US2732258A

US2732258A - Multi-chamber spray gun

Info

Publication number: US2732258A
Authority: US
Publication date: 1956-01-24
Anticipated expiration: 1973-01-24

Description

Jan. 24. 1956 E. J. FISHER 2,732,258

MULTI-CHAMBER SPRAY GUN Filed April 10, 1953 5 Sheets-Sheet l Jan. 24, 1956 E. J. FISHER 2,732,258

MULTI-CHAMBER SPRAY GUN Filed April 10, 1953 5 Sheets-Sheet 2 IN VEN TOR.

[may JfZifaz/i BY Jan. 24. 1956 E. J. FISHER 2,732,258

MULTI-CHAMBER SPRAY GUN Filed April 10, 1953 5 Sheets-Sheet 3 AZZ INVENTOR.

E/726g J. 129/266 Jan. 24, 1956 E. .1. FISHER 2,732,258

MULTI-CHAMBER SPRAY GUN Filed April 10, 1953 5 Sheets-Sheet 4 IN V EN TOR.

[may J Fake 7 Jan. 24, 1956 5. J. Fl SHER 2,732,258

MULTI-CHAMBER SPRAY GUN Filed April 10, 1953 5 Sheets-Sheet 5 I f 2 4 f rim 2 IN VEN TOR.

United States Patent MULTI-CHAMBER SPRAY GUN Emery J. Fisher, Chicago, Ill.

Application April 10, 1953, Serial No. 348,008

5 Claims. (Cl. 299-140) My present invention relates to multi-charnber guns for spraying a plurality of materials from a plurality of sets of nozzles and, more particularly, it relates to such guns for spraying a plurality of materials onto a central blast of comminuted, granular, cellular or fibrous materials discharged through a central pipe. This application is a continuation-in-part of my copending application Serial No. 225,495 filed May 10, 1951 now Patent No. 2,683,625.

The type of spray gun to which this invention pertains is particularly useful for spraying granular, cellular, fibrous or comminuted insulation materials onto walls, roofs, floors and other surfaces to provide thermal and/or acoustical insulation thereon. In order for such insulation materials to adhere to a wall or othersurface and form a continuous, bonded-on coating or blanket, it is necessary to at least partially coat the individual particles or pieces with a suitable adhesive binder. This general method or technique of applying and building up such mats or coatings of insulation on surfaces is disclosed in Patents Nos. 1,718,507, 1,888,841, 2,179,679 to Wenzel et al., 1,837,422 to Fix and 1,978,125 to Bennett.

Briefly, such continuous, bonded-on insulation is applied by blowing particles of insulation of the proper type and character through a flexible conduit or hose of relatively large diameter havingon the end thereof a spray gun which has a central blast pipe which telescopes with the end of the flexible conduit and which carries an annular spray head carrying a plurality of discharge nozzles through which jets of liquid adhesive are sprayed so as to impinge upon the blast of insulation particles issuing from the central pipe thereby giving these particles a coating of the adhesive which serves to cohere the particles together as well as to the wall, ceiling orother surface which is being insulated. The spray guns which have heretofore been used for applying this type of continuous, bonded-on insulation are disclosed in Lampe Patent No. 2,433,463 and Fisher Patent No. 2,578,412. An improved spray gun for use in applying such insulation is disclosed in my aforementioned copending application Serial No. 225,495. However, in all of these spray guns there has been only a single set of liquid spray nozzles and these nozzles were used for spraying the adhesive binder material.

In addition to 'the adhesive binder material, there are requirements for other types of material. For example, it is often desirable to incorporate a fireproofing material as the insulation blanket or mat is being built up. Attempts to incorporate various fireproofing materials along with the adhesive materials by means of admixture therewith have not been successful. To date, the various fireproofing materials that have been proposed have proven to be incompatiblein admixture with the various adhesives, such as emulsified asphalt.

There are requirements for other types of liquids to be sprayed onto the insulation material in addition to adhesives and fireproofing or fire-retarding agents. For

example, anti-freeze agents, preservative agents, primers,

sealers, protective coatings, foam producers, decorative 7 2,732,258 Masa 24,

coatings, protective coatings, etc., all have a potential place in the application of sprayed-on insulation. Thus, the insulating project might be to provide the interior of an industrial building constructed of corrugated steel with a continuous bonded-on mat or blanket of combined thermal and acoustical irisulationp The best insulating job might be obtained by first coating the bare metal surface with an adhesive primer following which a layer of thermal insulation is applied over the primer coat by spraying comminuted cellulosic material coated with an adhesivebinder. After a layerof thermal insulation had been built up to the proper thickness, e. g. A it may be desirable to seal the surface with a sealer coat and then build up thereon a layer of acoustical insulation formed, for example, of comminuted asbestos, the particles of which might be coated with a different type of adhesive binder and'also a fireproofing agent. After the acoustical insulation layer had been built up to thickness, e. g. /2"%",'it might be desired to give it a coating of aluminum paint or some other protective coating. It will be seen that the application of such a type'of insulation would involve the spraying of four difierent types of liquids.

With the present type of spray guns that are available, it is practical to make such installations only in a limited number of-special cases. Thus, it is difiicult and awkward with the present type of spray guns capable of spraying only one liquid to change over from spraying one type of liquid to another. Inthis connection it should be observed that the operator of the spray gun will usually be working from a scaffold and will be handling a spray gun on the end of the flexible conduit to which is also connected-a compressed air line and another hose line carryingthe liquid adhesive binder. The equipment for blowing the comminuted' insulating material and for deliveringthe compressed air-and the liquid adhesive will normally be located below on a floor orother suitable stand: The limits on versatility or flexibility with the present type of single chamber spray guns permits the operator to merely cut off or increase the fiow of the liquid adhesive. In order to change over from one liquid to another, it is necessary to either bring up another spray gun with dilferent connections or to clean out the one gun and the connections thereto and make new connections. Obviously, such conversions and manipulations are tedious and time-consumingand the iricreased'labor costs entailed will be justified only in a few instances. v

The object of the present invention, generally stated, is the provision of spray guns of the type described which have a plurality of liquid chambers for handling a plurality of liquids which may be sprayed either simultaneously or individually as desired from the same gun without making changes in connections.

A further.object.of the invention is the provision of such a multi-chamber spray gun whichis economical and practical to manufacture and which is easy and convenient to handle and operate from. scaffolding, in cramped. or awkward places, such as-in and around piping and conduits of various types, attics, behind machinery and other obstructions, etc.

Still another object of the invention is the provision of such a multi-chamber spray gun which can be readily taken apart for cleaning and servicing. Certain other objects of the invention will, in part be obvious and will, in part, appear hereinafter. 'For a more complete understanding of the nature and scope of the invention, reference may now be had to, the following detailed description of two illustrative 'embodiments thereof taken iii-connection with the accompanying drawings, wherein:

Fig. 1 is a top plan view, partly broken away and partly in section, ofaspray gun lying in the horizontal position an n in n e b diment f t e P nt n ntion;

Fig. 2 is an elevational view, partly in section, of the spray gun shown in Fig. l with the section being taken on line 2-2 of Fig. 1;

Fig. 3 is a front elevational view of the spray gun shown in Fig. 1;

Fig. 4 is a bracketed view showing the opposing faces of the front cover section and the rear base section of the spray gun of Fig. 1 with the intermediate separator section and gaskets being shown in edge elevation in the proper order for assembly;

Fig. 5 is an elevational view of the intermediate separator section of the spray gun of Fig. 1 which interfits between the base cover sections;

Fig. 6 is a detail sectional view taken on-line 66 of Fig. 3;

Fig. 7 is a detail sectional view taken on line 7-7 of Fig. 3;

Fig. 8 is a side elevational view of the spray gun shown in Fig. 1 taken on the opposite side from Fig. 2 with the retaining bolts being loosened so as to allow the parts to spread apart;

Fig. 9 is a plan view of a spray gun constituting the secondembodiment of the invention and built on the principle of the spray gun shown in Fig. 1;

- Fig. 10 is' a front elevational view of the spray gun shown in Fig. 9;

Fig. 11 is a fragmentary detail sectional view taken on line 11--11 of Fig. 10;

Fig. 12 is an elevational view of the inner or rear face of the front cover section of the spray gun shown in Fig. 9;

Fig. 13 is a fragmentary detail sectional view taken on line 13-43 of Fig. 12;

Fig. 14 is an elevational view of the inner or front face of the rear base section of the spray gun shown in Fig. 9;

Fig. 15 is an elevational view of the separator section interfitting between the cover and base sections of the gun of Fig. 9;

Fig. 16 is a fragmentary diagrammatic sectional view taken through a combination thermal-acoustic insulation installation installed by use of a spray gun made in accordance with the present invention; and

Fig. 17 is a diagrammatic view illustrating the manner in which the insulation of Fig. 16 is installed by use of one of the spray guns of this invention.

Referring to Figs. 1 through 8, the spray gun shown therein comprises a spray head indicated generally at 5 which fits over the end of a central pipe 6 which in turn fits telescopically in the outer end of a flexible corrugated hose or conduit 7 through which comminuted or particulate insulation material is blownby a' blast of air. In addition to being connected to the large diameter conduit 'or hose 7, the spray gun is also connected to a compressed air line 8 and two liquid supply lines 9 and 10 (Fig. 8) one of which will normally carry liquid adhesive binder.

The spray heads is made up of threesections, namely, a rear base section 11, a front cover section 12, and an intermediate separator section 13. Preferably, the separator section 13 is provided on its opposite faces with Neoprene or

composition rubber gaskets

14 and 15. The several sections are secured tightly together by four bolts 16-16 (Figs. 3-and 8) the heads of which fit in countersunk recesses in the front face of the cover section 12 with the bolt heads being provided with hex sockets so that they may be turned by means of an Allen wrench. The tour bolts 16 project through register holes provided therefor in the various sections andthe. ends of the bolts screw into threaded recesses in the base section 11. Referring to Fig. 4, the holes in the cover section 12 are indicated at17+17, and the threaded recesses in the base section ll'are indicated tit-18 18. Theholes in the intermediate section '13 are designated at 20- 20 and it 4 will be understood that there are registering holes in each of the

gaskets

14 and 15.

The spray 'head 5 is designed for simultaneously spraying two dilferent liquids onto a blast of comminuted insulating materials and particles issuing from the end of the central pipe 6. To this end, the cover section 12 carries two sets of discharge spray nozzles. The nozzles in one set are designated at 21-21 and arranged as an inner ring with the nozzles 2222 in the other set being arranged in an outer ring as viewed in Fig. 3. While in the particular embodiment shown there are six nozzles in each set and these are staggered and regularly spaced, it will be understood that there may be different numbers of nozzles in the respective sets and other spacing arrangements or patterns may be used.

Considering each of the sections of the spray head 5 in detail, the rear base section 11, as Well as the others, may be formed of metal or any other suitable material having suitable strength and the desired properties. Desirably, the various sections may be made of aluminum since this metal offers the advantages of lightness, adequate strength, corrosion resistance and it is easy to work with. The base section 11, and the other sections are ring or annular shaped and have flat faces. Referring to the bottom of Fig. 4, it will be seen that the rear section 11 is provided with two concentric chambers in the front face thereof which are designated at 23 and 24 and which take the form of annular grooves or recesses cut in the face of this section. The depth of these recesses or grooves can be seen in the sectioned portions of Figs. 1 and 2. The inner groove 23 serves as a distributing chamber or recess for one liquid material while the outer chamber or groove 24 serves as a distributing cham her for a second liquid. The section 11 is provided with arcuate enlarged portions or

sections

25 and 26 which are diametrically positioned and which serve to provide space for introducing the liquids and the compressed air into the rear section 11. The compressed air does not enter into either of the recesses or

grooves

23 or 24 but passes directly through the arcuate portion 26 by way of a hole or port 27 extending transversely therethrough. A boss (Figs. 1 and 2) 28 is provided around the rear of the port 27 and this boss is internally threaded for receiving an adapter 30 to which the flexible compressed air line 8 is connected by means of a coupling nut 31. The port 27 registers with a port 32 in the partition section 13 and this in turn opens into an arcuate distributing chamber 33 formed in the cover section 12 as shown at the top of Fig. 4.

The two liquids are introduced into the rear base section by means of suitable entrance ports in the arcuate ear or enlargement 25. Referring to Figs. 7 and 8, it will be seen that the base section 11 is provided with an integral boss 34 which is threaded for reception of an adapter or nipple 35 to which one of the liquid lines is connected by means of a coupling nut 36. The nipple 35 communicates with a port 37 in the section 11 which opens into a chamber 38 which comes in radially from the side of the section 11. The opening providing the chamber 38 is threaded for receiving a needle valve 40 which screwstherein. The pointed end of the valve member 41 fits into an inlet opening or port 42 which provides communication between the chamber 38 and the annular chamber 24. By turning the knurled thumb screw member 43 of the valve the port 42 may be com pletely closed or it may be fully or partly opened as desired.

A liquid is introduced into the inner annular chamber 23 through a similar arrangement. The section 11 is provided with a third integral boss 44 (Figs. 6 and 8) which is threaded for reception of a nipple or adapter 45 which may be connected with the second adhesive line 10' by means of a coupling nut 46. The boss opens by means of a transverse port 47 into a radially extending chamber 48 in the side of the base 11. The outer end of the chamber 48 is threaded for reception of the threaded stationary member of a needle valve '50 while the inner end of the chamber 48 merges with a port 51 which communicates with the inner annular recess or chamber 23. The end of the movable valve member is pointed as shown and is adapted to engage with the sides of the port 51 so as to either completely close this port or to open it either partially or completely depending upon the adjustment desired. The valve is adjusted by means of the knurled thumb screw head 52.

Referring to Figs. 4 and 6, it will be seen that the outer annular chamber 24 is partially blocked off by the material which is left in forming the base section 11 so as to provide for the chamber 48. This partial blocking of the outer annular chamber is indicated at 53 in Fig. 4 which designates the top wall of the chamber 48 where it passes through the outer annular chamber 24. However, there is suflicient clearance over the top of this cover portion 53 so that liquid material in the chamber 24 is uniformly distributed throughout, this clearance being indicated in Fig. 6 by the reference numeral '4. It will be understood that the passageway through the outer annular chamber 24 could take other forms, one

of which will be described below in connection with the second embodiment of the invention.

The cover section 12 has a'formation which is similar to that of the base section 11 but it ditfers therefrom in certain details. It has

concentric chambers

55 and 56 formed as annular concentric grooves or rings in the rear base of the section 12. The depth of these

chambers

55 and 56 is shown in Figs. 1 and 2, for example, as well as in Fig. 7. These chambers serve to distribute atomizing air for the liquids being sprayed as will be explained below. The compressed air from the arcuate segmentshaped chamber 33 is introduced into the outer annular chamber or recess 56 through a port opening57 formed in the partition wall or baifie 58. A needle valve 60 is provided for regulating the amount of air introduced into the outer chamber 56. The valve 60 is threaded into an opening provided in the side of the section 12 in the enlarged arcuate flange or integral portion designated at 61. The valve member 62 projects through a radial inlet opening extending in from the side of the flange 61 and terminating at the port 57. The pointed inner end of the valve member 62 is adapted to close or open the port 57 and is adjusted by means of turning the knurled thumb member 63. Compressed air passes into the radial inlet opening and around the member 62 by way of one of-two outlet openings 59--59 in the arcuate chamber 33. The'compressed air is introduced into the inner annular chamber 55 through an opening extending between the arcuate chamber 33 and the inner annular chamber 55 and formed by leaving some of the material or metal intact when the groove 56 is formed. This portion of the metal is indicated at 64 in Fig. 4 and the port or hole therethrough is indicated at 65. A second needle valve 66 'is screwed into the side of the cover section 12 and the valve member thereof is adapted to close the outer end of the port or opening 65 depending upon the adjustment thereof by means of turning the knurled thumb member 67. Compressed air passes through the second opening 59 and then flows around the valve member 68 of the valve 66.

The inner set of nozzles 21 referred to above are pressfitted into openings 69-69 (Fig. 4) in the front wall of the cover section 12 and opening rearwardly into the inner annular chamber 55. Similarly, the outer set of nozzles 22-22 are press-fitted into apertures 70-70 which register with the outer chamber 56. The openings through the nozzles inthe respective sets may be so pitched that the jets issuing therefrom tend to converge in, front of the spray head 5. j The separator section'or partition 13 is in'the form of a flat ring having enlarged arcuate portions 71 and 72. Holes or apertures are provided through the plate 13.for

6 receiving an inner set and an outer set of ducts or pipettes. The inner set of ducts is indicated in Fig. 5 at 7373 while the outer set is indicated at 74-74. Each of the ducts 73 is coaxially aligned with one of the nozzles 21 comprising the inner set of nozzles while each of the ducts 74 is coaxially aligned and in registration with one of the nozzles 22 comprising the outer set thereof. The

gaskets

14 and 15 are formed of suitable gasket material and each is provided with apertures which correspond and register with those in the partition section 13.

In order to facilitate the disassembly of the spray head 5 for cleaning or periodic inspection, it is desirable to provide the spray head with separator springs for spreading the sections apart when the draw bolts 16 are released. In line with this object, the base section 11 is provided with diametrically aligned compression springs 75 and 76 which are retained in recesses provided therefor in the opposing

flange portions

25 and 26. The

springs

75 and 76 have a length such that when compression is removed from them, they project forwardly of the front face 'of the cover section 11 as illustrated in Fig. 8 by the spring 75.

Similarly, the cover section 12 is provided with spreader springs 77 and 78 which are similarly retained and seated in diametrically aligned recesses provided therefor in the arcuate ear portions. The spreader springs 77 and 78 project rearwardly from a rear face of the cover section 12 when compression force is removed as illustrated by the spring 78 in Fig. 8. The pairs of spreader springs 7576 and 77-78 are so arranged that when the sections are assembled there will be a spring acting on the 0pposite ends of each of the enlarged

arcuate portions

25 and 26 and 59 and 61, respectively.

The spray head 5 is firmly retained over the central pipe 6 by means of a set screw 80 (Figs. 1 and 2) which extends through a tapped hole in an integral ring flange portion 81 formed on the rear side of the rear base section 11. The central apertures in each of the

sections

11, 12 and 13 is such as to accurately fit the outer diameter of the central pipe 6 so that there is no play between the spray head 5 and the pipe 6 but permitting the spray head to be readily slipped ofi therefrom when the set screw 80 is loosened.

In order to facilitate the assembly of the sections of the spray head 5 after it has been disassembled for cleaning or inspection, it has been found desirable to provide the cover section 12 with two diametrically opposed align ing pins 82 and 83 (Figs. 4 and 8). Preferably, the aligning pin 82 is somewhat larger than the aligning pin 83. These pins project'rearwardly from the arcuate ear portions 59 and 61 and. pass through registering holes provided in the intermediate section 13 and into recesses in the base section 11. The hole for the aligning pin 82 is indicated at 84 in Fig. 5 while the aperture for the smaller aligning pin 83 is indicated at 85. The recess in the base section 11 for the larger aligning pin 82 is indicated at 86 in Fig. 4 while the recess for the smaller aligning pin 83 is indicated at 87.

The operation of the spray head 5 is as follows: Assuming that comminuted or particulate insulation material is issuing in the form of a blast of dry particles from the mouth of the central pipe 6, the valves on the spray head 5 are opened and properly adjusted so that air is being introduced from the compressed air line 8 while adhesive binder of one type and another liquid, such as a fireproofing liquid, are being introduced through the lines 9 and 10, respectively. The adhesive coming in through line 9 is introduced-into the oute r annular chamber 24in the base section 11 and it is distributed aroundthis chambe'r' and continuously discharges therefrom through the outer ring or outer set 'of adhesive ducts 74-474. The liquid firepro'ofing composition may 'or may not be. simultaneously introduced through the line 10 and thence into the inner annular chamber 23 so as to be distributed other.

- from one of the sets of nozzles available.

7 therearound and pass out therefrom through the inner set of ducts 73--73.

When the adhesive is being sprayed, the air control valve 60 controlling the inlet of air into the outer annular chamber 56 of the cover section 12 is opened to the desired amount and compressed air passes fom the air line 8 through the port 27 in the base section 11, the hole 32 in the partition section 13, and the registering holes in the

gaskets

14 and 15, into the arcuate or segment air manifold chamber 33 from whence it passes under control of the valve 60 into the outer annular chamber 56. Referring to Fig. 2 and the sectional portion thereof, it will be seen that the compressed air surrounds the foreward end of each of the ducts 74 projecting therein and the compressed air and adhesive mixture pass together through the discharge nozzles 2222 with the compressed air serving to atomize the adhesive.

When the second liquid is being sprayed, the compressed air is admitted into the inner annular recess 55 in the cover section 12 under control of the valve 66. Referring to Fig. 1 it will be seen that the compressed air in this chamber 55 surrounds the projecting ends of each of the ducts 73 and atomizes the second liquid as it is discharged through the inner set of nozzles 21--21.

It will be apparent that there are a number of different ways in which the spray head may be utilized so as to take advantage of the fact that it is capable of handling two different liquids either simultaneously or at separate times. One method of operation has already been described above. That is, the simultaneous spraying of adupon which pair of registering annular recesses 2355 or 24-56 is being used. After the priming adhesive is thus applied, it being understood that the comminuted material is not being blown on at this time, the valves that are opened will'be closed and then the other set of liquid adhesive and air valves will be opened and the blast of insulating material started. Still a different method of operation of the spray head 5 would involve a situation where it is desired to put a finishing or protective coating of some sort on a layer of insulation after it has been built up. supply lines 9 or could be used to supply the surface coating material. This coating material would not be sprayed until after the insulation had been built up to the desired thickness through the use of adhesive sprayed A number of other methods of operation will be apparent and willbe illustrated below in the description of a second embodiment of applicants invention.

In Figs. 9-14 a second embodiment of applicants invention is shown in the form of a spray head indicated generally at 100 and designed to spray up to four different liquid materials simultaneously. This embodiment of the invention constitutes an extension of the embodiment described above in connection with Figs. 18. It will be understood that another embodiment of the invention could be provided having provision for spraying up to three different liquids simultaneously and if the demand should exist, other embodimentsv may be designed which will spray even more than four different liquids simultaneously.

The priming adhesive would be supplied through In that event, one of the liquid amass The spray head is constructed generally in the same way as spray head 5 was constructed. It is adapted to slip over the discharge end of a central pipe 101 which in use of the device will be connected with a flexible conduit which conveys the dry particulate insulating materials, such as comminuted asbestos. The spray head 100 includes a rear base section 102, a front cover section 103 and an intermediate partition section 104. The partition section 104 is preferably provided on the opposite faces thereof with

gaskets

105 and 106 formed of any suitable gasket material. Each of the sections of the spray head 100 is provided with a central opening permitting it to fit accurately without forcing over the end of the central pipe 101.

The rear base section 102 has four concentric annular recesses or chambers formed in the front face thereof as indicated at 107, 108, 110 and 111 in Fig. 14. These recesses are formed in the shape of grooves in the front face of the base section 102. In order to reduce the weight of the section metal is removed from the arcuate segments indicated at 112-112 around the periphery of the section 102. These arcuate recesses do not affect the functioning of the spray head.

Individual valves are provided for controlling the admission of liquid under pressure into the annular chambers in the rear base section 102, the valve for serving the innermost recess 107 being indicated at 113; that for the recess 108 at 114; that for the recess 110 at 115; and that for the outermost recess 111 and 116. Each of these valves has the same construction except for the length thereof. The valve 113 is the longest and it is shown in section in Fig. 11. An integral boss 117 is formed on the rear of the section 102 and is internally threaded for reception of an adapter 118 onto which is screwed a petcock valve 120. It will be understood that each of the

other valves

114, 115 and 116 is similarly associated with a corresponding boss 117, adapter 118, and petcock 120. The various liquid supply lines may be connected to the different valves 120.

The transverse inlet port 121 (Fig. 11) for each of the valves opens into a radially extending tubular member 122, the outer end of which projects outside of the side wall or outer periphery of the section 102 and the inner end of which opens into theparticular annular recess or chamber to be served in the case of the tube 122 in Fig. 11, this being the innermost annular chamber 107. The corresponding radial tube 123 of the valve 114 projects inwardly so as to open into the annular chamber 108; the tube 124 for the valve 115 opens into the annular chamber 110, and the tube 125 for the valve 168 is shortest and opens into the outermost annular recess 111. The valve 113 is provided with a needle valve member 126, the inner end of which is pointed and the outer end of which is provided with a knurled thumb head 127. The inner end of the tube 122 is provided with an end wall or plug 128 which is apertured and which may be completely closed or partly or fully opened depending upon the position of the needle member 126. It will be understood that each of the

other valves

114, 115 and 116 is similarly provided with a valve stem and knurled thumb head.

The base section 122 is provided on the opposite side thereof from the valves 113-116 with a transverse compressed air passage 130 (Fig. 14) provided on the rear side with an integral boss 131 (Fig. 9) which in internally threaded so as to receive a compressed air control petcock 132. The compressed air line to the spray head 100 is connected to this petcock 132.

In order to secure the spray head 100 in fixed position on the central pipe 101 the rear section 102 is provided with an integral boss or circumferential flange 132 (Fig. 9) which is provided with a set screw 134.

The cover section 103 is formed similarly to the cover section 12 of the spray head 5. It takes the formof a flat annular member, the rear base of which is provided .at 161 in Fig. 11.

with four concentric

annular recesses

135, 136, 137 and 138. These recesses register with the corresponding recesses in the rear base section 102. In order to reduce weight the cover section 103 is also provided with three circumferential arcuate recesses 140-140 wherein metal has been removed to decrease the weight. A third arcuate recess 141 serves as a manifold chamber for distributing air pressure to the four valves which control admission of the compressed air to the four respective recesses in the cover section 103. The valve for admitting and ,controlling the compressed air into the outer annular recess 138 is indicated at 142; that for the chamber 137 is indicated at 143; that for the chamber 136 is indicated at 144; and that for the inner chamber 135 is indicated at 145. Fig. 13 is a detailed sectional view through the compressed air control valve 143, it being understood that the other three air control valves are of similar construction, the diiference lying in the lengths thereof. The valve 143 includes a tube 146 which extends radially in from the side of the section 103 and opens into the annular recess 136. A valve stem 147 which is pointed at the inner end extends through the tube 146 and is provided on its outer end with a knurled thumb head 148. The end of the valve stem 147 closes or partially opens or completely opens an air outlet port 150 through the inner end of the tube 146 depending upon the adjustment thereof.

The floor of the arcuate manifold 141 is provided with four apertures 151-151 each of which opens into the underlying tube 146 for admission of air thereinto. When one of the valves is opened the air comes in through the respective port 151 and then flows inwardly around the valve stem and out through the valve port in the inner end of the tube member 147.

Referring to Fig. it will be seen that the spray head 100 is provided with four concentric sets of spray nozzles. The nozzles in the innermost set are indicated at 152-152; those in the next set are indicated at 153- 153; those in the next set are indicated at 154-154; and those in the outer set are indicated at 155-155. There are six nozzles in each set and the nozzles in adjacent sets are staggered with respect to each other. It will, of course, be understood that there may be a diiferent number of nozzles in the sets and one set may have a different number of nozzles from the other. Furthermore, it will be understood that the disposition or pattern of the nozzles may vary.

Referring to Fig. 12 it will be seen that the respective concentric annular recesses in the cover section 103 are provided with apertures or openings for reception of the ,nozzles; The openings in the inner chamber 135 are designated at 156-156; those in the chamber 136 are designated at 157-157; those in the chamber 137 are designated at 158-158; those in the outer chamber 138 are designated at 160-160. The nozzles are frictionfitted into these openings from the front face of the section 103. The intermediate separator or partition secducts which is in the inner set of apertures is indicated It will be understood that the other ducts are similarly aligned and description thereof is not plate, or separator section 104."

The sections of the spray head 100 are secured together 'by means of four draw bolts 162-162 (Fig. 10)' the heads of which are countersunk into recesses in the base of the cover section 103. The apertures in the cover section 103 for the bolts are indicated at 163-163 in uids.

Fig. 12. The apertures in the separator section 104 are indicated at 164-164. The air transmitting aperture in the section 104 is designated at 165, this aperture registering with the transverse air passage in the base section 102.

The base section 102 is provided with four tapped bolt end receiving recesses designated at 166-166. in order to facilitate the re-assembly of the sections comprising the spray head 100, the cover section 103 is provided with two rearwardly extending aligning pins 167 and 168 (Fig. 12). These aligning pins are diametrically spaced and the pin 167 is somewhat larger than the pin 168. The partition section 104 is provided with an aperture 170 for the larger aligning pin 167 and a smaller aperture 171 for the smaller aligning pin 168. Similarly, the rear base section is provided with recesses for receiving the ends of the aligning pins, the recess for the larger aligning pin being indicated at 172 and that for the smaller pin being indicated at 173.

In order to facilitate the separation of the sections for cleaning and inspection, four spreader springs are provided, two being carried by the cover section 103 and two being carried by the base section 102. The springs in the base section are indicated at 174 and 1.75, while those in the cover section are indicated at176 and 177. It will be seen that the

springs

174 and 175 are compressed against one side of the partition section 104, while the other pair of springs 176 and 177 are compressed against'the opposite side thereof. Accordingly, when the bolts 162 are released these springs serve to expand and to separate the sections as described above in connection with the spray head 5.

The operation of the spray head 100 is similar to that of the spray head 5. For example, when the valve 116 into the outer annular recess 111 of the base section 102 is opened so as to admit liquid material therethrough, e. g. adhesive, the adhesive or liquid flowsinto this annular recess and is distributed circumferentially therearound. It flows out under pressure through the communicating ducts carried by the partition section 104 and is delivered in the form of streams into the back sides of the outer series of nozzles 155-155. At the same time compressed air is admitted to the outer annular recess 138 in the cover section 103 by opening the associated control valve 142. The compressed air is distributed around this annular recess and atomizes the liquid as it is discharged through the outer set of nozzles. Liquid is distributed through the other three sets of nozzles and the corresponding annular recesses or passageways in the

sections

102 and 103 in like manner.

. One method of using the spray head 100 will now be described in connection with Figs. 16 and 17. Referring to these figures the reference character 180 designates a corrugated metal wall or ceiling member, such as is found in Quonset huts, for example. This corrugated metal wall or ceiling member 180 is to be first primed with a primer coating 181 and then it is to receive a layer of substantial thickness, e. g. one-half inch, of thermal insulation 182. This layer of insulation is to be sealed with the same material that was used to prime the metal 180 and this sealing coating is indicated at 183. Thereafter, a mat or blanket of acoustical insulation 184 is built up to a suitable thickness, e. g. one-half inch. The acoustical layer 184 is to be finished with a finish coating 185. This decorative coating or outer coating may, for example, take the form of aluminum paint or any other finish material. In order to obtain a fireproof construction, it is desired to spray liquid fireproofing -material with the adhesive when the insulating layers 182' and 184 are built up. Ac-

cordingly, it will be 'seen that in putting on this complete insulation it will be necessary to spray four different liq- First of all, there will be the primer and sealing liquid; then the adhesive binder for the insulating materials and the fireproofing liquid which are sprayed together; and finally the finish coating composition 185.

In preparing for making such an installation the operator connects the air valve 132 to the compressed air line and then connects each of the four liquid valves 120120 to the four lines which supply the four different liquids mentioned. The central pipe 101 is connected to the flexible conduit through which the dry comminuted insulating materials are delivered. Referring now to Fig. 17, the operator first turns on the liquid valves for admitting the primer liquid to the spray head 100 and he turns on the air control valve which delivers air to the particular set of nozzles registering with the annular chamber which receives this primer liquid. The other valves remain turned off. The insulating material is not yet being supplied through the central pipe 101 and the operator now proceeds to spray the primer liquid to build up the primer coat 181. He will apply this over a substantial area which will be as large as he can conveniently cover if he happens to be upon a scaffold and he turns off the valve admitting the primer liquid and opens the two valves which admit the adhesive binder, e. g. asphalt emulsion, while admitting the fireproofing material. At the same time the blast of insulating material is started and the operator proceeds to build up the thermal insulating layer 182 to the desired thickness with the particles of insulation being coated both by the asphalt binder and by the liquid fireproofing composition. After this layer 182 has been built up to dimension, these two liquid control valves are closed and the first control valve is opened so as to apply the sealer coat 183 to the thermal insulating layer 182. After this has been applied, the appropriate valve is again closed and the two other liquid valves are opened which supply the liquid adhesive and the liquid fireproofing material. The operator now continues to spray until he builds up the acoustical insulating layer 184, it being understood that the dry comminuted material for this layer may be different from that for the thermal insulation layer and also the amount of adhesive binder used will ordinarily be reduced so as to obtain greater porosity in this acoustical insulating layer. After this layer 184 is built up, the two liquid valves which have been used are closed and the fourth liquid valve is opened and the associated air control valve is opened while the other valves are closed. The operator then proceeds to apply the finishing coating 185.

It will be understood that various other types of spraying may be handled by the spray head 100 allowing an operator to make full and most etficient use of his time without interruptions for switching to other guns or changing over the liquid connections.

Since certain changes and modifications can be made in the embodiments of the invention described above and additional embodiments of the invention may be constructed without departing from the spirit and scope of the invention, it will be understood that all matter described above and shown in the accompanying drawings is to be interpreted as illustrative and not in a limited sense.

What is claimed as new is:

1. A spray head for spraying a plurality of materials from a plurality of sets of nozzles, comprising, a rear base section having at least two concentric annular chambers in the front face thereof, inlet ports in said rear section communicating with said chambers, a front cover section having concentric annular chambers in the rear face thereof and each of which registers with one of said chambers in said rear base section, inlet ports in said cover section communicating with said chambers therein, a separator disposed between said base and cover sections so as to close off and separate said chambers in said base section from those in said cover section, and means securing said rear basesection, cover section and separator together in fluid-tight relationship, said cover section having a plurality of sets of discharge nozzle openings arranged around the front face thereof with the openings in each set communicating with one of said annular chambers therein, and said separator providing a plurality of sets of communicating passageways communicating between said registering annular chambers in said cover and base sections and each of said communicating passageways being coaxially aligned with one of said nozzle openings.

2. A spray' head adapted for use on a gun for blowing particulate insulation material onto a surface and simultaneously sprayinga plurality of materials onto the blast of insulation material as it discharges from the gun, said gun having a relatively large central pipe through which the insulation" material is blown and over the discharge end of which said spray head fits, and said spray head comprising: a rear base section having a transverse central opening therein shaped to receive said central pipe of the gun and having a flat front face in which there are at least two concentric annular chambers extending around said central openings, inlet ports in said rear section communicating with said annular chambers; a front cover section having a central opening therein shaped to receive said central pipe of the gun and having a flat rear face wherein there are concentric annular chambers each of which registers with one of said chambers in said rear base section, inlet ports in said cover section communicating with said chambers therein, an intermediate separator section disposed between the fiat mating faces of said rear and cover sections so as to close off, and separate the chambers therein, and means for securing said rear, cover and separator sections together in fluidtight relationship, said cover section having a plurality of sets of discharge nozzle openings arranged around the front face thereof with the openings in each set communicating with one of said annular chambers therein, and said intermediate separator section providing a plurality of sets of communicating passageways communicating between said registering annular chambers in said cover and base sections and each of said communicating passageways being coaXially aligned with one of said nozzle openings.

3. A spray head for spraying a plurality of materials from a plurality of sets of nozzles, comprising, a rear base section having at least two concentric annular chambers formed as grooves in the front face thereof, inlet ports in said rear section communicating with said chambers, a front cover section having concentric annular chambers formed as grooves in the rear face thereof and each of which registers with one of said chambers in said rear base section, inlet ports in said cover section communicating with said chambers therein, an intermediate separator section disposed between said base and cover sections so as to close off and separate said chambers in said base section from those in said cover section, means for securing said base, cover and separator sections together in fluid-tight relationship, a plurality of sets of nozzles mounted in the front face of said cover section with the nozzles in each set communicating with one of said annular chambers in said cover section, and a plurality of sets of tubes extending transversely therethrough with the rear ends of the tubes in each set opening into one of said annular chambers in said base section while the front ends of the tubes open into the registering annular chamber in the cover section, and each tube being coaxially aligned with one of said nozzles.

4. A spray head for pneumatically spraying a plurality of liquids from a plurality of sets of nozzles, comprising, a rear base section having at least two concentric annular liquid chambers formed as grooves in the front face thereof, individual liquid inlet ports in said rear base section communicating with each of said liquid chambers, a front cover section having concentric annularair chambers formed as grooves in the rear face thereof each of which registers with one of said liquid chambers, an arcuate air pressure distributor groove formed in the rear face of said cover section having an iniet port leading therein and having outlet ports leading therefrom individually into each of said annular air chambers, an intermediate separator section disposed between said base and cover sections so as to close off and separate said liquid chambers in said base section from said air chambers in said cover section, and means for securing said base, cover and separator sections together in fluid-tight relationship, said cover section having a plurality of sets of spray discharge nozzles arranged around the front face thereof with the nozzles in each set communicating with one of said annular air chambers, and said intermediate separator section having a plurality of sets of passageways therein communicating between said registering annular air and liquid chambers in said cover and base sections and each passageway being coaxially aligned with one of said nozzles.

5. A spray head for use on a gun for blowing particulate insulation material onto a surface and simultaneously pneumatically spraying a plurality of liquids onto the blast of insulation material as it discharges from the gun,

' said gun having a relatively large central pipe through which the insulation material is blown and over the discharge end of which said spray head fits, and said spray head comprising: an annular rear base section having a transverse central opening therein shaped to receive said central pipe of the gun and having a flat front face in which there are at least two concentric annular liquid chambers formed as grooves in the front face thereof, liquid inlet passageways provided in said rear base section extending radially into each of said chambers from the side of said section and a compressed air port extending transversely completely through said rear section adjacent the outer edge thereof, a regulatable valve pr0- vided for each of said liquid inlet passageways; a front cover section having a transverse central opening therein shaped to receive said central pipe and having a flat rear face in which there are concentric annular compressed air chambers each of which registers with one of said annular liquid chambers in said rear base section, an arcuate compressed air manifold groove formed in the rear or inner face of said cover section outwardly of the outermost annular chamber therein and having a portion thereof in registration with said compressed air port in said base section, radial passageways extending from the side wall of said cover section into each of said annular compressed air chambers, a valve for each of said radial passageways provided with a valve stem extending therein, transverse passageways communicating between each of said radial passageways and said arcuate manifold groove, a plurality of sets of nozzles mounted in openings provided therefor in the front side of said cover section, said sets of nozzles being arranged in concentric circles with each of said nozzles opening rearwardly into one of said annular compressed air chambers, an intermediate separator section disposed between said base and cover sections having an opening therein that registers with said compressed air port in said base section and having concentric ring openings therein with each of these openings registering with one of said nozzles in said cover section, a tube in each of said concentrically arranged openings in said separator section coaxially aligned with one of said nozzles and having one end projecting rearwardly into one of said annular liquid chambers in said base section with the other end projecting into one of said annular compressed air chambers in said cover section, and means for securing said base, cover and separator sections together in fluid-tight relationship.

References Cited in the file of this patent UNITED STATES PATENTS