatus heretofore developed of this character has not been satisfactory, generally because adequate provision is not made for keeping the apparatus clean so that the control valves and passageways for the ingredients are not clogged and jammed by the plastic components lbecoming set in the same and rendering the apparatus inoperative.

It is a general object of the invention to provide an apparatus for dispensing coating materials, by spraying, pouring or frothing the material wherein there is adequate provision for maintaining the materials being dispensed at the proper temperature and for cleaning the control valves and passageways so that the apparatus may be kept in condition for operation at all times.

It is a more specific object of the invention to provide a dispenser for coating materials, wherein an improved valve arrangement is provided for controlling the ilow of the separate elements through the gun so that the valve structures may be kept free of materials which will clog the same and so that they may be readily washed with a 3,504,855 Patented Apr. 7, 1970 ice solvent, Without dismantling the gun, and thereby kept in operative condition.

It is another object of the invention to provide a dispenser for coating materials such as plastics, or the like, wherein elements to be mixed are fed in separate lines to a mixing chamber and provision is made for recirculation through the supply tank and control of the temperature of one or more of the elements by providing concentric supply conduits and cooperating control valves with the outer conduit serving as a return flow conduit so as to maintain the temperature of the material in the inner Iinfeed conduit while the dispenser is not operating.

It is a further object of the invention to provide a dispenser for coating materials wherein the flow of the material in the supply conduit is controlled by a selector valve which may be adjusted to provide for shunting the incoming material into a return line for recirculation through the supply source while the dispenser is held ready for operation when desired.

Another object of the invention is to provide a dispenser for coating materials having valve structures for controlling the flow of the materials from the supply lines into a mixing chamber, which valve structures are mounted in lbores so that they may be readily removed as complete units for cleaning and repairing.

These and other objects and advantages of the invention will be apparent from a consideration of the spray gun type dispenser which is shown by way of illustration in the accompanying drawings wherein:

FIGURE 1 is a side elevation with portions broken away showing a spray gun which incorporates the principal features of the invention;

FIGURE 2 is a top plan View of the spray gun of FIG- URE 1;

FIGURE 3 is a partial elevation of the front or trigger side of the spray gun of FIGURE 1;

FIGURE 4 is a partial rear elevation showing the side of the spray gun opposite the trigger;

FIGURE 5 is a partial vertical section taken on the line 5-5 of FIGURE 2;

FIGURE 6 is a sectional view taken on the line 6-6 of FIGURE 1;

FIGURE 7 is a sectional view taken on the line 7-7 of FIGURE 1;

FIGURE 8 is a sectional view, to an enlarged scale, taken on the line 8-8 of FIGURE 1;

FIGURE 9 is a sectional view taken on the same plane as FIGURE 8 with the parts in a different position;

FIGURE 10 is a sectional view taken on the line 10-10 of FIGURE 1;

FIGURE 11 is a sectional view taken on the line 11-11 of FIGURE 4, to an enlarged scale;

FIGURE 12 is a sectional view taken on the same plane as FIGURE l1, to an enlarged scale, and with the parts in a different position;

FIGURE 13 is a fragmentary sectional view taken on the same plane as FIGURE 11 with the parts in a still different position; and

FIGURE 14 is a fragmentary sectional view taken on the same plane as FIGURE 1l and with the parts in another position.

Referring to FIGURES 1-5 of the drawings there is illustrated a spray gun type dispenser which is particularly adapted for the dispensing of a coating material, such as a foam plastic, which may be, for example, constituted by an isocyanate resin and a polyol resin with an appropriate solvent and with air pressure employed as a propellant. As illustrated, the gun is designed for a spraying application. With slight adjustment or modification it may be used for pouring or frothing the foam material.

The illustrated spray gun comprises two main body sections or portions constituting a head and a handle or manifold member 11, respectively, the head 10 being secured to the top face 12 of the handle member 11 in a suitable manner and having a nozzle 14 connected by a coupling 15 with a tubular section 16 forming a mixing chamber which is seated in threaded relation in the recess 17 constituting the threaded inner end of a bore 18 extending through the head 10. 'Ihe bore 18 is closed at the rear end by a plug member 19 which has a threaded connection with a threaded section at the rear entrance thereto.

The materials which are to be mixed to form the desired coating are supplied to the gun through infeed supply conduits 20 and 21 which are connected by suitable couplings to threaded bores in the bottom ends of the handle portion 11 for communication with the passageways 22 and 23 extending upwardly to the top face 12 0f the handle portion 11. The inner infeed conduits 20 and 21 have associated outer return conduit members 24 and 25 which have an internal diameter larger than the external diameter of the inner conduits 20 and 21 and which encase or surround the latter. The outer conduits 24 and 25 are connected by suitable couplings to outer sections of enlarged diameter of the bores into which the inner conduits 20 and 21 are coupled so as to be in communication with passageways 26 and 27 which are generally parallel with the passageways 22 and 23, respectively, and extend t0 the top face 12 of the handle portion or section 11. The passageways 22, 26 and 23, 27 are extended into the head 10 for communication with horizontal bores 30` and 31 (FIGURE 8) in the rearward ends of which are mounted ilow selector valves 32 and 33. In one position of the ow selector valves 32 and 33 the passageways 22 and 23 are connected with the passageways 26 and 27, respectively, so that the respective outer conduits 24 and 25 accommodate return flow of the materials to the supply source without passage of the materials beyond the flow selector valves 32 and 33 and with the return flow of the material surrounding the infeed ow line.

Air pressure or other suitable propellant is supplied through conduit 34 and a solvent is supplied through the conduit 35. These conduits are connected by suitable couplings with the lower ends of passageways 36 and 37, respectively, in the handle portion 11 which passageways 36 and 37 extend to the top face 12 of the latter. The air and solvent passageways 36 and 37 are extended into the head portion 10 by passageways 36 and 37 for communication with the bores 30 and 31 and also the cross bore 38 (FIGURE 7) in which a solvent ilush Valve 40 is disposed. Control valve assemblies 42 and 43 are disposed in the forward portions of the bores 30 and 31. These forward portions which house the dispensing control valve assemblies 42 and 43 are of smaller cross section than the rearward portions in which the ow selector valves 32 and 33 are housed and both the dispensing control valve assemblies 42 and 43 and the ilow selector valve assemblies 32 and 33 are removable as units or complete assemblies in an axial direction.

The ow selector valves 32 and 33 (FIGURES 4 and 8-14) are rotatably mounted in the bores 30 and 31 and held therein by an apertured face plate 44 secured in a recess in the rearward face of the body portion 10. The selector valves 32 and 33 are of identical construction and only one will be described in detail, it being understood that the other one has corresponding parts which are identified 'by the same numerals primed. The valve 32 has a barrel-like cylindrical body with a reduced section 45 at the rearward end which is flattened on opposite sides so as to enable it to be grasped by the fingers or a tool for rotation about its axis in the bore 30. The body of the valve 32 is provided with an axially extending slot 46 opening on its peripheral surface, which, in the position shown in FIGURE 11, forms a connection between the passageways 22 and 26, cutting off the infeed of the material in the passageway 22 and forcing return flow of the same through the passageway 26 and thence to the return ilow conduit 24. This prevents the flow of the materials through other portions of the head 10. The valve body has an axial bore 47 extending from its innermost end to a radial bore 48, which, in the position shown in FIGURES 12-14 communicates with the infeed passageway 22 so as to allow the material to pass through the L-shaped passageway thus formed for discharge at the innermost end of the valve body. An axially extending slot 50 is provided in the plane of the L- shaped passageways 47, 48 at the innermost end of the valve body which connects with the return passageway 26, as shown in FIGURE 12, and a1- lows the material to ow into the return passageway 26 when the inner end of the selector valve 32 is not closed by operation of the associated control valve 42. The selector valve body is cut away at the innermost end to provide a relatively narrow tapered outer wall 51 forming a valve seat for cooperating with a tapered inner wall 52 at the inner end of the valve assembly 42 when the valve assembly 42 is moved inwardly in the bore 30. A spring pressed detent 53 is mounted in a vertical bore above the body of the valve 32 which engages in radial pockets formed in the valve body to resiliently hold the valve 32 in adjusted position. The valve body is provided with a sealing ring adjacent the outermost end to prevent leakage.

The control valve assemblies 42 and 43 are of identical construction and only one will be described. Valve assembly 42 comprises a sleeve-like tubular body member 55 which is disposed for axial sliding movement in the forward end portion of the bore 30 with sealing members 56 and 57 to prevent leakage. A valve plunger or piston 58 is disposed in axially slidable relation in the valve body or barrel member 5S. The piston 58 is urged toward the innermost position, Where it closes the axial end passage 60, by a compression spring 61 surrounding an outer end portion 62 which is of reduced diameter and the threaded outer terminus of which extends through an aperture in an end plate 63 and receives a nut 64. The piston 58 has a peripheral groove 65 which, in the position shown in FIGURES 11-13, provides a passageway for material entering the valve sleeve through the inlet opening or port 66 to the outlet opening or port 67. The outlet port 67 connects with the passageway '68 leading to the bore 18 and thence to the mixing chamber 16. The inlet port 66, in the position of the piston 58 which is shown in FIGURES 1l-13, communicates with the passageway 37. The inlet port `66 is closed upon retracting the piston to the position shown in FIGURE 14 and the outlet port 67 is connected with the axial passageway 68 in the inner end of valve sleeve 55 to permit flow of material from the selector valve 32 into the passageway 68 and thence to the mixing chamber 16, the valve sleeve 55 being moved inwardly bringing the surface 52 into engagement with the valve seat forming surface 51 as shown in FIGURES 13 and 14.

The valvel pistons 58 are connected at their forward ends by bracket 70 (FIGURES 8 and 9) and the valve sleeves 55 are connected by the spring plate 63 which has a trigger back-up finger 71 positioned to engage the trigger 72 (FIGURES 5, 8 and 9). The bracket 70 has a center portion 73 offset inwardly toward the head 10 which engages the top end of a toggle bar 74, the latter being pivoted at 75 in a recess 76 in the front side of the head and handle portions 10` and 11, with the lower end positioned for engagement by the end of an adjustably mounted bolt 77 carried on the trigger 72. The trigger 72 has a bifurcated upper end with hook formations 78 (FIGURES 1 and 6) which are adapted to pivotally mount the same on laterally extending aligned pivot pins 80 and a cover plate 81 of inverted U-shaped section is hinged at 82 which may be swung upwardly to enable the trigger to be disconnected from the pivot pins 80 so as to allow the valve assemblies 42 and 43 to be readily removed from the bores 30 and 31 for cleaning and replacement of parts. The trigger 72 has an inner position in which it is desirable to be able to latch the same and a pivotally mounted latch forming bail member 83 is provided for this purpose.

The solvent flush valve 40 which is mounted in the cross bore 38 (FIGURE 7) is spring urged to an inoperative position as shown in FIGURE 7 with a projecting end button 84 which may kbe pressed to axially move the valve core to an operative position where the axially spaced circumferential grooves 85 and 86 connect the solvent passageway 37 through extension 87 (FIGURE 7) with the valve assemblies 42 and 43 for passage of solvent through the valves y42 and 43 and the mixing chamber 16 and nozzle 14 when the valve assemblies 42 and 43 are in position shown in FIGURES ll-l3. A passageway 88 (FIGURIE 5) extends from the ai-r passageway 36 to the bore 18 Where an aligned circumferential groove 90 in the plug 19 and a connecting axial and radial hole 91 in the inner end of the latter provides for passage of air into the mixing chamber 16 and through the nozzle 14.

In using the illustrated form of the device in a typical spray coating operation employing a foam plastic the two resin components which are to be mixed and discharged through the nozzle 14 by an air propellant are fed from a supply tank through the conduits 20 and 21 with the material being heated to the proper temperature required for the desired mixing. The manually operated selector valves 32 and 33 may be adjusted to recirculate the resin components through the supply tanks Without passage of the resin components through the control valves 42 and 43 as shown in FIGURE 11 of the drawings. When it is desired to operate the gun for spraying or dispensing the mixed resins the selector valves 32 and 33 are irst rotated to the position shown in FIGURE l2. With the trigger 72 in the normal inoperative position shown in solid lines in FIGURES l and the valve assemblies 42 and 43 remain in the position shown in FIGURE l2 and the resin components are recirculated through the selector valves 32 and 33 as shown. This is the normal off position of the control valves 42 and 43. In this position of the valves 42 and 43 the solvent line 35, 37, 37' is opened for passage of solvent through the valves and into the mixing chamber 16 to flush out the same.

When the trigger 72 is swung to the fully on position lwhere it may be latched for continuous operation by the bail 83 the valves 42 and 43 are in the position shown in FIGURE 14, with the piston 58 retracted by operation of the toggle 74 (FIGURES 5 and 9) and the valve sleeves 55 closed on the ends of the selector valves 32 and 33 so that the resin materials ow through the selector valves 32 and 33 and through the control valves 42 and 43 to the mixing chamber 16. In this position of the valves 42 and `43 the solvent and air feed lines or passageways 36 and 37 are blocked ott by the pistons 58 and only air line 88 is opened to supply propellant for discharge of the resin mixture through the nozzle 14. The air also aids in mixing the materials in chamber l5.

The trigger 72 has an intermediate position as indicated in phantom lines in FIGURE 5 which places the control valves 42 and 43 in the position shown in -FIG- URE 13 where the piston 58 blocks the passage 68 at the end of the valve sleeve 5S preventing the flow of resin materials into the valves 42 and 43 and opening the air line 36' and the solvent line 37 enabling the passageways through the valves 42 and 43 and to the mixing chamber to be hushed out immediately after the valves 42 and 43 had been opened to allow the resin materials to pass to the mixing chamber. In this position the solvent ilush valve 40 can be operated to flush out the passageways and the mixing chamber.

The valve assemblies 42 and 43 are both held in the bores 30 and 31 by the trigger 72 only. When the trigger 72 has been released from the pivots 80 and removed, the valve assemblies 42 and 43 may be readily withdrawn as complete units from the bores 30 and 31 for cleaning or replacement of parts. The selector valves 32 and 33 are of course adjusted to the position shown in FIG- URE 1l when the control valve units or assemblies 42 and 43 are to be removed so as to prevent passage of the resin components into the bores 30 and 31 and enabling the same to be recirculated through the supply tanks.

While the apparatus has been illustrated and described as a spray gun type dispenser it is not intended that its use be limited to a spraying operation. It may also be used for pouring or frothing operations. For a pouring operation it is necessary to remove the nozzle and replace the same with a plain spout forming piece of pipe (not shown) which may contain a motor driven agitator for the purpose of mixing the plastic components. For the frothing operation a different mixing head is employed having a spiral coil for dispensing the foam material. Also the trigger 72 may be replaced by any other actuating arm, with cam operation, or the like. In addition the handle or manifold 11 may be replaced by a mounting pad shaped manifold so as to facilitate wall or stationary type mounting.

While particular materials and specic details of construction have been referred to in describing the form of the apparatus illustrated it will be understood that other materials and equivalent structural details may be employed within the spirit of the invention.

I claim:

1. A device for mixing and dispensing coating materials which comprises a body having a handle forming portion, means forming a mixing chamber in the body and a discharge nozzle leading therefrom, means forming passageways in the body leading to the mixing chamber, means forming passageways in the handle portion which are in communication with the passageways in the body, infeed supply lines for ingredients to be mixed which are connected to the handle portion in communieating relation with the ends of the passageways in said handle portion, a bore extending normal to said passageways in said body, a flow selector valve adjustably mounted in said bore and an associated flow control valve in said bore, at least one of the supply lines being encased in an outer return line and said flow selector valve being adjustable in said bore and having passageways which in one position of adjustment provide for ow of material from the infeed supply line to the flow control valve and in another position of adjustment provide a connection between the infeed supply line and the associated return line so as to block the flow of material to the ilow control valve and return the material to the supply source for recirculation without passage through the flow control valve.

2. A device for mixing and dispensing coating materials which comprises a body member having a handle forming portion, said body member having a mixing chamber with a discharge opening, infeed lines for supplying ingredients to be mixed, means forming passageways in said body member which lead to said mixing chamber and extend into said handle portion, said infeed lines being connected to said handle portion in communicating relation with said passageways, a portion of said passageways comprising a valve accommodating bore extending through said body member and normal to adjoining portions of said passageways, a dispensing valve in said bore for controlling the How of material to the mixing chamber, an associated ow selector valve in said bore for controlling the iiow of material from one of the infeed supply lines, which infeed supply line has an outer return line which encases the infeed line, and said associated ow selector valve being adjustable in said bore to provide for flow of material from the infeed supply line to the dispensing control valve and, alternately, to provide a connection between the infeed supply line and the associated return line thereby to enable the ow of material from the infeed supply line to be directed either to the dispensing control valve or through the associated return line to the supply source for recirculation without passing through the dispensing control valve.

3. A device for mixing and dispensing coating materials as set forth in claim 2 and said flow selector valve comprising a barrel-shaped valve body rotatable in said bore and having an axially extending passageway which in one position of adjustment of said valve body connects the passageways leading from the infeed supply line and the associated return line so as to the return the material to the supply source.

4. A device for mixing and dispensing coating materials as set forth in claim 2, and said flow selector valve comprising a barrel-shaped body having an axially extending passageway opening at the inner end thereof and connecting with the infeed supply line in one position of adjustment of said valve body so as to direct the flow of material from the supply line to the associated dispensing control valve.

5. A device for mixing and dispensing coating materials as set forth in claim 4, and said associated dispensing control valve having a cylindrical valve body which is slidable in an axial direction in said bore and adjustable to a position to connect with the inner end of said ow control valve so that material from the infeed supply line passes through said ow selector valve and into said dispensing control valve body.

6. A device for mixing and dispensing coating materials as set forth in claim 5, and said dispensing control valve having a piston in said valve body which is movable to a position to block the flow of material into said valve body.

7. A device for mixing and dispensing coating materials as set forth in claim 5, and said dispensing control valve body having inlet and outlet ports which connect with a passageway leading from the solvent infeed line and a passageway leading to the mixing chamber, respectively, and a piston movably mounted in said dispensing valve control body which is adapted to be positioned, selectively, to block the How of material from the solvent line or the flow of material from the flow selector valve.

8. An apparatus for mixing and dispensing a coating material which apparatus comprises a body member having a handle forming portion, means forming a mixing chamber in said body member, said body member having passageways leading from said handle portion to said mixing chamber, infeed conduits connected to certain of the passageways in said handle portion for supplying the ingredients to be mixed, other conduits connected to certain of said passageways for feeding a propellant and a solvent through said passageways to the mixing chamber, portions of said passageways constituting valve receiving bores which extend through said body member normal to adjoining portions of said passageways, ilow selector and dispensing control valve assemblies adapted to be disposed in axially movable relation in the end portions of said bores, an operating trigger mechanism for said dispensing control valve assemblies including an arm member readily detachably mounted on supporting pivots on said body member for movement toward and from said dispensing control valve assemblies and having a valve engaging portion extending over the ends of said bores which traps said dispensing valve assemblies in said bores, and said dispensing valve assemblies each being removable as a unit in an axial direction from the bore in which it is disposed when said trigger arm member is detached from its supporting pivots and moved to clear a path for the removal of said dispensing valve assemblies.

9. An apparatus as set forth in claim 8, and said dispensing valve assemblies each comprising a hollow cylindrical valve body which is slidable in the bore in which the valve assembly is disposed and having inlet and outlet ports adapted to be connected in communicating relation with the infeed conduits and the passageways leading to the mixing chamber, respectively, a

spring pressed piston slidable in said valve body and normally extended to a position to permit the passage of material from the solvent infeed conduit to the mixing chamber, and a trip lever pivotally mounted intermediate its ends adjacent the outer end of said piston with one end thereof positioned to engage a bracket mounted on the outer end of said piston and retract the same to a position to block the ow of material from the solvent infeed conduit when swung about its pivotal mounting by engagement of the opposite end with means on said trigger mechanism which is engageable at the end of the operating stroke of the trigger arm member.

10. An apparatus as set forth in claim 8, and said dispensing valve assemblies each comprising a hollow cylindrical valve body slidable in the bore in which the valve assembly is disposed and having inlet and outlet ports, a spring pressed piston slidably mounted in said valve body, one of said inlet ports normally connecting with a passageway leading from the Solvent infeed line and said valve body and valve piston being normally positioned to permit flow of solvent through the dispensing valve assembly to the mixing chamber, and a solvent flush valve disposed in a portion of the passageway between the connection with the solvent infeed conduit which is operative to permit the ow of solvent through the dispensing control valve and the mixing chamber.

11. An apparatus as set forth in claim 8, and the propellant infeed conduit being connected to a passageway which leads directly to the mixing chamber with a branch passageway leading to each bore in which a dispensing control valve assembly is disposed.

12. An apparatus as set forth in claim 11, and said dispensing control valve assembly having an inlet port connecting with said branch passageway in one position of said ydispensing control valve assembly so as to enable propellant material to be fed to the mixing chamber with the solvent material.

13. An apparatus as set forth in claim 8, and said operating trigger mechanism and said dispensing control valve assemblies co-operating to control the ow to the mixing chamber of ingredients to be mixed and to cut off the ow of the ingredients while permitting the dispensing control valves, passageways and mixing chamber to be flushed out with solvent from the solvent infeed conduit.

14. A device for mixing and dispensing coating materials which comprises a body having a handle forming portion, means forming a mixing chamber in the body with a discharge opening, means forming passageways in the body leading to the mixing chamber, infeed supply lines for ingredients to be mixed which are connected to passageways in the handle portion which are in communicating relation with the passageways in the body, a portion of certain of said passageways comprising a bore and a trigger operated dispensing valve in said bore for controlling the flow of the ingredients to the mixing chamber, and an associated ow selector control member adjustably disposed in said bore, at least one of the infeed supply lines being enclosed within an outer return line and said flow selector control valve being adjustable in said bore to provide in one position for ow of material from the infeed supply line to the associated dispensing valve and in another position to provide for flow of the material to the return line for recirculation without passage through the dispensing valve and the body member.

15. A mixing and dispensing device as set forth in claim 14 and said trigger operated dispensing valve cooperating with said llow selector control member in one position of said valve to block the flow of material from said infeed supply line through said dispensing valve and return the material to the supply source through said outer return line.

16. A mixing and dispensing device as set forth in claim 14 and said trigger operated dispensing valve comprising a hollow cylindrical valve body mounted for axial movement in said bore with an inlet opening in the inner end thereof which is aligned with an end opening in the associated ow selector control member, said flow selector control member being mounted for rotational adjustment in said bore and' having a passage-way which, in one position of adjustment, extends from a connection with an infeed supply line to said opening in the inner end thereof, and the oppositely disposed ends of said dispensing valve body and said ow selector control member being adapted to seat on each other so as to form a connecting passageway for the material from the infeed supply line upon predetermined inward movement of said dispensing valve body.

References Cited UNITED STATES PATENTS 2,942,787 6/19611 Bok et a1 293-124 3,176,922 4/1965 Decker 239-125 5 3,179,341 4/1965 Plos et a1. 239-42-8 3,212,555 10/1965 schuss et ai. 239-125 3,229,911 l/ 1966 Carlson et al. 239-428 3,330,484 7/1967 Johnson ot a1. 239-428 3,348,774 10/1967 Wiggins 239-124 10 3,417,923 12/1968 Carlson 239-428 EVERETT W. KIRBY, Primary Examiner Us. C1. XR. 15 239-125, 336, 428

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